Creating Forms in Vue.js

1. Introduction

This tutorial aims to guide you through the process of creating forms using Vue.js. Vue.js is a popular JavaScript framework used for building user interfaces. By the end of this tutorial, you will have a clear understanding of how to construct interactive forms in Vue.js, which are crucial components of many web applications.

You will learn how to:

• Create a basic Vue.js form
• Bind data to form elements
• Handle form submission
• Validate form input

Prerequisites:

• Basic knowledge of HTML, CSS, and JavaScript
• Familiarity with Vue.js or other JavaScript frameworks will be beneficial, but not mandatory

2. Step-by-Step Guide

Vue.js forms are created using a combination of standard HTML form elements and Vue.js directives. The most common directives used with forms are v-model and v-on.

• v-model: This is a two-way binding directive. It keeps the input element and the Vue.js data property in sync.
• v-on: This directive listens for DOM events. In the context of forms, it can be used to listen for the submit event.

Let's create a simple form to see these directives in action.

3. Code Examples

Example 1: Basic Form

Let's create a basic form with a text input and a submit button.

<template>
  <div>
    <form>
      <label for="name">Name:</label>
      <input type="text" id="name" v-model="name">
      <button type="submit">Submit</button>
    </form>
  </div>
</template>

<script>
export default {
  data() {
    return {
      name: ''
    }
  }
}
</script>

In the code snippet above:

• v-model="name": This creates a two-way binding between the text input and the name data property. Any changes to the input field will update the name property and vice versa.
• In the script section, we declare a name property in the data function which will hold the value of the input field.

Example 2: Handling Form Submission

Now, let's handle form submission using the v-on directive.

<template>
  <div>
    <form v-on:submit.prevent="submitForm">
      <label for="name">Name:</label>
      <input type="text" id="name" v-model="name">
      <button type="submit">Submit</button>
    </form>
  </div>
</template>

<script>
export default {
  data() {
    return {
      name: ''
    }
  },
  methods: {
    submitForm() {
      alert(`Form submitted with name ${this.name}`);
    }
  }
}
</script>

In this example:

• v-on:submit.prevent="submitForm": This listens for the submit event and calls the submitForm method. The .prevent modifier prevents the default form submission behavior which causes the page to refresh.
• The submitForm method shows an alert with the submitted name.

4. Summary

In this tutorial, you've learned how to create a form in Vue.js, bind data to form elements using v-model, and handle form submission with v-on. Next, you could learn about form validation and how to handle different types of form inputs like checkboxes and radio buttons.

Here are some additional resources:
- Vue.js Guide on Form Input Bindings
- Vue.js API on v-model

5. Practice Exercises

Exercise 1:

Create a form with two fields, "First Name" and "Last Name". Display the full name elsewhere on the page as the inputs change.

Exercise 2:

Add a "Submit" button to the form you created in exercise 1. When the form is submitted, prevent the page from refreshing and instead, display an alert with the full name.

Exercise 3:

Enhance the form from exercise 2 to include an email field. On form submission, validate that the email field is not empty and contains an '@' symbol. If the validation fails, display an appropriate error message.

Solutions will vary, but the key here is to practice using v-model for two-way data binding and v-on for event handling. Keep experimenting and happy coding!