Error handler isn't called when file is uploaded via Ajax using jQuery form plug-in_问答_开发者

Error handler isn't called when file is uploaded via Ajax using jQuery form plug-in

开发者 https://www.devze.com 2022-12-29 23:37 出处：网络

Here\'s my test case. If the form is posted, a 500 error response is sent. If not, the form is sent. If the file input tag is commented out, the error handler is called. If the file input tag is pres

Here's my test case. If the form is posted, a 500 error response is sent. If not, the form is sent.

If the file input tag is commented out, the error handler is called. If the file input tag is present, the error handler isn't called. I think this might have something to do with the fact that jQuery needs to use an iframe to handle the upload and iframes don't seem to respond to the error handler.

Edit: If I add iframe: true to the options passed to ajaxSubmit to force the use of an iframe, the non-file-upload case stops working also, so it definitely has to do with the iframe.

Edit2: I'm using the jQuery Form Plugin.

<?php
    if($_SERVER['REQUEST_METHOD'] == 'POST') {
        header('HTTP/1.1 500 Internal Server Error');
        die;
    } else {?>
    <html><head>
        <script type='text/javascript'
          src='http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js?ver=2.9.2'></script>
        <script type='text/javascript'
          src='http://github.com/malsup/form/raw/master/jquery.form.js?v2.43'></script>
        <script type="text/javascript">
            jQuery(document).ready(function() {
                jQuery('a').click(function() {jQuery('form').ajaxSubmit({error: function(){alert('error handler called');}})});
            });
        </script>
    </head><body>
        <form method="POST">
            <input type="text"开发者_如何转开发 name="mytext" />
            <input type="file" name="myfile" /><!-- comment this element out -->
            <input type="hidden" name="blah" value="blah" />
            <a>submit</a>
        </form>
    </body></html>

<?php }

Is there any way to get the error handler to be called in both situations?

As far as I can tell from looking at the .ajaxSubmit code, no attempt is made to detect or handle errors in the case that you've submitted to an <iframe>. I suspect that's because there's just no way for it to learn about the error code that came back from the server in the HTTP response targeted at the <iframe>. It does call the "success" and "complete" plugins, and it tries to cobble together a fake xhr object using whatever it finds in the DOM in the <iframe>.

It seems to me that you use incorrect Form Submission plugin ajaxSubmit(). If the code of ajaxSubmit correspond to the code from http://be.twixt.us/jquery/formSubmission.php, parameters like {error:..,} will be ignored by ajaxSubmit().

ajaxSubmit() use $.post to make ajax request, so you can define you error callback by jQuery.ajaxSetup() (see http://api.jquery.com/jQuery.ajaxSetup/ and http://api.jquery.com/jQuery.ajax/)

UPDATED: How I can see from the source of plugin which you used (see http://github.com/malsup/form/raw/master/jquery.form.js?v2.43) $.ajax(options); will be use only in else part of the following if statement:

if (files.length && options.iframe !== false) || options.iframe || found || multipart) {
    if (options.closeKeepAlive)
        $.get(options.closeKeepAlive, fileUpload);
    else
        fileUpload();
} else
     $.ajax(options);

so in all other cases you can not use error as a parameter of ajaxSubmit(). So you can set {closeKeepAlive: true} as a parameter of ajaxSubmit() and don't forget to set beforeerrorcallback byjQuery.ajaxSetup()` as I described before.

LTTP, but to get this to work without using a forked jquery.form plugin, set the dataType option to 'json':

form.ajaxSubmit({ datatype: 'json', ...

then make the server return a trivial response on success (which gets interpreted as valid JSON), instead of the bare 200 OK response. Can be as simple as: