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I think according to W3 spec, you're supposed to do
<input type="checkbox" checked="checked" /> And
selected="selected" But, most browsers will accept it you just write "CHECKED" and don't give it a value. So, what if you do include the attribute, are there any values that would be (consistently) considered false?
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If a checkbox is unchecked, it doesn't get sent, so setting it's value to 0 if it isn't checked isn't going to help - it will always return NULL.
val( checkbox[0]. checked ? "true" : "false" ); This will set the value of the checkbox to "true" or "false" ( value property is a string) , depending whether it's unchecked or checked .
If a checkbox is marked or checked, it indicates to true; this means that the user has selected the value. If a checkbox is unmarked or not checked, it indicated to false; this means that the user has not selected the value.
Checking if a checkbox is checked First, select the checkbox using a DOM method such as getElementById() or querySelector() . Then, access the checked property of the checkbox element. If its checked property is true , then the checkbox is checked; otherwise, it is not.
There are no values that will cause the checkbox to be unchecked. If the checked attribute exists, the checkbox will be checked regardless of what value you set it to.
<input type="checkbox" checked /> <input type="checkbox" checked="" /> <input type="checkbox" checked="checked" /> <input type="checkbox" checked="unchecked" /> <input type="checkbox" checked="true" /> <input type="checkbox" checked="false" /> <input type="checkbox" checked="on" /> <input type="checkbox" checked="off" /> <input type="checkbox" checked="1" /> <input type="checkbox" checked="0" /> <input type="checkbox" checked="yes" /> <input type="checkbox" checked="no" /> <input type="checkbox" checked="y" /> <input type="checkbox" checked="n" />Renders everything checked in all modern browsers (FF3.6, Chrome 10, IE8).
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