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// or

<span class="token function">yarn</span> <span class="token function">add</span> @better-scroll/zoom
</code></pre></div><h2 id="usage"><a href="#usage" class="header-anchor">#</a> Usage</h2> <p>import <code>zoom</code>, then call <code>BScroll.use()</code>.</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">import</span> BScroll <span class="token keyword">from</span> <span class="token string">'@better-scroll/core'</span>
<span class="token keyword">import</span> Zoom <span class="token keyword">from</span> <span class="token string">'@better-scroll/zoom'</span>

BScroll<span class="token punctuation">.</span><span class="token function">use</span><span class="token punctuation">(</span>Zoom<span class="token punctuation">)</span>
</code></pre></div><p>pass in the correct configuration in options, for example:</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">new</span> <span class="token class-name">BScroll</span><span class="token punctuation">(</span><span class="token string">'.bs-wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
  <span class="token literal-property property">freeScroll</span><span class="token operator">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span>
  <span class="token literal-property property">scrollX</span><span class="token operator">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span>
  <span class="token literal-property property">scrollY</span><span class="token operator">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span>
  <span class="token literal-property property">zoom</span><span class="token operator">:</span> <span class="token punctuation">{</span>
    <span class="token literal-property property">start</span><span class="token operator">:</span> <span class="token number">1</span><span class="token punctuation">,</span>
    <span class="token literal-property property">min</span><span class="token operator">:</span> <span class="token number">0.5</span><span class="token punctuation">,</span>
    <span class="token literal-property property">max</span><span class="token operator">:</span> <span class="token number">2</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre></div><p>The following is related to <code>zoom</code> plugin and <a href="/docs/en-US/guide/base-scroll-options.html">BetterScroll configuration</a>:</p> <ul><li><p><strong>zoom(for plugin)</strong></p> <p>Enable zoom functionality. That is to say, the zoom plugin won't work without the zoom option, see <a href="/docs/en-US/plugins/zoom.html#option">zoom option</a>.</p></li> <li><p><strong>freeScroll</strong></p> <p>If you want to scroll in x and y axies after zooming in, the <strong>freeScroll</strong> value should be set to <code>true</code>. In addtional, <strong>scrollX</strong> and <strong>scrollY</strong> are also need to be true.</p></li> <li><p><strong>scrollX</strong></p> <p><code>true</code> is be required if you want to scroll in x axies after zooming in.</p></li> <li><p><strong>scrollY</strong></p> <p><code>true</code> is be required if you want to scroll in y axies after zooming in.</p></li></ul> <h2 id="demo"><a href="#demo" class="header-anchor">#</a> Demo</h2> <div class="custom-block warning"><p class="custom-block-title">WARNING</p> <p>pc is not allowed, scan the qrcode.</p></div> <div class="demo-wrap"><div class="demo-nav"><i class="demo-nav-btn icon-code"><svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke="#000"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="3" d="M10 20l4-16m4 4l4 4-4 4M6 16l-4-4 4-4"></path></svg></i> <div class="v-popover"><div class="trigger" style="display:inline-block;"><i class="demo-nav-btn icon-qrcode"><svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke="#666"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 4v1m6 11h2m-6 0h-2v4m0-11v3m0 0h.01M12 12h4.01M16 20h4M4 12h4m12 0h.01M5 8h2a1 1 0 001-1V5a1 1 0 00-1-1H5a1 1 0 00-1 1v2a1 1 0 001 1zm12 0h2a1 1 0 001-1V5a1 1 0 00-1-1h-2a1 1 0 00-1 1v2a1 1 0 001 1zM5 20h2a1 1 0 001-1v-2a1 1 0 00-1-1H5a1 1 0 00-1 1v2a1 1 0 001 1z"></path></svg></i> </div> <div id="popover_3180t7j39b" aria-hidden="true" tabindex="0" class="tooltip popover vue-popover-theme" style="visibility:hidden;"><div class="wrapper"><div class="tooltip-inner popover-inner" style="position:relative;"><div><div></div></div> <div tabindex="-1" class="resize-observer" data-v-8859cc6c></div></div> <div class="tooltip-arrow popover-arrow"></div></div></div></div> <i class="demo-nav-btn icon-preview"><svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke="#666"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9.75 17L9 20l-1 1h8l-1-1-.75-3M3 13h18M5 17h14a2 2 0 002-2V5a2 2 0 00-2-2H5a2 2 0 00-2 2v10a2 2 0 002 2z"></path></svg></i></div> <div class="demo-code" style="display:;"><div class="demo-code-nav"><button class="demo-code-btn active">Template</button><button class="demo-code-btn">Script</button><button class="demo-code-btn">Style</button></div> <div class="demo-code-content"><div class="demo-code-item" style="display:;"><div class="language-vue extra-class"><pre class="language-vue"><code><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>template</span><span class="token punctuation">&gt;</span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>zoom-default<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>zoom-wrapper<span class="token punctuation">&quot;</span></span> <span class="token attr-name">ref</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>zoom<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
