Posting an UNCHECKED check box.

[Lazer]

Hi everyone!
It looks like many programmers need to send UNCHECKED checkboxes.
I found an "elegant" way to do just that!

1. check for checked value true or false:

<input type="checkbox" id="q11" value="" name="too_busy" onClick="yesno(this.id);">

2. if false, set the INPUT VALUE to "no" or whatever...
3. FORCE the check box to BE CHECKED
here is the JavaScript:

function yesno(q) {
qc = document.getElementById(q).checked
qn = document.getElementById(q).name
if(!qc) {document.getElementById(q).checked = 'true'; document.getElementById(q).value = "NO"} else {document.getElementById(q).value = "Yes" }
}

4. SUBMIT it by javascript: document.form.submit();

In PHP $_POST
will have a YES for a checked box
and a NO for an UNCHECKED box.

I hope it helps anyone.
GoodLuck!

[ryanlund]

I dont get why the PHP programmer would need to have an unchecked checkbox posted to them.

Why not just put something like

if(isset($_POST['checkbox'])&&$_POST['checkbox']!="yes"){
        //other code here
}

[Mindzai]

Using javascript is quite ugly, just add a hidden field with the same name and a value of 0, that way it works for everyone.

[ryanlund]

I dont get why the PHP programmer would need to have an unchecked checkbox posted to them.

Why not just put something like

if(isset($_POST['checkbox'])&&$_POST['checkbox']!="yes"){
        //other code here
}

LOL what was i thinking when i wrote that =s

update:

if(!isset($_POST['checkbox'])||$_POST['checkbox']!="yes"){
        //other code here
}

[Lazer]

Hi.
Why do I need to post unchecked box? simple.

I have to create a .csv file to be opened by Excel.
so every post MUST be the same number of parameter (columns)
or the columns will "move" every line....

[Mindzai]

Well, you still don't need an unchecked checkbox, you can just check if the value isset(). However that said it can certainly make it simpler to have one, especially where you are dealing with checkbox arrays:

<input type="hidden" name="checkbox[1]" value="0" />
<input type="checkbox" name="checkbox[1]" value="1" />

[SyCo]

You can assume, when the form is submitted, a missing checkbox key from the POST array is an unchecked box. If you rely on jS to provide a value you're more likely to have a screwed up CSV then using PHP.

Good that you're trying to solve problems by thinking laterally though