Checking for Whitespace

[GavW]

Hey all.

I would like to know how to write form validation which will not allow whitespace to be included in a text box and return an error if the user attempts to submit the form whilst there is a space in the text box.

I am pretty new to javascript and cant seem to find sample code that will do this.

Thanks in advance

 

[jemminger]

here's a simple function using a regular expression:

function has_whitespace(str) {
  return /\s/.test(str);
}

you can call it from your form validation:

function validate(form) {
  if (has_whitespace(form.myfield.value)) {
    alert('whitespace not allowed');
    return false;
  }
}

be sure to return false upon error in your validation function, and also have your form's onsubmit handler expect a return value to stop submission when false.

<form onsubmit='return validate(this);'>
 <input name='myfield' />
 <input type='submit' />
</form>

-jeff

http://www.jeffemminger.com

lost: one sig, last seen here.

 

[GavW]

thanks a lot mate. Works perfect.