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Learn how to seamlessly add a `timestamp` to your exported filenames when using the MatTable exporter in Angular for better file management and organization.
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How to Add Timestamp in Filename While Exporting MatTable Components in Angular

When working with Angular applications that utilize the Material Design library, many developers find themselves needing to export tabular data for various purposes. A common requirement in these scenarios is enhancing the exported filename for better traceability — particularly, adding a timestamp. In this guide, we'll explore how you can accomplish this while working specifically with the mat-table-exporter npm module.

The Problem: Adding a Timestamp

You've successfully set up the mat-table-exporter for exporting your MatTable components. Here’s how you initially set up the export function:

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

While this works great for a static filename, you want to dynamically include a timestamp in your exported filename, such as test-YYYY-MM-DDTHH:mm:ss.sssZ. However, your attempts to directly interpolate new Date() in the filename within the HTML template have been met with compile-time errors:

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

The Solution: Moving Logic to the Component File

Step 1: Move Export Logic to the TypeScript File

A cleaner and more maintainable approach is to handle the export function within your TypeScript component file. This not only makes debugging easier but also allows more flexibility over how the export logic is defined, including the dynamic filename generation.

Here’s how you can implement this:

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

Step 2: Update the Template

Now that you have encapsulated the export logic in its own method, you can simplify the HTML button. Just call the new exportTable method:

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

Explanation of the Code

new Date().toISOString(): This method generates a string representation of the date in ISO format, which is both standardized and easy to read. It gives you the full date and time down to milliseconds, making it perfect for filenames.

Props: This optional parameter allows you to add additional information like the author’s name when exporting your data.

Benefits of This Approach

Readability and Maintenance: By moving the export logic to the TypeScript file, you keep your HTML clean and enhance the maintainability of your code.

Flexibility: Modifications can easily be made to the export functionality, such as changing the file format or exporting different data types, without complex changes in the template.

Conclusion

By implementing the timestamp as part of your exported filename through a dedicated function in your Angular component, you streamline your code and enhance the organization of your exported files. This simple change not only improves the naming convention but also makes your data exports more useful and manageable.

By following the steps outlined in this guide, you should find it straightforward to set up timestamps in your exported filenames using the mat-table-exporter module. Happy coding!