js动态添加option

来源：互联网发布：360软件管家编辑：程序博客网时间：2024/05/16 04:49

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>JS动态添加删除option</title>
<script>
//动态删除select中的所有options：
function delAllOptions(){
document.getElementById("user_dm").options.length=0;
}

//动态删除select中的某一项option：
function delOneOption(indx){
document.getElementById("user_dm").options.remove(indx);
}

// 动态添加select中的项option:
function addOneOption(){
      //document.getElementById("user_dm").options.add(new Option(2,"mytest"));

   var selectObj=document.getElementById("user_dm");
   alert(selectObj.length);
   selectObj.options[selectObj.length] = new Option("mytest", "2");
}
</script>
</head>
<body>
<select id="user_dm" name="user_dm">
<option value="0" selecte>==请选择人员==</option>
<option value="1">test</option>
</select><br>
<input type="button" onClick="addOneOption()" value="添加">
<input type="button" onClick="delOneOption(1)" value="删除第一个">
<input type="button" onClick="delAllOptions()" value="清空">
</body>
</html>

//查询option的文本

var obj = document.getElementById("fmaleHuKou");
var txt = obj.options[obj.selectedIndex].text;
alert(txt);

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>Js动态添加与删除Option对象</TITLE>
<script language="JavaScript">
// 添加选项
function addOption(pos){
var objSelect=document.getElementById("mySelect");
    // 取得字段值
   //var strName = document.myForm.myOptionName.value;
    // var strValue = document.myForm.myOptionValue.value;
    // 建立Option对象
    var objOption = new Option("aaaaaaaa","bbbbbbbbb");
    if (pos == -1 & pos > objSelect.options.length)
       objSelect.options[objSelect.options.length] = objOption;
    else
       objSelect.add(objOption, pos);
}

// 删除
function deleteOption(type){
var objSelect=document.getElementById("mySelect");
    if (type == true)
       objSelect.options[objSelect.selectedIndex] = null;
    else
       objSelect.remove(objSelect.selectedIndex);
}
// 显示选项信息
function showOption(){
var objSelect=document.getElementById("mySelect");
    var name = objSelect.options[objSelect.selectedIndex].text;
    var value = objSelect.options[objSelect.selectedIndex].value;
    alert(name + " = " + value);
}

//动态删除select中的所有options：
function clearAllOptions(){
var objSelect=document.getElementById("mySelect");
objSelect.options.length=0;
}
</script>
</HEAD>
<BODY>
<h2>Js动态添加与删除Option对象</h2>
<hr>

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