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javascript function to allow 2 or 3 numeric

Posted on 2010-09-21
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Last Modified: 2012-06-21
Is there a java script function if I allowed 2 digit numbers and if I hit or added 3 digit numbers can i get a popup saying allow or disallow for example.
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Question by:Seven price
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7 Comments
 
LVL 4

Expert Comment

by:ronan1979
ID: 33729753
use the handler "onChange" and then check the length of the string
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LVL 41

Accepted Solution

by:
HonorGod earned 2000 total points
ID: 33730273
Something like this perhaps?
<html>
<head>
<script type='text/javascript'>
  function verify( obj ) {
    var val = obj.value;
    if ( /^\d{2}$/.test( val ) ) {
      alert( 'Good: "' + val + '"' );
    } else {
      alert( 'Invalid: "' + val + '"' );
    }
  }
</script>
</head>
<body>
2 digit number: <input type='text' onblur='verify(this)'>
</body>
</html>

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LVL 82

Expert Comment

by:leakim971
ID: 33730689
<< if I hit >> 

I would replace line 15 of @HonorGod's code by :


2 digit number: <input type='text' onkeyup='verify(this)' onclick='verify(this)' >

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LVL 22

Expert Comment

by:kadaba
ID: 33731448
If the idea is to disallow anything greater than 2 digit numbers, then simply add the max length property to the text box to 2 i.e maxlength = 2 and save user the trouble of entering more digits in the first place.

if you also need to make sure there are two digits compulsorily, Honorgod's example is the perfect one. I would not recommend leakims method for the reason it will annoy the user by showing alert every time anything is entered, at least I get annoyed.
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LVL 9

Author Comment

by:Seven price
ID: 33734275
Understandable >> Kadaba

But I want it to ask me to allow the 3rd digit before actually implementing or showing it in the text box is that possible with Honorgod's method not to sure. And if not allow have a disallow kind of ok and cancel i can do that part.

 but the method to actually stop the user from adding 3 digits before displaying it.

So for example a user types 2 digit no problem then he hits the button again but before the digit goes a pop up ask yes or no what ever and if the user hit yes then the digit adds in. making it 3 digits.
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LVL 9

Author Closing Comment

by:Seven price
ID: 33734326
tks
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LVL 41

Expert Comment

by:HonorGod
ID: 33734332
Thank you for the grade & points.

Good luck & have a great day.
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