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Resolving the Issue: Webpack Cannot Use jQuery Properly

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Описание к видео Resolving the Issue: Webpack Cannot Use jQuery Properly

Discover how to solve the common issue of `Webpack` not integrating with `jQuery`, and ensure your scripts run smoothly in the browser.
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This video is based on the question https://stackoverflow.com/q/62417180/ asked by the user 'bob' ( https://stackoverflow.com/u/13680446/ ) and on the answer https://stackoverflow.com/a/62417308/ provided by the user 'blex' ( https://stackoverflow.com/u/1913729/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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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.

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Why You Can't Use jQuery with Webpack Effectively

If you're using Webpack and jQuery together, you might run into an issue where jQuery simply doesn’t work as expected. This can be frustrating, especially if you've followed all the installation steps. Let's dive into the problem and understand how to resolve it, ensuring your jQuery code runs smoothly in your Webpack setup.

The Problem Breakdown

You’re using Webpack version 3 to bundle your JavaScript files, and after installing jQuery with npm, you try to manipulate the DOM by changing the background color of the body element. However, you encounter the following:

Nothing happens when trying to set CSS with jQuery.

Attempting to change the background color using document.body.style.backgroundColor returns an error: "cannot read property style of null."

Here’s a snapshot of your code for context:

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

Your HTML structure looks like this:

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

This setup leads to issues since the JavaScript tries to target elements that don't exist yet.

Understanding the Root Cause

The core issue here is related to the execution order of scripts. By placing your JavaScript <script> tag inside the <head> section, it executes before the body of the HTML is fully parsed. This results in:

document.body being null at the time your JavaScript runs.

Any attempt to manipulate the DOM leads to errors.

How to Solve the Issue

There are a couple of effective methods you can use to avoid this problem:

Method 1: Move the Script Placement

One straightforward solution is to move the <script> tag that includes your bundled JavaScript (bundle.js) to the end of your HTML, just before the closing </body> tag:

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

This ensures that the DOM is fully loaded before any JavaScript attempts to access it.

Method 2: Use Event Listeners

If you prefer to keep your script in the head, you can utilize event listeners to delay the execution of your JavaScript until the DOM is ready.

Using Vanilla JavaScript:

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

Using jQuery's Document Ready Function:

If you're already using jQuery, this is a clean and familiar approach:

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

Conclusion

By adjusting where you place your scripts or ensuring they execute only after the DOM is loaded, you can effectively resolve issues of jQuery not functioning with Webpack. This understanding will help you avoid common pitfalls and streamline your development process.

Now go ahead and implement these solutions, and you'll have a fully functional Webpack and jQuery setup!

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