      <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>zoom-items<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>grid-item<span class="token punctuation">&quot;</span></span> <span class="token attr-name">v-for</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>num in nums<span class="token punctuation">&quot;</span></span> <span class="token attr-name">:key</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>num<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>{{num}}<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span>
      <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>btn-wrap<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
      <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>button</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>zoom-half<span class="token punctuation">&quot;</span></span> <span class="token attr-name">@click</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>zoomTo(0.5)<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>zoomTo:0.5<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>button</span><span class="token punctuation">&gt;</span></span>
      <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>button</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>zoom-original<span class="token punctuation">&quot;</span></span> <span class="token attr-name">@click</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>zoomTo(1)<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>zoomTo:1<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>button</span><span class="token punctuation">&gt;</span></span>
      <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>button</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>zoom-double<span class="token punctuation">&quot;</span></span> <span class="token attr-name">@click</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>zoomTo(2)<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>zoomTo:2<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>button</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>linkwork-wrap<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
      <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>p</span><span class="token punctuation">&gt;</span></span>changing with zooming action<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>p</span><span class="token punctuation">&gt;</span></span>
      <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>linkwork-block<span class="token punctuation">&quot;</span></span> <span class="token attr-name">:style</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>{transform: linkworkTransform}<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>template</span><span class="token punctuation">&gt;</span></span></code></pre></div></div><div class="demo-code-item" style="display:none;"><div class="language-vue extra-class"><pre class="language-vue"><code><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>script</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>text/ecmascript-6<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span><span class="token script"><span class="token language-javascript">
  <span class="token keyword">import</span> BScroll <span class="token keyword">from</span> <span class="token string">'@better-scroll/core'</span>
  <span class="token keyword">import</span> Zoom <span class="token keyword">from</span> <span class="token string">'@better-scroll/zoom'</span>

  BScroll<span class="token punctuation">.</span><span class="token function">use</span><span class="token punctuation">(</span>Zoom<span class="token punctuation">)</span>

  <span class="token keyword">const</span> <span class="token constant">COMPONENT_NAME</span> <span class="token operator">=</span> <span class="token string">'zoom'</span>

  <span class="token keyword">export</span> <span class="token keyword">default</span> <span class="token punctuation">{</span>
    <span class="token literal-property property">name</span><span class="token operator">:</span> <span class="token constant">COMPONENT_NAME</span><span class="token punctuation">,</span>
    <span class="token function">data</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token keyword">return</span> <span class="token punctuation">{</span>
        <span class="token literal-property property">nums</span><span class="token operator">:</span> <span class="token number">16</span><span class="token punctuation">,</span>
        <span class="token literal-property property">linkworkTransform</span><span class="token operator">:</span> <span class="token string">'scale(1)'</span>
      <span class="token punctuation">}</span>
    <span class="token punctuation">}</span><span class="token punctuation">,</span>
    <span class="token function">mounted</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">init</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">,</span>
    <span class="token literal-property property">methods</span><span class="token operator">:</span> <span class="token punctuation">{</span>
