isNan

[d-machine]

Hi,

I try to check if this text field include a number or not.

Where did I go wrong?

<form id="form1" name="form1" method="post" action="">
  Your Number: <input name="input" type="text" id="input" value="0" />
  <br />
  <input name="button" type="submit" id="button" onclick="if (isNanN(document.getElementById('input'))) alert('Please Enter a Valid Number');" value="Submit" />
</form> 

[thetestingsite]

onclick="if (isNanN

should be

onclick="if (isNaN

Hope this helps.

[clueful]

Aside from the syntax error mentioned, you must read the .value property.
That is a weak test since isNaN does not return true for "" or " ". You must test first for the presence of at least one digit:

onclick="if( !/\d/.test( document.getElementById('input').value ) || isNaN(document.getElementById('input').value) ) alert('Please Enter a Valid Number');"

[thetestingsite]

This is very true. Thanks for adding that clueful.

[d-machine]

Thank you both very much!