[转]javascript 之 select下拉框

1.动态创建select

function createSelect(){

var mySelect = document.createElement(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.getElementById('mySelect');

添加一个选项

obj.add(new Option(文本,值));

}

3.删除所有选项option

function removeAll(){

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

obj.options.length=0;

}

4.删除一个选项option

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

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

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

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

function removeSelect(){

var mySelect = document.getElementById(mySelect);

mySelect.parentNode.removeChild(mySelect);

}

转自：http://www.cnblogs.com/rayking/archive/2008/09/03/1282473.html