      <span class="token function">init</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>zoom <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BScroll</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>$refs<span class="token punctuation">.</span>zoom<span class="token punctuation">,</span> <span class="token punctuation">{</span>
          <span class="token literal-property property">freeScroll</span><span class="token operator">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span>
          <span class="token literal-property property">scrollX</span><span class="token operator">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span>
          <span class="token literal-property property">scrollY</span><span class="token operator">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span>
          <span class="token literal-property property">disableMouse</span><span class="token operator">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span>
          <span class="token literal-property property">useTransition</span><span class="token operator">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span>
          <span class="token literal-property property">zoom</span><span class="token operator">:</span> <span class="token punctuation">{</span>
            <span class="token literal-property property">start</span><span class="token operator">:</span> <span class="token number">1.5</span><span class="token punctuation">,</span>
            <span class="token literal-property property">min</span><span class="token operator">:</span> <span class="token number">0.5</span><span class="token punctuation">,</span>
            <span class="token literal-property property">max</span><span class="token operator">:</span> <span class="token number">3</span><span class="token punctuation">,</span>
            <span class="token literal-property property">initialOrigin</span><span class="token operator">:</span> <span class="token punctuation">[</span><span class="token string">'center'</span><span class="token punctuation">,</span> <span class="token string">'center'</span><span class="token punctuation">]</span>
          <span class="token punctuation">}</span>
        <span class="token punctuation">}</span><span class="token punctuation">)</span>

        <span class="token keyword">this</span><span class="token punctuation">.</span>zoom<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'zooming'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token parameter"><span class="token punctuation">{</span> scale <span class="token punctuation">}</span></span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
          <span class="token keyword">this</span><span class="token punctuation">.</span>linkworkTransform <span class="token operator">=</span> <span class="token template-string"><span class="token template-punctuation string">`</span><span class="token string">scale(</span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>scale<span class="token interpolation-punctuation punctuation">}</span></span><span class="token string">)</span><span class="token template-punctuation string">`</span></span>
        <span class="token punctuation">}</span><span class="token punctuation">)</span>

        <span class="token keyword">this</span><span class="token punctuation">.</span>zoom<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'zoomEnd'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token parameter"><span class="token punctuation">{</span> scale <span class="token punctuation">}</span></span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
          console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>scale<span class="token punctuation">)</span>
        <span class="token punctuation">}</span><span class="token punctuation">)</span>
      <span class="token punctuation">}</span><span class="token punctuation">,</span>
      <span class="token function">zoomTo</span><span class="token punctuation">(</span><span class="token parameter">value</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>zoom<span class="token punctuation">.</span><span class="token function">zoomTo</span><span class="token punctuation">(</span>value<span class="token punctuation">,</span> <span class="token string">'center'</span><span class="token punctuation">,</span> <span class="token string">'center'</span><span class="token punctuation">)</span>
      <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>
  <span class="token punctuation">}</span>
</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>script</span><span class="token punctuation">&gt;</span></span></code></pre></div></div><div class="demo-code-item" style="display:none;"><div class="language-styl extra-class"><pre class="language-styl"><code>&lt;style lang=<span class="token string">&quot;stylus&quot;</span> rel=<span class="token string">&quot;stylesheet/stylus&quot;</span>&gt;

<span class="token selector">.zoom-default</span>
  <span class="token selector">.zoom-wrapper</span>
    <span class="token property-declaration"><span class="token property">width</span> <span class="token number">100</span><span class="token unit">%</span></span>
    <span class="token property-declaration"><span class="token property">overflow</span> hidden</span>
    <span class="token selector">.zoom-items</span>
