moxunpw
/
layui_toolnb


			
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<title>镜像站@element模块元素操作文档 - Layui</title>
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                <span>富文本编辑器 </span>
                <span class="layui-font-12 layui-font-gray">layedit</span>
              </a>
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              <a href="flow.html" tppabs="http://www.layui.com/doc/modules/flow.html">
                <span>流加载 </span>
                <span class="layui-font-12 layui-font-gray">flow</span>
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              <a href="util.html" tppabs="http://www.layui.com/doc/modules/util.html">
                <span>工具组件 </span>
                <span class="layui-font-12 layui-font-gray">util</span>
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                <span>代码高亮显示 </span>
                <span class="layui-font-12 layui-font-gray">code</span>
              </a>
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  </div>
  <div class="layui-hide-v"> - </div>
</div>

  
  <div class="layui-col-md9 site-content">
    <h1 class="site-h1"><i class="layui-icon">&#xe62a;</i> 常用元素操作 - layui.element</h1>
    <blockquote class="site-text layui-elem-quote">页面中有许多元素需要自动去完成一些处理，譬如导航菜单的小滑块、Tab 的切换等操作，他们往往不需要去单独调用一个方法来开启一项功能，而页面上恰恰有太多这样的小交互，所以我们统一归类为 element 组件。
    </blockquote>
    <blockquote class="site-text layui-elem-quote">
      模块加载名称：<em>element</em>
    </blockquote>
    
    
    <div class="site-title">
      <fieldset><legend><a name="use">使用</a></legend></fieldset>
    </div>
    <div class="site-text">
      <p>元素功能的开启只需要加载element模块即会自动完成，所以不用跟其它模块一样为某一个功能而调用一个方法。她只需要找到她支持的元素，如你的页面存在一个 Tab元素块，那么element模块会自动赋予她该有的功能。</p>
      <pre class="layui-code" lay-title="HTML">
&lt;div class=&quot;layui-tab&quot; lay-filter="demo"&gt;
  &lt;ul class=&quot;layui-tab-title&quot;&gt;
    &lt;li class=&quot;layui-this&quot;&gt;网站设置&lt;/li&gt;
    &lt;li&gt;商品管理&lt;/li&gt;
    &lt;li&gt;订单管理&lt;/li&gt;
  &lt;/ul&gt;
  &lt;div class=&quot;layui-tab-content&quot;&gt;
    &lt;div class=&quot;layui-tab-item layui-show&quot;&gt;内容1&lt;/div&gt;
    &lt;div class=&quot;layui-tab-item&quot;&gt;内容2&lt;/div&gt;
    &lt;div class=&quot;layui-tab-item&quot;&gt;内容3&lt;/div&gt;
  &lt;/div&gt;
&lt;/div&gt;
      </pre>
      <p>前提是你要加载element模块</p>
      <pre class="layui-code" lay-title="JavaScript">
layui.use('element', function(){
  var element = layui.element;
  
  //一些事件触发
  element.on('tab(demo)', function(data){
    console.log(data);
  });
});
      </pre>
    </div> 
    
    <div class="site-title">
      <fieldset><legend><a name="attr">预设元素属性</a></legend></fieldset>
    </div>
    <div class="site-text">
      <p>我们通过自定义元素属性来作为元素的功能参数，他们一般配置在容器外层，如：</p>
      <pre class="layui-code">
&lt;div class="layui-tab" lay-allowClose="true" lay-filter="demo">…&lt;/div>      
&lt;span class="layui-breadcrumb" lay-separator="|">&lt;/span>
 
