php - Checkboxes with FormData.Append -

i using javascript formdata.append pass values php file, cannot check boxes working. example

html

<input type="checkbox" name="xxx" value="xxx" /><label>xxx option</label> 

js

formdata.append( 'xxx', $('input[name=xxx]').val()); 

php

if (isset($_post['xxx'])) {    echo "checked!";} 

whether check box or not, response - checked!

or php

$xxx= $_post['xxx']; 

the var $xxx shows value xxx whether checked or not.

how can pass checkboxes using method can differentiate if checkbox ticked or not!

try using

document.getelementsbyname('xxx')[0].checked

to check status of whether it's checked or not.