Скачать или смотреть How to Conditionally Format Values in Angular Material Tables

Learn how to apply conditional formatting to values in Angular Material Tables. Use Angular pipes for formatting like currency and number based on your data structure.
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Mastering Conditional Formatting in Angular Material Tables

When working with Angular Material Tables, managing the aesthetic and presentation of data can become a challenge, especially when dealing with a large number of columns and varying data types. Conditional formatting allows developers to enhance the visual appeal and comprehension of important data in their application. This guide will guide you on how to implement conditional formatting for values in an Angular Material Table using Angular pipes.

Introduction to Angular Material Tables

Angular Material provides a powerful table component, mat-table, which is extremely versatile in displaying complex data structures. The flexibility of being able to define columns dynamically through data structures, such as JSON, makes it easier to manage large datasets that may contain numerous columns. However, the challenge arises when you want to format these values conditionally based on their types or business logic.

The Problem: How to Conditionally Format Values

You may have a scenario where you want to display different formats for your table's cell values. For instance:

A value might need to be displayed as currency.

Another value might represent a number that should be formatted accordingly.

Some values should be represented without any specific formatting.

In the case presented, you have a dispFormat property that determines how each column's values should be formatted, which could be one of the following:

An empty string (no formatting)

currency (for currency formatting)

number (for number formatting)

Despite having this setup, you might run into errors when trying to implement *ngIf directives directly in the mat-cell, which can lead to frustrating issues like ERROR TypeError: Cannot read property 'template' of undefined. Let’s explore how to solve this.

An Effective Solution: Using Divs with ngIf

The key to properly applying conditional formatting lies in placing the *ngIf inside the mat-cell rather than trying to use multiple ng-container or templates. This allows you to display different formats conditionally while avoiding type errors.

Implementation Steps

Here’s how you can implement the solution in your Angular template:

Define the Table Structure: Ensure you have your mat-table, column definitions, and data source set up correctly.

Use Divs for Conditional Formatting: Utilize div tags within your mat-cell to implement the conditional logic.

Here’s the corrected code for the mat-table including the conditional formatting:

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

Explanation of the Code

The mat-table is set up with a data source bound to queryResults.

We iterate over displayedColumns to define the columns dynamically.

Inside each mat-cell, we use multiple div elements with the *ngIf directive. Each div checks the dispFormat and applies the appropriate Angular pipe:

Currency formatting for financial figures using the currency pipe.

Number formatting for numerical values using the number pipe.

A straight display of the value when no specific formatting is necessary.

Conclusion

In this guide, we addressed how to use conditional formatting within Angular Material Tables effectively. By structuring our mat-cell to accommodate multiple conditions for formatting, we can present our data in a more reader-friendly way without encountering type errors. Conditional formatting can significantly improve data readability and enhance user experience in your Angular applications.

Feel free to implement this solution and customize the formatting further to suit your application’s needs!