Vue Js Push to Array with Key: In Vue.js, when using the v-for directive to render an array of objects, it’s important to set a unique key for each item. The key is used by Vue.js to keep track of each item’s identity and state, which is important for efficient updates to the DOM. When pushing a new item to the array, it’s also necessary to ensure that it has a unique key. This can be achieved by setting a unique identifier for the new item’s key property. By doing this, Vue.js will be able to update the DOM more efficiently, resulting in a faster and more responsive application.
How can a unique key be set for a new item when using the push() method to add it to the array?
This Vue.js code creates an “addItem” method that is called when a form is submitted. Inside the method, a new object is created with a unique ID and the value of an input field. The object is then pushed to an array of items using the push() method. Finally, the input field is cleared. This method is an example of how to add an item to an array in Vue.js by creating a new object with unique properties and using the push() method to add it to the existing array.
Vue Js Push to Array with Key Example
<div id="app">
<table>
<tbody>
<tr v-for="(item, index) in items" :key="item.id">
<td>{{ item.id }}</td>
<td>{{ item.name }}</td>
</tr>
</tbody>
</table>
<form @submit.prevent="addItem">
<label for="itemName">Item Name:</label>
<input type="text" id="itemName" v-model="newItemName" required>
<button type="submit">Add Item</button>
</form>
</div>
<script>
new Vue({
el: '#app',
data() {
return {
items: [
{ id: 1, name: "Item 1" },
{ id: 2, name: "Item 2" },
{ id: 3, name: "Item 3" },
],
newItemName: "",
};
},
methods: {
addItem() {
// Create a new item object with a unique ID
const newItem = {
id: Date.now(),
name: this.newItemName,
};
// Push the new item object into the items array
this.items.push(newItem);
// Clear the input field
this.newItemName = "";
},
},
});
</script>
Output of Vue Js Push to Array with Key
