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Web Page custom selector not working

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Posted on by nabeelahmad1

I've built a custom selector
tr[class*="panel-list-row"]:contains(%CourseNameShort%):contains(%Trimester%)

This is working perfectly in some flows. I created a new flow and enabled Power-Fx preview. The same selector is not working in the newly created flows.

Any suggestions? What could be the possible reason?

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Power Automate Desktop

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eetuRobo 4,539 Super User 2026 Season 1 on at

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That's because you enabled Power Fx and the syntax is different. Power Fx variable syntax you use equals sign. So add = just before the variable name.
Like so:
div[Text="%=NewVar%"]

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nabeelahmad1 9 on at

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I tried this, still the same issue.

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cwischnewski 162 on at

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I thought I read that you can't use variables in CSS selectors when you enable Power Fx. But I also noticed that variable reference does away with the percent signs entirely. So %MyVariable% would be =MyVariable now. When I have done custom CSS Selectors, I have assigned the string of the selector to a variable and then in the UI Element I change it to just %MyVariable% with MyVariable being the string of the selector. If that is what you are doing, the problem is that you can't change your UI Element to use a variable.

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eetuRobo 4,539 Super User 2026 Season 1 on at

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For me this works:
@cwischnewski
I think it doesn't work if you only use the =MyVariable but you need to include the %-signs even though many times in Power Fx you don't use them.
It might also be because I use the Text editor mode or because operator is not equal but contains.

~~I think the problem might be contains() syntax.~~
Edit: I actually tried the contains and seems to work.
Also I noticed that it finds the element when I use Test but not in the actual flow. So as @cwischnewski said I think using variables in Power Fx is not supported yet.

Remember to use Text editor toggle on since otherwise the variables might not work with the UI elements.

If you cant figure it out I recommend reconsidering usage of Power Fx and just making new flow without Power Fx(it will most likely give you more problems in the future too since its in preview and might be for a long time)

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