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| <div id="app" data-server-rendered="true"><div class="theme-container vuepress-theme-fast"><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="/" class="home-link router-link-active"><img src="/logo@2x.svg" alt="WEEX" class="logo"></a><span class="version"><a href="/download/download.html" class="version-bg"><img src="/assets/img/version-bg.ab65ded9.svg" alt="v0.28"><span class="version-no">v0.28</span></a></span><div class="links"><form id="search-form" class="algolia-search-wrapper 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class="sidebar-group-items"><li><a href="/docs/components/a.html" class="sidebar-link"><a></a></li><li><a href="/docs/components/div.html" class="sidebar-link"><div></a></li><li><a href="/docs/components/text.html" class="sidebar-link"><text></a></li><li><a href="/docs/components/image.html" class="sidebar-link"><image></a></li><li><a href="/docs/components/list.html" class="sidebar-link"><list></a></li><li><a href="/docs/components/cell.html" class="sidebar-link"><cell></a></li><li><a href="/docs/components/loading.html" class="sidebar-link"><loading></a></li><li><a href="/docs/components/refresh.html" class="sidebar-link"><refresh></a></li><li><a href="/docs/components/recycle-list.html" class="sidebar-link"><recycle-list></a></li><li><a href="/docs/components/scroller.html" class="sidebar-link"><scroller></a></li><li><a href="/docs/components/slider.html" class="sidebar-link"><slider></a></li><li><a href="/docs/components/indicator.html" class="sidebar-link"><indicator></a></li><li><a href="/docs/components/textarea.html" class="sidebar-link"><textarea></a></li><li><a href="/docs/components/input.html" class="sidebar-link"><input></a></li><li><a href="/docs/components/waterfall.html" class="sidebar-link"><waterfall></a></li><li><a href="/docs/components/video.html" class="sidebar-link"><video></a></li><li><a href="/docs/components/web.html" class="sidebar-link"><web></a></li><li><a href="/docs/components/richtext.html" class="sidebar-link"><richtext></a></li></ul></div></li><li><div class="sidebar-group"><p class="sidebar-heading open"><span>Built-in Modules</span><!----></p><ul class="sidebar-group-items"><li><a href="/docs/modules/animation.html" class="sidebar-link">animation</a></li><li><a href="/docs/modules/clipboard.html" class="sidebar-link">clipboard</a></li><li><a href="/docs/modules/dom.html" class="sidebar-link">dom</a></li><li><a href="/docs/modules/globalEvent.html" class="sidebar-link">globalEvent</a></li><li><a href="/docs/modules/meta.html" class="active sidebar-link">meta</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/docs/modules/meta.html#setviewport" class="sidebar-link">setViewport</a></li></ul></li><li><a href="/docs/modules/modal.html" class="sidebar-link">modal</a></li><li><a href="/docs/modules/navigator.html" class="sidebar-link">navigator</a></li><li><a href="/docs/modules/picker.html" class="sidebar-link">picker</a></li><li><a href="/docs/modules/storage.html" class="sidebar-link">storage</a></li><li><a href="/docs/modules/stream.html" class="sidebar-link">stream</a></li><li><a href="/docs/modules/webview.html" class="sidebar-link">webview</a></li><li><a href="/docs/modules/websockets.html" class="sidebar-link">webSockets</a></li><li><a href="/docs/modules/deviceInfo.html" class="sidebar-link">deviceInfo</a></li><li><a href="/docs/modules/console-log.html" class="sidebar-link">console-log</a></li></ul></div></li><li><div class="sidebar-group"><p class="sidebar-heading"><span>Styles</span><!----></p><ul class="sidebar-group-items"><li><a href="/docs/styles/common-styles.html" class="sidebar-link">Common Styles</a></li><li><a href="/docs/styles/text-styles.html" class="sidebar-link">Text Styles</a></li><li><a href="/docs/styles/css-units.html" class="sidebar-link">CSS Units</a></li><li><a href="/docs/styles/color-name.html" class="sidebar-link">Color name</a></li></ul></div></li><li><div class="sidebar-group"><p class="sidebar-heading"><span>Events</span><!----></p><ul class="sidebar-group-items"><li><a href="/docs/events/common-events.html" class="sidebar-link">Common Events</a></li><li><a href="/docs/events/event-bubbling.html" class="sidebar-link">Event Bubble</a></li><li><a href="/docs/events/gesture.html" class="sidebar-link">Gesture</a></li></ul></div></li></ul></div><div class="page"><div class="content"><h1 id="meta"><a href="#meta" class="header-anchor">#</a> meta</h1><p>The meta module can be used to update meta information for a single page, such as the viewport of the container.</p><h1 id="api"><a href="#api" class="header-anchor">#</a> API</h1><h2 id="setviewport"><a href="#setviewport" class="header-anchor">#</a> setViewport</h2><p>The default width (viewport) of Weex container is 750px. The <code>setViewport</code> method can change the viewport of the page and only takes effect on the current page.</p><h4 id="setviewport-options"><a href="#setviewport-options" class="header-anchor">#</a> setViewport(options)</h4><ul><li><strong>@options</strong><ul><li><strong><code>width</code></strong>, number value or <code>"device-width"</code> or <code>"device-height"</code> macros.</li><li><strong><code>height</code></strong>, number value or <code>"device-width"</code> or <code>"device-height"</code> macros. |