      <span class="token property-declaration"><span class="token property">display</span> flex</span>
      <span class="token property-declaration"><span class="token property">flex-direction</span> row</span>
      <span class="token property-declaration"><span class="token property">flex-wrap</span> wrap</span>
      <span class="token property-declaration"><span class="token property">align-content</span> space-between</span>
      <span class="token selector">.grid-item</span>
        <span class="token property-declaration"><span class="token property">flex</span> <span class="token number">1</span> <span class="token number">1</span> <span class="token number">25</span><span class="token unit">%</span></span>
        <span class="token property-declaration"><span class="token property">box-sizing</span> border-box</span>
        <span class="token property-declaration"><span class="token property">height</span> <span class="token number">52</span><span class="token unit">px</span></span>
        <span class="token property-declaration"><span class="token property">line-height</span> <span class="token number">52</span><span class="token unit">px</span></span>
        <span class="token property-declaration"><span class="token property">border</span> <span class="token number">1</span><span class="token unit">px</span> solid <span class="token hexcode">#eee</span></span>
        <span class="token property-declaration"><span class="token property">text-align</span> center</span>
        <span class="token selector">&amp;:nth-child(2n)</span>
          <span class="token property-declaration"><span class="token property">background-color</span> <span class="token hexcode">#b3d4a8</span></span>
        <span class="token selector">&amp;:nth-child(2n+1)</span>
          <span class="token property-declaration"><span class="token property">background-color</span> <span class="token hexcode">#b6b7a3</span></span>
  <span class="token selector">.btn-wrap</span>
    <span class="token property-declaration"><span class="token property">margin-top</span> <span class="token number">20</span><span class="token unit">px</span></span>
    <span class="token property-declaration"><span class="token property">display</span> flex</span>
    <span class="token property-declaration"><span class="token property">justify-content</span> center</span>
    <span class="token selector">button</span>
      <span class="token property-declaration"><span class="token property">margin</span> <span class="token number">0</span> <span class="token number">10</span><span class="token unit">px</span></span>
      <span class="token property-declaration"><span class="token property">padding</span> <span class="token number">10</span><span class="token unit">px</span></span>
      <span class="token property-declaration"><span class="token property">color</span> <span class="token hexcode">#fff</span></span>
      <span class="token property-declaration"><span class="token property">border-radius</span> <span class="token number">4</span><span class="token unit">px</span></span>
      <span class="token property-declaration"><span class="token property">background-color</span> <span class="token hexcode">#666</span></span>
  <span class="token selector">.linkwork-wrap</span>
    <span class="token property-declaration"><span class="token property">margin-top</span> <span class="token number">50</span><span class="token unit">px</span></span>
    <span class="token selector">p</span>
      <span class="token property-declaration"><span class="token property">margin</span> <span class="token number">10</span><span class="token unit">px</span> <span class="token number">0</span></span>
      <span class="token property-declaration"><span class="token property">font-size</span> <span class="token number">16</span><span class="token unit">px</span></span>
      <span class="token property-declaration"><span class="token property">font-weight</span> bold</span>
      <span class="token property-declaration"><span class="token property">text-align</span> center</span>
  <span class="token selector">.linkwork-block</span>
    <span class="token property-declaration"><span class="token property">margin</span> <span class="token number">10</span><span class="token unit">px</span> auto</span>
    <span class="token property-declaration"><span class="token property">width</span> <span class="token number">60</span><span class="token unit">px</span></span>
    <span class="token property-declaration"><span class="token property">height</span> <span class="token number">60</span><span class="token unit">px</span></span>
    <span class="token property-declaration"><span class="token property">border-radius</span> <span class="token number">50</span><span class="token unit">%</span></span>
    <span class="token property-declaration"><span class="token property">background-image</span> <span class="token url">url(&quot;./good.svg&quot;)</span></span>
    <span class="token property-declaration"><span class="token property">background-size</span> <span class="token number">100</span><span class="token unit">%</span></span>
