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The v-model Vue directive allows us to create a two-way binding.
You can bind a form input element for example, and make it change the Vue data property when the user changes the content of the field:
<input v-model="message" placeholder="Enter a message">
<p>Message is: {{ message }}</p>
<select v-model="selected">
<option disabled value="">Choose a fruit</option>
<option>Apple</option>
<option>Banana</option>
<option>Strawberry</option>
</select>
<span>Fruit chosen: {{ selected }}</span>
Handy directive modifiers
To make the model update when the change event occurs, and not any time the user presses a key, you can use v-model.lazy instead of just v.model.
Working with input fields, v-model.trim is useful because it automatically removes whitespace.
And if you accept a number instead than a string, make sure you use v-model.number.
Nested properties
Say you have a shopping cart, and you have a component that holds a form to add a product:
<template>
<div class="">
<h1>Add Product</h1>
<label>Name</label>: <input>
<label>Description</label>: <textarea></textarea>
<button @click="addProduct">Add</button>
</div>
</template>
<script>
export default {
name: 'AddProduct',
data() {
return {
product: {
name: '',
description: ''
}
}
},
methods: {
addProduct() {
console.log(this.product)
}
}
}
</script>
To make the form update the inner properties of the product state value, you use product.*:
<label>Name</label>: <input v-model="product.name">
<label>Description</label>: <textarea v-model="product.description"></textarea>