1、获取选中select的value和text,html

<select id="mySelect">
<option value="1">one</option>
<option value="2">two</option>
<option value="3">three</option>
</select>


2、运用new Option("文本","值")方法添加选项option

var obj = document.getElementById("mySelect");obj.add(new Option("4","4"));

3、删除所有选项option

var obj = document.getElementById("mySelect");obj.options.length = 0;

4、删除选中选项option

var obj = document.getElementById("mySelect");var index = obj.selectedIndex;obj.options.remove(index);

5、修改选中选项option

var obj = document.getElementById("mySelect");
var index = obj.selectedIndex;
obj.options[index] = new Option("three",3); //更改对应的值
obj.options[index].selected = true; //保持选中状态

6、删除select

var obj = document.getElementById("mySelect");
obj.parentNode.removeChild(obj); //移除当前对象

7、select选择的响应事件

$("#mySelect").change(function(){ //添加所需要执行的操作代码})

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(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
}

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
var index=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]=new Option("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 4.0 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.getElementByIdx_x("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>

 

 


PS:在ie上运行良好，在火狐上调试出现错误，原因如下

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