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jQuery implements select drop-down box to obtain the currently selected text

小云云Original: 2018-01-12 10:28:163410browse

This article mainly introduces the relevant knowledge of jQuery to implement the select drop-down box to obtain the currently selected text, value, index and add/delete the Option items of Select. It has a good reference value. Let's take a look with the editor below, I hope it can help everyone.

Without further ado, please take a look at the code:

//直接保存后缀.htnl用谷歌浏览器打开，亲测有效
<head>
<script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script>
<script>
 $(function(){
  //为Select添加事件，当选择其中一项时触发
  $("select:eq(0)").change(function(){
   //code
  });
  //获取Select选中的Text:结果是由所有匹配元素包含的文本内容组合起来的文本
  var checkText = $("select:eq(0) :selected").text();//建议用这个简单
     = $("select:eq(0) option:selected").tetx();
     = $("#One").find(":selected").text();
     = $("#One").find("option:selected").text();
 //如果多选，将返回一个数组，其包含所选的值。
  var checkValue = $("#select_id").val();
 //获取Select选中匹配元素的当前值,即[即使多选也只]取得第一个匹配元素的val内容
  var checkValue = $("select:eq(0) :selected").val();//=========强烈建议用这个，以防多选
  //获取Select选中的索引值
  var checkIndex = $("#select_id ").get(0).selectedIndex; 
  //获取Select最大的索引值 
  var maxIndex = $("#select_id :last").prop("index"); //建议用这个
     = $("#select_id option:last").prop("index"); 
     = $("select:eq(0)").find(":last").prop("index")
     = $("select:eq(0)").find("option:last").prop("index")
 //=========================================================================================
 //jQuery设置Select选择的 Text和Value:
 // 设置Select的Value值为4的项选中
 $("#select_id ").val(4); //用这个 
 $("#select_id [value=&#39;4&#39;]").prop("selected", true);
 $("#select_id option[value=&#39;4&#39;]").prop("selected", true);
 //设置select中的第一个option被选中
 $("select :first").prop("selected", true);//这个
 $("select :first").prop("selected", &#39;selected&#39;); 
 $("select option:first").prop("selected", "true"); 
 $("select option:first").prop("selected", "selected"); 
 //============================================================================================
 //jQuery添加/删除Select的Option项
 $("#select_id").append("<option value=&#39;Value&#39;>Text</option>"); //为Select末尾追加一个Option(下拉项)
 $("#select_id").prepend("<option value=&#39;0&#39;>请选择</option>"); //为Select首部插入一个Option(第一个位置)
 $("#select_id :last").remove(); //删除Select中索引值最大Option(最后一个)
 $("#select_id :fist").remove(); //删除Select中索引值最小为0Option(第一个)
 $("#select_id [value=&#39;3&#39;]").remove(); //删除Select中Value=&#39;3&#39;的Option
 });
 </script>
</head>
<table>
 <tr>
   <td>
    <!--multiple设定下拉框可以多选，size设定下拉框不呈现下拉方式，-->
    <select size="12" id="One" multiple="multiple">
     <option value=&#39;1&#39;>苹果</option>
     <option value="2">香蕉</option>
     <option value="3">草莓</option>
     <option value="4">橘子</option>
    </select>
   </td>
   <td>
     <input type="button" value=">>>"><br>
     <input type="button" value=" > "><br>
     <input type="button" value=" < "><br>
     <input type="button" value="<<<"><br>
   </td>
   <td>
     <select size="12" id="two" multiple="multiple">
      <option value="5">葡萄</option>
     </select>
   </td>
   <td>
     <input type="button" value=" up "><br><br>
     <input type="button" value="down"><br>
   </td>
 </tr>
</table>

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