Getting Error “Form submission canceled because th

Question

I have an old website with JQuery 1.7 which works correctly till two days ago. Suddenly some of my buttons do not work anymore and, after clicking on them, I get this warning in the console:

Form submission canceled because the form is not connected

The code behind the click is something like this:

 this.handleExcelExporter = function(href, cols) {
   var form = $('<form method="post"><input type="submit" /><input type="hidden" name="layout" /></form>').attr('action', href);
   $('input[name="layout"]', form).val(JSON.stringify(cols));
   $('input[type="submit"]', form).click();
 }

It seems that Chrome 56 doesn't support this kind of code anymore. Isn't it? If yes my question is:

1. Why did this happened suddenly? Without any deprecation warning?
2. What is the workaround for this code?
3. Is there a way to force chrome (or other browsers) to work like before without changing any code?

P.S. It doesn't work in the latest firefox version either (without any message). Also it does not work in IE 11.0 & Edge! (both without any message)

Answer 1

Depending on the answer from KyungHun Jeon, but the appendChild expect a dom node, so add a index to jquery object to return the node: document.body.appendChild(form[0])

Answer 2

I saw this message using angular, so i just took method="post" and action="" out, and the warning was gone.

Answer 3

I see you are using jQuery for the form initialization.

When I try @KyungHun Jeon's answer, it doesn't work for me that use jQuery too.

So, I tried appending the form to the body by using the jQuery way:

$(document.body).append(form);

And it worked!

Answer 4

You can also solve it, by applying a single patch in the jquery-x.x.x.js just add after " try { rp; } catch (m) {}" line 1833 this code:

if (r instanceof HTMLFormElement &&! r.parentNode) { r.style.display = "none"; document.body.append (r); r [p] (); }

This validates when a form is not part of the body and adds it.

Answer 5

Quick answer : append the form to the body.

document.body.appendChild(form);

Or, if you're using jQuery as above: $(document.body).append(form);

Details : According to the HTML standards, if the form is not associated to the browsing context(document), the form submission will be aborted.

HTML SPEC see 4.10.21.3.2

In Chrome 56, this spec was applied.

Chrome code diff see @@ -347,9 +347,16 @@

P.S about your question #1. In my opinion, unlike ajax, form submission causes instant page move.
So, showing 'deprecated warning message' is almost impossible.
I also think it's unacceptable that this serious change is not included in the feature change list. Chrome 56 features - www.chromestatus.com/features#milestone%3D56

Answer 6

alternatively include event.preventDefault(); in your handleSubmit(event) {

see https://facebook.github.io/react/docs/forms.html