Increment and Decrement Counter in JavaScript

Increment and Decrement Counter in JavaScript
Code Snippet:Simple Counter
Author: Bona Tua
Published: January 20, 2024
Last Updated: January 22, 2024
Downloads: 701
License: MIT
Edit Code online: View on CodePen
Read More

This code demonstrates how to increment and decrement a counter in JavaScript. It works by using two functions, “inc()” and “dec()”, triggered by button clicks. The major functionality is to increase or decrease the displayed number, providing a simple interactive counter for your web page.

It’s helpful for tracking items, votes, or any numeric values, enhancing user engagement. The code provides a user-friendly way to increase or decrease counts with just a click.

How to Create Increment and Decrement Counters in JavaScript

1. First, include the necessary Bootstrap CSS by adding the provided CDN link within your HTML file’s head section.

<link rel='stylesheet' href='https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/css/bootstrap.min.css'>

2. Create the HTML structure for your counter using divs, buttons, and an initial count of 0.

<div class="container">
  <div class="col-md-3">
    <div class="jumbotron text-center">
      <h1 id="counter">0</h1>
    </div>
    <div class="row">
      <div class="col-md-6">
        <button class="btn btn-danger form-control" onclick="inc()">+</button>
      </div>
      <div class="col-md-6">
        <button class="btn btn-primary form-control" onclick="dec()">-</button>
      </div>
    </div>
  </div>
</div>

3. The CSS code is optional but enhances the counter’s appearance. It adds some padding to the top of the page. You can customize the styling according to your design preferences.

body{
  padding-top:50px;
}

4. Finally, let’s create the JavaScript functions to handle the increment and decrement actions. These functions manipulate the displayed counter value and ensure it doesn’t go below zero.

function inc(){
  counter.innerHTML = parseInt(counter.innerHTML)+1;
}
function dec(){
  if(parseInt(counter.innerHTML)>0)
    counter.innerHTML = parseInt(counter.innerHTML)-1;
}
var counter = document.getElementById("counter");

That’s all! hopefully, you have successfully created an increment and decrement counter in JavaScript. If you have any questions or suggestions, feel free to comment below.

Leave a Comment

This site uses Akismet to reduce spam. Learn how your comment data is processed.

About CodeHim

Free Web Design Code & Scripts - CodeHim is one of the BEST developer websites that provide web designers and developers with a simple way to preview and download a variety of free code & scripts. All codes published on CodeHim are open source, distributed under OSD-compliant license which grants all the rights to use, study, change and share the software in modified and unmodified form. Before publishing, we test and review each code snippet to avoid errors, but we cannot warrant the full correctness of all content. All trademarks, trade names, logos, and icons are the property of their respective owners... find out more...

Please Rel0ad/PressF5 this page if you can't click the download/preview link

X