Allowing User Check / Uncheck All Checkboxes In Form

Dec 20, 2011

I am trying to allow a user to easily uncheck/check all checkboxes in a form by checking or unchecking a checkbox. The checkboxes would be in a form like so:
<form action="" method="post">
<input type="checkbox" name="checked[]" value="1">
<input type="checkbox" name="checked[]" value="2">
<input type="checkbox" name="checked[]" value="3">
<input type="checkbox" name="checked[]" value="4">
</form>

I use an event handler to call a function:
<input type="checkbox" name="checkall" onchange="checkall('checked[]', this.checked)">

And here is the function:
function checkall(box_name, current_state) {
all = document.getElementsByName(box_name);
action = (current_state == "checked") ? "false" : "true";
for (i = 0; i < all.length; i++) {
all[i].checked=action;
}}

The event handler should pass the name of the checkboxes and whether the "check all" checkbox is currently checked or not to the checkall() function. Nothing happens when I check/uncheck the "check all" function.

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< script
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Oct 7, 2009

I have a pretty simple survey form, with 5 checkbox answers, one of them being "None of the Above". All 5 are part of the same question1[] array. My goal is to have a function that unchecks the other 4 boxes when None of the Above is checked. The problem is that since None of the Above is part of the question1 array, it unchecks itself. So how do I separate this None of the Above option? After all, it is still a valid answer to question 1, so I don't want it to sit in a different array just because...

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I'd like the ability to have a checkbox that will check all elements with a certain name when selected, and to have another checkbox that will do the same with another set of elements.

I had found the following code, and it worked:

function toggleChecked(oElement)
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<input type="checkbox" name="addsuggestedjokes[]" onclick="toggleChecked(this)" />
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And the following for my other checkboxes:

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However, this presented a problem because I do not want my check/uncheck checkboxes to be part of my addsuggestedjoke[] or removesuggestedjoke[] arrays!

I tried to change everything as follows, but it doesn't work:


Changed toggleChecked:

function toggleChecked(oElement, elementName)
{
oForm = oElement.form;
oElement = oForm.elements[elementName];
if(oElement.length)
{
bChecked = oElement[0].checked;
for(i = 1; i < oElement.length; i++)
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Changed check/uncheck HTML:

<input type="checkbox" name="addallsuggestedjokes" onclick="toggleChecked(this, 'addsuggestedjoke[]')" />
<input type="checkbox" name="removeallsuggestedjokes" onclick="toggleChecked(this, 'removesuggestedjoke[]')" />

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$('#myCheck').attr('checked', true); // to check
$('#myCheck').attr('checked', false); // to uncheck
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Here is the current javascript...

Code:

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Is there a way to do a check/uncheck all on a list of checkboxes that have different names/IDs? Like this:

HTML Code:
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<input type="checkbox" name="checkbox2" id="checkbox2" value="First"> First Checkbox
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Below is the JS code I've used in the past (when my checkbox names/IDs are the same throughout)
Code:
function checkAll(checkname, exby){
for (i = 0; i<checkname.length; i++)
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The HTML output looks like this:

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Patient #2<input id="patient_2" name="patient[2]" type="checkbox"
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Patient #4<input id="patient_4" name="patient[4]" type="checkbox"
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