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jquery 操作select下拉列表的一些实例

WBOY
Release: 2016-06-01 09:54:47
Original
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本文章需要使用到的html: 

<code class="language-html"><select id="test">
    <option value="1">php</option>
<option>
    </option>
<option value="2">mysql</option>
<option>
    </option>
<option value="n">java</option>
<option>
</option></select></code>
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jquery获取select第一个option的值

<code class="language-javascript">$('#test option:first').val();</code>
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jquery获取select最后一个option的值

<code class="language-javascript">$('#test option:last').val();</code>
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jquery获取select第二个option的值

<code class="language-javascript">$('#test option:eq(1)').val();</code>
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jquery获取select选中的值

<code class="language-javascript">$('#test').val();
或
$('#test option:selected').val();</code>
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jquery设置select值为"php"的option为选中状态

<code class="language-javascript">$('#test').attr('value','php');</code>
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jquery设置select最后一个option为选中

<code class="language-javascript">$('#test option:last').attr('selected','selected');</code>
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jquery获取select的长度

<code class="language-javascript">$('#test option').length;</code>
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jquery为select添加一个option

<code class="language-javascript">$("#test").append("<option value="javascript">javascript</option>");
或
$("<option value="javascript">javascript</option>").appendTo("#test");</code>
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jquery移除select选中项

<code class="language-javascript">$('#test option:selected').remove();</code>
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jquery删除select某一项(这里删除第一项)

<code class="language-javascript">$('#test option:first').remove();</code>
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jquery指定值删除select中的option项

<code class="language-javascript">$('#test option').each(function(){
    if( $(this).val() == '5'){
         $(this).remove();
     }
});
$('#test option[value=5]').remove();</code>
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获取第一个Group的标签

<code class="language-javascript">$('#test optgroup:eq(0)').attr('label');</code>
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获取第二group下面第一个option的值

<code class="language-javascript">$('#test optgroup:eq(1) : option:eq(0)').val();</code>
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