js 操作select和option

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js 操作select和option

1.动态创建select

function createSelect(){

var mySelect = document.createElement_x("select");
         mySelect.id = "mySelect";
         document.body.appendChild(mySelect);
     }

2.添加选项option

function addOption(){

//根据id查找对象，
var obj=document.getElementByIdx_x('mySelect');

          //添加一个选项
obj.add(newOption("文本","值"));   //这个只能在IE中有效
        obj.options.add(new Option("text","value"));//这个兼容IE与firefox
    }

3.删除所有选项option

function removeAll(){
var obj=document.getElementByIdx_x('mySelect');
obj.options.length=0;

}

4.删除一个选项option

function removeOne(){
var obj=document.getElementByIdx_x('mySelect');

//index,要删除选项的序号，这里取当前选中选项的序号

varindex=obj.selectedIndex;
obj.options.remove(index);
}

5.获得选项option的值

var obj=document.getElementByIdx_x('mySelect');

var index=obj.selectedIndex; //序号，取当前选中选项的序号

var val =obj.options[index].value;

6.获得选项option的文本

var obj=document.getElementByIdx_x('mySelect');

var index=obj.selectedIndex; //序号，取当前选中选项的序号

var val =obj.options[index].text;

7.修改选项option

var obj=document.getElementByIdx_x('mySelect');

var index=obj.selectedIndex; //序号，取当前选中选项的序号

var val = obj.options[index]=newOption("新文本","新值");

8.删除select

     function removeSelect(){
           var mySelect = document.getElementByIdx_x("mySelect");
mySelect.parentNode.removeChild(mySelect);
    }

整个实例的完整代码如下：

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//ZH-CN""http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
   <metahttp-equiv="Content-Type"content="text/html">
<head>
   <scriptlanguage=JavaScript>
    function$(id)
    {
    return document.getElementByIdx_x(id)
    }
    functionshow()
    {
    var selectObj=$("area")
    var myOption=document.createElement_x("option")
    myOption.setAttribute("value","10")
    myOption.appendChild(document.createTextNode("上海"))
    var myOption1=document.createElement_x("option")
    myOption1.setAttribute("value","100")
    myOption1.appendChild(document.createTextNode("南京"))
    selectObj.appendChild(myOption)
    selectObj.appendChild(myOption1)
    }
    functionchoice()
    {
    var index=$("area").selectedIndex;
    var val=$("area").options[index].getAttribute("value")
    if(val==10)
    {
     var i=$("context").childNodes.length-1;
    var remobj=$("context").childNodes[i];
    remobj.removeNode(true)
     var sh=document.createElement_x("select")
     sh.add(new Option("浦东新区","101"))
     sh.add(new Option("黄浦区","102"))
     sh.add(new Option("徐汇区","103"))
     sh.add(new Option("普陀区","104"))
     $("context").appendChild(sh)
    }
    if(val==100)
    {
     var i=$("context").childNodes.length-1;
    var remobj=$("context").childNodes[i];
    remobj.removeNode(true)
     var nj=document.createElement_x("select")
     nj.add(new Option("玄武区","201"))
     nj.add(new Option("白下区","202"))
     nj.add(new Option("下关区","203"))
     nj.add(new Option("栖霞区","204"))
     $("context").appendChild(nj)
    }
    }
    functioncalc()
    {
    var x=$("context").childNodes.length-1;
    alert(x)
    }
    functionremove()
    {
    var i=$("context").childNodes.length-1;
    var remobj=$("context").childNodes[i];
    remobj.removeNode(true)
    }
  </script>
<body>
<div id="context">
   <selectid="area" onchange="choice()">
  </select>
</div>
<input type=button value="显示"onclick="show()">
<input type=button value="计算结点"onclick="calc()">
<input type=button value="删除"onclick="remove()">
</body>
</html>

改进版：在select中添加、修改、删除option元素

整个实例的完整代码如下：

<!doctype html public "-//w3c//dtd html 4.0transitional//en">
<html>
<head>
<title>javascript select options textvalue</title>
<meta name="keywords" content="javascript selectoptions text value add modify delete set">
<meta name="description" content="javascript selectoptions text value add modify delete set">
<scriptlanguage="javascript">

</script>
</head>
<body>
<form name="watch" method="post"action="">
<select id="MySelect" name="keywords" size="10"onchange="watch_sel(this.form)"></select><br>
<scriptlanguage="javascript">

</script>
<input type="text" name="word"/><br />
<input type="button" value="增加"onclick="watch_add(this.form);" />
<input type="button" value="修改"onclick="watch_mod(this.form);" />
<input type="button" value="删除"onclick="watch_del(this.form);" />
<input type="button" value="保存"onclick="watch_set(this.form);" />
</form>

用一个字符串创建一个数组方法:

<scriptlanguage="javascript">

</body>
</html>
<script>
function spli(){
datastr="2,2,3,5,6,6";
var str= new Array();
str=datastr.split(",");
for (i=0;i<str.length;i++ )
{ document.write(str[i]+"<br/>"); }
}
spli();
</script
今天调试了一段js，在ie上运行良好，在火狐上调试出现错误，查资料发现
obj.add(new Option("文本","值")); //这个只能在IE中有效
obj.options.add(new Option("text","value"));//这个兼容IE与firefox
因为这段代码，在网上查资料收藏了这篇文章，实时的温故js
共勉！！

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