&lt;/style&gt;</code></pre></div></div> <i class="demo-code-content-copy"><svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke="#ccc"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M8 5H6a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2v-1M8 5a2 2 0 002 2h2a2 2 0 002-2M8 5a2 2 0 012-2h2a2 2 0 012 2m0 0h2a2 2 0 012 2v3m2 4H10m0 0l3-3m-3 3l3 3"></path></svg></i> <!----></div></div> <div class="demo-main"><div class="demo-component-wrap"></div></div></div> <h2 id="option"><a href="#option" class="header-anchor">#</a> Option</h2> <h3 id="start"><a href="#start" class="header-anchor">#</a> start</h3> <ul><li><p><strong>Type</strong>: <code>number</code></p></li> <li><p><strong>Default</strong>: <code>1</code></p> <p>Initial scale.</p></li></ul> <h3 id="min"><a href="#min" class="header-anchor">#</a> min</h3> <ul><li><p><strong>Type</strong>: <code>number</code></p></li> <li><p><strong>Default</strong>: <code>1</code></p> <p>min scale.</p></li></ul> <h3 id="max"><a href="#max" class="header-anchor">#</a> max</h3> <ul><li><p><strong>Type</strong>: <code>number</code></p></li> <li><p><strong>Default</strong>: <code>4</code></p> <p>max scale.</p></li></ul> <h3 id="initialorigin"><a href="#initialorigin" class="header-anchor">#</a> initialOrigin</h3> <ul><li><p><strong>Type</strong>: <code>[OriginX, OriginY]</code></p> <ul><li><strong>OriginX</strong>: <code>number | 'left' | 'right' | 'center'</code></li> <li><strong>OriginY</strong>: <code>number | 'top' | 'bottom' | 'center'</code></li></ul></li> <li><p><strong>Default</strong>: <code>[0, 0]</code></p> <p>The origin of first initializing zoom instance, It is valid when <code>start</code> is not <code>1</code>.The origin is all based on the coordinate system of <code>scaled element</code>.</p></li> <li><p><strong>Examples</strong></p></li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  <span class="token keyword">new</span> <span class="token class-name">BScroll</span><span class="token punctuation">(</span><span class="token string">'.bs-wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
    <span class="token comment">// ... other configuration</span>
    <span class="token literal-property property">zoom</span><span class="token operator">:</span> <span class="token punctuation">{</span>
      <span class="token literal-property property">initialOrigin</span><span class="token operator">:</span> <span class="token punctuation">[</span><span class="token number">50</span><span class="token punctuation">,</span> <span class="token number">50</span><span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token comment">// Based on 'scaled element', offsetLeft is 50px, offsetRight is 50px</span>
      <span class="token literal-property property">initialOrigin</span><span class="token operator">:</span> <span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token comment">// Based on 'scaled element', the left vertex</span>
      <span class="token literal-property property">initialOrigin</span><span class="token operator">:</span> <span class="token punctuation">[</span><span class="token string">'left'</span><span class="token punctuation">,</span> <span class="token string">'top'</span><span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token comment">// same as above</span>
      <span class="token literal-property property">initialOrigin</span><span class="token operator">:</span> <span class="token punctuation">[</span><span class="token string">'center'</span><span class="token punctuation">,</span> <span class="token string">'center'</span><span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token comment">// Based on 'scaled element', center position</span>
      <span class="token literal-property property">initialOrigin</span><span class="token operator">:</span> <span class="token punctuation">[</span><span class="token string">'right'</span><span class="token punctuation">,</span> <span class="token string">'top'</span><span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token comment">// Based on 'scaled element', the right vertex</span>
    <span class="token punctuation">}</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre></div><p>When you initialize zoom, you usually focus on zooming with the endpoint or center. You can refer to the above example.</p> <h3 id="minimalzoomdistance"><a href="#minimalzoomdistance" class="header-anchor">#</a> minimalZoomDistance</h3> <ul><li><p><strong>Type</strong>: <code>number</code></p></li> <li><p><strong>Default</strong>: <code>5</code></p> <p>When you zoom with two fingers, only when the zoom distance exceeds <code>minimalZoomDistance</code>, the zoom will take effect.</p></li></ul> <h3 id="bouncetime"><a href="#bouncetime" class="header-anchor">#</a> bounceTime</h3> <ul><li><p><strong>Type</strong>: <code>number</code></p></li> <li><p><strong>Default</strong>: <code>800</code>(ms)</p> <p>When the two fingers continue to zoom and the scale exceeds the threshold of <code>max</code>, when the two fingers leave, the internal &quot;bounce&quot; to the form of <code>max</code>, and <code>bounceTime</code> is the animation of this &quot;bounce&quot; behavior duration.</p></li></ul> <div class="custom-block tip"><p class="custom-block-title">TIP</p> <p>When <code>zoom</code> is configured as <code>true</code>, the plugin uses the default plugin option.</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">const</span> bs <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BScroll</span><span class="token punctuation">(</span><span class="token string">'.wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
