• js 操作select和option

    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
 
function watch_ini(){ // 初始
 for(var i=0; i<arguments.length; i++){
 var word = document.createElement_x("OPTION");
 word.text = arguments[i];
 watch.keywords.add(word); // watch. is form name
 }
 }
 function watch_add(f){ // 增加
 var word = document.createElement_x("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.getElementByIdx_x("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.getElementByIdx_x("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">   
 </body>
 </html>
 <script>
 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 
今天调试了一段js，在ie上运行良好，在火狐上调试出现错误，查资料发现
 
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
 
因为这段代码，在网上查资料收藏了这篇文章，实时的温故js
 
共勉！！

    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

    function watch_ini(){ // 初始
    for(var i=0; i<arguments.length; i++){
    var word = document.createElement_x("OPTION");
    word.text = arguments[i];
    watch.keywords.add(word); // watch. is form name
    }
    }
    function watch_add(f){ // 增加
    var word = document.createElement_x("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.getElementByIdx_x("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.getElementByIdx_x("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">

    1. < /body>
      < /html>
    2. < script>
    3. function spli(){
    4. datastr="2,2,3,5,6,6";
    5. var str= new Array();
    6. str=datastr.split(",");
    7. for (i=0;i<str.length ;i++ )
    8. { document.write(str[i]+"<br/>"); }
    9. }
    10. spli();
    11. </script

      今天调试了一段js，在ie上运行良好，在火狐上调试出现错误，查资料发现

      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

      因为这段代码，在网上查资料收藏了这篇文章，实时的温故js

      共勉！！
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  • 原文地址：https://www.cnblogs.com/henuyuxiang/p/5761441.html
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