JQuery对select的操作

最新推荐文章于 2024-10-22 18:46:48 发布

转载最新推荐文章于 2024-10-22 18:46:48 发布 · 107 阅读

文章标签：

#javascript #java #ViewUI

本文介绍了一个使用JSP技术实现的简单网页示例，通过JavaScript和jQuery进行DOM操作，包括获取下拉框的值、添加和删除选项等。该示例展示了如何在网页上动态地修改下拉框内容。

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<%@ page language="java" import="java.util.*" pageEncoding="gbk"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
    <base href="<%=basePath%>">

    <title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<link rel="stylesheet" media="all" type="text/css" href="/css/screen.css" />
<link rel="stylesheet" media="all" type="text/css" href="/css/examples.css" />
<script type="text/javascript" src="<%=path %>/js/jquery/jquery.js"></script>
<script language="javascript" src="<%=path %>/js/jquery/jquery.select.js"></script>

<script type="text/javascript" src="<%=path %>/js/jquery/effects.core.js"></script>
<script type="text/javascript" src="<%=path %>/js/jquery/effects.highlight.js"></script>
<script type="text/javascript" src="/js/jquery.corner.js"></script>
<script type="text/javascript" src="/js/jquery-impromptu.1.5.js"></script>
<script type="text/javascript" src="/js/common.js"></script>
<script type="text/javascript">
   jQuery(function($)
{
    //获取select文本和值
$("#submitBut").click(function(){
      //注意空格
    //var strText = $("select[@name=fselect] option[@selected]").text();
     // var strValue = $("select[@name=fselect] option[@selected]").val();
      //alert(strText + ":" + strValue);

     /*
     //选中值为t3项
   $("#fselect").attr("value", "t3");
     //选中第二项
   $('#fselect')[0].selectedIndex = 1;
     */
     alert($("#fselect")[0].length);
   });

      //select改变时获取当前选项的值和文本
   $("#fselect").change(function(){
      //获取总的选项
   //alert($(this)[0].length);

      //获取的所有的文本
   var strText = $(this).text();
      //获取当前选中值
   var strValue = $(this).val();
      //alert(strText + ":" + strValue);

      //选中值为t3项
   //选中第二项
   //$(this)[0].selectedIndex = 3;
      //$(this).attr("value", "t3");
      / /$("#fselect")[0].options[2].selected = true;

      //获得当前选中的文本
   //显示索引为2的文本
   var nCurrent = $(this)[0].selectedIndex;
      alert($("#fselect")[0].options[nCurrent].text);
      alert(strValue);
   });

   //增加select
   $("#add").click(function(){
     var nLength = $("#fselect")[0].length;
     var option = document.createElement("option");;
     option.text = "Text" + (nLength+1).toString();
     option.value = "t" + (nLength+1).toString();
     $("#fselect")[0].options.add(option);
     //$("#fselect").addOption("Text" + (nLength+1).toString(), "t" + (nLength+1).toString(), true);
   });

   //清空select
   $("#clear").click(function(){
     $("#fselect").empty();
   });

   //清空一项
$("#remove").click(function(){
     var index = $("#fselect")[0].selectedIndex;
     //$("#fselect")[0].remove(index);
     $("#fselect")[0].options[index] = null;
   });
})

</script>

</head>

<body>
<select name="fselect" id="fselect">
    <option value='t1'>Test1</option>
    <option value='t2'>Test2</option>
    <option value='t3'>Test3</option>
    <option value='t4'>Test4</option>
</select>
<input type="button" name="submitBut" id="submitBut" value="submit" >
<input type="button" name="add" id="add" value="add" >
<input type="button" name="clear" id="clear" value="clear" >
<input type="button" name="remove" id="remove" value="remove" >
</body>

</html>