JavaScript progress bar: Dynamic task completion tracking

Last update on April 17 2024 13:03:59 (UTC/GMT +8 hours)

JavaScript Event Handling: Exercise-8 with Solution

Write a JavaScript program to create a progress bar that updates its width based on task completion.

Sample Solution:

HTML and JavaScript Code:

<!DOCTYPE html>
<html>
<head>
  <style>
    .progress-bar {
      width: 300px;
      height: 20px;
      background-color: #f0f0f0;
      border-radius: 10px;
      overflow: hidden;
    }

    .progress-bar-fill {
      height: 100%;
      background-color: #4caf50;
      transition: width 0.3s;
    }
  </style>
</head>
<body>
  <div class="progress-bar">
    <div class="progress-bar-fill" id="progress"></div>
  </div>
  <script>
    function updateProgress(progressPercentage) {
      const progressBarFill = document.getElementById('progress');
      progressBarFill.style.width = `${progressPercentage}%`;
    }
    // Example usage: updating progress to 75%
    updateProgress(75);
  </script>
</body>
</html>

Output:

JavaScript progress bar: Dynamic task completion tracking.

Note: Executed on JS Bin

Explanation:

In the above exercise,

The HTML structure consists of a <div> element with a class of "progress-bar". This serves as the progress bar container. Inside this container, there is another <div> element with a class of "progress-bar-fill" and an id of "progress". This inner div represents the progress bar itself and will be dynamically updated to reflect progress.
The CSS styles defined in the <style> block specify the progress bar appearance. The "progress-bar" class sets the width, height, background color, border radius, and overflow properties. The "progress-bar-fill" class sets the height and background color, and includes a transition effect to smoothly update the width property.
The JavaScript code defines a function named "updateProgress" that takes a parameter called "progressPercentage". Inside the function, it retrieves the element with the id "progress" using document.getElementById('progress'). This element represents the progress bar fill.
At the end of the code, there is an example usage of the "updateProgress" function, setting the progress to 75% by calling updateProgress(75).

Flowchart:

Live Demo:

See the Pen javascript-event-handling-exercise-8 by w3resource (@w3resource) on CodePen.

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