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);
- }
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: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><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">
- 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>