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Question

Javascript and only one Checkbox - undefined

Answer 1

A:

jQuery is your friend:

$("input[type='checkbox']").attr('checked', false);

(... if jQuery is available to you?)

teedyay 2009-02-10 23:12:22

checks is the name of the <form>, user is the name of the checkbox.

jishi 2009-02-10 23:16:11

Ah, beg your pardon - right you are!

teedyay 2009-02-10 23:19:02

Ugh, recommending a massive framework for the simplest of tasks.

chaos 2009-02-10 23:19:55

Heh - yeah, I take your point. I guess I'm just a bit wowed by jQuery of late: it's solved *so* many of my browser-specific headaches! :-)

teedyay 2009-02-10 23:22:11

Answer 2

A:

I'd probably iterate across document.checks.elements, looking for .type == 'checkbox'.

chaos 2009-02-10 23:19:00

Answer 3

+2 A:

Use a loop control variable, and set it to 1 if length is undefined...

var len = document.checks.user.length;
if(len == undefined) len = 1;
for (i = 0; i < len; i++) //for all check boxes

Best regards...

Josh Stodola 2009-02-10 23:25:38

This is what I am looking for. However, I realized when there is only one element left, the if statement I have will not work when there is only 1 element. i.e -> if (document.checks.user[0].checked == true )

Tommy 2009-02-10 23:56:15

I believe it no longer sees user as an array....? I'll put the document.checks.submit(); in this loop control.

Tommy 2009-02-10 23:59:47

Answer 4

+1 A:

if(document.checks.user[0]) {
  //it's an array
}
else {
  //it's a single element
}

Diodeus 2009-02-11 05:36:32

Answer 5

+1 A:

if (document.getElementById('Checkbox1').checked) { /* do something */ }

if you want to loop a bunch of checkboxes, you could loop the input fields of your form, like:

var formNodes  = document.checks.getElementsByTagName('input');
for (var i=0;i<formNodes.length;i++) {
   /* do something with the name/value/id or checked-state of formNodes[i] */
}

KooiInc 2009-02-11 07:31:27

Answer 6

A:

Your question is somewhat confusing, since your javascript would obviously have to be inside a function called 'sub_delete' to be any use... someone with the mighty power to edit questions might improve the question by making that clearer...

So the first issue you have to get around is the fact that for single checkbox, with a given name 'user', is not an array, and therefore has no defined length, but also if you try and access it as an array.. things get confused.. a full rewrite of your javascript function might look like this:

    function sub_delete{
        if (typeof document.checks.user.length === 'undefined') {
   /*then there is just one checkbox with the name 'user' no array*/
        if (document.checks.user.checked == true )
                            {
                                document.checks.submit();
                                return 0;
                            }   
    }else{
  /*then there is several checkboxs with the name 'user' making an array*/
        for(var i = 0, max = document.checks.user.length; i < max; i++){
            if (document.checks.user[i].checked == true )
                            {
                                document.checks.submit();
                                return 0;
                            }

        }
    }
    }//sub_delete end

HTH, -FT

ftrotter 2010-08-02 06:23:57

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Javascript and only one Checkbox - undefined

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