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Vue.js Concepts

Learn more about Vue.js concepts with coding samples for each one.

Let's dive deeper into these key Vue.js concepts with coding samples for each one.

✅ Templates​

Templates in Vue.js are used to define the structure of your application's HTML. They provide a way to declaratively render the DOM based on the application's state. Vue.js templates use a special syntax that allows you to bind data and apply directives.

Coding Sample:

<div id="app">
  <p>{{ message }}</p>
</div>

In this example, {{ message }} is a template expression that binds the value of the message property to the paragraph element.

✅ Data​

Data in Vue.js represents the application's state. You can define data properties in your Vue instance, and they are reactive, meaning changes to the data automatically update the DOM.

Coding Sample:

var app = new Vue({
  el: '#app',
  data: {
    message: 'Hello, Vue.js!'
  }
});

Here, message is a data property.

✅ Directives​

Directives are special markers in the DOM that tell Vue.js to do something to a DOM element or a group of elements. They are prefixed with v-. Vue provides a set of built-in directives for common tasks.

Coding Sample:

<div id="app">
  <p v-if="showMessage">{{ message }}</p>
  <button v-on:click="toggleMessage">Toggle Message</button>
</div>

In this example, v-if is a directive that conditionally renders the <p> element based on the showMessage data property. v-on:click is a directive that listens for a click event and calls the toggleMessage method when clicked.

✅ Methods​

Methods in Vue.js are functions defined in the Vue instance that you can call in response to user interactions or to perform other logic. You can use methods to modify data properties.

Coding Sample:

var app = new Vue({
  el: '#app',
  data: {
    message: 'Hello, Vue.js!',
    showMessage: true
  },
  methods: {
    toggleMessage: function () {
      this.showMessage = !this.showMessage;
    }
  }
});

In this example, toggleMessage is a method that toggles the value of the showMessage data property when called.

✅ Computed Properties​

Computed properties in Vue.js are functions that are cached based on their dependencies. They are useful for performing calculations based on reactive data properties without the need to recompute them every time.

Coding Sample:

var app = new Vue({
  el: '#app',
  data: {
    message: 'Hello, Vue.js!',
    length: 0
  },
  computed: {
    messageLength: function () {
      return this.message.length;
    }
  }
});

In this example, messageLength is a computed property that calculates the length of the message data property.

✅ VueJS Components​

Components in Vue.js allow you to create reusable and encapsulated building blocks for your application's user interface. Each component can have its own template, data, methods, and more.

Coding Sample:

// Define a component
Vue.component('my-component', {
  template: '<p>{{ message }}</p>',
  data: function () {
    return {
      message: 'This is a component!'
    }
  }
});

// Create a Vue instance with the component
var app = new Vue({
  el: '#app',
});

In this example, we define a component called 'my-component' with its template and data. Then, we use it within the #app element. The component's template will be rendered where it's placed.

✅ Summary​

These concepts are the building blocks of Vue.js applications. As you become more familiar with them, you'll be able to create more complex and interactive Vue.js applications.

Don't hesitate to practice and experiment to deepen your understanding of Vue.js.

✅ Resources​