<script type="text/javascript">
// 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("mySelect");
mySelect.parentNode.removeChild(mySelect);
}
</script> <!--//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)
}
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：--> <script type="text/javascript">
//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;
}
</script> <!--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><br>
<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> <script>
//用一个字符串创建一个数组方法:
function spli() {
datastr = "2,2,3,5,6,6";
varstr = newArray();
str = datastr.split(",");
for(i = 0; i < str.length; i++) {
document.write(str[i] + "<br/>");
}
}
spli();
</script>