Vue.js Template Syntax

Vue.js Template Syntax defines how to write templates that Vue.js will compile into virtual DOM render functions.
It provides a declarative and reactive way to describe the HTML structure and behavior of Vue.js components.
Vue.js templates are written using an HTML-based syntax with additional features for data binding, directives, and expressions.

1. Overview

Vue.js Template Syntax allows you to create dynamic and interactive user interfaces:

Data Binding: Bind data from the Vue instance to the DOM using expressions and directives.
Conditional Rendering: Use directives like v-if and v-show to conditionally render elements.
List Rendering: Use the v-for directive to render lists of items based on an array or object.
Event Handling: Attach event listeners to DOM elements using the v-on directive.
Interpolation: Use double curly braces {{ }} for text interpolation to display data dynamically.
Computed Properties: Define computed properties in the template to perform data transformations.

2. Template Syntax

Vue.js templates use an HTML-based syntax with additional Vue-specific features:

<!-- Vue.js Template Syntax -->
<div id="app">
  <p>{{ message }}</p>
  <button v-on:click="increment">Increment</button>
</div>

In this example, {{ message }} is a template expression that will be replaced with the value of the message data property from the Vue instance. The v-on:click directive attaches an event listener to the button element.

3. Directives

Vue.js templates use directives to apply special behavior to HTML elements:

v-bind: Binds an attribute or property to an expression.
v-if, v-else-if, v-else: Conditional rendering based on the truthiness of an expression.
v-for: Renders a list of items based on an array or object.
v-on: Listens to DOM events and triggers Vue methods or expressions.
v-model: Creates two-way data bindings on form inputs.
v-show: Conditional rendering based on the truthiness of an expression (similar to v-if, but using CSS display property).

4. Computed Properties

Vue.js templates can also use computed properties to perform data transformations:

// Vue.js Component Definition
new Vue({
  el: '#app',
  data: {
    message: 'Hello Vue.js!'
  },
  computed: {
    reversedMessage: function() {
      return this.message.split('').reverse().join('');
    }
  }
});

In this example, {{ reversedMessage }} is a computed property in the template that reverses the message data property.

5. Conclusion

Vue.js Template Syntax provides a powerful and intuitive way to create dynamic and interactive user interfaces. By combining HTML-based templates with Vue-specific features like directives and computed properties, you can build robust Vue.js applications with ease.