Fixing the jQuery item.hasClass is not a function Error

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In this guide, we’ll break down why you’re seeing this error and how you can fix it to ensure your jQuery code runs smoothly.

The error arises when you try to call hasClass on an element that is not a jQuery object but rather a basic DOM element. In jQuery, methods like hasClass belong to jQuery objects, and trying to use them on a plain DOM element will result in the aforementioned error.

Here's a snippet of the problematic code:

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In this code, the variable item is a plain DOM element, which is why you are receiving the error.

The Solution: Use jQuery Wrapper

To resolve this issue, you need to wrap the item inside jQuery's $() function, which converts the DOM element into a jQuery object. Here’s the corrected version of the code:

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Explanation of the Changes

Wrapping the DOM Element: By using $(item), you convert the plain DOM element into a jQuery object. This allows you to use all the jQuery methods on it.

Adding Class: The addClass method now works without issues because it can be correctly called on a jQuery object, enabling the intended functionality of adding the 'passedLevel' class to the elements.

Sample Example for Better Understanding

Here is a simple example that shows how the fixed code operates in a more comprehensive setting.

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CSS for Visual Feedback

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JavaScript Code

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Debugging Tip

If you want to observe the difference between a plain DOM element and a jQuery object, you can add the following console log statements to your code:

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Conclusion