Limiting number of form characters with Javascript validation

Question

How can I limit the number of characters that an input form allows? I'm using a validation like this

//Last name
var x=document.forms["regForm"]["lname"].value
if (x==null || x=="")
  {
  alert("Last name must be filled out");
  return false;
  }

Neil · Accepted Answer · 2011-04-14 19:03:54Z

2

Why not set the maxlength attribute (maxLength property) on the <input> element?

answered Apr 14, 2011 at 19:03

Neil

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Naftali · Accepted Answer · 2011-04-14 18:41:40Z

0

you can do something like this:

<script>

function testInput(obj, max_length){
    if(obj.value.length > max_length){
        alert(obj.name + "'s length is too long");
    }
}

</script>

<input name='lName' onchange='testInput(this, 8);'/>
<input name='fName' onchange='testInput(this, 15);'/>

fiddle: http://jsfiddle.net/maniator/FQTM5/

answered Apr 14, 2011 at 18:41

Naftali

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2 Comments

Mike Over a year ago

Is there anyway it can look similar to the code I've entered?

Naftali Over a year ago

@Mike where do you put your code, is it in any onchange (or any action) call?

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