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Dan Abramov
451 lines
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HTML
451 lines
19 KiB
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<title>Web Components - React</title>
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<a class="edit-page-link" href="https://github.com/facebook/react/tree/master/docs/docs/web-components.md" target="_blank">Edit on GitHub</a>
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<h1>
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Web Components
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</h1>
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<div class="subHeader"></div>
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<p>React and <a href="https://developer.mozilla.org/en-US/docs/Web/Web_Components">Web Components</a> are built to solve different problems. Web Components provide strong encapsulation for reusable components, while React provides a declarative library that keeps the DOM in sync with your data. The two goals are complementary. As a developer, you are free to use React in your Web Components, or to use Web Components in React, or both.</p>
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<p>Most people who use React don't use Web Components, but you may want to, especially if you are using third-party UI components that are written using Web Components.</p>
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<h2>Using Web Components in React</h2>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="kr">class</span> <span class="nx">HelloMessage</span> <span class="kr">extends</span> <span class="nx">React</span><span class="p">.</span><span class="nx">Component</span> <span class="p">{</span>
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<span class="nx">render</span><span class="p">()</span> <span class="p">{</span>
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<span class="k">return</span> <span class="o"><</span><span class="nx">div</span><span class="o">></span><span class="nx">Hello</span> <span class="o"><</span><span class="nx">x</span><span class="o">-</span><span class="nx">search</span><span class="o">></span><span class="p">{</span><span class="k">this</span><span class="p">.</span><span class="nx">props</span><span class="p">.</span><span class="nx">name</span><span class="p">}</span><span class="o"><</span><span class="err">/x-search>!</div>;</span>
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<span class="p">}</span>
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<span class="p">}</span>
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</code></pre></div>
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<blockquote>
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<p>Note:</p>
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<p>Web Components often expose an imperative API. For instance, a <code>video</code> Web Component might expose <code>play()</code> and <code>pause()</code> functions. To access the imperative APIs of a Web Component, you will need to use a ref to interact with the DOM node directly. If you are using third-party Web Components, the best solution is to write a React component that behaves as a wrapper for your Web Component.</p>
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<p>Events emitted by a Web Component may not properly propagate through a React render tree.
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You will need to manually attach event handlers to handle these events within your React components.</p>
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</blockquote>
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<p>One common confusion is that Web Components use "class" instead of "className".</p>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="kd">function</span> <span class="nx">BrickFlipbox</span><span class="p">()</span> <span class="p">{</span>
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<span class="k">return</span> <span class="p">(</span>
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<span class="o"><</span><span class="nx">brick</span><span class="o">-</span><span class="nx">flipbox</span> <span class="kr">class</span><span class="o">=</span><span class="s2">"demo"</span><span class="o">></span>
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<span class="o"><</span><span class="nx">div</span><span class="o">></span><span class="nx">front</span><span class="o"><</span><span class="err">/div></span>
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<span class="o"><</span><span class="nx">div</span><span class="o">></span><span class="nx">back</span><span class="o"><</span><span class="err">/div></span>
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<span class="o"><</span><span class="err">/brick-flipbox></span>
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<span class="p">);</span>
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<span class="p">}</span>
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</code></pre></div>
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<h2>Using React in your Web Components</h2>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="kr">const</span> <span class="nx">proto</span> <span class="o">=</span> <span class="nb">Object</span><span class="p">.</span><span class="nx">create</span><span class="p">(</span><span class="nx">HTMLElement</span><span class="p">.</span><span class="nx">prototype</span><span class="p">,</span> <span class="p">{</span>
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<span class="nx">attachedCallback</span><span class="o">:</span> <span class="p">{</span>
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<span class="nx">value</span><span class="o">:</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
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<span class="kr">const</span> <span class="nx">mountPoint</span> <span class="o">=</span> <span class="nb">document</span><span class="p">.</span><span class="nx">createElement</span><span class="p">(</span><span class="s1">'span'</span><span class="p">);</span>
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<span class="k">this</span><span class="p">.</span><span class="nx">createShadowRoot</span><span class="p">().</span><span class="nx">appendChild</span><span class="p">(</span><span class="nx">mountPoint</span><span class="p">);</span>
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<span class="kr">const</span> <span class="nx">name</span> <span class="o">=</span> <span class="k">this</span><span class="p">.</span><span class="nx">getAttribute</span><span class="p">(</span><span class="s1">'name'</span><span class="p">);</span>
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<span class="kr">const</span> <span class="nx">url</span> <span class="o">=</span> <span class="s1">'https://www.google.com/search?q='</span> <span class="o">+</span> <span class="nb">encodeURIComponent</span><span class="p">(</span><span class="nx">name</span><span class="p">);</span>
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<span class="nx">ReactDOM</span><span class="p">.</span><span class="nx">render</span><span class="p">(</span><span class="o"><</span><span class="nx">a</span> <span class="nx">href</span><span class="o">=</span><span class="p">{</span><span class="nx">url</span><span class="p">}</span><span class="o">></span><span class="p">{</span><span class="nx">name</span><span class="p">}</span><span class="o"><</span><span class="err">/a>, mountPoint);</span>
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<span class="p">}</span>
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<span class="p">}</span>
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<span class="p">});</span>
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<span class="nb">document</span><span class="p">.</span><span class="nx">registerElement</span><span class="p">(</span><span class="s1">'x-search'</span><span class="p">,</span> <span class="p">{</span><span class="nx">prototype</span><span class="o">:</span> <span class="nx">proto</span><span class="p">});</span>
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</code></pre></div>
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