Скачать или смотреть Resolving innerWidth and innerHeight Calculations in JavaScript Without setInterval or setTimeout

Learn how to calculate the `innerWidth` and `innerHeight` of the browser window using just JavaScript functions without relying on `setInterval` or `setTimeout`.
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This video is based on the question https://stackoverflow.com/q/72613491/ asked by the user 'Soumya Roy' ( https://stackoverflow.com/u/17396777/ ) and on the answer https://stackoverflow.com/a/72613878/ provided by the user 'chrwahl' ( https://stackoverflow.com/u/322084/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding innerWidth and innerHeight Calculations in JavaScript

When working on web applications, there are times you need to dynamically adjust certain elements based on the size of the browser window. This is particularly critical for responsive designs and ensuring that your website looks good on all devices. A common way to obtain the current dimensions of the window is by using innerWidth and innerHeight. However, developers often run into a question: How can these dimensions be accurately captured without relying on the setInterval or setTimeout functions?

In this article, we'll walk through how to achieve this using JavaScript event listeners, effectively creating a more efficient and responsive solution.

The Problem with setInterval and setTimeout

Many users, especially those new to JavaScript, might implement setInterval or setTimeout to get window dimensions. This is not only ineffective but also resource-heavy, because it checks dimensions repeatedly over time. Furthermore, using these methods can cause delays in executing the function because they're timed events.

Here's an example snippet that illustrates this issue:

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

This code successfully retrieves the window dimensions but runs indefinitely, which is not ideal for performance.

A Better Approach: Using Event Listeners

Instead of relying on timed functions, we can leverage JavaScript's event listeners to invoke our dimension calculation function. By doing so, we ensure that the function executes only when the specific conditions are met, such as when the DOM is fully loaded or when the window is resized.

Step-by-Step Solution

Define the Update Function

We'll create a function that will update the CSS properties based on the window dimensions:

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

Add Event Listeners

Attach event listeners to the DOMContentLoaded event on the document and the resize event on the window:

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

HTML Structure Example

Ensure you have an HTML element to manipulate, such as:

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

Complete Code Example

Here's how everything fits together:

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

Conclusion

By utilizing event listeners, we create a streamlined approach that is not only efficient but enhances the user experience without the overhead caused by continuous checks. This method will trigger updates at just the right moments, such as when the page loads or when the browser is resized, ensuring that your elements always match the current dimensions of the viewport. Implementing these changes can significantly improve the performance of your web applications.

If you want to create a responsive design that adapts to different screen sizes, integrating these JavaScript functions is a step in the right direction. Happy coding!