| <ul><li><strong><code>deviceWidth</code></strong>，number value.</li></ul></li></ul><div class="danger custom-block"><p class="custom-block-title">WARNING</p><p>iOS only,Android not support yet</p></div><ul><li><strong><code>deviceHeight</code></strong>，number value.</li></ul><div class="danger custom-block"><p class="custom-block-title">WARNING</p><p>iOS only,Android not support yet</p></div><ul><li><strong><code>roundOffDeviation</code></strong><span class="badge warn middle">0.20.0+</span>, The default value is true, which means that the layout engine ignores the error caused by the decimal point in the layout; if there is a gap in the component splicing, you can set the <code>roundOffDeviation</code> to false, and the layout engine will automatically fill in the decimal point error.</li><li><strong><code>reserveCssStyles</code></strong>,set true to let the page reserve all CSS style values,designed to support screen rotation |
| ,<a href="https://weex.apache.org/guide/advanced/multi-size-screen.html" target="_blank" rel="noopener noreferrer">document<svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" 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></a>。</li></ul></li></ul><div class="tip custom-block"><p class="custom-block-title">TIP</p><ul><li>Referance: W3C Spec <a href="https://drafts.csswg.org/css-device-adapt/#viewport-meta" target="_blank" rel="noopener noreferrer">CSS Device Adaptation<svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" 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></a>.</li><li>The default unit of the width and height is <code>px</code>, other units are not supported.</li><li>The viewport must be set before the page rendering starts. ** In other words, the <code>setViewport</code> method can only be used in the entry file, and before the <code>new Vue (...)</code> statement. If it's used in the component, the code is executed only when the component is being rendered, meanwhile, the page is already in the rendering process, set the viewport will not take effect again.</li></ul></div><h4 id="demo"><a href="#demo" class="header-anchor">#</a> Demo</h4><p>The entry file:</p><div class="language-js extra-class"><pre class="language-js"><code><span class="token comment">// entry.js</span> |
| |
| <span class="token keyword">import</span> App <span class="token keyword">from</span> <span class="token string">'./app.vue'</span> |
| <span class="token keyword">const</span> meta <span class="token operator">=</span> weex<span class="token punctuation">.</span><span class="token function">requireModule</span><span class="token punctuation">(</span><span class="token string">'meta'</span><span class="token punctuation">)</span> |
| |
| <span class="token comment">// The width of the viewport is set to 640px</span> |
| meta<span class="token punctuation">.</span><span class="token function">setViewport</span><span class="token punctuation">(</span><span class="token punctuation">{</span> |
| width<span class="token punctuation">:</span> <span class="token number">640</span><span class="token punctuation">,</span> |
| roundOffDeviation<span class="token punctuation">:</span> <span class="token boolean">false</span> |
| reserveCssStyles<span class="token punctuation">:</span> <span class="token boolean">true</span> |
| <span class="token punctuation">}</span><span class="token punctuation">)</span> |
| |
| App<span class="token punctuation">.</span>el <span class="token operator">=</span> <span class="token string">'#root'</span> |
| <span class="token keyword">new</span> <span class="token class-name">Vue</span><span class="token punctuation">(</span>App<span class="token punctuation">)</span> |
| </code></pre></div><p>After configuring the width of the viewport to 640 in the entry.js, all the components in the current page will take 640px as full screen width.</p><p>Example component:</p><div class="language-html extra-class"><pre class="language-html"><code><span class="token comment"><!-- app.vue --></span> |
| <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>template</span><span class="token punctuation">></span></span> |
| <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>div</span><span class="token punctuation">></span></span> |
