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observe-image.html

observe-image.html 35 KB
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  1. <!DOCTYPE html>
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  5.     <meta name="viewport" content="width=device-width,initial-scale=1">
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  6.     <title>observe-image | BetterScroll 2.0</title>
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  18.     <link rel="preload" href="/docs/assets/css/0.styles.0cd93813.css" as="style"><link rel="preload" href="/docs/assets/js/app.c71b64d3.js" as="script"><link rel="preload" href="/docs/assets/js/5.d6412664.js" as="script"><link rel="preload" href="/docs/assets/js/4.4855b9ef.js" as="script"><link rel="preload" href="/docs/assets/js/3.481632b4.js" as="script"><link rel="preload" href="/docs/assets/js/91.32b2ad41.js" as="script"><link rel="preload" href="/docs/assets/js/7.518ccda7.js" as="script"><link rel="preload" href="/docs/assets/js/56.cd04bae9.js" as="script"><link rel="prefetch" href="/docs/assets/js/1.8644db92.js"><link rel="prefetch" href="/docs/assets/js/10.6f8c38eb.js"><link rel="prefetch" href="/docs/assets/js/100.ee08226e.js"><link rel="prefetch" href="/docs/assets/js/101.fd2f3d9f.js"><link rel="prefetch" href="/docs/assets/js/102.79d86e3d.js"><link rel="prefetch" href="/docs/assets/js/103.7a3ae3b5.js"><link rel="prefetch" href="/docs/assets/js/104.7be4589d.js"><link 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    19. 

  19.     <link rel="stylesheet" href="/docs/assets/css/0.styles.0cd93813.css">
    20. 

  20.   </head>
    21. 

  21.   <body>
    22. 

  22.     <div id="app" data-server-rendered="true"><div class="theme-container"><header class="navbar"><div class="sidebar-button"><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" role="img" viewBox="0 0 448 512" class="icon"><path fill="currentColor" d="M436 124H12c-6.627 0-12-5.373-12-12V80c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12zm0 160H12c-6.627 0-12-5.373-12-12v-32c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12zm0 160H12c-6.627 0-12-5.373-12-12v-32c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12z"></path></svg></div> <a href="/docs/en-US/" class="home-link router-link-active"><img src="https://dpubstatic.udache.com/static/dpubimg/t_L6vAgQ-E/logo.svg" alt="BetterScroll 2.0" class="logo"> <span class="site-name can-hide">BetterScroll 2.0</span></a> <div class="links"><form id="search-form" role="search" class="algolia-search-wrapper search-box"><input id="algolia-search-input" class="search-query"></form> <nav class="nav-links can-hide"><div class="nav-item"><a href="/docs/en-US/guide/" class="nav-link">
    23. 

  23.   Guide
    24. 

  24. </a></div><div class="nav-item"><a href="/docs/en-US/plugins/" class="nav-link router-link-active">
    25. 

  25.   Plugin
    26. 

  26. </a></div><div class="nav-item"><a href="/docs/en-US/FAQ/" class="nav-link">
    27. 

  27.   FAQ
    28. 

  28. </a></div><div class="nav-item"><a href="https://github.com/ustbhuangyi/better-scroll/issues" target="_blank" rel="noopener noreferrer" class="nav-link external">
    29. 

  29.   Discuss
    30. 

  30.   <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></a></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="Select language" class="dropdown-title"><span class="title">Languages</span> <span class="arrow down"></span></button> <button type="button" aria-label="Select language" class="mobile-dropdown-title"><span class="title">Languages</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/docs/en-US/plugins/observe-image.html" aria-current="page" class="nav-link router-link-exact-active router-link-active">
    31. 

  31.   English
    32. 

  32. </a></li><li class="dropdown-item"><!----> <a href="/docs/zh-CN/plugins/observe-image.html" class="nav-link">
    33. 

  33.   简体中文
    34. 

  34. </a></li></ul></div></div> <a href="https://github.com/ustbhuangyi/better-scroll" target="_blank" rel="noopener noreferrer" class="repo-link">
    35. 

  35.     GitHub
    36. 

  36.     <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></a></nav></div></header> <div class="sidebar-mask"></div> <aside class="sidebar"><nav class="nav-links"><div class="nav-item"><a href="/docs/en-US/guide/" class="nav-link">
    37. 

  37.   Guide
    38. 

  38. </a></div><div class="nav-item"><a href="/docs/en-US/plugins/" class="nav-link router-link-active">
    39. 

  39.   Plugin
    40. 

  40. </a></div><div class="nav-item"><a href="/docs/en-US/FAQ/" class="nav-link">
    41. 

