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Learn how to effectively manage product listings and dynamically update the total billing amount in an HTML table using jQuery, making your web applications more interactive and user-friendly.
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How to Perform Subtraction in HTML Table Using jQuery

When you’re developing a web application that has an interactive billing system, managing totals dynamically can pose challenges. In particular, when users remove items from a list, the system must accurately reflect the current total amount. If you've faced this issue, you're not alone! In this guide, we'll explore a problem linked to managing totals in an HTML table, followed by a structured solution using jQuery.

Understanding the Problem

Suppose you're working with an HTML table that lists products along with their quantities and prices. As you add items to the table, it successfully calculates the total amount. However, when an item is removed, the total doesn't get updated as expected. For instance:

**Initial Total: **

Fountain Pen: Quantity 6, Price 6, Amount 36

Pencil: Quantity 5, Price 5, Amount 25

Total Bill: 71

After removing the Pencil, the total should automatically update to 36, but it continues to show 71. This indicates a need for proper event handling and calculation functionality.

The Solution

To address this problem, we want a clean, efficient way to recalculate the total when actions occur. Below are the steps to implement this using jQuery.

Step 1: Calculate Total on Adding an Item

When an item is added, we need to ensure we calculate the total amount that reflects the new product added to the list. Here’s how to do it:

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

Step 2: Clear the Form

After successfully adding a product to the list, clear the input fields to help the user add new items without confusion:

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

Step 3: Remove an Item and Update Total

Next, we need to update the total when an item is removed. It’s essential to store the line total when creating the delete button for each product row:

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

Now create a function to calculate the total amount whenever an item is deleted:

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

Step 4: Bind the Delete Functionality

When the delete button is clicked, not only should the item fade out and be removed from the DOM, but also call the calc_total() function to update the total bill displayed:

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

Conclusion

By following the above steps, you can effectively manage product listings in a web application, dynamically updating the total billing amount in an HTML table using jQuery. This enhances user experience and ensures that all calculations remain precise and responsive.

With this approach, you’ll have a single, consistent function for calculating the total amount, making your code much cleaner and manageable. Implementing this functionality will improve your application’s efficiency and the satisfaction of your users.

If you have any questions or need further assistance, please feel free to reach out for help!