MAT_DIALOG_DATA: Error – inject() must be called from an injection context

Have you ever encountered the “inject() must be called from an injection context” error while working with MatDialog in Angular? It can be quite perplexing, especially when you’re just starting out with your Hello World project. But fear not, in this blog post, we’ll dive into this issue and explore possible solutions to get your MatDialog working smoothly.

Understanding the Error

The error message “inject() must be called from an injection context” usually occurs when there is a problem with how you’re using the MatDialog module. It indicates that the inject() function is not being called from the correct context, resulting in this error.

Possible Causes

1. Missing Imports: Make sure you have imported the necessary modules and dependencies related to MatDialog. Check if you have imported MatDialogModule, MatDialogRef, and MAT_DIALOG_DATA from the ‘@angular/material/dialog’ package.
2. Incorrect Usage of MatDialog: Ensure that you are using the MatDialog module correctly within your component. Pay attention to the correct syntax and usage of the MatDialog functions and constructors.
3. Module Declaration: Check if you have declared the component that uses the MatDialog module in the correct module file. The component and the MatDialog module should be declared in the same module.

Solutions

1. Import MatDialogModule: Make sure you have imported the MatDialogModule in your module file. Include it in the ‘imports’ array of the @NgModule decorator.
2. Check Dependencies: Verify that you have imported MatDialogRef and MAT_DIALOG_DATA from the ‘@angular/material/dialog’ package. These dependencies are crucial for proper functioning of the MatDialog module.
3. Component Declaration: Ensure that the component using MatDialog is declared in the correct module. If the component is used in multiple modules, make sure it is imported and declared in each of those modules.
4. Correct Usage: Double-check the syntax and usage of MatDialog functions and constructors in your component code. Ensure that you are calling the inject() function from the appropriate context.
5. Remove Unnecessary Code: If you have tried multiple solutions and the error persists, consider removing any unnecessary code related to MatDialog and starting fresh. Sometimes, a clean slate can help identify the root cause of the issue.

Remember to save your changes and restart your application to see if the error has been resolved. If not, double-check each step and review your code for any typos or syntax errors.

Conclusion

The “inject() must be called from an injection context” error in relation to MatDialog can be frustrating when you’re new to Angular. However, by carefully reviewing your imports, module declarations, and code usage, you can overcome this error and successfully implement MatDialog in your Angular application.