Cocktail Sort Visualizer using JavaScript

Last Updated : 16 Jun, 2023

Cocktail Sort is a variation of Bubble Sort. Cocktail Sort traverses through a given array in both directions alternatively. In order to know more about it. Please refer to Cocktail Sort.

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

Pre-requisites:

Cocktail 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(red) & sorted(lightgreen).
Button Cocktail Sort the elements using the selection sort algorithm.
Finally, elements are sorted.

Example: Click on the “Generate New Array” button to generate a new random array. Click the Cocktail Sort button to perform Visualization.

HTML

<!DOCTYPE html>
<html lang="en">
<!-- head -->
 
<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>Cocktail Sort Visualizer</title>
 
    <!-- linking style.css -->
    <link href="style.css" rel="stylesheet" />
</head>
<!-- body -->
 
<body>
    <section class="head">Cocktail Sort</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>
 
        <!-- "Cocktail Sort" button -->
        <button class="btn2"
                onclick="CocktailSort(),disable()"
                id="Button2">
            Cocktail Sort
        </button>
    </div>
      <!-- linking script.js -->
    <script src="script.js"></script>
</body>
 
</html>

CSS

/*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;
}

Javascript

//script.js
 
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 "Cocktail Sort"
async function CocktailSort(delay = 600) {
    let bars = document.querySelectorAll(".bar");
 
    // Initialize swapped with true
    let swapped = true;
 
    // Initialize s with zero
    let s = 0;
 
    // Initialize e with 20
    let e = 20;
 
    while (swapped == true) {
        swapped = false;
 
        for (let i = s; i < e - 1; i++) {
 
            // Assigning value of ith bar into value1
            let value1 = parseInt(bars[i]
                         .childNodes[0].innerHTML);
 
            // Assigning value of i+1th bar into value2
            let value2 = parseInt(bars[i + 1]
                         .childNodes[0].innerHTML);
 
            // To pause the execution of code for 300 milliseconds
            await new Promise((resolve) => setTimeout(() => {
                resolve();
            }
 
                , 300));
 
            // Provide red color to the ith bar
            bars[i].style.backgroundColor = "red";
 
            // Provide red color to the i+1th bar
            bars[i + 1].style.backgroundColor = "red";
 
            if (value1 > value2) {
                let temp1 = bars[i].style.height;
                let temp2 = bars[i].childNodes[0].innerText;
 
                // To pause the execution of code for 300 milliseconds
                await new Promise((resolve) => setTimeout(() => {
                    resolve();
                }
 
                    , 300));
 
                // Swap ith bar with (i+1)th bar
                bars[i].style.height = bars[i + 1].style.height;
                bars[i].childNodes[0].innerText = 
                bars[i + 1].childNodes[0].innerText;
                bars[i + 1].style.height = temp1;
                bars[i + 1].childNodes[0].innerText = temp2;
 
                // Set swapped
                swapped = true;
            }
 
            // To pause the execution of code for 300 milliseconds
            await new Promise((resolve) => setTimeout(() => {
                resolve();
            }
 
                , 300));
 
            // Provide skyblue color to the ith bar
            bars[i].style.backgroundColor = "rgb(0, 183, 255)";
 
            // Provide skyblue color to the i+1th bar
            bars[i + 1].style.backgroundColor = "rgb(0, 183, 255)";
        }
 
        if (swapped == false) {
            break;
        }
 
        // Set swapped false
        swapped = false;
 
        e = e - 1;
 
        for (var i = e - 1; i >= s; i--) {
 
            // Assigning value of ith bar into value1
            let value1 = parseInt(bars[i]
                         .childNodes[0].innerHTML);
 
            // Assigning value of i+1th bar into value2
            let value2 = parseInt(bars[i + 1]
                         .childNodes[0].innerHTML);
 
            // To pause the execution of code for 300 milliseconds
            await new Promise((resolve) => setTimeout(() => {
                resolve();
            }
 
                , 300));
 
            // Provide red color to the ith bar
            bars[i].style.backgroundColor = "red";
 
            // Provide red color to the i+1th bar
            bars[i + 1].style.backgroundColor = "red";
 
            if (value1 > value2) {
                let temp1 = bars[i].style.height;
                let temp2 = bars[i].childNodes[0].innerText;
 
                // To pause the execution of code for 300 milliseconds
                await new Promise((resolve) => setTimeout(() => {
                    resolve();
                }
 
                    , 300));
 
                // Swap ith bar with (i+1)th bar
                bars[i].style.height = bars[i + 1].style.height;
                bars[i].childNodes[0].innerText = 
                bars[i + 1].childNodes[0].innerText;
                bars[i + 1].style.height = temp1;
                bars[i + 1].childNodes[0].innerText = temp2;
 
                // Set swapped
                swapped = true;
            }
 
            // To pause the execution of code for 300 milliseconds
            await new Promise((resolve) => setTimeout(() => {
                resolve();
            }
 
                , 300));
 
            //Provide skyblue color to the ith bar
            bars[i].style.backgroundColor = "rgb(0, 183, 255)";
 
            // Provide skyblue color to the i+1th bar
            bars[i + 1].style.backgroundColor = "rgb(0, 183, 255)";
        }
 
        s = s + 1;
    }
 
    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 "Cocktail 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 "Cocktail Sort"
    document.getElementById("Button2")
    .disabled = true;
    document.getElementById("Button2")
    .style.backgroundColor = "#d8b6ff";
}

Output:

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