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Lakshmi Bhargavi Gajula
Lakshmi Bhargavi Gajula

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Power Apps Components Explained: Build Reusable UI Like a Pro

#powerapps #lowcode #components #microsoft

Power Apps Components Explained: Build Reusable UI Like a Pro

Imagine building a form in Power Apps, perfecting the styling, adding validation logic, and then realizing you need the exact same form in five other screens. You copy it. Then a design change comes in, and you have to update all five copies manually. Sound familiar? That's the problem Power Apps Components solve — and once you understand them, you'll wonder how you ever built apps without them.

In this post, we'll break down what components are, how they work, and how to build one from scratch. Whether you're coming from traditional software development or exploring the low-code space for the first time, this guide has you covered.

What Are Components in Power Apps?

Components in Power Apps are reusable UI building blocks — think of them like custom controls or widgets. They're similar in concept to components in React or Angular: you define them once, and you can drop them into any screen (or even share them across apps).

Key characteristics of Power Apps Components:

  • Encapsulated logic and UI — the component manages its own behavior internally.
  • Custom properties — you can define inputs and outputs to communicate with the parent app.
  • Reusable across screens — place the same component on multiple screens without duplicating logic.
  • Component Libraries — share components across multiple apps in your organization.

Components vs. Screens vs. Controls

Before diving deeper, let's clarify the hierarchy:

Concept Description
Screen A full page/view in your app
Control A built-in element (Button, TextInput, Gallery, etc.)
Component A custom, reusable group of controls with its own properties

Components sit between controls and screens. They're composed of built-in controls but behave like a single, self-contained unit.

Creating Your First Component

Let's build a simple Header Bar Component that accepts a title and a background color as inputs.

Step 1: Enable Components (if needed)

In older environments, you may need to enable the Components feature:

  1. Go to File > Settings > Advanced Settings.
  2. Toggle on Components.

In most modern Power Apps Studio, this is enabled by default.

Step 2: Create a New Component

  1. Open Power Apps Studio and open (or create) a Canvas App.
  2. In the left panel, click the Tree View icon.
  3. Click on Components tab at the top of the Tree View.
  4. Click + New Component.

You'll see a blank canvas — this is your component's design surface.

Step 3: Add Custom Input Properties

Components communicate with the outside world through custom properties.

  1. With your component selected, click New custom property in the right panel.
  2. Create a property called HeaderTitle:
    • Display name: HeaderTitle
    • Property type: Input
    • Data type: Text
    • Default value: "My App"
  3. Create another property called BackgroundColor:
    • Display name: BackgroundColor
    • Property type: Input
    • Data type: Color
    • Default value: RGBA(0, 120, 212, 1)

Step 4: Design the Component

Now add controls inside the component:

  1. Insert a Rectangle control and set its properties: 
Fill: HeaderBar.BackgroundColor
Width: Parent.Width
Height: 60
X: 0
Y: 0
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  1. Insert a Label control on top of the rectangle: 
Text: HeaderBar.HeaderTitle
Color: White
FontWeight: Bold
X: 16
Y: 0
Height: 60
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Note: Inside a component, you reference your custom input properties using the component's name followed by the property name (e.g., HeaderBar.HeaderTitle).

Using the Component in Your App

Now that the component is built, let's use it on a screen.

  1. Go back to the Screens tab in Tree View.
  2. Select a screen.
  3. Click Insert > Custom — your component will appear in the list.
  4. Insert it onto the screen.

You'll immediately see it render. Now customize it via the properties panel on the right:

HeaderTitle: "Dashboard"
BackgroundColor: RGBA(50, 50, 50, 1)
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Every instance of the component can have different values — just like passing props in React.

Output Properties: Getting Data Back Out

Components aren't just for display. You can also define Output properties to send data back to the parent screen.

Example use case: A custom date picker component that exposes the selected date.

  1. Create a custom property:

    • Display name: SelectedDate
    • Property type: Output
    • Data type: DateTime

  2. Inside the component, bind a DatePicker control's value to this output:

// In the component, set the Output property formula:
SelectedDate = DatePickerControl.SelectedDate
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  1. On your screen, you can now reference it like: 
Text: MyDatePickerComponent.SelectedDate
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This creates a clean, predictable data flow between your component and the screen.

Component Libraries: Sharing Across Apps

The real power unlocks when you use Component Libraries — a dedicated environment asset that lets multiple apps consume the same components.

How to Create a Component Library

  1. Go to make.powerapps.com.
  2. Click + Create > Component Library.
  3. Build your components inside the library.
  4. Publish the library.

How to Use a Component Library in an App

  1. In Power Apps Studio, go to Insert > Get more components.
  2. Browse to your Component Library.
  3. Import the component — it now appears under Library Components in the Insert menu.

When you update the library and publish, apps using it will receive a notification to update — similar to a package version update in npm.

Best Practices for Power Apps Components

Here are some developer-friendly tips to keep your component architecture clean:

  • Name components clearly — use PascalCase like HeaderBar, NavMenu, SearchCard.
  • Keep components focused — one component, one responsibility.
  • Avoid deeply nested components — Power Apps has a nesting limit and performance can degrade.
  • Document custom properties — use the Description field when creating properties to help teammates.
  • Use Component Libraries for organization-wide standards — maintain a design system.
  • Test components in isolation before embedding them in complex screens.

Limitations to Be Aware Of

Power Apps components are powerful but have some gotchas:

  • No behavioral properties by default (though this can be enabled in some environments) — passing functions as properties is limited compared to code-based frameworks.
  • Component nesting has limits — you can't infinitely nest components.
  • Context variables and collections defined outside a component aren't automatically accessible inside it. You need to explicitly pass them via input properties.
  • Component Library updates are not automatic — app makers must opt-in to accept updates.

Conclusion

Power Apps Components bring a developer-friendly, modular mindset to the low-code world. By encapsulating UI and logic into reusable, property-driven units, you can:

  • Eliminate duplication across screens and apps.
  • Enforce consistency in UI design.
  • Speed up development by reusing proven building blocks.
  • Simplify maintenance — fix once, update everywhere.

If you're building anything beyond a simple one-screen app, components should be part of your Power Apps toolkit. Start small — extract something you've already duplicated into a component — and you'll immediately feel the difference.

Happy building! 🚀

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