Javascript操作Select和Option

时间:2013.3.5 编辑: 叶建勇 阅读量:2923 全屏

//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")); //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.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
}
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