javascript string length returning undefined

Question

I cant seem to get a string length from a value in a form textfield Here's the code for my function, its getting passed the parameter of the textfields name

  function validate(thing)
  {

  var location = document.getElementById(thing);

  var cardst = location.value;
  window.alert (cardst);
  cardst = String(cardst);
  window.alert (cardst.lenght);

the first alert works, it alerts whatever I type into the textfield, but the second one is always undefined. As you can see I did cast it as a string but I get get undefined.. ANy ideas??

Typo: cardst.lenght should be cardst.length; Also, not sure of the reason for creating a new string. — Cᴏʀʏ
– Cᴏʀʏ, Commented Jun 4, 2012 at 22:08
Using "location" as variable name is a bad idea. How do you call your function? — Oliver
– Oliver, Commented Jun 4, 2012 at 22:09

Cameron · Accepted Answer · 2012-06-04 22:08:23Z

15

That would be because you misspelled length :-)

Use this instead:

cardst.length;   // <- 'th', not 'ht'

answered Jun 4, 2012 at 22:08

Cameron

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Comments

Pablo Mescher · Accepted Answer · 2012-06-04 22:09:34Z

2

You have a syntax error. It's length not lenght

   function validate(thing)
  {

  var location = document.getElementById(thing);

  var cardst = location.value;
  window.alert (cardst);
  cardst = String(cardst);
  window.alert (cardst.lenght);
                           ^ /*should read window.alert(cardst.length)*/

answered Jun 4, 2012 at 22:09

Pablo Mescher

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1 Comment

Pablo Mescher Over a year ago

try ctrl+shift+j on most browsers

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