Javascript Frame Target

Question

Hello I have minimal experience in JavaScript and decided to make a bookmark that fills in a form on a website and submit().

I am using the console on the Internet Explorer Developer Tools to test my code. On the website I want to run my commands there is a complication.

I can run commands on the website via Developer Tools, only after I change the Target: "_top: New" to Target: "Frame: UIService.aspx" in my Developer Tools Console.

My JavaScript codes saved as bookmarks don't work because they are targeting the wrong frame. How do I change the frame from Target: "_top: New" to Target: "Frame: UIService.aspx" in code? They have two different URLs.

Answer 1

document.querySelector('Your_ID_Iframe').contentWindow.document

This is right?

ref: https://www.w3schools.com/howto/tryit.asp?filename=tryhow_js_element_iframe

Answer 2

I tried with no success, these are the outputs:

document.querySelector(' iframe class name ').contentWindow.document
Unable to get property 'contentWindow' of undefined or null reference

However this returns true:

serv = document.getElementsByClassName(' iframe class name ')
serv.length: 1

I need to alter a table inside of this iframe, so I would do:
serv.getElementById(' id of table '); ??
This is not correct?