jquery code is not working properly

Question

I have a order form and before submitting order, user will have to go through captcha code for cash on delivery...

I am checking whether captcha code is right or wrong using jQuery.

If captcha code entered was wrong i won't let user submit form using preventDefault and will alert about error. But after entered captcha code right, It still doesn't let user submit the order.

Here is my code...

//for captcha code
      var captcha = null;
      //check if captcha code is right
      $("#apply_captcha").on("click", function(){
        var captchaUrl = '<?php echo base_url(); ?>index.php/checkout/check_captcha/';
        var captcha = $('#userCaptcha').val(); //user entered value for captcha
          $.ajax({
                url: captchaUrl,
                type: 'POST',
                data: 'captcha='+captcha,
                success: function(result)
                {
                    if(result === "success")
                    {
                        captcha = true;
                        $('#captcha_msg').hide();
                        $('#userCaptcha').css('border', '2px solid green');
                    }
                    else
                    {
                        captcha = false;
                        $('#captcha_msg').text("Sorry, Your captcha is wrong.");
                        $('#captcha_msg').css('color', '#cb2700');
                    }
                }
            });
      });

      $('#orderform').submit(function(e)
      {
          if(!pincode_available)
          {
              alert("Sorry, We are not supplying any product at this area right now.");
              e.preventDefault();
          }
          else if(!captcha)
          {
              alert("Sorry, Your captcha is wrong");
              e.preventDefault();
          }
      });

Answer 1

Remove the var keyword for the 'captcha' variable in the 'click' function. Looks like its creating a new local variable while the submit function is using the global variable.

P.S: Please see the comments on the question to see how we arrived at the solution.