javascript 之 select下拉框
作者: 羅代均 ldj_work#126.com 轉載請保持完整性
1.動態建立select
function createSelect(){
var mySelect = document.createElement("select");
mySelect.id = "mySelect";
document.body.appendChild(mySelect);
}
2.新增選項option
function addOption(){
//根據id查詢物件,
var obj=document.getElementById('mySelect');
//新增一個選項
obj.add(new Option("文字","值"));
}
3.刪除所有選項option
function removeAll(){
var obj=document.getElementById('mySelect');
obj.options.length=0;
}
4.刪除一個選項option
function removeOne(){
var obj=document.getElementById('mySelect');
//index,要刪除選項的序號,這裡取當前選中選項的序號
var index=obj.selectedIndex;
obj.options.remove(index);
}
5.獲得選項option的值
var obj=document.getElementById('mySelect');
var index=obj.selectedIndex; //序號,取當前選中選項的序號
var val = obj.options[index].value;
6.獲得選項option的文字
var obj=document.getElementById('mySelect');
var index=obj.selectedIndex; //序號,取當前選中選項的序號
var val = obj.options[index].text;
7.修改選項option
var obj=document.getElementById('mySelect');
var index=obj.selectedIndex; //序號,取當前選中選項的序號
var val = obj.options[index]=new Option("新文字","新值");
8.刪除select
function removeSelect(){
var mySelect = document.getElementById("mySelect");
mySelect.parentNode.removeChild(mySelect);
}