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jquery - set value of hidden input field based on values of text fields

Posted on 2010-11-22
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Last Modified: 2012-06-21
I have three form fields: name, first name, and lastname. The name field is hidden and I'm trying to set the value to the firstname + lastname on keypress. I'm also trying to format it so that the characters are all lowercase and spaces are transformed into dashes.

So:

<input type="text" name="firstname" value="John John" />
<input type="text" name="lastname" value="Doe" />
<input type="hidden" name="name" value="john-john-doe" />

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I've been trying to use the following code, but it's not working...

         
   $('input[name=field_firstname[0][value]]').keyup(function() {
                    var firstname = $('input[name=field_firstname[0][value]]').val();
                    var lastname = $('input[name=field_lastname[0][value]]').val();
                    $('input[name=name]').val(firstname.replace(/\s/g, "-").toLowerCase()+lastname.replace(/\s/g, "-").toLowerCase());
            });

            $('input[name=field_lastname[0][value]]').keyup(function() {
                    var firstname = $('input[name=field_firstname[0][value]]').val();
                    var lastname = $('input[name=field_lastname[0][value]]').val();
                    $('input[name=name]').val(firstname.replace(/\s/g, "-").toLowerCase()+lastname.replace(/\s/g, "-").toLowerCase());
            });

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Question by:n00b0101
  • 2
3 Comments
 
LVL 16

Accepted Solution

by:
jmatix earned 500 total points
ID: 34190437
This should work:
$(document).ready(function(){
$('input[name=firstname]').keyup(function() {
                var firstname = $('input[name=firstname]').val();
                var lastname = $('input[name=lastname]').val();
                $('input[name=name]').val(firstname.replace(/\s/g, "-").toLowerCase()+lastname.replace(/\s/g, "-").toLowerCase());
        });

        $('input[name=lastname').keyup(function() {
                var firstname = $('input[name=firstname').val();
                var lastname = $('input[name=lastname').val();
                $('input[name=name]').val(firstname.replace(/\s/g, "-").toLowerCase()+lastname.replace(/\s/g, "-").toLowerCase());
        });
});

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0
 
LVL 16

Expert Comment

by:jmatix
ID: 34190470
Sorry, slight correction:
$(document).ready(function(){
$('input[name=firstname]').keyup(function() {
                var firstname = $('input[name=firstname]').val();
                var lastname = $('input[name=lastname]').val();
                $('input[name=name]').val(firstname.replace(/\s/g, "-").toLowerCase()+lastname.replace(/\s/g, "-").toLowerCase());
        });

        $('input[name=lastname]').keyup(function() {
                var firstname = $('input[name=firstname]').val();
                var lastname = $('input[name=lastname]').val();
                $('input[name=name]').val(firstname.replace(/\s/g, "-").toLowerCase()+lastname.replace(/\s/g, "-").toLowerCase());
        });
});

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0
 
LVL 17

Expert Comment

by:jrm213jrm213
ID: 34190477
Hi,
It might be better to use .blur() instead of .keyup, then you are running your code a lot less, and blur will get called whenever that field loses the focus...

plus unless for some reason you can't do it, it would be good to give your input boxes an id and use that to find them. I believe id is technically a required attribute anyway.
<script type="text/javascript">
	$(document).ready(function() {
		$('#firstname,#lastname').blur(function() {
			frst = $('#firstname').val().toLowerCase().replace(/ /g,'-');
			lst = $('#lastname').val().toLowerCase().replace(/ /g,'-');
			$('#name').val(frst + "-" + lst);
			alert($('#name').val());
		});
	});
</script>

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