New to JavaScript

[malickscript]

Hi,
I'm New to java Script ,i need to validate some text field,email field,number filed ,give me some advice to do that,any links to refer any ebooks.

Thanks in advance
Malick

[Twey]

Javascript is not the tool for the job in this case. Validation must be performed server-side (although you may wish to do it on the client as well, for convenience).

[rangana]

I do agree with Twey, but as per request, you can validate a textbox's value if it's a valid email by RegEx:

<script type="text/javascript">
var ray={
checkEmail:function(el)
	{
	alert(/^([a-z0-9])([\w\.\-\+])+([a-z0-9])\@(([\w\-]?)+\.)+([a-z]{2,4})$/i.test(this.returnVal(el))?'Congratulations! It\'s a valid email address':'Sorry, it\'s an invalid email address');
	},
checkNum:function(el)
	{
	// For regex, you can use \d - to test it value is decimal
	alert(!isNaN(Number(this.returnVal(el)))?'It\'s a valid number':'It\'s an invalid number');
	},
returnVal:function(el)
	{
	return document.getElementById(el).value;
	}
}
</script>
<label for="email">Email Address: </label>
<input type="text" id="email"><br>
<label for="number">Number: </label>
<input type="text" id="number"><br>
<input type="button" value="Validate Email" onclick="ray.checkEmail('email')">
<input type="button" value="Validate Number" onclick="ray.checkNum('number')">