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Vue Tutorial

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Vue Forms

Vue gives us an easy way to improve the user experience with forms by adding extra functionality like responsiveness and form validation.

Vue uses the v-model directive when handling forms.

Our First Form with Vue

Lets start with a simple shopping list example to see how Vue can be used when creating a form.

For more information about forms in HTML, with related tags and attributes, see our HTML Forms tutorial.


1. Add standard HTML form elements:

<form>
  <p>Add item</p>
  <p>Item name: <input type="text" required></p>
  <p>How many: <input type="number"></p>
  <button type="submit">Add item</button>
</form>

2. Create the Vue instance with the current item name, number and the shopping list, and use v-model to connect our inputs to it.

<div id="app">
  <form>
    <p>Add item</p>
    <p>Item name: <input type="text" required v-model="itemName"></p>
    <p>How many: <input type="number" v-model="itemNumber"></p>
    <button type="submit">Add item</button>
  </form>
</div>

<script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>
<script>
  const app = Vue.createApp({
    data() {
      return {
        itemName: null,
        itemNumber: null,
        shoppingList: [
          { name: 'Tomatoes', number: 5 }
        ]
      }
    }
  })
  app.mount('#app')
</script>

3. Call the method to add an item to the shopping list, and prevent the default browser refresh on submit.

<form v-on:submit.prevent="addItem">

4. Create the method that adds the item to the shopping list, and clears the form:

methods: {
  addItem() {
    let item = {
      name: this.itemName,
      number: this.itemNumber
      }
    this.shoppingList.push(item);
    this.itemName = null
    this.itemNumber = null
  }
}

5. Use v-for to show an automatically updated shopping list below the form:

<p>Shopping list:</p>
<ul>
  <li v-for="item in shoppingList">{{item.name}}, {{item.number}}</li>
</ul>

Below is the final code for our first Vue form.

Example

In this example we can add new items to a shopping list.

<div id="app">
  <form v-on:submit.prevent="addItem">
    <p>Add item</p>
    <p>Item name: <input type="text" required v-model="itemName"></p>
    <p>How many: <input type="number" v-model="itemNumber"></p>
    <button type="submit">Add item</button>
  </form>

  <p>Shopping list:</p>
  <ul>
    <li v-for="item in shoppingList">{{item.name}}, {{item.number}}</li>
  </ul>
</div>

<script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>
<script>
  const app = Vue.createApp({
    data() {
      return {
        itemName: null,
        itemNumber: null,
        shoppingList: [
          { name: 'Tomatoes', number: 5 }
        ]
      }
    },
    methods: {
      addItem() {
        let item = {
          name: this.itemName,
          number: this.itemNumber
        }
        this.shoppingList.push(item)
        this.itemName = null
        this.itemNumber = null
      }
    }
  })
  app.mount('#app')
</script>
Try it Yourself ยป

Notice the two-way binding v-model provides in the example above:

  • v-model updates the Vue instance data when the HTML input change
  • v-model also updates the HTML input when the Vue instance data changes

To learn more about v-model and see more form examples, click 'Next'.



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