 And So On
      </pre>
      <p>element 模块支持的元素如下表：</p>
      <table class="layui-table">
        <thead>
          <tr>
            <th style="width: 100px;">属性名</th>
            <th style="width: 150px;">可选值</th>
            <th>说明</th>
          </tr> 
        </thead>
        <tbody>
          <tr>
            <td>lay-filter</td>
            <td>任意字符</td>
            <td>
              事件过滤器（公用属性），主要用于事件的精确匹配，跟选择器是比较类似的。
            </td>
          </tr>
          <tr>
            <td>lay-allowClose</td>
            <td>
              true
            </td>
            <td>
              针对于Tab容器，是否允许选项卡关闭。默认不允许，即不用设置该属性
            </td>
          </tr>
          <tr>
            <td>lay-separator</td>
            <td>任意分隔符</td>
            <td>针对于面包屑容器</td>
          </tr>
        </tbody>
      </table>
    </div>
    
    <div class="site-title">
      <fieldset><legend><a name="base">基础方法</a></legend></fieldset>
    </div>
    <div class="site-text">
      <p>基础方法允许你在外部主动对元素发起一起操作，目前element模块提供的方法如下：</p>
      <table class="layui-table">
        <thead>
          <tr>
            <th>方法名</th>
            <th>描述</th>
          </tr> 
        </thead>
        <tbody>
          <tr>
            <td>var element = layui.element;</td>
            <td>
              element模块的实例
              <br>返回的<em>element</em>变量为该实例的对象，携带一些用于元素操作的基础方法
            </td>
          </tr>
          <tr>
            <td>element.on(filter, callback);</td>
            <td>
              用于元素的一些事件触发
            </td>
          </tr>
          <tr>
            <td>element.tabAdd(filter, options);</td>
            <td>
              用于新增一个Tab选项
              <br>参数<em>filter</em>：tab元素的 lay-filter="value" 过滤器的值（value）
              <br>参数<em>options</em>：设定可选值的对象，目前支持的选项如下述示例：
              <pre class="layui-code">
element.tabAdd('demo', {
  title: '选项卡的标题'
  ,content: '选项卡的内容' //支持传入html
  ,id: '选项卡标题的lay-id属性值'
});             
              </pre>
            </td>
          </tr>
          <tr>
            <td>element.tabDelete(filter, layid);</td>
            <td>
              用于删除指定的Tab选项
              <br>参数<em>filter</em>：tab元素的 lay-filter="value" 过滤器的值（value）
              <br>参数<em>layid</em>：选项卡标题列表的 属性 lay-id 的值
              <pre class="layui-code" lay-title="示例">
element.tabDelete('demo', 'xxx'); //删除 lay-id="xxx" 的这一项  
              </pre>
            </td>
          </tr>
          <tr>
            <td>element.tabChange(filter, layid);</td>
            <td>
              用于外部切换到指定的Tab项上，参数同上，如：
              <br>element.tabChange('demo', 'layid'); //切换到 lay-id="yyy" 的这一项  
            </td>
          </tr>
          <tr>
            <td>element.tab(options);</td>
            <td>
              用于绑定自定义 Tab 元素（即非 layui 自带的 tab 结构）。<em>该方法为 layui 2.1.6 新增</em>  
              <br>参数<em>options</em>：设定可选值的对象，目前支持的选项如下述示例：
              <pre class="layui-code">
//HTML
&lt;ul id=&quot;tabHeader&quot;&gt;
  &lt;li&gt;标题1&lt;/li&gt;
  &lt;li&gt;标题2&lt;/li&gt;
  &lt;li&gt;标题3&lt;/li&gt;
&lt;/ul&gt;
&lt;div id=&quot;tabBody&quot;&gt;
  &lt;div class=&quot;xxx&quot;&gt;内容1&lt;/div&gt;
  &lt;div class=&quot;xxx&quot;&gt;内容2&lt;/div&gt;
  &lt;div class=&quot;xxx&quot;&gt;内容4&lt;/div&gt;
&lt;/div&gt;
              
//JavaScript              
element.tab({
  headerElem: '#tabHeader>li' //指定tab头元素项
  ,bodyElem: '#tabBody>.xxx' //指定tab主体元素项
});             
              </pre>
            </td>
          </tr>
          <tr>
            <td>element.progress(filter, percent);</td>
            <td>
              用于动态改变进度条百分比：
              <br>element.progress('demo', '30%');
            </td>
          </tr>
        </tbody>
      </table>
    </div>
    
