Prevent double submission of forms in jQuery

Question

I have a form that takes a little while for the server to process. I need to ensure that the user waits and does not attempt to resubmit the form by clicking the button agai

Answer 1

If using AJAX to post a form, set async: false should prevent additional submits before the form clears:

$("#form").submit(function(){
    var one = $("#one").val();
    var two = $("#two").val();
    $.ajax({
      type: "POST",
      async: false,  // <------ Will complete submit before allowing further action
      url: "process.php",
      data: "one="+one+"&two="+two+"&add=true",
      success: function(result){
        console.log(result);
        // do something with result
      },
      error: function(){alert('Error!')}
    });
    return false;
   }
});

Answer 2

Nathan's code but for jQuery Validate plugin

If you happen to use jQuery Validate plugin, they already have submit handler implemented, and in that case there is no reason to implement more than one. The code:

jQuery.validator.setDefaults({
  submitHandler: function(form){
    // Prevent double submit
    if($(form).data('submitted')===true){
      // Previously submitted - don't submit again
      return false;
    } else {
      // Mark form as 'submitted' so that the next submit can be ignored
      $(form).data('submitted', true);
      return true;
    }
  }
});

You can easily expand it within the } else {-block to disable inputs and/or submit button.

Cheers

Answer 3

this code will display loading on the button label, and set button to

disable state, then after processing, re-enable and return back the original button text**

$(function () {

    $(".btn-Loading").each(function (idx, elm) {
        $(elm).click(function () {
            //do processing
            if ($(".input-validation-error").length > 0)
                return;
            $(this).attr("label", $(this).text()).text("loading ....");
            $(this).delay(1000).animate({ disabled: true }, 1000, function () {
                //original event call
                $.when($(elm).delay(1000).one("click")).done(function () {
                    $(this).animate({ disabled: false }, 1000, function () {
                        $(this).text($(this).attr("label"));
                    })
                });
                //processing finalized
            });
        });
    });
    // and fire it after definition
});

Answer 4

You can stop the second submit by this

$("form").submit(function() {
        // submit more than once return false
        $(this).submit(function() {
            return false;
        });
        // submit once return true
        return true; // or do what you want to do
    });
});