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How can I programmatically determine if a screen is currently using Modern or Classic UI?

  • July 24, 2025
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darylbowman
Captain II
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The title says it all.

I want to show a button only if Modern UI is being used.

Best answer by Dmitrii Naumov

​@darylbowman I think you are overthinking it. Could you just set Visible=false in aspx for that action?

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Daryl 🧩 I build Acumatica add-ons 🔗deftstrokesdev.com/products?ref=forum

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JSpikowski
Jr Varsity II
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I'm assuming the modern UI is JavaScript driven and the old UI is .net webforms.

What version of Acumatica is the modern UI implemented in?

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    Jr Varsity III
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    Hello ​@darylbowman I think this post gives some idea about your task.
    https://www.acumatica.com/blog/developer-preview-of-acumaticas-new-modern-ui/

    I hope it helps.

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    Abhishek Nikam || MVP 2026 || https://www.linkedin.com/in/abhisheknikam3
      darylbowman
      Captain II
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       ...I think this post gives some idea about your task.

      No, not really at all.

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      Daryl 🧩 I build Acumatica add-ons 🔗deftstrokesdev.com/products?ref=forum
      darylbowman
      Captain II
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      I'm assuming the modern UI is JavaScript driven and the old UI is .net webforms.

      What version of Acumatica is the modern UI implemented in?

      The Modern UI is built on HTML and TypeScript (which gets built into JavaScript, yes).

      It is in preview in 24 R2 and 25 R1.

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      Daryl 🧩 I build Acumatica add-ons 🔗deftstrokesdev.com/products?ref=forum
      Dmitrii Naumov
      Community Manager
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      ​@darylbowman I think you are overthinking it. Could you just set Visible=false in aspx for that action?

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        Tony Lanzer
        Captain II
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        ​@darylbowman , I think you could also query the SiteMap table to determine the SelectedUI value for the screen.

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          darylbowman
          Captain II
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          ​...set Visible=false in aspx for that action

          I think this is the easiest.

          The closest I got in TypeScript was defining the action as PXActionState on the view and using a @handleEvent on RowSelected to enable it. The problem is, it didn’t work.

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          Daryl 🧩 I build Acumatica add-ons 🔗deftstrokesdev.com/products?ref=forum
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