jQuery issue with chaining isNumeric

Question

I've got a simple conditional that checks if an id is equal to something and also checks if it is a number. I'm also using isNumeric with a combination of .length. But for some reason the isNumeric part is not working as I can enter a string of letters and it doesn't validate. Any ideas?

var $this = $(this);
if(this.id == "userName" && $.isNumeric($this.val()).length < 10 ){
  //do something
}

adeneo · Accepted Answer · 2013-05-13 17:14:17Z

7

The reason you're having problems is that this:

$.isNumeric( $this.val() )

returns true or false, and checking the length of a boolean makes no sense, as true or false will never have a length over 10, as booleans does'nt have a length, and returns "undefined" ?

Maybe you meant this :

if (
    this.id == "userName" 
    && 
    $.isNumeric( $this.val() ) 
    && 
    $this.val().length < 10 
   ){
      // do something if the value is numeric, and the string length is under 10
   }

edited May 13, 2013 at 17:14

answered May 13, 2013 at 16:41

adeneo

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4 Comments

Delmon Young Over a year ago

thanks @adeneo it's odd but I'm still getting the same results. If I input: **$.isNumeric( $this.val() ) ** as a letter it's not validating.

adeneo Over a year ago

Not sure I get it, as a "letter" how exactly. You're only allowing numbers, like 434243 ?

adeneo Over a year ago

Try replacing the isNumeric line with /\D/g.test(this.value)

adeneo Over a year ago

It's a regex to check that the string contains only numbers, the same thing isNumeric is supposed to do internally ?

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