AJAX调用后在jQuery中更新变量

Question

My AJAX function is below working successfully until someone resubmits the AJAX call without a page refresh . In this case, the AJAX call uses the old value of var amount rather than an updated one. Therefore, I need to update var amount at the end of my success function but am failing to do so.

$(document).on('click', '#updateBidButton', function (e) {
  e.preventDefault();

  var amount = ('#curr_bid').val()
  var expire_date = "<?php echo $this->item['expire_date']?>";

  $.ajax({
    type: 'post',
    url: "?module=items&controller=index&action=submit",
    dataType: "text",
    data: 'amount=' + amount + '&expire_date=' + expire_date,
    beforeSend: function () {
      $('.auction_box').animate({
        'backgroundColor': '#ffdead'
      }, 400);
    },
    success: function (result) {
      if (result == 'ok') {
        $('.auction_box').animate({
          'backgroundColor': '#A3D1A3'
        }, 500);
        amount = $('#curr_bid').val();
        setTimeout(function () {
          $('.auction_box').css('background-color', '#FFF');
        } , 5000);
      }
    }       
  });
});

Answer 1

in your code amount variable not updated, use

   var newValue = ''; // for example get new value from ajax response 
   $('#curr_bid').val(newValue)

for updating

Answer 2

Here you go with a solution

$(document).on('click', '#updateBidButton', function (e) {
  e.preventDefault();

  var amount = $('#curr_bid').val()
  var expire_date = "<?php echo $this->item['expire_date']?>";

  $.ajax({
    type: 'post',
    url: "?module=items&controller=index&action=submit",
    dataType: "text",
    data: 'amount=' + amount + '&expire_date=' + expire_date,
    beforeSend: function () {
      $('.auction_box').animate({
        'backgroundColor': '#ffdead'
      }, 400);
    },
    success: function (result) {
      if (result == 'ok') {
        $('.auction_box').animate({
          'backgroundColor': '#A3D1A3'
        }, 500);
        setTimeout(function () {
          $('.auction_box').css('background-color', '#FFF');
        } , 5000);
      }
    }       
  });
});

Missing $ in 3rd line. No need to reassign the value to amount variable in success method.

As you click amount variable will get the latest value from input#curr_bid .

Hope this will help you.