How to Get the Total of NgFor Items in Angular

Discover an easy approach to calculate the total of leave types in Angular using NgFor. This guide provides code snippets and explanations for a seamless solution.
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How to Get the Total of NgFor Items in Angular: A Step-by-Step Guide

When building applications in Angular, you might encounter scenarios where you need to display statistical data, such as leave counts. If you have an array of leave types and need to calculate the total for each type, this post will guide you through the steps to achieve that using Angular's NgFor directive.

The Challenge: Calculating Leave Totals

Imagine you have a data structure containing leave records for different months. Your objective is to display the total counts of each leave type at the bottom of a table. The leave data is structured as follows:

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You can see that each month has records for different leave types like Work From Home (WFH) and Casual Leave (CL). The task is to calculate the totals for each leave type and display them in the footer of your table.

The Solution: Implementing the Logic

We will break down the solution into two major parts: modifying your HTML file and updating your TypeScript file with a new function to calculate totals.

Step 1: Modifying the HTML Template

Here’s how you can set up the HTML table to include the total counts in the footer. This includes using a new method to get totals directly from your data.

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

Step 2: Defining the Total Function in TypeScript

Now we need to define the total() method in your TypeScript file. This method will go through the leaves object and compute the total for the specified leave type.

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

Explanation of the Code

HTML Table Structure: The HTML table is structured to display leave counts per month using the NgFor directive. The tfoot section is added to compute and display total counts for each leave type (CL and EL).

The total Method:

Initialization: It initializes a sum variable to zero.

Loop through Leave Types: It uses Object.keys() to iterate through the leave records. For each leave type, it checks if it exists and sums it up.

Returning the Sum: Finally, it returns the total value.

Conclusion

By following the above steps, you can efficiently calculate the totals of each leave type in Angular and display them in your HTML using NgFor. This approach not only simplifies your code but also makes it maintainable and easy to understand. Now you can present your leave data in an organized and insightful manner.

If you have any questions or need further assistance, feel free to drop a comment below!

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