How to Fix Angular Material Navigation Error: undefined Segment Issue

Encountering the "requested path contains undefined segment" error in Angular Material? Discover how to resolve this issue for smooth navigation in your web app.
---
This video is based on the question https://stackoverflow.com/q/77309374/ asked by the user 'kaiszn' ( https://stackoverflow.com/u/4551104/ ) and on the answer https://stackoverflow.com/a/77309587/ provided by the user 'Parth M. Dave' ( https://stackoverflow.com/u/12119351/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Angular material, the requested path contains undefined segment at index 1

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/licensing
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/by-sa/4.0/ ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/by-sa/4.0/ ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
How to Fix Angular Material Navigation Error: undefined Segment Issue

As a new Angular developer, you may face several challenges while building your web applications. One common issue that can arise during development is the error: "The requested path contains undefined segment at index 1." If you're implementing an Angular Material table and trying to navigate based on the selected row's ID, you might be prone to this error. Let's dive into this issue and explore how to resolve it effectively.

Understanding the Problem

You are utilizing an Angular Material table where each row displays user data. Each user has a unique ID, and your goal is to navigate to a detail component when you click a button in the action column of the table. However, when you click the button, you receive an error and the URL shows http://localhost:4200/detail/undefined.

This indicates that the ID being passed to the router is undefined.

Analyzing the Cause

The root of the issue lies in how the button that triggers the navigation is defined within the Angular Material table. The button tries to reference the row.id, but if there isn't a proper context for row, it results in undefined. This typically occurs when the button is not correctly enclosed within the necessary cell definition structure.

Solution: Correcting the Button Placement

To resolve this issue, you need to ensure that your action buttons are nested correctly within the row's context. Here’s how you can modify your code:

Original HTML Code

Your current HTML code for the action column is structured as follows:

[[See Video to Reveal this Text or Code Snippet]]

Updated HTML Code

You need to ensure that the button code is encapsulated correctly so that it can reference the row object. Here’s the corrected structure:

[[See Video to Reveal this Text or Code Snippet]]

Why It Works

By placing the buttons within the *matCellDef directive and ensuring that let row is declared, the code has access to the context of the specific row being rendered. This means that when the button is clicked, it correctly references the row.id, preventing the undefined error.

Conclusion

Building your first Angular application is an exciting journey, but it comes with its set of challenges. The "requested path contains undefined segment" error is a common issue many developers encounter while implementing routing in conjunction with Angular Material components.

By following the solution outlined above, you can ensure that your buttons inside the Angular Material table are properly configured, allowing for successful navigation to the detail component without hitting the undefined error.

Take your time to test the changes, and you'll soon be able to enjoy seamless interactions in your web app. Happy coding!

Видео How to Fix Angular Material Navigation Error: undefined Segment Issue канала vlogize