Power Apps is a great tool from Microsoft that helps you create custom apps without needing to know a lot about programming. One important thing you need to understand when developing apps is how to use variables. Variables help you store and manage data in your app. There are two main types of variables in Power Apps local variables and global variables. Let’s learn what they are and how to use them.
What are Variables?
Variables are like containers that hold data. This data can be anything from numbers and text to user input. In Power Apps, variables store data temporarily while the app is running.
Local Variables
Local variables are used to store data that you need only on one screen. They can’t be accessed from other screens.
How to create a Local Variable?
To create a local variable, use the UpdateContext function. Here’s an example.
UpdateContext({ localVariable: "Hello, Power Apps!" })
In this example, a local variable is the name of the local variable, and it stores the text "Hello, Power Apps!".
How to use a Local Variable?
After you create a local variable, you can use it on the same screen. For example, to display the value of the local variable in a label, you write.
Text = localVariable;
- Global Variables: Global variables are used to store data that you need on multiple screens. You can access them from any screen in your app.
How to create a Global Variable?
To create a global variable, use the Set function. Here’s an example.
Set(globalVariable, "Hello, Power Apps!");
In this example, a global variable is the name of the global variable, and it stores the text "Hello, Power Apps!".
How to use a Global Variable?
After you create a global variable, you can use it on any screen. For example, to display the value of the global variable in a label, you write.
Text = globalVariable;
When to use Local vs. Global Variables?
- Local Variables: Use them when you need data only on one screen. For example, storing user input temporarily before it is processed.
- Global Variables: Use them when you need data across multiple screens. For example, storing user login information that you need on different screens.
Difference between Local And Global Variables In Power Apps
| Feature |
Local Variables |
Global Variables |
| Scope |
Limited to the screen where created |
Accessible from any screen |
| Declaration |
UpdateContext function |
Set function |
| Syntax |
UpdateContext({LocalVariableName: Value}) |
Set(GlobalVariableName, Value) |
| Use Case |
Temporary values, screen-specific states |
Data shared across multiple screens |
| Example |
UpdateContext( { Name: "Radha", Score: 8} ); |
Set(current username, "John Doe") |
| Lifecycle |
Exists only while on the screen |
Exists throughout the app session |
| Access Control |
Limited to the screen; enhances security by limiting exposure |
Requires careful management to prevent unintended changes |