js操作select的option
注意:Option中的O是要大写的，不然语法报错 1.动态创建selectJavascript代码 function createSelect(){ Select = document.createElement("select"); mySelect.id = "mySelect"; document.body.appendChild(mySelect); } 2.添加选项optionJavascript代码 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 } ---------------------------------------------------------------- Option里面的四个参数分别的意思 new Option (text,value,defaultselected,selected) new Option (文本,值,默认选中的选项,选中的选项) 看测试结果就懂了 <select id="s1"></select> <script> var op = new Option("显示文本1","值1",false,false); s1.options.add(op); op = new Option("显示文本2","值2",false,true); s1.options.add(op); </script> ----------------------------------------------------------------- 3.删除所有选项optionJavascript代码 function removeAll(){ var obj=document.getElementById('mySelect'); obj.options.length=0; } 4.删除一个选项optionJavascript代码 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Javascript代码 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.value; 6.获得选项option的文本Javascript代码 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.text; 7.修改选项optionJavascript代码 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=new Option("新文本","新值"); 8.删除selectJavascript代码 function removeSelect(){ var mySelect = document.getElementById("mySelect"); mySelect.parentNode.removeChild(mySelect); } 整个实例的完整代码如下：Javascript代码 <!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.getAttribute("value") if(val==10) { var i=$("context").childNodes.length-1; var remobj=$("context").childNodes; 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; 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; remobj.removeNode(true) } </script> <body> <div id="context"> <select id="area" onchange="choice()"> </select> </div> <input type=button value="显示" > <input type=button value="计算结点" > <input type=button value="删除" > </body> </html> 改进版：在select中添加、修改、删除option元素Javascript代码 function watch_ini(){ // 初始 for(var i=0; i<arguments.length; i++){ var word = document.createElement("OPTION"); word.text = arguments; 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 Javascript代码 for(var i=0; i<arguments.length; i++){ var oOption=new Option(arguments,arguments); document.getElementById("MySelect")=oOption; } } function watch_add(f){ // 增加 var oOption=new Option(f.word.value,f.word.value); f.keywords=oOption; } 整个实例的完整代码如下：Javascript代码 <!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,arguments); document.getElementById("MySelect")=oOption; } } function watch_add(f){ // 增加 var oOption=new Option(f.word.value,f.word.value); f.keywords=oOption; } function watch_sel(f){ // 编辑 f.word.value = f.keywords.text; } function watch_mod(f){ // 修改 f.keywords.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.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"/> <input type="button" value="修改"/> <input type="button" value="删除"/> <input type="button" value="保存"/> </form> </body> </html> 本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/yefengzhixia/archive/2009/04/17/4087284.aspx
页:
[1]