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devel / comp.lang.javascript / Re: Bookmarklet code works console, but not from bookmark. Is it caused by iframes?

Bookmarklet code works console, but not from bookmark. Is it caused by iframes?

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From: invalid@invalid.invalid (Alfred)
Subject: Bookmarklet code works console, but not from bookmark. Is it caused by iframes?
Newsgroups: comp.lang.javascript
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by: Alfred - Sun, 2 Jul 2023 23:43 UTC

I am filling a form automatically with a bookmarklet, with lines of code like

document.getElementById('id_but1').value = " a"

The code works in the browser console, but not as a bookmarklet.

From reading this SO answer I suspect the problem is caused by iframes.

https://stackoverflow.com/questions/51723626/bookmarklets-doesnt-work-when-run-from-bookmark-but-works-from-console

SO suggests a piece of code like

let Iframe = document.getElementById('iframe_id').contentWindow.document
let value = Iframe.getElementById("textboxID").value = "Some Text"

The problem in my case is that I don't know the id for the iframe,
i.e., I don't know 'iframe_id'.

Any suggestion for knowing the ids of the iframes?

Re: Bookmarklet code works console, but not from bookmark. Is it caused by iframes?

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From: jj4public@outlook.com (JJ)
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Subject: Re: Bookmarklet code works console, but not from bookmark. Is it caused by iframes?
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by: JJ - Mon, 3 Jul 2023 10:48 UTC

On Sun, 02 Jul 2023 23:43:14 +0000, Alfred wrote:
> I am filling a form automatically with a bookmarklet, with lines of code like
>
> document.getElementById('id_but1').value = " a"
>
> The code works in the browser console, but not as a bookmarklet.
>
> From reading this SO answer I suspect the problem is caused by iframes.
>
> https://stackoverflow.com/questions/51723626/bookmarklets-doesnt-work-when-run-from-bookmark-but-works-from-console
>
> SO suggests a piece of code like
>
> let Iframe = document.getElementById('iframe_id').contentWindow.document
> let value = Iframe.getElementById("textboxID").value = "Some Text"
>
> The problem in my case is that I don't know the id for the iframe,
> i.e., I don't know 'iframe_id'.
>
> Any suggestion for knowing the ids of the iframes?

If the IFRAME content is served in a different origin than the IFRAME host,
it's not possible since bookmarklets are run in the main page context (the
IFRAME host) due to XSS.

A workaround is to use UserScript to run code in the IFRAME content's
context, where the bookmarklet code sends a message event into the IFRAME
content to notify the UserScript message event listener to run a code.

Subject	Author
Bookmarklet code works console, but not from bookmark. Is it caused by iframes?	Alfred
Re: Bookmarklet code works console, but not from bookmark. Is it caused by ifram	JJ