Question

Javascript Error form validation

Asked by: logicjb

Hi

I am having a very strange problem with a form validation script I'm using on the following page, it reports that value is undefined - which I thought was due to an incorrectly named element but it all appears to be ok.

http://app.kambee.com/?i=100-39

Error: value is not defined
LINE 14

The error is when the form is submitted - Another set of eyes would be greatly appreciated!

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Asked On
2007-11-15 at 15:43:29ID22964593
Tags

error

,

form

,

javascript

,

script

Topics

JavaScript

,

Extensible HTML (XHTML)

,

Perl Programming Language

Participating Experts
3
Points
500
Comments
14

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Answers

 

by: BadotzPosted on 2007-11-15 at 15:54:01ID: 20294132

Hard to see the problem from only your question...how about some code?

 

by: logicjbPosted on 2007-11-15 at 15:55:33ID: 20294145

I gave a link to the page above, is it stripped from the question?

 

by: BadotzPosted on 2007-11-15 at 15:59:36ID: 20294195

If the problem is in an ASP page, we will not be able to see that from your website :-( You will have to post it here.

 

by: logicjbPosted on 2007-11-15 at 16:01:06ID: 20294212

It's not in an ASP page, it's in the HTML source which you can view from the URL above? This is a javascript related question - not ASP.

 

by: b0lsc0ttPosted on 2007-11-15 at 16:03:33ID: 20294233

logicjb,

The problem is checking for value with the radio buttons.  The radios actually end up being a collection.  You need to loop them, see which is checked, and then get the value of the checked button.  I can help with the specifics if you need it.

Let me know if you have any questions or need more information.

b0lsc0tt

 

by: logicjbPosted on 2007-11-15 at 16:04:54ID: 20294251

Thanks b0lsc0tt, that's a great help.

How would one loop the values?  - apologies if that's a pain to explain

 

by: _Maddog_Posted on 2007-11-15 at 16:07:10ID: 20294271

Hi,

You're trying to check the "value" of two radio controls.
thisform.q70 is an array of two radio controls, it does not have a value attribute.

Look into radio controls validation, here's a sample:
http://www.codeave.com/javascript/code.asp?u_log=7049

validate_form, calls validate_required, with thisform.q70 as a parameter, it fails while checking this.q70.value, because it is an array of two radio controls.

- Maddog

 

by: b0lsc0ttPosted on 2007-11-15 at 16:08:07ID: 20294284

Let me work on some code.  It is easier to show than explain.  In the meantime to test what I mean add an alert in the first function like ...

function validate_required(field,alerttxt)
{
alert(field[0].value);

If the Yes is checked in the first question you will see the value.  Basically the loop will make that work for all of the radios.

bol

 

by: logicjbPosted on 2007-11-15 at 16:18:40ID: 20294444

Thanks bol, the problem does indeed go away if I remove validation for radio - and checkboxes too though.

 

by: b0lsc0ttPosted on 2007-11-15 at 16:27:54ID: 20294545

Try changing your first function too ...

(see snippet)

It is a little hard for me to test this but that is close.  I have some alerts and you can remove those if needed.

Let me know the results.

bol

function validate_required(field,alerttxt) {
      with (field) {
            alert(length);
            if (length > 1) {
                  for (var item in length) {
                        if (item.checked) {
                              alert(item.name + '-' + item.value);
                              while (item) {
                                    if (value==null||value=="")
                                      {alert(alerttxt);return false}
                                    else {return true}
                              }
                        }
                  }
            } else {
                  alert(name + '-' + value)
                  if (value==null||value=="")
                    {alert(alerttxt);return false}
                  else {return true}
            }
      }
}

                                              
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by: b0lsc0ttPosted on 2007-11-15 at 16:32:58ID: 20294600

One possible issue remaining.  Do you want to require a radio or check box to be checked?  The current script won't but I can add it.

bol

 

by: b0lsc0ttPosted on 2007-11-15 at 16:55:05ID: 20294699

I had to get rid of some of the with()'s you were using.  The code should now alert if a set of radios or checkboxes aren't checked.  The focus won't work on those fields though and it seems to still submit when it shouldn't but that may just be my test page.

The revised function is below.

bol

function validate_required(field,alerttxt) {
	if (field.type == 'text') {
		with (field) {
			if (value==null||value=="")
			  {alert(alerttxt);return false}
			else {return true}
		}
	} else {
		var chked = false;
		for (var i=0; i< field.length; i++) {
			if (field[i].checked) {
				chked = true;
				break;
			}
		}
		if (!chked) {alert(alerttxt);return false}
	}
}

                                              
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by: logicjbPosted on 2007-11-16 at 00:51:56ID: 31409473

Superb, thank you.

 

by: b0lsc0ttPosted on 2007-11-16 at 09:04:01ID: 20299634

I'm glad that did it.  Thanks for the fun question, the grade, and the points.  See you around. :)

bol

20120131-EE-VQP-002

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