False value being passed in ajax call

I have an Ajax call that loops through a json file with the following code:

<input class='num' type='text' name='quantity_" + element.id + "' id='numb' value='0'>

It calls a function in the form tag as follows:

<form method='POST' action='cart.php' id='cartForm' onsubmit='return myFunction();'>

When I try to validate the quantity to make sure that it's a positive number less than ten, I use the following javascript:

function myFunction() {
var x;
x =...

False value being passed in ajax call

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