JS动态添加option和删除option

1.动态创建select

function createSelect(){

var mySelect = document.createElement("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.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
     }

3.删除所有选项option

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

}

4.删除一个选项option

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

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[index].value;

6.获得选项option的文本

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[index].text;

7.修改选项option

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[index]=new Option("新文本","新值");

8.删除select

      function removeSelect(){
            var mySelect = document.getElementById("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 $(id)
    {
     return document.getElementById(id)
    }
    function show()
    {
     var selectObj=$("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[index].getAttribute("value")
     if(val==10)
     {
      var i=$("context").childNodes.length-1;
     var remobj=$("context").childNodes[i];
     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[i];
     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[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

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">

</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">

</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:

</body>
</html> <script>functionspli(){datastr="2,2,3,5,6,6"; varstr=newArray(); str=datastr.split(","); for(i=0;i<str.length ;i++ ) {document.write(str[i]+"<br/>"); } } spli(); </script> -- 来源于互联网http://apps.hi.baidu.com/share/detail/31091794

二

</select>

动态删除select中的所有options：

document.getElementById("ddlResourceType").options.length=0;

动态删除select中的某一项option：

document.getElementById("ddlResourceType").options.remove(indx);

动态添加select中的项option:

document.getElementById("ddlResourceType").options.add(new Option(text,value));

上面在IE和FireFox都能测试成功，希望以后你可以用上。

其实用标准的DOM操作也可以，就是document.createElement，appendChild，removeChild之类的。

取值方面

function getvalue(obj)

{

var m=obj.options[obj.selectedIndex].value

alert(m);//获取value

var n=obj.options[obj.selectedIndex].text

alert(n);//获取文本

}

==============================================================================

1 检测是否有选中

if (objSelect.selectedIndex > - 1 ) {

// 说明选中

} else {

// 说明没有选中

}

2 删除被选中的项

objSelect.options[objSelect.selectedIndex] = null ;

3 增加项

objSelect.options[objSelect.length] = new Option( " 你好 " , " hello " );

4 修改所选择中的项

objSelect.options[objSelect.selectedIndex] = new Option( " 你好 " , " hello " );

5 得到所选择项的文本

objSelect.options[objSelect.selectedIndex].text;

6 得到所选择项的值

objSelect.options[objSelect.selectedIndex].value;

======================================================================

<%@LANGUAGE="VBSCRIPT" CODEPAGE="936"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<head>

<title>JS对select动态添加options操作[IE和FireFox兼容]</title>

function xlbchange(s){

switch (s){

case "1" :

document.getElementById("lb").options.length=0;

var soojs_value=[0,1,2,3];

var soojs_text=["精神提炼","作风设计","目标设置","理念提升"];

for ( var i=0;i<soojs_value.length;i++){

var oOption = document.createElement("OPTION");

oOption.value=soojs_value[i];

oOption.text=soojs_text[i];

zpmange.lb.options.add(oOption);

}

break;

case "2" :

document.getElementById("lb").options.length=0;

var soojs_value=[0,1,2,3,4,5,6,7];

var soojs_text=["校徽","校训","校歌","校名字体","校史展室","宣传画册","宣传光盘","办公用品纪念品"];

for ( var i=0;i<soojs_value.length;i++){

var oOption = document.createElement("OPTION");

oOption.value=soojs_value[i];

oOption.text=soojs_text[i];

zpmange.lb.options.add(oOption);

}

break;

case "3":

document.getElementById("lb").options.length=0;

var soojs_value=[0,1,2,3];

var soojs_text=["校园景观设计","校园雕塑设计","校园浮雕设计","走廊文化设计"];

for ( var i=0;i<soojs_value.length;i++){

var oOption = document.createElement("OPTION");

oOption.value=soojs_value[i];

oOption.text=soojs_text[i];

zpmange.lb.options.add(oOption);

}

break;

case "4":

document.getElementById("lb").options.length=0;

var soojs_value=[0,1,2];

var soojs_text=["学校制度","文化活动","行为规范"];

for ( var i=0;i<soojs_value.length;i++){

var oOption = document.createElement("OPTION");

oOption.value=soojs_value[i];

oOption.text=soojs_text[i];

zpmange.lb.options.add(oOption);

}

break;

default :

document.getElementById("lb").options.length=0;

var oOption = document.createElement("OPTION");

oOption.value=0;

oOption.text="请选择作品类别";

zpmange.lb.options.add(oOption);

}

</script>

</head>

<body>

</select></p>

<p> 动态删除select中的所有options： <br />

document.getElementById("ddlResourceType").options.length=0; <br />

<br />

动态删除select中的某一项option： <br />

document.getElementById("ddlResourceType").options.remove(indx); </p>

<p> 动态添加select中的项option: <br />

document.getElementById("ddlResourceType").options.add(new Option(text,value)); </p>

<p> 上面在IE和FireFox都能测试成功，希望以后你可以用上。 <br />

其实用标准的DOM操作也可以，就是document.createElement，appendChild，removeChild之类的。 </p>

function getvalue(obj)<br />

{<br />

var m=obj.options[obj.selectedIndex].value<br />

alert(m);//获取value<br />

var n=obj.options[obj.selectedIndex].text<br />

alert(n);//获取文本<br />

}<br />

</p>

<tr>

<option selected="selected">请选择作品系统</option>

<option value="1">理念视别系统</option>

<option value="2">视觉识别系统</option>

<option value="3">环境视别系统</option>

<option value="4">行为视别系统</option>

</select>

</div></td>

<option selected="selected">请选择作品类别</option>

</select>

</div></td>

</tr>

<tr>

</tr>

</table>

</form>

</body>

</html>

posted on 2014-11-14 15:57 尼欧阅读(947) 评论(0) 编辑收藏举报