  41.   FAQ
    42. 

  42. </a></div><div class="nav-item"><a href="https://github.com/ustbhuangyi/better-scroll/issues" target="_blank" rel="noopener noreferrer" class="nav-link external">
    43. 

  43.   Discuss
    44. 

  44.   <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></a></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="Select language" class="dropdown-title"><span class="title">Languages</span> <span class="arrow down"></span></button> <button type="button" aria-label="Select language" class="mobile-dropdown-title"><span class="title">Languages</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/docs/en-US/plugins/observe-image.html" aria-current="page" class="nav-link router-link-exact-active router-link-active">
    45. 

  45.   English
    46. 

  46. </a></li><li class="dropdown-item"><!----> <a href="/docs/zh-CN/plugins/observe-image.html" class="nav-link">
    47. 

  47.   简体中文
    48. 

  48. </a></li></ul></div></div> <a href="https://github.com/ustbhuangyi/better-scroll" target="_blank" rel="noopener noreferrer" class="repo-link">
    49. 

  49.     GitHub
    50. 

  50.     <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></a></nav>  <ul class="sidebar-links"><li><section class="sidebar-group depth-0"><p class="sidebar-heading"><span>Plugins Guide</span> <!----></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/docs/en-US/plugins/" aria-current="page" class="sidebar-link">plugins</a></li><li><a href="/docs/en-US/plugins/how-to-write.html" class="sidebar-link">How to write plugins</a></li></ul></section></li><li><section class="sidebar-group depth-0"><p class="sidebar-heading open"><span>Plugins</span> <!----></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/docs/en-US/plugins/mouse-wheel.html" class="sidebar-link">mouse-wheel</a></li><li><a href="/docs/en-US/plugins/observe-dom.html" class="sidebar-link">observe-dom</a></li><li><a href="/docs/en-US/plugins/observe-image.html" aria-current="page" class="active sidebar-link">observe-image</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/docs/en-US/plugins/observe-image.html#introduction" class="sidebar-link">Introduction</a></li><li class="sidebar-sub-header"><a href="/docs/en-US/plugins/observe-image.html#install" class="sidebar-link">Install</a></li><li class="sidebar-sub-header"><a href="/docs/en-US/plugins/observe-image.html#usage" class="sidebar-link">Usage</a></li><li class="sidebar-sub-header"><a href="/docs/en-US/plugins/observe-image.html#demo" class="sidebar-link">Demo</a></li><li class="sidebar-sub-header"><a href="/docs/en-US/plugins/observe-image.html#observeimage-options" class="sidebar-link">observeImage Options</a></li></ul></li><li><a href="/docs/en-US/plugins/pulldown.html" class="sidebar-link">pulldown</a></li><li><a href="/docs/en-US/plugins/pullup.html" class="sidebar-link">pullup</a></li><li><a href="/docs/en-US/plugins/scroll-bar.html" class="sidebar-link">scrollbar</a></li><li><a href="/docs/en-US/plugins/indicators.html" class="sidebar-link">indicators</a></li><li><a href="/docs/en-US/plugins/slide.html" class="sidebar-link">slide</a></li><li><a href="/docs/en-US/plugins/wheel.html" class="sidebar-link">wheel</a></li><li><a href="/docs/en-US/plugins/zoom.html" class="sidebar-link">zoom</a></li><li><a href="/docs/en-US/plugins/nested-scroll.html" class="sidebar-link">nested-scroll</a></li><li><a href="/docs/en-US/plugins/infinity.html" class="sidebar-link">infinity</a></li><li><a href="/docs/en-US/plugins/movable.html" class="sidebar-link">movable</a></li></ul></section></li></ul> </aside> <main class="page"> <div class="theme-default-content content__default"><h1 id="observe-image"><a href="#observe-image" class="header-anchor">#</a> observe-image <span class="badge tip" style="vertical-align:top;" data-v-15b7b770>2.1.0</span></h1> <h2 id="introduction"><a href="#introduction" class="header-anchor">#</a> Introduction</h2> <p>Turn on the detection of the loading of image elements in the wrapper child element. Regardless of whether the image is loaded successfully or not, BetterScroll's <code>refresh</code> method is automatically called to recalculate the scrollable width or height, which was supported in v2.1.0.</p> <div class="custom-block tip"><p class="custom-block-title">TIP</p> <p>For scenes where CSS has been used to determine the width and height of the image, this plugin should not be used, because each call to refresh will affect performance. You only need it if the width or height of the image is uncertain.</p></div> <h2 id="install"><a href="#install" class="header-anchor">#</a> Install</h2> <div class="language-bash extra-class"><pre class="language-bash"><code><span class="token function">npm</span> <span class="token function">install</span> @better-scroll/observe-image <span class="token parameter variable">--save</span>
    51. 

