Javascript 操作select控件

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1.判断select选项中是否存在Value="paraValue"的Item

function jsSelectIsExitItem(objSelect, objItemValue) {
var isExit = false;
for (var i = 0; i < objSelect.options.length; i++) {
if (objSelect.options[i].value == objItemValue) {
isExit = true;
break;
}
}
return isExit;
}

2.向select选项中加入一个Item

function jsAddItemToSelect(objSelect, objItemText, objItemValue) {
//判断是否存在
if (jsSelectIsExitItem(objSelect, objItemValue)) {
alert("该Item的Value值已经存在");
} else {
var varItem = new Option(objItemText, objItemValue);
objSelect.options.add(varItem);
alert("成功加入");
}
}

3.从select选项中删除一个Item

function jsRemoveItemFromSelect(objSelect, objItemValue) {
//判断是否存在
if (jsSelectIsExitItem(objSelect, objItemValue)) {
for (var i = 0; i < objSelect.options.length; i++) {
if (objSelect.options[i].value == objItemValue) {
objSelect.options.remove(i);
break;
}
}
alert("成功删除");
} else {
alert("该select中不存在该项");
}
}

4.删除select中选中的项

function jsRemoveSelectedItemFromSelect(objSelect) {
var length = objSelect.options.length - 1;
for(var i = length; i >= 0; i--){
if(objSelect[i].selected == true){
objSelect.options[i] = null;
}
}
}

5.修改select选项中 value="paraValue"的text为"paraText"

function jsUpdateItemToSelect(objSelect, objItemText, objItemValue) {
//判断是否存在
if (jsSelectIsExitItem(objSelect, objItemValue)) {
for (var i = 0; i < objSelect.options.length; i++) {
if (objSelect.options[i].value == objItemValue) {
objSelect.options[i].text = objItemText;
break;
}
}
alert("成功修改");
} else {
alert("该select中不存在该项");
}
}

6.设置select中text="paraText"的第一个Item为选中

function jsSelectItemByValue(objSelect, objItemText) {
//判断是否存在
var isExit = false;
for (var i = 0; i < objSelect.options.length; i++) {
if (objSelect.options[i].text == objItemText) {
objSelect.options[i].selected = true;
isExit = true;
break;
}
}
//Show出结果
if (isExit) {
alert("成功选中");
} else {
alert("该select中不存在该项");
}
}

7.设置select中value="paraValue"的Item为选中

document.all.objSelect.value = objItemValue;

8.得到select的当前选中项的value

var currSelectValue = document.all.objSelect.value;

9.得到select的当前选中项的text

var currSelectText=document.all.objSelect.options[document.all.objSelect.selectedIndex].text;

10.得到select的当前选中项的Index

var currSelectIndex = document.all.objSelect.selectedIndex;

11.清空select的项

document.all.objSelect.options.length = 0;

12.动态创建select

function createSelect(){

var mySelect = document.createElement("select");
mySelect.id = "mySelect";
document.body.appendChild(mySelect);
}

13.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"));
}

14.删除所有选项option

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

15.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);
}

16.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;

17.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;

18.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");

19.删除select

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

测试：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>javascript select结合_脚本之家_www.jb51.net</title>
<script language="javascript" type="text/javascript">

function vtOption(){
var s1=document.getElementById("select1");
var sV=s1.options[s1.selectedIndex].value;
var sT=s1.options[s1.selectedIndex].text;
alert(sV+"\n"+sT);
}

function addOption1(){
var s1=document.getElementById("select1");
var newOp1=new Option;
newOp1.value="3";
newOp1.text="这是3";
var newOp2=new Option;
newOp2.value="4";
newOp2.text="这是4";
s1.add(newOp1);
s1.add(newOp2);
}

function addOption2(){
var s1=document.getElementById("select1");
for(var i=3;i<5;i++){
var newOp1=new Option("这是"+i,i);
//var newOp1=new Option;
//newOp1.value=i;
//newOp1.text="这是"+i;
s1.add(newOp1);
}
}

function addOption3(){
var s1=document.getElementById("select1");
s1.options.length=0;//清除以前的选项
for(var i=3;i<7;i++){
var newOp1=new Option("这是"+i,i);
//var newOp1=new Option;
//newOp1.value=i;
//newOp1.text="这是"+i;
s1.add(newOp1);
}
}

function remOption(){
var s1=document.getElementById("select1");
for(var i=s1.options.length;i>=0;i--){
s1.options.remove(i);
}
}

function remOptionSelected(){
var s1=document.getElementById("select1");
var i=s1.selectedIndex;
//alert(i);
s1.options.remove(i);
}
</script>
</head>

<body>
<select name="select" id="select1">
<option value="1">这是1</option>
<option value="2">这是2</option>
</select>

<a href="javascript:vtOption()">取值</a> <a href="javascript:addOption1()">增加1</a> <a href="javascript:addOption2()">增加2</a> <a href="javascript:addOption3()">增加3</a> <a href="javascript:remOption()">删除选项</a>
<a href="javascript:remOptionSelected()">删除选取选项</a>
</body>
</html>