Vue.js v-once Directive

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The v-once directive is a Vue.js directive that is used to avoid unwanted re-renders of an element. It treats the element as a static content after rendering it once for the first time. This improves performance as it does not have to be rendered again. First, we will create a div element with the id of choice. The v-once directive is then applied to this element to make it render only once.

Syntax:

v-once

Parameters: This function does not accept any parameter.

Example: This example uses Vue.js to show the working of the data with v-once.

<!DOCTYPE html> 
<html> 
  
<head> 
    <title> 
        VueJS v-once Directive 
    </title> 
  
    <!-- Load Vuejs -->
    <script src= 
"https://cdn.jsdelivr.net/npm/vue/dist/vue.js"> 
    </script> 
</head> 
  
<body> 
    <div style="text-align: center; 
              width: 600px;"> 
        <h1 style="color: green;"> 
            zambiatek 
        </h1> 
  
        <b> 
            VueJS | v-once directive 
        </b> 
    </div> 
  
    <div id="canvas" style= 
        "border: 1px solid #000000; 
        width: 600px; height: 200px;"> 
        <div id="app" style="text-align: center; 
                padding-top: 40px;"> 
            <h1 v-once>{{ data }}</h1> 
        </div> 
    </div> 
    <script> 
        var app = new Vue({ 
            el: '#app', 
            data: { 
                data: 'zambiatek' 
            } 
        }) 
    </script> 
</body> 
  
</html> 

Output:

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