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" οnchange="choice()"></select></div><input type=button value="显示" οnclick="show()"><input type=button value="计算结点" οnclick="calc()"><input type=button value="删除" οnclick="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" οnchange="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" οnclick="watch_add(this.form);" /><input type="button" value="修改" οnclick="watch_mod(this.form);" /><input type="button" value="删除" οnclick="watch_del(this.form);" /><input type="button" value="保存" οnclick="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>
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