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classNames在react上的应用.html
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classNames在react上的应用.html
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<h3 id="前言"><a href="#前言" class="headerlink" title="前言"></a>前言</h3><p>在 Vue 里有一个动态的 class 语法，很好的根据条件动态设置 class。例如：</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><div <span class="class"><span class="keyword">class</span></span>=<span class="string">"button"</span> :<span class="class"><span class="keyword">class</span></span>=<span class="string">"{ active: show }"</span>><<span class="regexp">/div></span></span><br></pre></td></tr></table></figure>
<p>就是当 show 为 true 时，此标签被赋予 active 样式。</p>
<p>在 React 要实现这样功能，可能会这样做：</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><div className={<span class="string">`button <span class="subst">${show ? <span class="string">'active'</span> : <span class="string">''</span>}</span>`</span>}><<span class="regexp">/div></span></span><br></pre></td></tr></table></figure>
<p>注意到，这里只有一个属性判断，如果有多个时会显得非常麻烦，那么现在使用 <a href="https://github.com/JedWatson/classnames" target="_blank" rel="noopener">ClassNames</a> 这个库来解决这个问题。</p>
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<h3 id="基本使用"><a href="#基本使用" class="headerlink" title="基本使用"></a>基本使用</h3><p><code>ClassNames</code> 是一个高性能、简便的用户根据条件动态设置 <code>className</code> 的 <code>Javascript</code> 库。</p>
<p>它的使用非常简单，来看看下面的几种使用方式。（自己也可以开发一个类似的库，不过没必要再造轮子）</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> classNames <span class="keyword">from</span> <span class="string">'classnames'</span>;</span><br><span class="line"></span><br><span class="line">classNames(<span class="string">'foo'</span>, <span class="string">'bar'</span>); <span class="comment">// => 'foo bar'</span></span><br><span class="line">classNames(<span class="string">'foo'</span>, { <span class="attr">bar</span>: <span class="literal">true</span> }); <span class="comment">// => 'foo bar'</span></span><br><span class="line">classNames({ <span class="string">'foo-bar'</span>: <span class="literal">true</span> }); <span class="comment">// => 'foo-bar'</span></span><br><span class="line">classNames({ <span class="string">'foo-bar'</span>: <span class="literal">false</span> }); <span class="comment">// => ''</span></span><br><span class="line">classNames({ <span class="attr">foo</span>: <span class="literal">true</span> }, { <span class="attr">bar</span>: <span class="literal">true</span> }); <span class="comment">// => 'foo bar'</span></span><br><span class="line">classNames({ <span class="attr">foo</span>: <span class="literal">true</span>, <span class="attr">bar</span>: <span class="literal">true</span> }); <span class="comment">// => 'foo bar'</span></span><br><span class="line"></span><br><span class="line"><span class="comment">// 多级嵌套，多参数</span></span><br><span class="line">classNames(<span class="string">'foo'</span>, { <span class="attr">bar</span>: <span class="literal">true</span>, <span class="attr">duck</span>: <span class="literal">false</span> }, <span class="string">'baz'</span>, { <span class="attr">quux</span>: <span class="literal">true</span> });</span><br><span class="line"><span class="comment">// => 'foo bar baz quux'</span></span><br><span class="line"></span><br><span class="line"><span class="comment">// !! 为 false 的将被忽略</span></span><br><span class="line">classNames(<span class="literal">null</span>, <span class="literal">false</span>, <span class="string">'bar'</span>, <span class="literal">undefined</span>, <span class="number">0</span>, <span class="number">1</span>, { <span class="attr">baz</span>: <span class="literal">null</span> }, <span class="string">''</span>);</span><br><span class="line"><span class="comment">// => 'bar 1'</span></span><br></pre></td></tr></table></figure>
<h3 id="动态属性名"><a href="#动态属性名" class="headerlink" title="动态属性名"></a>动态属性名</h3><p>在 ES6 下，可以使用模板语法，来设置跟强大的动态 <code>className</code>。</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">const</span> buttonType = <span class="string">'primary'</span>;</span><br><span class="line">classNames({ [<span class="string">`btn-<span class="subst">${buttonType}</span>`</span>]: <span class="literal">true</span> });</span><br></pre></td></tr></table></figure>
