Скачать или смотреть How to Add Dynamic Background Color to Span Tags in Angular Views

Learn how to implement a `dynamic background color` feature for span tags in your Angular application using TypeScript and Pipes.
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This video is based on the question https://stackoverflow.com/q/64700802/ asked by the user 'ergondar' ( https://stackoverflow.com/u/14451038/ ) and on the answer https://stackoverflow.com/a/64701389/ provided by the user 'Stas Amasev' ( https://stackoverflow.com/u/11067476/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Add Dynamic Background Color to Span Tags in Angular Views

Adding dynamic color to elements in your Angular application can significantly enhance user experience, especially when dealing with varying data types. In this guide, we'll explore how to use a span tag in Angular to show document types, each having its own background color based on its type.

The Problem

Suppose you have a list of documents in your Angular component, and each document can belong to various types such as 'employee', 'salary', or 'contract'. The goal is to display these types in your UI with an appropriate background color that persists for each type. The challenge is to implement this functionality in a way that is efficient and maintainable.

For example:

All 'employee' document types should always have a green background.

All 'salary' document types should have a yellow background.

If there's a new document type, it should automatically get a new random color.

The Solution

To tackle this problem, we can create a custom Angular pipe that will generate a random color for each document type or retrieve a previously generated color if it already exists.

Step 1: Creating the Random Color Pipe

We'll start by creating a pipe in Angular that handles the colors for our document types.

Pipe Implementation

Here's how you can implement the RandomColorPipe:

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

Here’s what each part of the pipe does:

colors Map: This map stores the color associated with each document type.

getRandomColor Method: Generates a random hex color.

transform Method: Will return the existing color for a document type if it exists; otherwise, it generates a new random color.

Step 2: Using the Pipe in the Template

Now we can apply this pipe directly to our HTML where we display the document types.

HTML Structure

Modify your existing HTML to use the new pipe:

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

Explanation of the HTML

The *ngFor directive loops through each record in the records array.

The span for documentType uses the randomColor pipe, ensuring that the background color is dynamically fetched based on the record.documentType.

Conclusion

By following the steps outlined above, you are now able to apply dynamic background colors to your span tags based on document types in your Angular application. This approach not only keeps your UI visually appealing but also maintains code clarity and reuse.

Feel free to experiment with the colors or modify the pipe to suit your specific requirements. If you have any questions or need further assistance, don't hesitate to reach out!