POST a form in an iframe

I would like to POST a form in an iframe, generated like so:

My JS loads an iframe inside the page, adds a form to the iframe and submits the form. What I would like to happen is the iframe to load the result of that request. So, I would effectively like to post a form and render the result inside the iframe, without touching the parent (apart from putting the iframe up for display in the first place).

I am using the code from this answer:

JavaScript post request like a form submit

but I can't get it to not reload the parent. I post the form, and instead of the iframe refreshing, the entire parent refreshes. I d开发者_如何学Pythonon't know why that is, since the url it's posting to is different and would at least redirect there.

Can anyone help me with this problem? I just want a post inside an iframe and only within the iframe, basically.

EDIT: After some more research, apparently the form is not being created properly. I'm using document.createElement("form") and then document.getElementById("my_iframe_id").appendChild(form) to append it, but it does not seem to be working correctly.

Correct, because you are creating the form node in the current document.

document.getElementById("my_iframe_id").contentWindow.document.createElement('form'); 

to create it inside the iframe.

It works now, part of it was that "document" was wrong, as Dan said, and the other part was that, when inserting into the iframe, one needs to use document.getElementById(div).contentWindow.document.childNodes[0].appendChild(form) rather than just document.getElementById(div).innerHTML.

Not sure how much this will help, but the answer you point at does not give the form a name/id. If you are trying to post the form with something like document.getElementById('myForm').submit(), you might have a problem because your form doesn't have a name/id.

In the past, I've had trouble with form submission apparently submitting the wrong form when there are multiple forms on a page. In every case, giving the form a name/id and then getting the form by id and calling submit() seemed to solve the problem.