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          <h1 class="post-title" itemprop="name headline">解决软键盘弹窗 fixed失效问题</h1>


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        <h3 id="概述"><a href="#概述" class="headerlink" title="概述"></a>概述</h3><blockquote>
<p>这个问题常出现在移动web开发中聊天或者留言页面的绝对定位输入框上，页面超过屏幕大小时候输入框focus状态下（键盘弹出）绝对定位的元素失效，导致页面滚动时候把定位元素一并带走，体验十分不好，在此留下一自己的方法，让更多的人不需要再爬这样的小坑。</p>
</blockquote>
<h3 id="解决办法"><a href="#解决办法" class="headerlink" title="解决办法"></a>解决办法</h3><p>原理很简单，就是定义一个外框把页面包起来，把需要使用fixed定位的元素设置成<code>absolute</code>定位，然后设置外框元素的样式即可，下面是实例：<br>假设外框元素为<code>.wrap</code>，需要fixed定位的元素为<code>.position</code>：<br><a id="more"></a></p>
<h4 id="DOM"><a href="#DOM" class="headerlink" title="DOM"></a>DOM</h4><figure class="highlight plain"><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></pre></td><td class="code"><pre><span class="line">&lt;html&gt;</span><br><span class="line">    &lt;body class=&quot;wrap&quot;&gt;</span><br><span class="line">        &lt;div class=&quot;position&quot;&gt;</span><br><span class="line">	        &lt;input type=&quot;text&quot; id=&quot;js-searchKey&quot; class=&quot;search-input&quot; placeholder=&quot;关键词搜索&quot;&gt;</span><br><span class="line">        &lt;/div&gt;</span><br><span class="line">    &lt;/body&gt;</span><br><span class="line">&lt;/html&gt;</span><br></pre></td></tr></table></figure>
<h4 id="CSS"><a href="#CSS" class="headerlink" title="CSS"></a>CSS</h4><figure class="highlight plain"><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">body.full-body&#123;</span><br><span class="line">    position: fixed !important;</span><br><span class="line">    top: 0 !important;</span><br><span class="line">    right: 0 !important;</span><br><span class="line">    bottom: 0 !important;</span><br><span class="line">    left: 0 !important;</span><br><span class="line">    width: 100% !important;</span><br><span class="line">    height: 100% !important;</span><br><span class="line">    padding: 0 !important;</span><br><span class="line">    margin: 0 !important;</span><br><span class="line">    overflow: hidden !important;</span><br><span class="line">    -webkit-overflow-scrolling: touch;</span><br><span class="line">&#125;</span><br><span class="line">.fixed-bug&#123;</span><br><span class="line">    position: absolute !important;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<h4 id="JS"><a href="#JS" class="headerlink" title="JS"></a>JS</h4><blockquote>
<p>当input获取焦点，弹出软键盘的时候，就切添加解决bug的class；反之，删除解决bug的class。<br><figure class="highlight plain"><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">function addBodyClass(element)&#123;</span><br><span class="line">    $(&apos;body&apos;).addClass(&apos;full-body&apos;);</span><br><span class="line">    $(element).addClass(&apos;fixed-bug&apos;);</span><br><span class="line">&#125;</span><br><span class="line">function removeBodyClass(element)&#123;</span><br><span class="line">    $(&apos;body&apos;).removeClass(&apos;full-body&apos;);</span><br><span class="line">    $(element).removeClass(&apos;fixed-bug&apos;);</span><br><span class="line">&#125;</span><br><span class="line">$(&quot;#js-searchKey&quot;).on(&apos;focus&apos;,function()&#123;</span><br><span class="line">    var $fixed=$(&apos;.position&apos;);</span><br><span class="line">    addBodyClass($fixed);</span><br><span class="line">&#125;);</span><br><span class="line">$(&quot;#js-searchKey&quot;).on(&apos;blur&apos;,function()&#123;</span><br><span class="line">    var $fixed=$(&apos;.position&apos;);</span><br><span class="line">    removeBodyClass($fixed);</span><br><span class="line">&#125;);</span><br></pre></td></tr></table></figure></p>
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