javascript - How can I get the ID from checkbox of <div> framework -


i doing seat reservation project , using framework checkbox doing this. trying save row , column of each seat session error notice: undefined index: occur.

here code of checkbox using: seat reservation code.

i did try code name of each seat.

html:

<form method="get">     <div id="1_2" role="checkbox" value="80" aria-checked="false" focusable="true" tabindex="-1" class=" seatnumber" name="a2html" method="get">2</div> </form>

php:

<?php     if(isset($_get["btncheckout"]))     {         $a2php = $_get['id'];         $_session["a2"] = $a2php;         print_r($_session["a2"]);     } ?>


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