Javascript Solutions

Get Value or Text from Drop Down List using javascript

Inline code

<select id="ddl1" onchange="getValueOrText(this);">
<option value="0">--Select Color--</option>
<option value="1">--Red--</option>
<option value="2">--Green--</option>
<option value="3">--Blue--</option>
</select>

Javascript Function

<script language="javascript" type="text/javascript">
function getValueOrText(obj)
{
alert('Selected Value is : ' + obj.options[obj.selectedIndex].value);
alert('Selected Text is : ' + obj.options[obj.selectedIndex].innerHTML);
}
</script>


Demo :

--Select Color--
--Red--
--Green--
--Blue--


Set Value to Drop Down List using javscript
Inline code

<select id="ddl2" onchange="getValueOrText(this);">
<option value="0">--Select Color--</option>
<option value="1">--Red--</option>
<option value="2">--Green--</option>
<option value="3">--Blue--</option>
</select>
Enter value: <input type="text" id="txtValue" />
<input id="btnSet" type=button value="Set Value" onclick="return setValue();" />

Javascript function
<script language="javascript" type="text/javascript">
function setValue()
{
var v = document.getElementById('txtValue').value;
var l = document.getElementById('ddl2').options.length;
var obj = document.getElementById('ddl2');
var isMatched=false;
for(var i = 0; i < l; i++)
{
if(obj.options[i].value == v)
{
obj.options[i].selected=true;
isMatched=true;
break;
}
}
isMatched==false?alert('value is invalid!.'):'';
return false;
}
</script>
Demo :

--Select Color--
--Red--
--Green--
--Blue--

Enter value:


Validate Drop Down List using javascript

Inline code

<select id="ddl3" onchange="getValueOrText(this);">
<option value="0">--Select Color--</option>
<option value="1">--Red--</option>
<option value="2">--Green--</option>
<option value="3">--Blue--</option>
</select>

<input type="button" value="Click Me" id="btn" onclick="return DDLvalidate();" />

Javascript function

function DDLvalidate()
{
var obj=document.getElementById('ddl3');
if(obj.options[obj.selectedIndex].value==0)
{
alert('please select color.');
return false;
}else{ alert('valid'); return false; }
}

Demo:

--Select Color--
--Red--
--Green--
--Blue--

function checkEmail(obj)
{
var Regex=/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/;
if (!Regex.test(obj.value))
alert("Invalid E-mail Address! Please re-enter.")
else
alert("valid email address.")
}

Check out Demo

Javascript dost not have for each feature but there is somthing like this.
Check out this function. It is equevalent foreach.

Javascript function

var array=new Object();
array[0]='Me';
array[1]='You';
var a1='Me'; a2='She'
function checkArr()
{
for(a1 in array)
alert('Yes');
for(a2 is array)
alert('No');
return false;
}

Check out demo here.

Demo :