Vue Js Run Procedural Code On Change

Vue.js is a progressive JavaScript framework that is used for building user interfaces (UIs). It allows you to build complex web applications in a declarative way, using a component-based architecture. One of the main features of Vue.js is reactivity. This means that when data changes, the UI updates automatically without having to refresh the page.

Handling Changes in Vue.js

When working with Vue.js, you’ll often need to handle changes to your data. You can do this using the v-on directive, which allows you to listen for specific events and trigger methods in response. For example, if you have a form input that you want to listen for changes on, you can use the v-on:change directive:

<input v-on:change="handleChange">

When the input changes, the handleChange method will be called.

Running Procedural Code On Change

Sometimes you’ll need to run procedural code in response to changes in your data. One way to do this is by creating a computed property. Computed properties are functions that are dependent on reactive data and only update when necessary. They’re a great way to run procedural code based on changes to your data.

Here’s an example:

<div id="app">
  <input v-model="firstName">
  <input v-model="lastName">
  <p>Full Name: {{ fullName }}</p>
</div>

<script>
  var app = new Vue({
    el: '#app',
    data: {
      firstName: '',
      lastName: ''
    },
    computed: {
      fullName: function() {
        // Procedural code goes here
        return this.firstName + ' ' + this.lastName;
      }
    }
  });
</script>

In this example, we have two input fields for the user’s first name and last name. We also have a computed property called fullName, which concatenates the first and last name together. We can run any procedural code we want within the fullName function, and it will be executed every time the user changes their first or last name.

Conclusion

In conclusion, Vue.js allows you to handle changes in your data using the v-on directive, and run procedural code based on those changes using computed properties.

FAQ

1. How does Vue.js handle changes to data?

Vue.js uses reactivity to update the UI automatically when data changes.

2. What is a computed property in Vue.js?

A computed property is a function that is dependent on reactive data and only updates when necessary.

3. How can I run procedural code in response to changes in Vue.js?

You can use a computed property to run procedural code based on changes to your data.

4. Does Vue.js support two-way data binding?

Yes, Vue.js supports two-way data binding using the v-model directive.

5. Can Vue.js be used with other JavaScript frameworks?

Yes, Vue.js can be used with other JavaScript frameworks and libraries, such as React and Angular.