How to use the v-memo for optimization In Vue
The v-memo directive provides more granular control over re-rendering. It allows you to define an array of dependencies. The element or component wrapped with v-memo will only re-render if one or more of the values in the dependency array change.
Example: The below code implements the v-memo directive to optimize the Vue rendering.
<template>
<div style="text-align: center">
<h2>
The text below input field will be
replaced with the entered <br />text
as it is rendered using v-memo directive.
</h2>
<input type="text" v-model="reply" />
<h3 v-memo=[reply]>{{ reply }}</h3>
</div>
</template>
<script>
import { ref } from 'vue';
export default {
setup() {
const reply = ref("Reply");
return {
reply
};
}
};
</script>
Output:
Key Features of v-memo:
- Re-renders only when one or more values in the specified dependency array change.
- Well-suited for scenarios where updates are needed conditionally based on specific data changes.
Vue Render Optimization with v-once and v-memo
Rendering speed is crucial for a good user experience in modern apps. Out of all ways, one extremely easy way to optimize rendering is by only re-rendering what needs to be. While Vue re-renders components when their data changes this can lead to inefficiencies. v-once and v-memo directives offer a solution by allowing control over re-rendering, improving performance.
Table of Content
- How v-once and v-memo Optimize the Vue Render?
- Using the v-once for optimization
- Using the v-memo for optimization
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