Скачать или смотреть How to Fix Cannot Set Style Attribute Value Issue in JavaScript / TypeScript

Learn how to effectively apply styles to HTML elements in JavaScript and TypeScript, solving common issues with setting style attributes.
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This video is based on the question https://stackoverflow.com/q/62563867/ asked by the user 'FutureCake' ( https://stackoverflow.com/u/5716477/ ) and on the answer https://stackoverflow.com/a/62564103/ provided by the user 'Barmar' ( https://stackoverflow.com/u/1491895/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Fix Cannot Set Style Attribute Value Issue in JavaScript / TypeScript

When working with JavaScript and TypeScript, you may encounter various problems, especially when trying to manipulate the DOM. One common issue is trying to set the style of an HTML element from an object, but the styles don’t apply as expected. In this guide, we’ll break down a specific problem encountered while setting style attributes and provide a solution to ensure your styles apply correctly.

The Problem at Hand

Imagine you are building a function that creates DOM elements dynamically. You have a setup to parse properties, including styles, from an object to be applied to these elements. However, despite logging the correct output in your console, the styles refuse to take effect.

Here’s a brief overview of the problematic code:

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

The main issue arises because the line el[key] = properties[key]; overwrites the styles that you just applied, resulting in them not being rendered correctly.

The Solution

Separate Your Style and Non-Style Properties

To remedy this, you need to prevent the overwriting of style properties. The key is to move the line that assigns non-style properties (el[key] = properties[key];) into an else block. This ensures that it only executes when the property is not a style.

Modified Code

Here’s how you can modify the function:

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

Explanation of Changes

Conditionally Assign Properties: By introducing the else condition, you ensure that the non-style properties only set when the current key does not correspond to 'style'. This prevents the unintended overwriting of any styles you assign previously.

Maintain Clarity: Keeping code organized and clear enhances readability and reduces chances of bugs, making it easier for future developers (or yourself) to understand the logic behind the element creation.

Conclusion

By making this simple change, you should be able to successfully apply styles to your HTML elements dynamically without losing them to overwriting. Always remember that separating concerns in your code can lead to fewer errors and easier maintenance down the road.

If you have any more questions about JavaScript or TypeScript, or if you need further clarification on this solution, feel free to reach out! Happy coding!