    <a name="init">更新渲染</a>
    <div class="site-title">
      <fieldset><legend><a name="render">更新渲染</a></legend></fieldset>
    </div>
    <div class="site-text">
      <p>跟表单元素一样，很多时候你的页面元素可能是动态生成的，这时element的相关功能将不会对其有效，你必须手工执行 <em>element.init(type, filter)</em> 方法即可。注意：2.1.6 开始，可以用 <em>element.render(type, filter);</em> 方法替代</p>
      <p>第一个参数：type，为表单的type类型，可选。默认对全部类型的表单进行一次更新。可局部刷新的type如下表：</p>
      <table class="layui-table">
        <thead>
          <tr>
            <th>参数（type）值</th>
            <th>描述</th>
          </tr> 
        </thead>
        <tbody>
          <tr>
            <td>tab</td>
            <td>重新对tab选项卡进行初始化渲染</td>
          </tr>
          <tr>
            <td>nav</td>
            <td>重新对导航进行渲染</td>
          </tr>
          <tr>
            <td>breadcrumb</td>
            <td>重新对面包屑进行渲染</td>
          </tr>
          <tr>
            <td>progress</td>
            <td>重新对进度条进行渲染</td>
          </tr>
          <tr>
            <td>collapse</td>
            <td>重新对折叠面板进行渲染</td>
          </tr>
        </tbody>
      </table>
      
      <pre class="layui-code" lay-title="例子">
element.init(); //更新全部  2.1.6 可用 element.render() 方法替代
element.render('nav'); //重新对导航进行渲染。注：layui 2.1.6 版本新增
//……
      </pre>
      
      <p>第二个参数：filter，为元素的 lay-filter="" 的值。你可以借助该参数，完成指定元素的局部更新。</p>
      <pre class="layui-code">
【HTML】
&lt;div class=&quot;layui-nav&quot; lay-filter=&quot;test1&quot;&gt;
  …
&lt;/div&gt;
 
&lt;div class=&quot;layui-nav&quot; lay-filter=&quot;test2&quot;&gt;
  …
&lt;/div&gt;
      
【JavaScript】
//比如当你对导航动态插入了二级菜单，这时你需要重新去对它进行渲染
element.render('nav', 'test1'); //对 lay-filter="test1" 所在导航重新渲染。注：layui 2.1.6 版本新增
//……      
      </pre>
      
    </div>
    
    <div class="site-title">
      <fieldset><legend><a name="on">事件触发</a></legend></fieldset>
    </div>
    <div class="site-text">
      <p>语法：<em>element.on('event(过滤器值)', callback);</em></p>
      <p>element 模块在 layui 事件机制中注册了element 模块事件，所以当你使用 layui.onevent() 自定义模块事件时，请勿占用 element 名。目前 element 模块所支持的事件如下表：</p>
      <table class="site-table">
        <thead>
          <tr>
            <th>event</th>
            <th>描述</th>
          </tr> 
        </thead>
        <tbody>
          <tr>
            <td>tab</td>
            <td>触发 Tab 选项卡切换事件</td>
          </tr>
          <tr>
            <td>tabDelete</td>
            <td>触发 Tab 选项卡删除事件</td>
          </tr>
          <tr>
            <td>nav</td>
            <td>触发导航菜单的点击事件</td>
          </tr>
          <tr>
            <td>collapse</td>
            <td>触发折叠面板展开或收缩事件</td>
          </tr>
        </tbody>
      </table>
      <p>默认情况下，事件所触发的是全部的元素，但如果你只想触发某一个元素，使用事件过滤器即可。<br>如：<em>&lt;div class="layui-tab" lay-filter="test">&lt;/div></em></p>
      <pre class="layui-code">
element.on('tab(test)', function(data){
  console.log(data);
});
      </pre>
    </div>
    