  <span class="token literal-property property">zoom</span><span class="token operator">:</span> <span class="token boolean">true</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>

<span class="token comment">// equals</span>

<span class="token keyword">const</span> bs <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BScroll</span><span class="token punctuation">(</span><span class="token string">'.wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
  <span class="token literal-property property">zoom</span><span class="token operator">:</span> <span class="token punctuation">{</span>
    <span class="token literal-property property">start</span><span class="token operator">:</span> <span class="token number">1</span><span class="token punctuation">,</span>
    <span class="token literal-property property">min</span><span class="token operator">:</span> <span class="token number">1</span><span class="token punctuation">,</span>
    <span class="token literal-property property">max</span><span class="token operator">:</span> <span class="token number">4</span><span class="token punctuation">,</span>
    <span class="token literal-property property">initialOrigin</span><span class="token operator">:</span> <span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
    <span class="token literal-property property">minimalZoomDistance</span><span class="token operator">:</span> <span class="token number">5</span><span class="token punctuation">,</span>
    <span class="token literal-property property">bounceTime</span><span class="token operator">:</span> <span class="token number">800</span><span class="token punctuation">,</span> <span class="token comment">// ms</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre></div></div> <h2 id="instance-methods"><a href="#instance-methods" class="header-anchor">#</a> Instance Methods</h2> <h3 id="zoomto-scale-x-y-bouncetime"><a href="#zoomto-scale-x-y-bouncetime" class="header-anchor">#</a> zoomTo(scale, x, y, [bounceTime])</h3> <ul><li><p><strong>Arguments</strong></p> <ul><li><code>{number} scale</code>: scale ratio</li> <li><code>{OriginX} x</code>: The x of origin that is based on the left vertex of the <strong>scaled element</strong> <ul><li><code>OriginX: 'number | 'left' | 'right' | 'center'</code></li></ul></li> <li><code>{OriginY} y</code>:  The y of origin that is based on the left vertex of the <strong>scaled element</strong> <ul><li><code>OriginY: 'number | 'top' | 'bottom' | 'center'</code></li></ul></li> <li><code>{number} [bounceTime]&lt;Optional&gt;: Animation duration of a zoom action</code></li></ul> <p>Scale the element with <code>[x, y]</code> as the coordinate origin. x and y can be not only <code>number</code>, but also corresponding <code>string</code>, because general scenes are scaled based on endpoints or centers.</p></li> <li><p><strong>Examples</strong></p></li></ul> <div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">const</span> bs <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BScroll</span><span class="token punctuation">(</span><span class="token string">'.bs-wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
  <span class="token literal-property property">freeScroll</span><span class="token operator">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span>
  <span class="token literal-property property">scrollX</span><span class="token operator">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span>
  <span class="token literal-property property">scrollY</span><span class="token operator">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span>
  <span class="token literal-property property">zoom</span><span class="token operator">:</span> <span class="token punctuation">{</span>
    <span class="token literal-property property">start</span><span class="token operator">:</span> <span class="token number">1</span><span class="token punctuation">,</span>
    <span class="token literal-property property">min</span><span class="token operator">:</span> <span class="token number">0.5</span><span class="token punctuation">,</span>
    <span class="token literal-property property">max</span><span class="token operator">:</span> <span class="token number">2</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
<span class="token comment">// scaled to 1.8 based on the bottom left point of the scaled element</span>
bs<span class="token punctuation">.</span><span class="token function">zoomTo</span><span class="token punctuation">(</span><span class="token number">1.8</span><span class="token punctuation">,</span> <span class="token string">'left'</span><span class="token punctuation">,</span> <span class="token string">'bottom'</span><span class="token punctuation">)</span>
<span class="token comment">// animation duration is 1000ms</span>
bs<span class="token punctuation">.</span><span class="token function">zoomTo</span><span class="token punctuation">(</span><span class="token number">1.8</span><span class="token punctuation">,</span> <span class="token string">'left'</span><span class="token punctuation">,</span> <span class="token string">'bottom'</span><span class="token punctuation">,</span> <span class="token number">1000</span><span class="token punctuation">)</span>
<span class="token comment">// scaled to 1.8 based on offsetLeft 100px &amp; offsetTop 100px of the scaled element</span>
