When utilizing the v-for to loop through an array as shown below:
<ul id="example-1">
<li v-for="item in items">
{{ item.message }}
</li>
</ul>
The items are displayed vertically as follows:
Is there a method to insert the current item above the last item in each iteration?
Appreciate your assistance!
To reverse data, you can utilize a secondary array to store the reversed data. Use the unshift method instead of push to add each new element to the beginning of the "reversed" array:
new Vue({
el: "#app",
data() {
return {
items: ["item 1", "item 2", "item 3"],
reversedItems: []
}
},
mounted() {
this.reversedItems = this.items.reverse()
},
methods: {
loadItem(){
let i = this.items.length
this.items.unshift("item " + (i + 1))
}
}
})<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.16/vue.min.js"></script>
<div id="app">
<ul>
<li v-for="item in reversedItems">{{ item }}</li>
</ul>
<button @click="loadItem">Load item</button>
</div>To solve this issue, you can create a computed property for your items array that reverses it without mutating the original array. This ensures that the order of the array remains intact:
Here is an example of the code:
new Vue({
el: "#app",
data() {
return {
items: ["item 1", "item 2", "item 3"],
}
},
computed: {
reversedItems() {
// Create a copy of the array and then reverse it.
return this.items.slice().reverse();
},
},
methods: {
loadItem() {
const i = this.items.length;
// Add a new item to the array and let the computed property handle the re-ordering.
this.items.push("item " + (i + 1));
},
},
});<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.16/vue.min.js"></script>
<div id="app">
<ul>
<li v-for="item in reversedItems">{{ item }}</li>
</ul>
<button @click="loadItem">Load item</button>
</div>It's important to note that Vue automatically tracks changes made to arrays, like the reverse method. This means that the reversedItems property in @sovalina's solution will reactively update when any changes are made to the items array, even though it is only initialized once when the component is mounted.
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