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
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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=''>

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 class="row">
      <div class="col-md-6">
        <button class="btn btn-danger form-control" onclick="inc()">+</button>
      <div class="col-md-6">
        <button class="btn btn-primary form-control" onclick="dec()">-</button>

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.


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(){
    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.

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