1.动态创建select
function createSelect(){ var mySelect = document.createElement_x("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.getElementByIdx_x('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.getElementByIdx_x('mySelect'); obj.options.length=0; }
4.删除一个选项option
function removeOne(){ var obj=document.getElementByIdx_x('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.getElementByIdx_x('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.getElementByIdx_x('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.getElementByIdx_x('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.getElementByIdx_x("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 $(id)
{
return document.getElementByIdx_x(id)
}
function show()
{
var selectObj=$("area")
var myOption=document.createElement_x("option")
myOption.setAttribute("value","10")
myOption.appendChild(document.createTextNode("上海"))
var myOption1=document.createElement_x("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_x("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_x("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_x("OPTION"); word.text = arguments[i]; watch.keywords.add(word); // watch. is form name } } function watch_add(f){ // 增加 var word = document.createElement_x("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.getElementByIdx_x("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.getElementByIdx_x("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>
用一个字符串创建一个数组方法:
<script language="javascript"> </body> </html> <script> function spli(){ datastr="2,2,3,5,6,6"; var str= new Array(); str=datastr.split(","); for (i=0;i<str.length ;i++ ) { document.write(str[i]+"<br/>"); } } spli(); </script 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