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js 操作select的option

javascriptselectoption 
阅读更多 
注意:Option中的O是要大写的，不然语法报错 

1.动态创建select

Javascript代码 
function createSelect(){   
   
Select = document.createElement("select");   
    mySelect.id = "mySelect";    
    document.body.appendChild(mySelect);   
}   


2.添加选项option

Javascript代码 
     function addOption(){   
   
          //根据id查找对象，   
           var obj=document.getElementById('mySelect');   
   
           //添加一个选项   
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   
     }   


---------------------------------------------------------------- 
Option里面的四个参数分别的意思 

new   Option   (text,value,defaultselected,selected)   
new   Option   (文本,值,默认选中的选项,选中的选项) 

看测试结果就懂了  
  <select   id="s1"></select>  
   
  <script>  
      var   op   =   new   Option("显示文本1","值1",false,false);  
      s1.options.add(op);  
      op   =     new   Option("显示文本2","值2",false,true);  
      s1.options.add(op);  
  </script> 
----------------------------------------------------------------- 

3.删除所有选项option

Javascript代码 
     function removeAll(){   
           var obj=document.getElementById('mySelect');   
obj.options.length=0;   
   
     }   


4.删除一个选项option

Javascript代码 
function removeOne(){   
           var obj=document.getElementById('mySelect');   
   
           //index,要删除选项的序号，这里取当前选中选项的序号   
   
var index=obj.selectedIndex;   
obj.options.remove(index);   
     }   


5.获得选项option的值

Javascript代码 
var obj=document.getElementById('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

Javascript代码 
var obj=document.getElementById('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

Javascript代码 
var obj=document.getElementById('mySelect');   
   
var index=obj.selectedIndex; //序号，取当前选中选项的序号   
   
var val = obj.options[index]=new Option("新文本","新值");   


8.删除select

Javascript代码 
      function removeSelect(){   
            var mySelect = document.getElementById("mySelect");   
mySelect.parentNode.removeChild(mySelect);   
     }   




整个实例的完整代码如下：

Javascript代码 
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//ZH-CN" "http://www.w3.org/TR/html4/strict.dtd">   
<html>   
<head>   
   <meta http-equiv="Content-Type" content="text/html">   
<head>   
   <script language=JavaScript>   
    function $(id)   
    {   
     return document.getElementById(id)   
    }   
    function show()   
    {   
     var selectObj=$("area")   
     var myOption=document.createElement("option")   
     myOption.setAttribute("value","10")   
     myOption.appendChild(document.createTextNode("上海"))   
     var myOption1=document.createElement("option")   
     myOption1.setAttribute("value","100")   
     myOption1.appendChild(document.createTextNode("南京"))   
     selectObj.appendChild(myOption)   
     selectObj.appendChild(myOption1)   
    }   
    function choice()   
    {   
     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("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("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"))   
      $("context").appendChild(nj)   
     }   
    }   
    function calc()   
    {   
     var x=$("context").childNodes.length-1;   
     alert(x)   
    }   
    function remove()   
    {   
     var i=$("context").childNodes.length-1;   
     var remobj=$("context").childNodes[i];   
     remobj.removeNode(true)   
    }   
   </script>   
<body>   
<div id="context">   
   <select id="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

Javascript代码 
function watch_ini(){ // 初始   
for(var i=0; i<arguments.length; i++){   
var word = document.createElement("OPTION");   
word.text = arguments[i];   
watch.keywords.add(word); // watch. is form name   
}   
}   
function watch_add(f){ // 增加   
var word = document.createElement("OPTION");   
word.text = f.word.value;   
f.keywords.add(word);   
}   

但上述 add() 方法只在IE下有效，为兼容FF和Opera，对上述代码进行了一下改进，改动后代码如下： function watch_ini(){ // 初始 

Javascript代码 
for(var i=0; i<arguments.length; i++){   
   var oOption=new Option(arguments[i],arguments[i]);   
   document.getElementById("MySelect")[i]=oOption;   
}   
}   
function watch_add(f){ // 增加   
   var oOption=new Option(f.word.value,f.word.value);   
   f.keywords[f.keywords.length]=oOption;   
}   



整个实例的完整代码如下：

Javascript代码 
<!doctype html public "-//w3c//dtd html 4.0 transitional//en">   
<html>   
<head>   
<title>javascript select options text value</title>   
<meta name="keywords" content="javascript select options text value add modify delete set">   
<meta name="description" content="javascript select options text value add modify delete set">   
<script language="javascript">   
<!--   
function watch_ini(){ // 初始   
for(var i=0; i<arguments.length; i++){   
   var oOption=new Option(arguments[i],arguments[i]);   
   document.getElementById("MySelect")[i]=oOption;   
}   
}   
function watch_add(f){ // 增加   
   var oOption=new Option(f.word.value,f.word.value);   
   f.keywords[f.keywords.length]=oOption;   
}   
function watch_sel(f){ // 编辑   
f.word.value = f.keywords[f.keywords.selectedIndex].text;   
}   
function watch_mod(f){ // 修改   
f.keywords[f.keywords.selectedIndex].text = f.word.value;   
}   
function watch_del(f){ // 删除   
f.keywords.remove(f.keywords.selectedIndex);   
}   
function watch_set(f){ // 保存   
var set = "";   
for(var i=0; i<f.keywords.length; i++){   
set += f.keywords[i].text + ";";   
}   
confirm(set);   
}   
//-->   
</script>   
</head>   
<body>   
<form name="watch" method="post" action="">   
<select id="MySelect" name="keywords" size="10" onchange="watch_sel(this.form)"></select><br>   
<script language="javascript">   
<!--   
watch_ini("我","你","妳","他","她","它","尔"); // 初始关键词   
//-->   
</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>   
</body>   
</html>


本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/yefengzhixia/archive/2009/04/17/4087284.aspx
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