javascript input mask

[paulanthony]

I have a competition entry that must be in the format
3 characters then 4 numbers.

Anyone any ideas how to validate via javascript for this or to go about creating an input mask for this?

[RonPK]

You can match the entry against a regular expression pattern.

<script type="text/javascript"> 
function checkEntry(val) { 
 if (!val.match(/^[a-z]{3}[0-9]{4}$/i)) { 
  alert('no good.'); 
  return false; 
 } 
 return true; 
} 
</script> 
<form onsubmit="return checkEntry(this.entry.value)"> 
 <input type="text" name="entry"> 
 <input type="submit"> 
</form> 

[visionmonster]

glad RonPK did the heavy lifting on that one,

if you want the letters to be case insensitive you might need to tweak it a little from: [a-z] to [a-zA-Z]

some good reading
[regular-expressions.info...]

[paulanthony]

Appreciate that chaps. Thanks.

[RonPK]

if you want the letters to be case insensitive

Hey, I did think of that ;) That is what the letter

i

after the pattern is for:

/^[a-z]{3}[0-9]{4}$/i