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1.动态创建select<br /> function createSelect(){<br /> var mySelect = document.createElement("select");<br /> mySelect.id = "mySelect";<br /> document.body.appendChild(mySelect);<br /> }<br /> 2.添加选项option<br /> function addOption(){<br /> //根据id查找对象，<br /> var obj=document.getElementById('mySelect');<br /> //添加一个选项<br /> obj.add(new Option("文本","值")); //这个只能在IE中有效<br /> obj.options.add(new Option("text","value")); //这个兼容IE与firefox<br /> }<br /> 3.删除所有选项option<br /> function removeAll(){<br /> var obj=document.getElementById('mySelect');<br /> obj.options.length=0;<br /> }<br /> 4.删除一个选项option<br /> function removeOne(){<br /> var obj=document.getElementById('mySelect');<br /> //index,要删除选项的序号，这里取当前选中选项的序号<br /> var index=obj.selectedIndex;<br /> obj.options.remove(index);<br /> }<br /> 5.获得选项option的值<br /> var obj=document.getElementById('mySelect');<br /> var index=obj.selectedIndex; //序号，取当前选中选项的序号<br /> var val = obj.options[index].value;<br /> 6.获得选项option的文本<br /> var obj=document.getElementById('mySelect');<br /> var index=obj.selectedIndex; //序号，取当前选中选项的序号<br /> var val = obj.options[index].text;<br /> 7.修改选项option<br /> var obj=document.getElementById('mySelect');<br /> var index=obj.selectedIndex; //序号，取当前选中选项的序号<br /> var val = obj.options[index]=new Option("新文本","新值");<br /> 8.删除select<br /> function removeSelect(){<br /> var mySelect = document.getElementById("mySelect");<br /> mySelect.parentNode.removeChild(mySelect);<br /> }<br /> 整个实例的完整代码如下：<br /> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//ZH-CN" "http://www.w3.org/TR/html4/strict.dtd"><br /> <html><br /> <head><br /> <meta http-equiv="Content-Type" content="text/html"><br /> <head><br /> <mce:script language=JavaScript><!--<br /> function $(id)<br /> {<br /> return document.getElementById(id)<br /> }<br /> function show()<br /> {<br /> var selectObj=$("area")<br /> var myOption=document.createElement("option")<br /> myOption.setAttribute("value","10")<br /> myOption.appendChild(document.createTextNode("上海"))<br /> var myOption1=document.createElement("option")<br /> myOption1.setAttribute("value","100")<br /> myOption1.appendChild(document.createTextNode("南京"))<br /> selectObj.appendChild(myOption)<br /> selectObj.appendChild(myOption1)<br /> }<br /> function choice()<br /> {<br /> var index=$("area").selectedIndex;<br /> var val=$("area").options[index].getAttribute("value")<br /> if(val==10)<br /> {<br /> var i=$("context").childNodes.length-1;<br /> var remobj=$("context").childNodes[i];<br /> remobj.removeNode(true)<br /> var sh=document.createElement("select")<br /> sh.add(new Option("浦东新区","101"))<br /> sh.add(new Option("黄浦区","102"))<br /> sh.add(new Option("徐汇区","103"))<br /> sh.add(new Option("普陀区","104"))<br /> $("context").appendChild(sh)<br /> }<br /> if(val==100)<br /> {<br /> var i=$("context").childNodes.length-1;<br /> var remobj=$("context").childNodes[i];<br /> remobj.removeNode(true)<br /> var nj=document.createElement("select")<br /> nj.add(new Option("玄武区","201"))<br /> nj.add(new Option("白下区","202"))<br /> nj.add(new Option("下关区","203"))<br /> nj.add(new Option("栖霞区","204"))<br /> $("context").appendChild(nj)<br /> }<br /> }<br /> function calc()<br /> {<br /> var x=$("context").childNodes.length-1;<br /> alert(x)<br /> }<br /> function remove()<br /> {<br /> var i=$("context").childNodes.length-1;<br /> var remobj=$("context").childNodes[i];<br /> remobj.removeNode(true)<br /> }</p> <p>// --></mce:script><br /> <body><br /> <div id="context"><br /> <select id="area" onchange="choice()"><br /> </select><br /> </div><br /> <input type=button value="显示" onclick="show()"><br /> <input type=button value="计算结点" onclick="calc()"><br /> <input type=button value="删除" onclick="remove()"><br /> </body><br /> </html><br /> 改进版：在select中添加、修改、删除option元素<br /> function watch_ini(){ // 初始<br /> for(var i=0; i<arguments.length; i++){<br /> var word = document.createElement("OPTION");<br /> word.text = arguments[i];<br /> watch.keywords.add(word); // watch. is form name<br /> }<br /> }<br /> function watch_add(f){ // 增加<br /> var word = document.createElement("OPTION");<br /> word.text = f.word.value;<br /> f.keywords.add(word);<br /> }<br /> 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<br /> for(var i=0; i<arguments.length; i++){<br /> var oOption=new Option(arguments[i],arguments[i]);<br /> document.getElementById("MySelect")[i]=oOption;<br /> }<br /> }<br /> function watch_add(f){ // 增加<br /> var oOption=new Option(f.word.value,f.word.value);<br /> f.keywords[f.keywords.length]=oOption;<br /> }</p> <p>整个实例的完整代码如下：<br /> <!doctype html public "-//w3c//dtd html 4.0 transitional//en"><br /> <html><br /> <head><br /> <title>javascript select options text value</title><br /> <meta name="keywords" content="javascript select options text value add modify delete set"><br /> <meta name="description" content="javascript select options text value add modify delete set"><br /> <mce:script language="javascript"><!--<br /> function watch_ini(){ // 初始<br /> for(var i=0; i<arguments.length; i++){<br /> var oOption=new Option(arguments[i],arguments[i]);<br /> document.getElementById("MySelect")[i]=oOption;<br /> }<br /> }<br /> function watch_add(f){ // 增加<br /> var oOption=new Option(f.word.value,f.word.value);<br /> f.keywords[f.keywords.length]=oOption;<br /> }<br /> function watch_sel(f){ // 编辑<br /> f.word.value = f.keywords[f.keywords.selectedIndex].text;<br /> }<br /> function watch_mod(f){ // 修改<br /> f.keywords[f.keywords.selectedIndex].text = f.word.value;<br /> }<br /> function watch_del(f){ // 删除<br /> f.keywords.remove(f.keywords.selectedIndex);<br /> }<br /> function watch_set(f){ // 保存<br /> var set = "";<br /> for(var i=0; i<f.keywords.length; i++){<br /> set += f.keywords[i].text + ";";<br /> }<br /> confirm(set);<br /> }<br /> // --></mce:script><br /> </head><br /> <body><br /> <form name="watch" method="post" action=""><br /> <select id="MySelect" name="keywords" size="10" onchange="watch_sel(this.form)"></select><br><br /> <mce:script language="javascript"><!--<br /> watch_ini("我","你","妳","他","她","它","尔"); // 初始关键词<br /> // --></mce:script><br /> <input type="text" name="word" /><br /><br /> <input type="button" value="增加" onclick="watch_add(this.form);" /><br /> <input type="button" value="修改" onclick="watch_mod(this.form);" /><br /> <input type="button" value="删除" onclick="watch_del(this.form);" /><br /> <input type="button" value="保存" onclick="watch_set(this.form);" /><br /> </form><br /> </body><br /> </html>
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