原生动态创建select的方案--兼容IE

一个兼容到IE的动态创建select的方案。

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
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);
}

整个实例的完整代码如下:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//ZH-CN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html">
<head>
<script language=JavaScript>
function $(id) {
return document.getElementById(id);
}
function show() {
var selectObj = $("area");
var myOption = document.createElement("option");
myOption.setAttribute("value", "10");
myOption.appendChild(document.createTextNode("上海"));
var myOption1 = document.createElement("option");
myOption1.setAttribute("value", "100");
myOption1.appendChild(document.createTextNode("南京"));
selectObj.appendChild(myOption);
selectObj.appendChild(myOption1);
}
function choice() {
var index = $("area").selectedIndex;
var val = $("area").options[index].getAttribute("value")
if (val == 10) {
var i = $("context").childNodes.length - 1;
var remobj = $("context").childNodes[i];
remobj.removeNode(true)
var sh = document.createElement("select")
sh.add(new Option("浦东新区","101"))
sh.add(new Option("黄浦区", "102"))
sh.add(new Option("徐汇区", "103"))
sh.add(new Option("普陀区", "104"))
$("context").appendChild(sh)
}
else if (val == 100) {
var i = $("context").childNodes.length - 1;
var remobj = $("context").childNodes[i];
remobj.removeNode(true);
var nj = document.createElement("select");
nj.add(new Option("玄武区", "201"));
nj.add(new Option("白下区", "202"));
nj.add(new Option("下关区", "203"));
nj.add(new Option("栖霞区","204"));
$("context").appendChild(nj);
}
}
function calc() {
var x = $("context").childNodes.length - 1;
alert(x)
}
function remove() {
var i = $("context").childNodes.length - 1;
var remobj = $("context").childNodes[i];
remobj.removeNode(true)
}
</script>
<body>
<div id="context">
<select id="area" onchange="choice()"> </select>
</div>
<input type=button value="显示" onclick="show()">
<input type=button value="计算结点" onclick="calc()">
<input type=button value="删除" onclick="remove()">
</body>
</html>

改进版:在select中添加、修改、删除option元素

function watch_ini() {
// 初始
for (var i = 0; i < arguments.length; i++) {
var word = document.createElement("OPTION");
word.text = arguments[i];
watch.keywords.add(word); // watch. is form name
}
}
function watch_add(f){
// 增加
var word=document.createElement("OPTION");
word.text = f.word.value;
f.keywords.add(word);
}
// 但上述 add() 方法只在IE下有效, 为兼容FF和Opera, 对上述代码进行了一下改进, 改动后代码如下:
function watch_ini() {
// 初始
for(var i = 0; i < arguments.length; i++){
var oOption = new Option(arguments[i],arguments[i]);
document.getElementById("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;
}

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.getElementById("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>
<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>
</body>
</html>

今天调试了一段js,在ie上运行良好,在火狐上调试出现错误,查资料发现

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

因为这段代码,在网上查资料收藏了这篇文章,实时的温故共勉!!
本文来源于博客园,因收藏时间较长,暂无法确定原作者,欢迎原作者在本文留言并声明原文网址。

NOOLDEY

本文作者:NOOLDEY

做一个诗情画意的码农,皮皮猪,我们走!

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