Tell Whether Video Is Loaded Or Not In Javascript

One of the essential features in web development is checking whether a video has been fully loaded on a webpage using JavaScript. It's crucial to know whether a video has loaded to ensure a seamless user experience without interruptions while viewing content.

Fortunately, with JavaScript, you can easily detect when a video has finished loading. This can be achieved by monitoring the video's readyState property. The readyState property provides information about the current state of the video element, indicating whether it's still loading or has already loaded.

To check if a video is loaded using JavaScript, you can follow these steps:

1. Access the video element in your HTML document using JavaScript. You can do this by using the document.getElementById() method and passing the ID of the video element as an argument.

2. Once you have accessed the video element, you can then check its readyState property to determine its loading status. The readyState property has different values that represent different states of the video element:
- 0: HAVE_NOTHING - No information about the media resource is available.
- 1: HAVE_METADATA - Metadata for the media resource is available.
- 2: HAVE_CURRENT_DATA - Data for the current playback position is available, but not enough data to play next frame.
- 3: HAVE_FUTURE_DATA - Data for the current and at least the next frame is available.
- 4: HAVE_ENOUGH_DATA - Enough data available to start playing.

3. To detect when the video has finished loading, you can listen for the 'loadeddata' event on the video element. This event is triggered when the browser has loaded the current frame of the video.

Here is an example code snippet that demonstrates how to check if a video has finished loading:

const videoElement = document.getElementById('myVideo');

videoElement.addEventListener('loadeddata', () => {
  if (videoElement.readyState === 4) {
    console.log('Video has finished loading.');
  } else {
    console.log('Video is still loading.');
  }
});

By using the code snippet above, you can determine whether a video has loaded in JavaScript. This approach allows you to take further actions based on the loading status of the video, ensuring a smooth playback experience for users on your website.

In conclusion, being able to tell whether a video is loaded on a webpage is an important aspect of web development. By leveraging JavaScript and monitoring the video element's readyState property, you can easily detect when a video has finished loading and provide a seamless experience for your website visitors.