时间：2021-07-01 10:21:17 帮助过：2人阅读
function getvalue(obj)
{
var m=obj.options[obj.selectedIndex].value
alert(m);//获取value
var n=obj.options[obj.selectedIndex].text
alert(n);//获取文本
}
=======================================
1 检测是否有选中
代码如下:
if (objSelect.selectedIndex > - 1 ) {
// 说明选中
} else {
// 说明没有选中
}
2 删除被选中的项
objSelect.options[objSelect.selectedIndex] = null ;
3 增加项
objSelect.options[objSelect.length] = new Option( " 你好 " , " hello " );
4 修改所选择中的项
objSelect.options[objSelect.selectedIndex] = new Option( " 你好 " , " hello " );
5 得到所选择项的文本
objSelect.options[objSelect.selectedIndex].text;
6 得到所选择项的值
objSelect.options[objSelect.selectedIndex].value;
=======================================
代码如下:
<%@LANGUAGE="VBSCRIPT" CODEPAGE="936"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>JS对select动态添加options操作[IE和FireFox兼容]</title>
<script language="javascript" type="text/javascript">
function xlbchange(s){
switch (s){
case "1" :
document.getElementById("lb").options.length=0;
var soojs_value=[0,1,2,3];
var soojs_text=["精神提炼","作风设计","目标设置","理念提升"];
for ( var i=0;i<soojs_value.length;i++){
var oOption = document.createElement("OPTION");
oOption.value=soojs_value[i];
oOption.text=soojs_text[i];
zpmange.lb.options.add(oOption);
}
break;
case "2" :
document.getElementById("lb").options.length=0;
var soojs_value=[0,1,2,3,4,5,6,7];
var soojs_text=["校徽","校训","校歌","校名字体","校史展室","宣传画册","宣传光盘","办公用品纪念品"];
for ( var i=0;i<soojs_value.length;i++){
var oOption = document.createElement("OPTION");
oOption.value=soojs_value[i];
oOption.text=soojs_text[i];
zpmange.lb.options.add(oOption);
}
break;
case "3":
document.getElementById("lb").options.length=0;
var soojs_value=[0,1,2,3];
var soojs_text=["校园景观设计","校园雕塑设计","校园浮雕设计","走廊文化设计"];
for ( var i=0;i<soojs_value.length;i++){
var oOption = document.createElement("OPTION");
oOption.value=soojs_value[i];
oOption.text=soojs_text[i];
zpmange.lb.options.add(oOption);
}
break;
case "4":
document.getElementById("lb").options.length=0;
var soojs_value=[0,1,2];
var soojs_text=["学校制度","文化活动","行为规范"];
for ( var i=0;i<soojs_value.length;i++){
var oOption = document.createElement("OPTION");
oOption.value=soojs_value[i];
oOption.text=soojs_text[i];
zpmange.lb.options.add(oOption);
}
break;
default :
document.getElementById("lb").options.length=0;
var oOption = document.createElement("OPTION");
oOption.value=0;
oOption.text="请选择作品类别";
zpmange.lb.options.add(oOption);
}
}
</script>
</head>
<body>
<form action="zpmange.asp" name="zpmange" method="post">
<p><select id="ddlResourceType" onchange="getvalue(this)"><br />
</select></p>
<p> 动态删除select中的所有options： <br />
document.getElementById("ddlResourceType").options.length=0; <br />
<br />
动态删除select中的某一项option： <br />
document.getElementById("ddlResourceType").options.remove(indx); </p>
<p> 动态添加select中的项option: <br />
document.getElementById("ddlResourceType").options.add(new Option(text,value)); </p>
<p> 上面在IE和FireFox都能测试成功，希望以后你可以用上。 <br />
其实用标准的DOM操作也可以，就是document.createElement，appendChild，removeChild之类的。 </p>
<p>取值方面<br />
function getvalue(obj)<br />
{<br />
var m=obj.options[obj.selectedIndex].value<br />
alert(m);//获取value<br />
var n=obj.options[obj.selectedIndex].text<br />
alert(n);//获取文本<br />
}<br />
</p>
<p>例子：</p>
<table width="80%" border="0" align="center" cellpadding="1" cellspacing="1" style="border-style:double">
<tr>
<td width="50%" height="41" ><div align="center">
<select name="xt" id="xt" onchange="xlbchange(this.value)">
<option selected="selected">请选择作品系统</option>
<option value="1">理念视别系统</option>
<option value="2">视觉识别系统</option>
<option value="3">环境视别系统</option>
<option value="4">行为视别系统</option>
</select>
</div></td>
<td width="61%" ><div align="center">
<select name="lb" id="lb">
<option selected="selected">请选择作品类别</option>
</select>
</div></td>
</tr>
<tr>
<td height="203" colspan="2" > </td>
</tr>
</table>
</form>
</body>
</html>