js 操作select和option

本文轉載自查看原文 2016-08-11 16:19 3582 Jquery、Js相關

1.動態創建select
 
     function createSelect(){
 
var mySelect = document.createElement_x("select");
           mySelect.id = "mySelect"; 
           document.body.appendChild(mySelect);
       }
 
2.添加選項option
 
     function addOption(){
 
          //根據id查找對象，
            var obj=document.getElementByIdx_x('mySelect');
 
           //添加一個選項
 obj.add(new Option("文本","值"));    //這個只能在IE中有效
          obj.options.add(new Option("text","value")); //這個兼容IE與firefox
      }
 
3.刪除所有選項option
 
     function removeAll(){
            var obj=document.getElementByIdx_x('mySelect');
 obj.options.length=0;
 
     }
 
4.刪除一個選項option
 
function removeOne(){
            var obj=document.getElementByIdx_x('mySelect');
 
           //index,要刪除選項的序號，這里取當前選中選項的序號
 
var index=obj.selectedIndex;
 obj.options.remove(index);
      }
 
5.獲得選項option的值
 
var obj=document.getElementByIdx_x('mySelect');
 
var index=obj.selectedIndex; //序號，取當前選中選項的序號
 
var val = obj.options[index].value;
 
6.獲得選項option的文本
 
var obj=document.getElementByIdx_x('mySelect');
 
var index=obj.selectedIndex; //序號，取當前選中選項的序號
 
var val = obj.options[index].text;
 
7.修改選項option
 
var obj=document.getElementByIdx_x('mySelect');
 
var index=obj.selectedIndex; //序號，取當前選中選項的序號
 
var val = obj.options[index]=new Option("新文本","新值");
 
8.刪除select
 
      function removeSelect(){
             var mySelect = document.getElementByIdx_x("mySelect");
 mySelect.parentNode.removeChild(mySelect);
      }
 
 
 
整個實例的完整代碼如下：
 
<!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("浦東新區","101"))
       sh.add(new Option("黃浦區","102"))
       sh.add(new Option("徐匯區","103"))
       sh.add(new Option("普陀區","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("玄武區","201"))
       nj.add(new Option("白下區","202"))
       nj.add(new Option("下關區","203"))
       nj.add(new Option("棲霞區","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="顯示" onclick="show()">
 <input type=button value="計算結點" onclick="calc()">
 <input type=button value="刪除" onclick="remove()">
 </body>
 </html>
 
 
 
改進版：在select中添加、修改、刪除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，為兼容FF和Opera，對上述代碼進行了一下改進，改動后代碼如下： 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;
 }
 

整個實例的完整代碼如下：
 
<!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){ // 編輯
 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){ // 刪除
 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","爾"); // 初始關鍵詞
 //-->
 </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="刪除" onclick="watch_del(this.form);" />
 <input type="button" value="保存" onclick="watch_set(this.form);" />
 </form>
 
用一個字符串創建一個數組方法:
 
<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 
今天調試了一段js，在ie上運行良好，在火狐上調試出現錯誤，查資料發現
 
obj.add(new Option("文本","值"));    //這個只能在IE中有效
          obj.options.add(new Option("text","value")); //這個兼容IE與firefox
 
因為這段代碼，在網上查資料收藏了這篇文章，實時的溫故js
 
共勉！！

1.動態創建select

function createSelect(){

var mySelect = document.createElement_x("select");
mySelect.id = "mySelect";
document.body.appendChild(mySelect);
}

2.添加選項option

function addOption(){

//根據id查找對象，
var obj=document.getElementByIdx_x('mySelect');

//添加一個選項
obj.add(new Option("文本","值")); //這個只能在IE中有效
obj.options.add(new Option("text","value")); //這個兼容IE與firefox
}

3.刪除所有選項option

function removeAll(){
var obj=document.getElementByIdx_x('mySelect');
obj.options.length=0;

}

4.刪除一個選項option

function removeOne(){
var obj=document.getElementByIdx_x('mySelect');

//index,要刪除選項的序號，這里取當前選中選項的序號

var index=obj.selectedIndex;
obj.options.remove(index);
}

5.獲得選項option的值

var obj=document.getElementByIdx_x('mySelect');

var index=obj.selectedIndex; //序號，取當前選中選項的序號

var val = obj.options[index].value;

6.獲得選項option的文本

var obj=document.getElementByIdx_x('mySelect');

var index=obj.selectedIndex; //序號，取當前選中選項的序號

var val = obj.options[index].text;

7.修改選項option

var obj=document.getElementByIdx_x('mySelect');

var index=obj.selectedIndex; //序號，取當前選中選項的序號

var val = obj.options[index]=new Option("新文本","新值");

8.刪除select

function removeSelect(){
var mySelect = document.getElementByIdx_x("mySelect");
mySelect.parentNode.removeChild(mySelect);
}

整個實例的完整代碼如下：

< !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("浦東新區","101"))
sh.add(new Option("黃浦區","102"))
sh.add(new Option("徐匯區","103"))
sh.add(new Option("普陀區","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("玄武區","201"))
nj.add(new Option("白下區","202"))
nj.add(new Option("下關區","203"))
nj.add(new Option("棲霞區","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="顯示"onclick="show()">
<input type=button value="計算結點"onclick="calc()">
< input type=button value="刪除"onclick="remove()">
< /body>
< /html>

改進版：在select中添加、修改、刪除option元素

整個實例的完整代碼如下：

< !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){ // 編輯
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){ // 刪除
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","爾"); // 初始關鍵詞
//-->
< /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="刪除"onclick="watch_del(this.form);" />
< input type="button" value="保存"onclick="watch_set(this.form);" />
< /form>

用一個字符串創建一個數組方法:

< /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
今天調試了一段js，在ie上運行良好，在火狐上調試出現錯誤，查資料發現

obj.add(new Option("文本","值")); //這個只能在IE中有效
obj.options.add(new Option("text","value")); //這個兼容IE與firefox

因為這段代碼，在網上查資料收藏了這篇文章，實時的溫故js

共勉！！

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