Gnome Sort Visualizer using JavaScript

Last Updated : 05 Jun, 2023

In this article, we are going to learn Gnome sort Visualizer using javascript, Gnome Sort also called Stupid sort, is based on the concept of a Garden Gnome sorting his flower pots. In order to know more about it. Please refer to Gnome Sort.

An algorithm like Gnome Sort can be easily understood by visualizing instead of long codes. In this article, Gnome Sort Visualizer is implemented using HTML, CSS & JavaScript.

Pre-requisites:

Gnome Sort.
Basic HTML, CSS & JavaScript.
JavaScript promises.
JavaScript async/await function.

Approach:

Button Generate New Array generates an array of random values using the Math.random() function and a bar corresponding to that value in terms of height.
Different colors are used to indicate which elements are unsorted(sky-blue), compared(darkblue & red) & sorted(lightgreen).
Button Gnome Sort the elements using the Gnome sort algorithm.
Finally, elements are sorted.

Example: In this example, we are using the above-explained approach.

HTML

<!--Filename: index.html -->
<!DOCTYPE html>
<html lang="en">
<head>
       <meta charset="UTF-8" />
       <meta name="viewport" content="width=device-width, 
       initial-scale=1.0" />
       <meta http-equiv="X-UA-Compatible" content="ie=edge" />
       <!-- Title -->
       <title>Gnome Sort Visualizer</title>
       <!-- Linking style.css -->
       <link href="style.css" rel="stylesheet" />
</head>
 
<body>
       <section class="head">Gnome Sort Visualizer</section>
       <section class="data-container"></section>
       <section id="ele"></section>
       <div style="margin: auto; width: fit-content">
              <!-- "Generate New Array" button -->
              <button class="btn1"
                      onclick="generate()"
                      id="Button1">
                     Generate New Array
              </button>
              <!-- "Gnome Sort" button -->
              <button class="btn2"
                      onclick="CombSort(),disable()"
                      id="Button2">
                     Gnome Sort
              </button>
       </div>
       <script src="script.js"></script>
</body>
</html>

File name: style.css

CSS

/* filename: style.css */
.mySlides {
    display: none;
}
 
body {
    background-color: rgb(255, 235, 211);
    font-family: Verdana, sans-serif;
}
 
.head {
    margin-top: 20px;
    margin-right: 20vw;
    margin-left: 20vw;
    text-align: center;
    font-size: 30px;
    background-color: #6f459e;
    color: white;
    border-radius: 19px;
    font-weight: bolder;
}
 
.data-container {
    width: 600px;
    height: 364px;
    position: relative;
    margin: 0 auto;
}
 
.bar {
    width: 28px;
    position: absolute;
    left: 0;
    bottom: 0;
    background-color: rgb(0, 183, 255);
    transition: 0.2s all ease;
}
 
.bar__id {
    position: absolute;
    top: -24px;
    width: 100%;
    text-align: center;
}
 
.btn1 {
    padding: 12px;
    font-weight: bolder;
    background-color: #6f459e;
    border-radius: 10px;
    color: white;
    font-size: 16px;
    border: white;
    margin-top: 1vw;
    margin-right: 1vw;
}
 
.btn2 {
    padding: 12px;
    font-weight: bolder;
    background-color: #6f459e;
    border-radius: 10px;
    color: white;
    font-size: 16px;
    border: white;
}
 
#ele {
    text-align: center;
    height: 35px;
}

Filename: script.js

Javascript

// script.js File 
const container = document.querySelector(".data-container");
 
// Function to generate bars
function generatebars(num = 20) {
 
    // For loop to generate 20 bars
    for (let i = 0; i < num; i += 1) {
 
        // To generate random values from 1 to 100
        const value = Math.floor(Math.random() * 100) + 1;
 
        // To create element "div"
        const bar = document.createElement("div");
 
        // To add class "bar" to "div"
        bar.classList.add("bar");
 
        // Provide height to the bar
        bar.style.height = `${value * 3}px`;
 
        // Translate the bar towards positive X axis
        bar.style.transform = `translateX(${i * 30}px)`;
 
        // To create element "label"
        const barLabel = document.createElement("label");
 
        // To add class "bar_id" to "label"
        barLabel.classList.add("bar__id");
 
        // Assign value to "label"
        barLabel.innerHTML = value;
 
        // Append "Label" to "div"
        bar.appendChild(barLabel);
 
        // Append "div" to "data-container div"
        container.appendChild(bar);
    }
}
 
// Asynchronous function to perform "Gnome Sort"
async function CombSort(delay = 600) {
    let bars = document.querySelectorAll(".bar");
 
    let pos = 0;
 
    while (pos < 20) {
        if (pos == 0) {
            pos++;
        }
 
        // Assigning value of posth bar into value1
        let value1 = parseInt(bars[pos].childNodes[0].innerHTML);
 
        // Assigning value of pos-1th bar into value1
        let value2 = parseInt(bars[pos - 1].childNodes[0].innerHTML);
 
        // Comparing value1 and value2
        if (value1 >= value2) {
            pos++;
        } else {
 
            // Provide red color to the posth bar
            bars[pos].style.backgroundColor = "red";
 
            // Provide red color to the pos-1th bar
            bars[pos - 1].style.backgroundColor = "red";
 
            // Swap posth bar with (pos-1)th bar
            let temp1 = bars[pos].style.height;
            let temp2 = bars[pos].childNodes[0].innerText;
 
            // To pause the execution of code for 300 milliseconds
            await new Promise((resolve) =>
                setTimeout(() => {
                    resolve();
                }, 300)
            );
 
            // Swap posth bar with (pos-1)th bar
            bars[pos].style.height = bars[pos - 1].style.height;
            bars[pos].childNodes[0].innerText =
                bars[pos - 1].childNodes[0].innerText;
            bars[pos - 1].style.height = temp1;
            bars[pos - 1].childNodes[0].innerText = temp2;
            pos--;
        }
 
        // To pause the execution of code for 300 milliseconds
        await new Promise((resolve) =>
            setTimeout(() => {
                resolve();
            }, 300)
        );
 
        // Providing skyblue color
        for (let x = 0; x < 20; x++) {
            bars[x].style.backgroundColor = "rgb(0, 183, 255)";
        }
    }
 
    // Providing lightgreen color
    for (let x = 0; x < 20; x++) {
        bars[x].style.backgroundColor = "rgb(49, 226, 13)";
    }
 
    // To enable the button "Generate New Array" after final(sorted)
    document.getElementById("Button1").disabled = false;
    document.getElementById("Button1").style.backgroundColor = "#6f459e";
 
    // To enable the button "Gnome Sort" after final(sorted)
    document.getElementById("Button2").disabled = false;
    document.getElementById("Button2").style.backgroundColor = "#6f459e";
}
 
// Call "generatebars()" function
generatebars();
 
// Function to generate new random array
function generate() {
    window.location.reload();
}
 
// Function to disable the button
function disable() {
 
    // To disable the button "Generate New Array"
    document.getElementById("Button1").disabled = true;
    document.getElementById("Button1").style.backgroundColor = "#d8b6ff";
 
    // To disable the button "Gnome Sort"
    document.getElementById("Button2").disabled = true;
    document.getElementById("Button2").style.backgroundColor = "#d8b6ff";
}