Скачать или смотреть Adjust All Image Sizes to 400x300 in HTML with a Single JavaScript Code

Discover how to easily adjust the size of all images in your HTML file to `400x300` using a single JavaScript snippet, without styling files or IDs.
---
This video is based on the question https://stackoverflow.com/q/64073009/ asked by the user 'imida k' ( https://stackoverflow.com/u/4480617/ ) and on the answer https://stackoverflow.com/a/64073045/ provided by the user 'Angel Zlatanov' ( https://stackoverflow.com/u/14342112/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: image size adjust (no IDs) by a single javascript

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Adjusting Image Sizes in HTML with JavaScript

Have you ever found yourself needing to resize all images in your HTML document to a specific dimension, but got overwhelmed by the tasks of adding IDs or dealing with CSS files? Fear not! You can accomplish this simply and efficiently using JavaScript. In this guide, we will guide you through the process of adjusting the size of all images in your HTML file to 400x300 pixels using a single JavaScript code snippet that can be placed right at the top of your HTML file.

The Challenge

Imagine this scenario: you have multiple images in your HTML file, and you want them all to be resized to specific dimensions without going through the hassle of applying individual IDs or creating a separate CSS stylesheet. Here's a brief overview of the requirements:

Resize all images to 400x300 pixels

Utilize a single JavaScript code block

Avoid using additional files like CSS

No existing IDs for the images

The solution is easier than you think!

The Solution

To achieve the desired resize effect for all images without modifying each <img> tag individually, you can use the following JavaScript code snippet:

[[See Video to Reveal this Text or Code Snippet]]

Code Breakdown

Let’s break down the code to understand how it works:

window.addEventListener('DOMContentLoaded', ...): This line ensures that the script runs only after the entire DOM (Document Object Model) is fully loaded. This is crucial since you want to manipulate the images after they are all available in the document.

document.querySelectorAll('img'): This line selects all <img> elements in the document. The querySelectorAll method returns a NodeList of all images, which we can iterate through.

.forEach((img) => { ... }): The forEach method loops over each image in the NodeList, allowing us to perform actions on each individual image.

[img.width, img.height] = [400, 300]: This is a shortcut syntax for setting the width and height of each image to 400 and 300 pixels, respectively.

How to Implement

Follow these simple steps to implement the solution in your HTML file:

Open your HTML file in a text editor.

Insert the JavaScript code snippet at the top of your HTML file, within <script> tags.

Save the changes and open the HTML file in a web browser to see all images resized to the desired dimensions.

Example

Here's how your HTML might look after integrating the JavaScript:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By following the simple steps outlined above, you can easily adjust the size of all images in your HTML file to 400x300 pixels with just a single line of JavaScript code! This approach not only simplifies your code but also enhances the maintainability of your HTML documents. Happy coding!