Скачать или смотреть How to Set a Different Bootstrap Class Based on Condition in Vue

Learn how to use `Vue.js` to conditionally set your `Bootstrap` classes for responsive layouts. Discover the best practices and examples using `isIndividual` to determine column sizes.
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This video is based on the question https://stackoverflow.com/q/70079736/ asked by the user 'Steve' ( https://stackoverflow.com/u/4971859/ ) and on the answer https://stackoverflow.com/a/70079803/ provided by the user 'Mah Es' ( https://stackoverflow.com/u/14704020/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Set a Different Bootstrap Class Based on Condition in Vue

Vue.js is a progressive JavaScript framework that makes working with user interfaces easy. One common use case developers encounter is the need to set different Bootstrap class names based on certain conditions. In this guide, we will tackle this issue by leveraging Vue.js's reactive features to create dynamic layouts.

The Problem: Conditional Class Assignment

Imagine you have a layout where a component should display either a single column or two columns based on a certain condition. In this particular case, we will use a boolean value called isIndividual. If isIndividual is true, you'd like to apply the Bootstrap class .col-md-12, making the component take up the entire width. Conversely, if isIndividual is false, you want to use .col-md-6, which allows the component to display two columns next to each other.

Here’s a basic structure of what the problem looks like in code:

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

Despite your effort, this approach doesn’t work as expected when isIndividual is true. This may leave you scratching your head wondering what went wrong.

The Solution: Using Ternary Operators

The good news is that Vue.js provides a straightforward solution using the :class binding which allows dynamic class assignment based on conditions. Here’s how you can effectively manage this using a ternary operator:

Step-By-Step Implementation

HTML Structure: You'll need to define a single div element where the Bootstrap class will be conditionally applied.

Using Ternary Operator: Instead of separate div elements for each condition, you can simplify it into one with a dynamic class.

Here's the correct implementation:

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

Explanation of the Code

:class Directive: The :class syntax in Vue.js allows you to bind a class name dynamically. When you use isIndividual ? 'col-md-12' : 'col-md-6', you are effectively saying:

If isIndividual is true, apply the class col-md-12,

If isIndividual is false, apply the class col-md-6.

Row and Column Structure: The row class from Bootstrap is used to structure your grid layout, while the column classes adjust the layout according to the responsive design principles.

Conclusion

Using Vue.js to set Bootstrap classes dynamically makes managing layouts intuitive and flexible. By applying the ternary operator, as we discussed, you can create responsive designs that adapt to your application's needs. No longer are you restricted to static class names based on predefined conditions. Experiment with this technique and see how it enhances your Vue.js applications!

Now that you understand how to conditionally set Bootstrap classes, you can easily implement and modify them according to your requirements. Happy coding!