How to Dynamically Load External JS Scripts in VueJS Components for Enhanced Performance?

How to Dynamically Load External JS Scripts in VueJS Components

Enhancing component functionality often requires external scripts. However, loading all scripts simultaneously can hinder performance. If you want to load scripts only when necessary, consider implementing dynamic script loading.

Solution

The following steps outline a simple yet effective solution for dynamically loading external scripts in VueJS components:

1. Create a script element. Create a new script element and assign the external script's URL to the src attribute. For instance, to load the Google Recaptcha script:

<code class="html">let recaptchaScript = document.createElement('script')
recaptchaScript.setAttribute('src', 'https://www.google.com/recaptcha/api.js')</code>

2. Append the script to the head. Once the script element is created, append it to the head of the document using document.head.appendChild(recaptchaScript).
3. Implement in the component's mounted() hook. Place the code for creating and appending the script element in the mounted() lifecycle hook of the component where it is required. This ensures that the script loads only when the component is mounted.

Example

Here's an example of how to use this technique in a VueJS component:

<code class="html"><template>
   .... your HTML
</template>

<script>
  export default {
    data: () => ({
      ......data of your component
    }),
    mounted() {
      let recaptchaScript = document.createElement('script')
      recaptchaScript.setAttribute('src', 'https://www.google.com/recaptcha/api.js')
      document.head.appendChild(recaptchaScript)
    },
    methods: {
      ......methods of your component
    }
  }
</script></code>

By following these steps, you can dynamically load external JS scripts in VueJS components, ensuring that scripts are loaded only when necessary, thereby improving performance.

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