Скачать или смотреть How to Repeat Button Clicks in JavaScript for Accumulating Display Values

Learn how to create a JavaScript function that allows displaying the cumulative value of button clicks on your web page effectively.
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This video is based on the question https://stackoverflow.com/q/63925736/ asked by the user 'Parham' ( https://stackoverflow.com/u/13777558/ ) and on the answer https://stackoverflow.com/a/63925793/ provided by the user 'Andre Figueiredo' ( https://stackoverflow.com/u/986862/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding Button Clicks in JavaScript

Have you ever wanted to create a feature on your website where clicking a button repeatedly results in an accumulation of values shown on the screen? This is a common requirement in many applications, especially in calculators or number input forms.

In this guide, we’ll walk through a practical example to demonstrate how you can achieve this with JavaScript. We’ll explore how a button click can not only display a number but also keep adding to it every time it’s clicked.

The Problem: Displaying Number Clicks

Consider the following scenario: when you click a button, you want its value to be displayed on the screen. For instance, when you click the button labeled "1", it should show "1", and clicking "2" should add that to the display. This is indeed a basic yet very useful feature in many applications.

Sample Code Structure

Here’s a brief look at the initial implementation you might have:

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

And the corresponding JavaScript to handle the click event:

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

The Solution: Appending Button Values

The issue with the above code is that it overwrites the current display value every time a button is clicked. To resolve this, we need to modify the JavaScript so that clicking a button appends its value to the display instead.

Step-by-step Solution

Here’s how to adjust the showNumber function:

Replace the InnerHTML Assignment: Instead of replacing the content of the display, we will append the new button's value to the existing display value.

Updated Code Snippet:

Change your showNumber function to use the + = operator, as shown below:

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

Final Code Implementation

Here is the complete implementation with the new logic:

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

Conclusion

With this simple modification, your button clicks will now accumulate displayed values rather than overwrite them. This flexible approach enhances interactivity on your website and adds significant utility to your JavaScript applications.

By mastering this, you'll be well on your way to creating more complex interactive elements. Happy coding!