jQuery - 在ajax调用之后恢复表单提交

Question

Is it possible to stop a form from submitting and then resubmitting the same form from within the success of an ajax call?

At the moment it gets to the success bit but it doesn't resubmit the form which should submit and redirect the user to the http://example.com website.

Thank you very much for any help in advance

If it's not possible to do it this way, is there another way of getting it to work?

$(document).ready(function() {
    $('form').submit(function(e) {
        e.preventDefault();

        $.ajax({
            url: $('form').attr('action'),
            type: 'post',
            data: $('form').serialize(),
            success: function(data) {
                if (data == 'true')
                {
                    $('form').attr('action', 'http://example.com');
                    $('form').unbind('submit').submit(); // mistake: changed $(this) to $('form') - Problem still persists though it does not resubmit and redirect to http://example.com
                }
                else
                {
                    alert('Your username/password are incorrect');
                }
            },
            error: function() {
                alert('There has been an error, please alert us immediately');
            }
        });
    });
});

Edit:

Stackoverflow posts checked out for the code below:

• Resume form submission after $.ajax call
• How to reenable event.preventDefault?

I just thought I'd mention I have also tried this code without avail.

var ajaxSent = false;
$(document).ready(function() {
    $('form').submit(function(e) {

        if ( !ajaxSent)
            e.preventDefault();

        $.ajax({
            url: $('form').attr('action'),
            type: 'post',
            data: $('form').serialize(),
            success: function(data) {
                if (data == 'true')
                {
                    alert('submit form');
                    ajaxSent = true;
                    $('form').attr('action', 'http://example.com');
                    $('form').submit();
                    return true;
                }
                else
                {
                    alert('Your username/password are incorrect');
                    return false;
                }
            },
            error: function() {
                alert('There has been an error, please alert us immediately');
                return false;
            }
        });
    });
});

I have also tried this code without any luck as well.

$(document).ready(function() {
    $('form').submit(function(e) {
        e.preventDefault();

        $.ajax({
            url: $('form').attr('action'),
            type: 'post',
            data: $('form').serialize(),
            success: function(data) {
                if (data == 'true')
                {
                    $('form').attr('action', 'http://example.com');
                    $('form').unbind('submit').submit();
                    return true;
                }
                else
                {
                    alert('Your username/password are incorrect');
                    return false;
                }
            },
            error: function() {
                alert('There has been an error, please alert us immediately');
                return false;
            }
        });
    });
});

Answer 1

Solution was quite simple and involved adding and setting async to false in .ajax(). In addition, I have re-worked the code to work of the submit button instead which submits the form when the AJAX passes successfully.

Here is my working code:

$(document).ready(function() {
    var testing = false;
    $('#btn-login').on('click', function() {
        $.ajax({
            url: $('form').attr('action'),
            type: 'post',
            data: $('form').serialize(),
            async: false,
            success: function(data) {
                if (data == 'true')
                {
                    testing = true;
                    $('form').attr('action', 'https://example.com');
                    $('form').submit();
                }
                else
                {
                    alert('Your username/password are incorrect');
                }
            },
            error: function() {
                alert('There has been an error, please alert us immediately');
            }
        });

        return testing;
    });
});

Answer 2

It's no good practice to reselect all form tags throughout your code, what if you have multiple forms on the page? Also you'd better use .on() and .off() with jQuery.

$(document).ready(function() {
    $('form').on('submit', function(e) {
        e.preventDefault();

        // cache the current form so you make sure to only have data from this one
        var form = this,
            $form = $(form);

        $.ajax({
            url: form.action,
            type: form.method,
            data: $form.serialize(),
            success: function(data) {
                if (data == 'true')
                {
                    $form.attr('action', 'http://example.com').off('submit').submit();
                }
                else
                {
                    alert('Your username/password are incorrect');
                }
            },
            error: function() {
                alert('There has been an error, please alert us immediately');
            }
        });
    });
});

Answer 3

In one line you use $('form') to select the form to change its action, but then you use $(this) to try to select that same form. I would guess that this inside the callback function isn't what you expect it to be, and is something other than your form (possibly the window object).

Just chain the calls:

$('form').attr('action', 'http://example.com').unbind('submit').submit();