Changing background color for model driven app

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Posted on by Lucas001

2,563 Super User 2026 Season 1

Hi everyone,

it seems that the problem still persists.

I want to change the colour of my model driven app text input field. Using JS, it generally seems to be possible.

I achieved the following with a direct console execution of:

document.querySelector("[data-id=cdt_p_familienname] input").style.backgroundColor = "rgb(255,199,206)"

Problem is I usually would implement my <script></script> in the end to be loaded last. Seems not to be possible in MDAs.

I now tried the .OnLoad()-Event of the form itself. Unfortunately it seems that the OnLoad event fires before the DOM is loaded in some way. When outputting the HTML using window.document I just get some scripts.

Even using a setTimeout() does not work as the script seems to only get elements which are within or executed before the form OnLoad().

Anyone knows why it behaves like that?

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Building Power Apps

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Jonathan Manrique 2,695 on at

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Hi @Lucas001

In Model Driven Apps applications it is not possible to make these types of changes with Javascript because you must have to modify the html of the application and it is something that is not recommended to do and can damage the application.

Now there are options under the PCF components for what you mention, you can develop PFC or pull from the existing community gallery

https://learn.microsoft.com/en-us/power-apps/developer/component-framework/overview
https://pcf.gallery/

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Lucas001 2,563 Super User 2026 Season 1 on at

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Hi @Jmanriquerios,

thanks for the reply. I assumed it's as you say, still hoped differently.
I will try starting with a PCF than.

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DW-07111621-0 2 on at

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I tried to change a section colour via an event handler on Form Load.

const dataId = `tab_details_section_holidays` document.querySelector(`section[data-id="${dataId}"]`) as HTMLElement;

However, the code would never find the element so thinking this not supported. Can you use a custom PCF control to build your own section element?

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