Swiftorial Logo
Home
Swift Lessons
Matchups
CodeSnaps
Tutorials
Career
Resources

VueJS - Conditional Classes and Styles

Using Conditional Classes and Styles in VueJS

Conditional classes and styles in VueJS allow you to apply CSS classes and inline styles dynamically based on your application's state. This guide covers the basics of using conditional classes and styles in VueJS, including object and array syntax, and using computed properties for dynamic bindings.

Key Points:

  • Conditional classes and styles allow you to dynamically apply CSS classes and inline styles based on data properties.
  • Object syntax and array syntax provide flexible ways to conditionally bind classes and styles.
  • Computed properties can be used for more complex conditional logic and dynamic bindings.

Conditional Class Binding

Object Syntax

Use object syntax to conditionally bind classes:


// JavaScript
const app = new Vue({
  el: '#app',
  data: {
    isActive: true,
    hasError: false
  }
});





  

    This is a conditional class binding example.

Array Syntax

Use array syntax to conditionally bind multiple classes:


// JavaScript
const app = new Vue({
  el: '#app',
  data: {
    activeClass: 'active',
    errorClass: 'text-danger',
    isActive: true,
    hasError: false
  }
});





  

    This is an array conditional class binding example.

Conditional Style Binding

Object Syntax

Use object syntax to conditionally bind inline styles:


// JavaScript
const app = new Vue({
  el: '#app',
  data: {
    isLarge: true,
    hasColor: false
  }
});





  

    This is a conditional style binding example.

Array Syntax

Use array syntax to conditionally bind multiple style objects:


// JavaScript
const app = new Vue({
  el: '#app',
  data: {
    baseStyles: {
      fontSize: '14px'
    },
    overridingStyles: {
      color: 'black'
    },
    isLarge: true,
    hasColor: false
  }
});





  

    This is an array conditional style binding example.

Dynamic Class and Style Bindings

Class Binding with Computed Properties

Use computed properties to dynamically bind classes:


// JavaScript
const app = new Vue({
  el: '#app',
  data: {
    isActive: true,
    hasError: false
  },
  computed: {
    classObject() {
      return {
        active: this.isActive,
        'text-danger': this.hasError
      };
    }
  }
});





  

    This is a dynamic class binding example.

Style Binding with Computed Properties

Use computed properties to dynamically bind styles:


// JavaScript
const app = new Vue({
  el: '#app',
  data: {
    isLarge: true,
    hasColor: false
  },
  computed: {
    styleObject() {
      return {
        fontSize: this.isLarge ? '20px' : '14px',
        color: this.hasColor ? 'red' : 'black'
      };
    }
  }
});





  

    This is a dynamic style binding example.

Best Practices

Follow these best practices when using conditional classes and styles in VueJS:

  • Use Descriptive Class Names: Use descriptive class names to make your templates more readable and maintainable.
  • Leverage Computed Properties: Use computed properties to dynamically calculate classes and styles based on your application's state.
  • Avoid Inline Styles for Complex Styling: Avoid using inline styles for complex styling. Use CSS classes instead for better separation of concerns.
  • Keep Styles Consistent: Keep your styles consistent across your application by using reusable class names and style objects.
  • Document Dynamic Bindings: Document your dynamic class and style bindings to make your code easier to understand and maintain.

Example Application

Here is an example application that demonstrates various conditional class and style bindings in VueJS:





  
Conditional Classes and Styles Example

  
  

    Object Syntax Class Binding
  

  
  
  
  

    Array Syntax Class Binding
  

  
  

    Object Syntax Style Binding
  

  
  
  
  

    Array Syntax Style Binding
  

  
  

    Dynamic Class Binding with Computed Property
  

  
  

    Dynamic Style Binding with Computed Property

Summary

This guide provided an overview of using conditional classes and styles in VueJS, including object and array syntax, leveraging computed properties, and following best practices. By understanding and utilizing these features, you can create dynamic and responsive user interfaces with VueJS.