獲取select選定的元素
var Obj = document.getElementById("selectID");
Obj.option[Obj.selectedIndex].value
如何用Javascript的內置函數把以逗號分開的字符串轉化成一個數組。然后輸出數組。
<script>
str="a,b,c"
arr=str.split(",");
for(i=0;i<arr.length;i++)alert(i+":"+arr[i])
</script>
如何用自己寫的函數把以逗號分開的字符串轉化成一個數組。然后輸出數組。
<script>
str="o,m,n"
arr=split2(str);
for(i=0;i<arr.length;i++)alert(i+":"+arr[i])
function split2(tmp){
return tmp.match(/([^,]+)/g)
}
</script>
Example:
<html>
<head>
<title></title>
<script language="javascript">
function Add(objA,objB)
{
var tem=new Array();
with(objA)
for(i=length-1;i>=0;i--)
if(options[i].selected){tem[tem.length]=new Option(options[i].text,options[i].value);}
if(objA.selectedIndex>-1)
{
for(i=0;i<objB.length;i++) tem[tem.length]=objB.options[i];
with(objB)
{
length=0;
tem.sort(sortArr);
for(i=0;i<tem.length;i++) options[length]=new Option(tem[i].text,tem[i].value)
}
}
}
function sortArr(a,b)
{
if(a.text>b.text)return 1;
if(a.text<b.text)return -1;
return 0;
}
//
//
function up(obj)
{
var objO = new Option(obj.options[obj.selectedIndex].text,obj.options[obj.selectedIndex].value);
var selectedIndex = obj.selectedIndex;
if(selectedIndex>0)
{
obj.options[selectedIndex].text = obj.options[selectedIndex-1].text;
obj.options[selectedIndex].value = obj.options[selectedIndex-1].value;
obj.options[selectedIndex-1].text = objO.text;
obj.options[selectedIndex-1].value = objO.value;
obj.selectedIndex = selectedIndex-1;
}
}
//
//
function down(obj)
{
var objO = new Option(obj.options[obj.selectedIndex].text,obj.options[obj.selectedIndex].value);
var selectedIndex = obj.selectedIndex;
if(selectedIndex<obj.options.length-1)
{
obj.options[selectedIndex].text = obj.options[selectedIndex+1].text;
obj.options[selectedIndex].value = obj.options[selectedIndex+1].value;
obj.options[selectedIndex+1].text = objO.text;
obj.options[selectedIndex+1].value = objO.value;
obj.selectedIndex = selectedIndex+1;
}
}
//
// 雙擊時添加到b
function dba(objA,objB)
{
var objO=new Option(objA.options[objA.selectedIndex].text,objA.options[objA.selectedIndex].value)
objB.add(objO);
}
//
// 雙擊時刪除b
function dbb(obj)
{
obj.removeChild(obj.options[obj.selectedIndex]);
}
//
// 刪除b中選中的項
function del(obj)
{
for(var i=obj.options.length-1;i>=0;i--)
{
if(obj.options[i].selected)
{
obj.removeChild(obj.options[i]);
}
}
}
//
//
function getvalue(obj)
{
var str="";
for(var i=0;i<obj.options.length;i++)
{
if(str.length>0)
str = str + "," + obj.options[i].value;
else
str = obj.options[i].value;
}
document.getElementById("selectValue").innerText = str;
}
//
</script>
</head>
<body bgcolor="#CCCCCC">
<table cellspacing="0" cellpadding="0" width="448" border="0">
<tr>
<td width="45%" align="center">
<select style="width: 155px" multiple size="15" name="a" ondblclick="dba(this,document.getElementById('b'))">
<option value="av1" title="av1">at1</option>
<option value="av2" title="av2" style="background-color:#999999">at2</option>
<option value="av3" title="av3">at3</option>
<option value="av4" title="av4">at4</option>
<option value="av5" title="av5">at5</option>
<option value="av6" title="av6">at6</option>
<option value="av7" title="av7">at7</option>
</select>
</td>
<td>
<input onClick="Add(document.getElementById('a'),document.getElementById('b'))" type="button"
value=">>" style="width: 40px">
<br>
<input onClick="del(document.getElementById('b'))" type="button" value="Del" style="width: 40px">
<br>
<input onClick="up(document.getElementById('b'))" type="button" value="b↑" style="width: 40px">
<br>
<input onClick="down(document.getElementById('b'))" type="button" value="b↓" style="width: 40px">
</td>
<td width="45%" align="center">
<select style="width: 155px" multiple size="15" name="b" ondblclick="dbb(this)">
<option value="bv1">bt1</option>
<option value="bv2">bt2</option>
<option value="bv3">bt3</option>
<option value="bv4">bt4</option>
<option value="bv5">bt5</option>
<option value="bv6">bt6</option>
<option value="bv7">bt7</option>
<option value="bv8">bt8</option>
</select>
</td>
</tr>
<tr>
<td colspan="3" align="center">
<input type="button" name="button1" value="獲得右邊select值" onClick="getvalue(document.getElementById('b'))"></td>
</tr>
<tr>
<td colspan="3" align="center">
<div id="selectValue">
</div>
</td>
</tr>
</table>
</body>
</html>