[转帖]js 操作select和option常见用法
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 ：js 操作select和option常见用法 js 操作select和option常见用法1、获取选中select的value和text,html <select id="myselect"> <option value="1">one</option> <option value="2">two</option> <option value="3">three</option> </select> 通过以下script代码s来获取选中的value和text $("#myselect").val(); //获取选中记录的value值$("#myselect option:selected").text(); //获取选中记录的text值2、运用new Option("文本","值")方法添加选项option var obj = document.getElementById("myselect");obj.add(new Option("4","4"));3、删除所有选项option var obj = document.getElementById("myselect");obj.options.length = 0;4、删除选中选项option var obj = document.getElementById("myselect");var index = obj.selectedIndex;obj.options.remove(index);5、修改选中选项option var obj = document.getElementById("myselect");var index = obj.selectedIndex;
obj.options[index] = new Option("three",3); //更改对应的值obj.options[index].selected = true; //保持选中状态6、删除select var obj = document.getElementById("myselect");
obj.parentNode.removeChild(obj); //移除当前对象7、select选择的响应事件 $("#myselect").change(function(){ //添加所需要执行的操作代码})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 1 function watch_ini(){ // 初始 2 for(var i=0; i<arguments.length; i++){ 3 var word = document.createElement_x("OPTION"); 4 word.text = arguments[i]; 5 watch.keywords.add(word); // watch. is form name 6 } 7 } 8 function watch_add(f){ // 增加 9 var word = document.createElement_x("OPTION");10 word.text = f.word.value;11 f.keywords.add(word);12 }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： 1 function watch_ini(){ // 初始 2 for(var i=0; i<arguments.length; i++){ 3 var oOption=new Option(arguments[i],arguments[i]); 4 document.getElementByIdx_x("Myselect")[i]=oOption; 5 } 6 } 7 function watch_add(f){ // 增加 8 var oOption=new Option(f.word.value,f.word.value); 9 f.keywords[f.keywords.length]=oOption;10 }整个实例的完整代码如下： 1 <!doctype html public "-//w3c//dtd html 4.0 transitional//en"> 2 <html> 3 <head> 4 <title>javascript select options text value</title> 5 <meta name="keywords" content="javascript select options text value add modify delete set"> 6 <meta name="description" content="javascript select options text value add modify delete set"> 7 <script language="javascript"> 8 <!-- 9 function watch_ini(){ // 初始10 for(var i=0; i<arguments.length; i++){11 var oOption=new Option(arguments[i],arguments[i]);12 document.getElementByIdx_x("Myselect")[i]=oOption;13 }14 }15 function watch_add(f){ // 增加16 var oOption=new Option(f.word.value,f.word.value);17 f.keywords[f.keywords.length]=oOption;18 }19 function watch_sel(f){ // 编辑20 f.word.value = f.keywords[f.keywords.selectedIndex].text;21 }22 function watch_mod(f){ // 修改23 f.keywords[f.keywords.selectedIndex].text = f.word.value;24 }25 function watch_del(f){ // 删除26 f.keywords.remove(f.keywords.selectedIndex);27 }28 function watch_set(f){ // 保存29 var set = "";30 for(var i=0; i<f.keywords.length; i++){31 set += f.keywords[i].text + ";";32 }33 confirm(set);34 }35 //-->36 </script>37 </head>38 <body>39 <form name="watch" method="post" action="">40 <select id="Myselect" name="keywords" size="10" onchange="watch_sel(this.form)"></select><br>41 <script language="javascript">42 <!--43 watch_ini("我","你","妳","他","她","它","尔"); // 初始关键词44 //-->45 </script>46 <input type="text" name="word" /><br />47 <input type="button" value="增加" onclick="watch_add(this.form);" />48 <input type="button" value="修改" onclick="watch_mod(this.form);" />49 <input type="button" value="删除" onclick="watch_del(this.form);" />50 <input type="button" value="保存" onclick="watch_set(this.form);" />51 </form>用一个字符串创建一个数组方法: 1 <script language="javascript"> 2 </body> 3 </html> 4 <script> 5 function spli(){ 6 datastr="2,2,3,5,6,6"; 7 var str= new Array(); 8 str=datastr.split(","); 9 for (i=0;i<str.length ;i++ )10 { document.write(str[i]+"<br/>"); }11 }12 spli();13 </script>
PS:在ie上运行良好，在火狐上调试出现错误，原因如下 该文章在 2023/7/4 16:09:28 编辑过 |
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