Checkbox is not displaying as checked, even though it is

Question

I have PHP script that sets checked="checked" to checkboxes based on the database record. However all, but the first occurence of the checked checkbox are displaying checked. Here is what HTML looks like when it browser parses it:

<input type="checkbox" id="not_online"><label for="not_online">Not Online</label>
<input type="checkbox" id="facebook" checked="checked"><label for="facebook">Facebook</label>
<input type="checkbox" id="twitter" checked="checked"><label for="twitter">Twitter</label>

And this is what I see in FF26.0

[ ] Not Online
[ ] Facebook
[×] Twitter

What could cause the issue?

Answer 1

Add name to each of your checkbox fields:

<input type="checkbox" id="not_online" name="not_online"><label for="not_online">Not Online</label>
<input type="checkbox" id="facebook" name="facebook" checked="checked"><label for="facebook">Facebook</label>
<input type="checkbox" id="twitter" name="twitter" checked="checked"><label for="twitter">Twitter</label>

Answer 2

Its is working fine for me what problem are you having? Here is my fiddle http://jsfiddle.net/dbDj3/

using your code

    <input type="checkbox" id="not_online"><label for="not_online">Not Online</label>
    <input type="checkbox" id="facebook" checked="checked"><label for="facebook">Facebook</label>
    <input type="checkbox" id="twitter" checked="checked"><label for="twitter">Twitter</label>

It must be some other part of your code that is causing problems