validation on textarea to allow only characters no numbers!

[saravanataee]

Dear all,

I have having a text area field which has a limit of 100 characters only. Now, i also want to validate it such that it should only contain letter's (alphabet A-Z .a-z). It should not contain any number or @ symbol. If such things entered it should throw me an error saying invalid arguments like that.

 

I know it can be done with regular expressions. But i m not aware of how to do.

 

Can some one help with that.

 

Here is my script.

 

<script language="javascript" type="text/javascript">
function limitText(limitField, limitCount, limitNum) {
if (limitField.value.length > limitNum) {
	 limitField.value = limitField.value.substring(0, limitNum);
} else {
	 limitCount.value = limitNum - limitField.value.length;
}
}

</script>
<tr>
<td valign="top" align="left">Description</td>
<td valign="top">:</td>
<td align="left"><textarea name="limitedtextarea" onkeydown="limitText(this.form.limitedtextarea,this.form.countdown,100);"
onkeyup="limitText(this.form.limitedtextarea,this.form.countdown,100);">
</textarea><br>
<font size="1">(Maximum characters: 100)<br>
You have <input readonly type="text" name="countdown" size="3" value="100"> characters left.</font></td>
</tr>

[requinix]

Take a quick look at documentation for regular expressions in Javascript. The MDN is a good place to check for examples.

 

Once you know about the .test() method you can use

/^[a-zA-Z]{0,100}$/

That will also validate the length.

[saravanataee]

Hi requinix,

Thanks for the reply. But i want to know the way i can apply the method into my textarea. Since i m not that expert, i want your help in that.

 

Just show me the javascript function which can be called to test it..

 

Thanks!

[requinix]

I told you where to look, hoping that you didn't need a link to click on. Have you been able to find anything? The point is to get you to learn a bit so you don't have to rely on others.