Two Jquery Functions Listening To The Same Button Click But Only One Works

Code for the first function(keeping in mind its tested and it works fine): $('.create-invoice').on('click',function() { grab_invoice_data(); // Declare a variable v

Solution 1:

You could try to call the second function from the first.

$('.create-invoice').click(function(){
    secondFunction();
    //rest of code
});

var secondFunction = function(){
    //code
};

Solution 2:

As discussed in the comments, the problem is that you accidentally inserted a line which was not meant to be there:

$.download("php/json.php", postArray, 'post');

Just remove this line and it should all work.