| <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>box750<span class="token punctuation">"</span></span><span class="token punctuation">></span></span> |
| <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>text</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>text<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>750<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>text</span><span class="token punctuation">></span></span> |
| <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>box640<span class="token punctuation">"</span></span><span class="token punctuation">></span></span> |
| <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>text</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>text<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>640<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>text</span><span class="token punctuation">></span></span> |
| <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>box480<span class="token punctuation">"</span></span><span class="token punctuation">></span></span> |
| <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>text</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>text<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>480<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>text</span><span class="token punctuation">></span></span> |
| <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>div</span><span class="token punctuation">></span></span> |
| <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>div</span><span class="token punctuation">></span></span> |
| <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>div</span><span class="token punctuation">></span></span> |
| <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>div</span><span class="token punctuation">></span></span> |
| <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>template</span><span class="token punctuation">></span></span> |
| |
| <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>style</span> <span class="token attr-name">scoped</span><span class="token punctuation">></span></span><span class="token style"><span class="token language-css"> |
| <span class="token selector">.box750</span> <span class="token punctuation">{</span> |
| <span class="token property">width</span><span class="token punctuation">:</span> 750px<span class="token punctuation">;</span> |
| <span class="token property">height</span><span class="token punctuation">:</span> 750px<span class="token punctuation">;</span> |
| <span class="token property">background-color</span><span class="token punctuation">:</span> #EEEEEE<span class="token punctuation">;</span> |
| <span class="token punctuation">}</span> |
| <span class="token selector">.box640</span> <span class="token punctuation">{</span> |
| <span class="token property">width</span><span class="token punctuation">:</span> 640px<span class="token punctuation">;</span> |
| <span class="token property">height</span><span class="token punctuation">:</span> 640px<span class="token punctuation">;</span> |
| <span class="token property">background-color</span><span class="token punctuation">:</span> #CCCCCC<span class="token punctuation">;</span> |
| <span class="token punctuation">}</span> |
| <span class="token selector">.box480</span> <span class="token punctuation">{</span> |
| <span class="token property">width</span><span class="token punctuation">:</span> 480px<span class="token punctuation">;</span> |
| <span class="token property">height</span><span class="token punctuation">:</span> 480px<span class="token punctuation">;</span> |
| <span class="token property">background-color</span><span class="token punctuation">:</span> #AAAAAA<span class="token punctuation">;</span> |
| <span class="token punctuation">}</span> |
| <span class="token selector">.text</span> <span class="token punctuation">{</span> |
| <span class="token property">font-size</span><span class="token punctuation">:</span> 50px<span class="token punctuation">;</span> |
| <span class="token punctuation">}</span> |
| </span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>style</span><span class="token punctuation">></span></span> |
| </code></pre></div><p><a href="http://dotwe.org/vue/7d0302fe499ab08afdb12a376c646b59" target="_blank" rel="noopener noreferrer">Try it<svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" 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></a>. (The http://dotwe.org doesn't support to configure the entry file currently.)</p><p>Referance: <a href="/guide/develop/setup-develop-environment.html">Set up development environment</a>.</p></div><div class="page-nav"><p class="inner"><span class="prev"> |
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