HTML: Checkbox default value

Question

When I submit a HTML form with a checked checkbox that doesn\'t have an explicitly defined value, Chrome sends on as a value for that field.

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Answer 1

Browsers will send the value of a checkbox (in the POST data) only if it is checked. A check to see if a value (any value) for a particular checkbox is present in the POST data is all you need.

i.e.

// no need to check against 'on', 'true', '1' etc..
if(post data contains a value for checkbox1) {
    // checkbox 1 is checked
}
else {
    // not checked
}