bs<span class="token punctuation">.</span><span class="token function">zoomTo</span><span class="token punctuation">(</span><span class="token number">1.8</span><span class="token punctuation">,</span> <span class="token number">100</span><span class="token punctuation">,</span> <span class="token number">100</span><span class="token punctuation">)</span>
<span class="token comment">// scaled to 2 based on the center of scaled element</span>
bs<span class="token punctuation">.</span><span class="token function">zoomTo</span><span class="token punctuation">(</span><span class="token number">2</span><span class="token punctuation">,</span> <span class="token string">'center'</span><span class="token punctuation">,</span> <span class="token string">'center'</span><span class="token punctuation">)</span>
</code></pre></div><h2 id="events"><a href="#events" class="header-anchor">#</a> Events</h2> <h3 id="beforezoomstart"><a href="#beforezoomstart" class="header-anchor">#</a> beforeZoomStart</h3> <ul><li><strong>Arguments</strong>: none</li> <li><strong>Trigger timing</strong>: When two fingers touch the scaled element, it does not include directly calling the <code>zoomTo</code> method</li></ul> <h3 id="zoomstart"><a href="#zoomstart" class="header-anchor">#</a> zoomStart</h3> <ul><li><strong>Arguments</strong>: none</li> <li><strong>Trigger timing</strong>: The two finger zoom distance exceeds the minimum threshold <code>minimalZoomDistance</code>, and the zoom will start soon. it does not include directly calling the <code>zoomTo</code> method</li></ul> <h3 id="zooming"><a href="#zooming" class="header-anchor">#</a> zooming</h3> <ul><li><p><strong>Arguments</strong>: <code>{ scale }</code></p></li> <li><p><strong>Type</strong>: <code>{ scale: number }</code></p></li> <li><p><strong>Trigger timing</strong>: the process of two-finger zooming action in progress or directly calling <code>zoomTo</code> to zoom</p></li> <li><p><strong>Examples</strong>:</p></li></ul> <div class="language-js extra-class"><pre class="language-js"><code>  <span class="token keyword">const</span> bs <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">BScroll</span><span class="token punctuation">(</span><span class="token string">'.bs-wrapper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
    <span class="token literal-property property">freeScroll</span><span class="token operator">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span>
    <span class="token literal-property property">scrollX</span><span class="token operator">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span>
    <span class="token literal-property property">scrollY</span><span class="token operator">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span>
    <span class="token literal-property property">zoom</span><span class="token operator">:</span> <span class="token punctuation">{</span>
      <span class="token literal-property property">start</span><span class="token operator">:</span> <span class="token number">1</span><span class="token punctuation">,</span>
      <span class="token literal-property property">min</span><span class="token operator">:</span> <span class="token number">0.5</span><span class="token punctuation">,</span>
      <span class="token literal-property property">max</span><span class="token operator">:</span> <span class="token number">2</span>
    <span class="token punctuation">}</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>

  bs<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'zooming'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token parameter"><span class="token punctuation">{</span> scale <span class="token punctuation">}</span></span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token comment">// use scale</span>
    console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>scale<span class="token punctuation">)</span> <span class="token comment">// current scale</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre></div><h3 id="zoomend"><a href="#zoomend" class="header-anchor">#</a> zoomEnd</h3> <ul><li><strong>Arguments</strong>: <code>{ scale }</code></li> <li><strong>Type</strong>: <code>{ scale: number }</code></li> <li><strong>Trigger timing</strong>: After two finger zooming behavior ends (if there is a rebound, the trigger timing is after the rebound animation ends) or after calling <code>zoomTo</code> to complete the zoom</li></ul> <div class="custom-block warning"><p class="custom-block-title">WARNING</p> <p>In the zoom scenario, you should listen to events such as <code>zoomStart</code>, <code>zooming</code>, <code>zoomEnd</code>, and not the lower-level <code>scroll</code> and <code>scrollEnd</code> events, otherwise it may not match your expectations.</p></div></div> <footer class="page-edit"><div class="edit-link"><a href="https://github.com/ustbhuangyi/better-scroll/edit/dev/packages/vuepress-docs/docs/en-US/plugins/zoom.md" target="_blank" rel="noopener noreferrer">Edit this page on GitHub</a> <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></div> <div class="last-updated"><span class="prefix">Last Updated:</span> <span class="time">1/7/2021, 10:43:35 AM</span></div></footer> <div class="page-nav"><p class="inner"><span class="prev">
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