    <div class="site-title">
      <fieldset><legend><a name="ontab">触发选项卡切换</a></legend></fieldset>
    </div>
    <div class="site-text">
      <p>Tab选项卡点击切换时触发，回调函数返回一个object参数，携带两个成员：</p>
      <pre class="layui-code">
element.on('tab(filter)', function(data){
  console.log(this); //当前Tab标题所在的原始DOM元素
  console.log(data.index); //得到当前Tab的所在下标
  console.log(data.elem); //得到当前的Tab大容器
});
      </pre>
    </div>
    
    <div class="site-title">
      <fieldset><legend><a name="ontabDelete">触发选项卡删除</a></legend></fieldset>
    </div>
    <div class="site-text">
      <p>Tab选项卡被删除时触发，回调函数返回一个object参数，携带两个成员：</p>
      <pre class="layui-code">
element.on('tabDelete(filter)', function(data){
  console.log(this); //当前Tab标题所在的原始DOM元素
  console.log(data.index); //得到当前Tab的所在下标
  console.log(data.elem); //得到当前的Tab大容器
});
      </pre>
      <p><em>注：该事件为 layui 2.1.6 新增</em></p>
    </div>
    
    <fieldset class="layui-elem-field layui-field-title site-title">
      <legend><a name="onnav">触发导航菜单的点击</a></legend>
    </fieldset>
    <div class="site-text">
      <p>当点击导航父级菜单和二级菜单时触发，回调函数返回所点击的菜单DOM对象：</p>
      <pre class="layui-code">
element.on('nav(filter)', function(elem){
  console.log(elem); //得到当前点击的DOM对象
});
      </pre>
    </div>
    
    <fieldset class="layui-elem-field layui-field-title site-title">
      <legend><a name="collapse">触发折叠面板</a></legend>
    </fieldset>
    <div class="site-text">
      <p>当折叠面板点击展开或收缩时触发，回调函数返回一个object参数，携带三个成员：</p>
      <pre class="layui-code">
element.on('collapse(filter)', function(data){
  console.log(data.show); //得到当前面板的展开状态，true或者false
  console.log(data.title); //得到当前点击面板的标题区域DOM对象
  console.log(data.content); //得到当前点击面板的内容区域DOM对象
});
      </pre>
    </div>
    
    <div class="site-title">
      <fieldset><legend><a name="progress">动态操作进度条</a></legend></fieldset>
    </div>
    <div class="site-text">
      <p>你肯定不仅仅是满足于进度条的初始化显示，通常情况下你需要动态改变它的进度值，element模块提供了这样的基础方法：<em>element.progress(filter, percent);</em>。</p>
      <pre class="layui-code" lay-title="例子">
&lt;div class=&quot;layui-progress layui-progress-big&quot; lay-filter=&quot;demo&quot; lay-showPercent=&quot;true&quot;&gt;
  &lt;div class=&quot;layui-progress-bar&quot; lay-percent=&quot;0%&quot;&gt;&lt;/div&gt;
&lt;/div&gt;
 
上述是一个已经设置了过滤器（lay-filter=&quot;demo&quot;）的进度条
现在你只需要在某个事件或者语句中执行方法：element.progress(&#x27;demo&#x27;, &#x27;50%&#x27;);
即可改变进度
      </pre>
      <p>如果你需要进度条更直观的例子，建议浏览：<a href="../../demo/progress.html" tppabs="http://www.layui.com/demo/progress.html">进度条演示页面</a></p>
    </div>
    
    <div class="site-title">
      <fieldset><legend><a name="other">结语</a></legend></fieldset>
    </div>
    <div class="site-text">
      <p>事实上元素模块的大部分操作都是内部自动完成的，所以目前你发现他的接口很少呢。当然，我们也会不断增加element模块所支持的页面元素。</p>
    </div>
    
    <div class="layui-elem-quote">
  <p>layui - 在每一个细节中，用心与你沟通</p>
</div>
    
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