  51. 

  52. // or
    53. 

  53. 

  54. <span class="token function">yarn</span> <span class="token function">add</span> @better-scroll/observe-image
    55. 

  55. </code></pre></div><h2 id="usage"><a href="#usage" class="header-anchor">#</a> Usage</h2> <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>
    56. 

  56.   <span class="token keyword">import</span> ObserveImage <span class="token keyword">from</span> <span class="token string">'@better-scroll/observe-image'</span>
    57. 

  57.   BScroll<span class="token punctuation">.</span><span class="token function">use</span><span class="token punctuation">(</span>ObserveImage<span class="token punctuation">)</span>
    58. 

  58. 

  59.   <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>
    60. 

  60.     <span class="token comment">//...</span>
    61. 

  61.     <span class="token literal-property property">observeImage</span><span class="token operator">:</span> <span class="token boolean">true</span>
    62. 

  62.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    63. 

  63. </code></pre></div><h2 id="demo"><a href="#demo" class="header-anchor">#</a> Demo</h2> <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_55ft48s1fm" 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>
    64. 

  64.   <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>observe-image-container<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
    65. 

  65.     <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>scroll-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>scroll<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
    66. 

  66.       <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>scroll-content<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
    67. 

  67.         <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>img</span> <span class="token attr-name">width</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>100%<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>(url, index) in images<span class="token punctuation">&quot;</span></span> <span class="token attr-name">:src</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>url<span class="token punctuation">&quot;</span></span> <span class="token attr-name">alt</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span><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>index<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
    68. 

  68.       <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span>
    69. 

  69.     <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span>
    70. 

  70.   <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span>
    71. 

  71. <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">
    72. 

  72.   <span class="token keyword">import</span> BScroll <span class="token keyword">from</span> <span class="token string">'@better-scroll/core'</span>
    73. 

  73.   <span class="token keyword">import</span> ObserveImage <span class="token keyword">from</span> <span class="token string">'@better-scroll/observe-image'</span>
    74. 

  74. 

  75.   BScroll<span class="token punctuation">.</span><span class="token function">use</span><span class="token punctuation">(</span>ObserveImage<span class="token punctuation">)</span>
    76. 

  76.   <span class="token keyword">export</span> <span class="token keyword">default</span> <span class="token punctuation">{</span>
    77. 

  77.     <span class="token function">data</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    78. 

  78.       <span class="token keyword">return</span> <span class="token punctuation">{</span>
    79. 

  79.         <span class="token literal-property property">images</span><span class="token operator">:</span> <span class="token punctuation">[</span>
    80. 

  80.           <span class="token string">'https://dpubstatic.udache.com/static/dpubimg/dEswI1MVy6/zoo.png'</span><span class="token punctuation">,</span>
    81. 

  81.           <span class="token string">'https://dpubstatic.udache.com/static/dpubimg/BYb_wPak21/home.png'</span><span class="token punctuation">,</span>
    82. 

  82.           <span class="token string">'https://dpubstatic.udache.com/static/dpubimg/B6q1pWB0sB/cabin.png'</span><span class="token punctuation">,</span>
    83. 

  83.           <span class="token string">'https://dpubstatic.udache.com/static/dpubimg/76n1ilzf4R/stone.png'</span>
    84. 

  84.         <span class="token punctuation">]</span>
    85. 

  85.       <span class="token punctuation">}</span>
    86. 

  86.     <span class="token punctuation">}</span><span class="token punctuation">,</span>
    87. 

  87.     <span class="token function">mounted</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    88. 

  88.       <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>
    89. 

  89.     <span class="token punctuation">}</span><span class="token punctuation">,</span>
    90. 

  90.     <span class="token function">beforeDestroy</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    91. 

  91.       <span class="token keyword">this</span><span class="token punctuation">.</span>bs<span class="token punctuation">.</span><span class="token function">destroy</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    92. 

  92.     <span class="token punctuation">}</span><span class="token punctuation">,</span>
    93. 

  93.     <span class="token literal-property property">methods</span><span class="token operator">:</span> <span class="token punctuation">{</span>
    94. 

  94.       <span class="token function">init</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    95. 

  95.         <span class="token keyword">this</span><span class="token punctuation">.</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 keyword">this</span><span class="token punctuation">.</span>$refs<span class="token punctuation">.</span>scroll<span class="token punctuation">,</span> <span class="token punctuation">{</span>
    96. 

  96.           <span class="token literal-property property">observeImage</span><span class="token operator">:</span> <span class="token boolean">true</span>
    97. 

  97.         <span class="token punctuation">}</span><span class="token punctuation">)</span>
    98. 