<h3 id="去重功能dedupe"><a href="#去重功能dedupe" class="headerlink" title="去重功能dedupe"></a>去重功能dedupe</h3><p>使用 dedupe 版本的 classNames 可以正确地对类进行重复数据删除，并确保在后面的参数中指定的错误类从结果集中排除。dedupe 会慢（约5倍），因此它是作为选择提供的（在默认是不会去重的）。</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> classNames <span class="keyword">from</span> <span class="string">'classnames/dedupe'</span>;</span><br><span class="line"></span><br><span class="line">classNames(<span class="string">'foo'</span>, <span class="string">'foo'</span>, <span class="string">'bar'</span>); <span class="comment">// => 'foo bar'</span></span><br><span class="line">classNames(<span class="string">'foo'</span>, { <span class="attr">foo</span>: <span class="literal">false</span>, <span class="attr">bar</span>: <span class="literal">true</span> }); <span class="comment">// => 'bar'</span></span><br></pre></td></tr></table></figure>
<h3 id="映射bind"><a href="#映射bind" class="headerlink" title="映射bind"></a>映射bind</h3><p>如果您使用 css-modules 或类似的方法来抽象类“名称”以及 className 实际输出到 DOM 的真实值，那么要使用 bind 版本。</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> classNames <span class="keyword">from</span> <span class="string">'classnames/bind'</span>;</span><br><span class="line"><span class="comment">// 映射关系</span></span><br><span class="line"><span class="keyword">const</span> styles = {</span><br><span class="line"> foo: <span class="string">'abc'</span>,</span><br><span class="line"> bar: <span class="string">'def'</span>,</span><br><span class="line"> baz: <span class="string">'xyz'</span></span><br><span class="line">};</span><br><span class="line"></span><br><span class="line"><span class="keyword">const</span> cx = classNames.bind(styles);</span><br><span class="line"><span class="keyword">const</span> className = cx(<span class="string">'foo'</span>, [<span class="string">'bar'</span>], { <span class="attr">baz</span>: <span class="literal">true</span> }); <span class="comment">//（1） => "abc def xyz"</span></span><br><span class="line"><span class="comment">// const className = cx('abc', ['def'], { xyz: true }); （2）</span></span><br></pre></td></tr></table></figure>
<p>这里什么意思呢？实际上就是把 foo 与 abc 产生映射，也就是说 （1） 和 （2） 两条语句是等效的，好处就像是定义一些常量一样。</p>
<h3 id="在React上使用"><a href="#在React上使用" class="headerlink" title="在React上使用"></a>在React上使用</h3><p>如antd上的源码，prefix定义class</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">const</span> prefixCls = <span class="string">'alter'</span>;</span><br><span class="line"></span><br><span class="line"><span class="keyword">const</span> classs = classNames(prefixCls, {</span><br><span class="line"> [<span class="string">`<span class="subst">${prefixCls}</span>-<span class="subst">${type}</span>`</span>]: <span class="literal">true</span>,</span><br><span class="line"> [<span class="string">`<span class="subst">${prefixCls}</span>-close`</span>]: !<span class="keyword">this</span>.state.closing,</span><br><span class="line"> [<span class="string">`<span class="subst">${prefixCls}</span>-with-description`</span>]: !!description,</span><br><span class="line"> [<span class="string">`<span class="subst">${prefixCls}</span>-no-icon`</span>]: !showIcon,</span><br><span class="line"> [<span class="string">`<span class="subst">${prefixCls}</span>-banner`</span>]: !!banner,</span><br><span class="line">}, className);</span><br></pre></td></tr></table></figure>
<h3 id="参考资料"><a href="#参考资料" class="headerlink" title="参考资料"></a>参考资料</h3><ul>
<li><a href="https://github.com/JedWatson/classnames" target="_blank" rel="noopener">https://github.com/JedWatson/classnames</a></li>
<li><a href="https://www.npmjs.com/package/classcat" target="_blank" rel="noopener">https://www.npmjs.com/package/classcat</a></li>
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<span>本文结束<i class="fa fa-meh-o fa-fw"></i>感谢您的阅读</span>
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<p><span>本文标题:</span><a href="/classNames%E5%9C%A8react%E4%B8%8A%E7%9A%84%E5%BA%94%E7%94%A8.html">classNames在react上的应用</a></p>
<p><span>文章作者:</span><a href="/" title="访问 陈宇（cosyer） 的个人博客">陈宇（cosyer）</a></p>
<p><span>发布时间:</span>2018年08月23日 - 17:08</p>
<p><span>最后更新:</span>2018年12月15日 - 13:12</p>
<p><span>原始链接:</span><a href="/classNames%E5%9C%A8react%E4%B8%8A%E7%9A%84%E5%BA%94%E7%94%A8.html" title="classNames在react上的应用">http://mydearest.cn/classNames%E5%9C%A8react%E4%B8%8A%E7%9A%84%E5%BA%94%E7%94%A8.html</a>
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