What is the most efficient way to dynamically load a script file before proceeding with the rest of the code execution?

Question

What is the most efficient way to dynamically load a script file before proceeding with the rest of the code execution?

In my Angular home.component.ts file, I have added the script loading code as shown below:

export class HomeComponent {
   constructor() {
       this.loadDynamicScript();
   } 

   public loadDynamicScript() {
      var script = document.createElement('script');
      script.src = "../node_modules/xxxxxx/i18n/xx.min.js";
      script.async = false;
      document.head.appendChild(script);
   }

The issue I am facing is that the file is being loaded after the components are created, rendering it useless. How can I ensure that the file is loaded immediately after being appended to the document?

angular typescript sleep script-tag

Answer 1

Answer №1

If you want to connect calls together, returning a promise is one way to achieve that

export class HomeComponent {
    constructor() {
        this.loadDynmicallyScript()
        .then(() => {
          this.doSomethingWhenScriptIsLoaded();
        });
    } 
     public loadDynmicallyScript():Promise {
        var script = document.createElement('script');
        script.src = "../node_modules/xxxxxx/i18n/xx.min.js";
        script.async =false;
        document.head.appendChild(script);
        return Promise((resolve, reject) => {
          script.onload = resolve;
        });    
     }

Alternatively, you can simply provide a function to the onLoad event handler for when the script finishes loading

export class HomeComponent {
    constructor() {
        this.loadDynmicallyScript()
    } 
     public loadDynmicallyScript():Promise {
        var script = document.createElement('script');
        script.src = "../node_modules/xxxxxx/i18n/xx.min.js";
        script.async =false;
        document.head.appendChild(script);
        script.onload = () => this.doSomethingWhenScriptIsLoaded();
     }

Answer 2

If you want to connect calls together, returning a promise is one way to achieve that

export class HomeComponent {
    constructor() {
        this.loadDynmicallyScript()
        .then(() => {
          this.doSomethingWhenScriptIsLoaded();
        });
    } 
     public loadDynmicallyScript():Promise {
        var script = document.createElement('script');
        script.src = "../node_modules/xxxxxx/i18n/xx.min.js";
        script.async =false;
        document.head.appendChild(script);
        return Promise((resolve, reject) => {
          script.onload = resolve;
        });    
     }

Alternatively, you can simply provide a function to the onLoad event handler for when the script finishes loading

export class HomeComponent {
    constructor() {
        this.loadDynmicallyScript()
    } 
     public loadDynmicallyScript():Promise {
        var script = document.createElement('script');
        script.src = "../node_modules/xxxxxx/i18n/xx.min.js";
        script.async =false;
        document.head.appendChild(script);
        script.onload = () => this.doSomethingWhenScriptIsLoaded();
     }

What is the most efficient way to dynamically load a script file before proceeding with the rest of the code execution?

Answer №1

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