  98.       <span class="token punctuation">}</span>
    99. 

  99.     <span class="token punctuation">}</span>
    100. 

  100.   <span class="token punctuation">}</span>
    101. 

  101. </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> scoped&gt;
    102. 

  102. 

  103. <span class="token selector">.observe-image-container</span>
    104. 

  104.   <span class="token property-declaration"><span class="token property">text-align</span> center</span>
    105. 

  105.   <span class="token selector">.scroll-wrapper</span>
    106. 

  106.     <span class="token property-declaration"><span class="token property">position</span> relative</span>
    107. 

  107.     <span class="token property-declaration"><span class="token property">width</span> <span class="token number">300</span><span class="token unit">px</span></span>
    108. 

  108.     <span class="token property-declaration"><span class="token property">height</span> <span class="token number">300</span><span class="token unit">px</span></span>
    109. 

  109.     <span class="token property-declaration"><span class="token property">margin</span> <span class="token number">20</span><span class="token unit">px</span> auto</span>
    110. 

  110.     <span class="token property-declaration"><span class="token property">border</span> <span class="token number">3</span><span class="token unit">px</span> solid <span class="token hexcode">#42b983</span></span>
    111. 

  111.     <span class="token property-declaration"><span class="token property">border-radius</span> <span class="token number">5</span><span class="token unit">px</span></span>
    112. 

  112.     <span class="token property-declaration"><span class="token property">overflow</span> hidden</span>
    113. 

  113.   <span class="token selector">.scroll-content</span>
    114. 

  114.     <span class="token property-declaration"><span class="token property">font-size</span> <span class="token number">0</span></span>
    115. 

  115. &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="observeimage-options"><a href="#observeimage-options" class="header-anchor">#</a> observeImage Options</h2> <div class="custom-block tip"><p class="custom-block-title">TIP</p> <p>When <code>observeImage</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>
    116. 

  116.   <span class="token literal-property property">observeImage</span><span class="token operator">:</span> <span class="token boolean">true</span>
    117. 

  117. <span class="token punctuation">}</span><span class="token punctuation">)</span>
    118. 

  118. 

  119. <span class="token comment">// equals</span>
    120. 

  120. 

  121. <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>
    122. 

  122.   <span class="token literal-property property">observeImage</span><span class="token operator">:</span> <span class="token punctuation">{</span>
    123. 

  123.     <span class="token literal-property property">debounceTime</span><span class="token operator">:</span> <span class="token number">100</span> <span class="token comment">// ms</span>
    124. 

  124.   <span class="token punctuation">}</span>
    125. 

  125. <span class="token punctuation">}</span><span class="token punctuation">)</span>
    126. 

  126. </code></pre></div></div> <h3 id="debouncetime"><a href="#debouncetime" class="header-anchor">#</a> debounceTime</h3> <ul><li><p><strong>Type</strong>: <code>number</code></p></li> <li><p><strong>Default</strong>: <code>100</code></p> <p>After detecting the success or failure of the image loading, the refresh method will be called after <strong>debounceTime</strong> milliseconds to recalculate the scrollable height or width. If multiple images load successfully or fail within debounceTime milliseconds, the <strong>refresh</strong> method will only be called once.</p> <div class="custom-block tip"><p class="custom-block-title">TIP</p> <p>When <strong>debounceTime</strong> is 0, the <strong>refresh</strong> method will be called immediately instead of using <strong>setTimeout</strong>.</p></div></li></ul></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/observe-image.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">1/27/2021, 5:51:54 PM</span></div></footer> <div class="page-nav"><p class="inner"><span class="prev">
    127. 

  127.       ←
    128. 

  128.       <a href="/docs/en-US/plugins/observe-dom.html" class="prev">
    129. 

  129.         observe-dom
    130. 

  130.       </a></span> <span class="next"><a href="/docs/en-US/plugins/pulldown.html">
    131. 

  131.         pulldown
    132. 

  132.       </a>
    133. 

  133.       →
    134. 

  134.     </span></p></div> </main></div><div class="global-ui"><!----></div></div>
    135. 

  135.     <script src="/docs/assets/js/app.c71b64d3.js" defer></script><script src="/docs/assets/js/5.d6412664.js" defer></script><script src="/docs/assets/js/4.4855b9ef.js" defer></script><script src="/docs/assets/js/3.481632b4.js" defer></script><script src="/docs/assets/js/91.32b2ad41.js" defer></script><script src="/docs/assets/js/7.518ccda7.js" defer></script><script src="/docs/assets/js/56.cd04bae9.js" defer></script>
    136. 

  136.   </body>
    137. 

  137. </html>
    138.