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Discover how to effectively manipulate `CSS` properties in `jQuery` using simple `if` statements to create responsive designs based on viewport width.
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This video is based on the question https://stackoverflow.com/q/64129917/ asked by the user 'Jacob Likecocain' ( https://stackoverflow.com/u/14219248/ ) and on the answer https://stackoverflow.com/a/64130021/ provided by the user 'Pranav Rustagi' ( https://stackoverflow.com/u/14046126/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Mastering CSS Manipulation in jQuery with Conditional Statements

In the world of web design, creating a responsive layout that adapts to different screen sizes is essential. One common requirement is to adjust CSS properties dynamically, such as changing the margin of elements based on the viewport width. If you've ever wondered how to manipulate CSS with jQuery using if statements, you're in the right place! This guide will guide you through the process of achieving this effectively.

The Challenge

You might find yourself facing a scenario similar to this: you want to remove the left margin of your navigation bar when the viewport width is smaller than 800 pixels. While it can be easier to handle this with classes, it’s beneficial to learn how to manipulate CSS properties directly with jQuery.

Let's Define the Goal:

Remove the margin-left in the .navbar-brand class when the width is less than 800 pixels.

Add a margin-left of 100 pixels when the width is greater than or equal to 800 pixels.

Make sure these changes are responsive, allowing for adjustments when the window is resized.

The Solution

To achieve this, we’ll utilize jQuery to set up a function that adjusts the CSS properties based on the viewport size. Below, we’ll break down the solution into clear sections.

Step 1: Initial Setup

First, ensure you have jQuery included in your HTML file. Here’s a sample HTML snippet:

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

Step 2: Write the jQuery Logic

Now, let’s dive into the jQuery part. We need to create a function that will check the window width and apply the correct CSS:

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

Explanation of the Code:

$(document).ready(): Ensures that our function runs only after the document is fully loaded.

changeScrSize(): This function checks the current width of the window and applies the CSS changes:

If the width is less than 800 pixels, it removes the left margin (margin-left: 0).

If the width is greater than or equal to 800 pixels, it sets the left margin to 100 pixels.

$(window).on("resize", changeScrSize): This line ensures that the changes are re-evaluated whenever the window is resized, making sure our design remains responsive.

Step 3: CSS Styling

For visual clarity, ensure you have some basic styles applied to your navbar element:

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

Conclusion:

By following these steps, you can easily manipulate CSS properties using jQuery based on viewport width. This method not only enhances your skills in jQuery but also improves your ability to create dynamic, responsive designs.

Feel free to experiment and modify the code to fit your specific needs. Happy coding!