implement dynamic import on event handler

Implementing Dynamic Import on Event Handler

Dynamic import is a feature in modern JavaScript that allows importing modules on demand. It helps to reduce the initial loading time of the web page and improves the overall performance of the application. In this article, we will explore how to implement dynamic import on an event handler.

Step 1: Create a Button

Let's start by creating a button with an event listener that will trigger the dynamic import. Here's the code:

<button id="myButton">Load Module</button>

<script>
  const button = document.getElementById('myButton');
  button.addEventListener('click', () => {
    // dynamic import code goes here
  });
</script>

Step 2: Implement Dynamic Import

Now that we have our button set up, let's implement the dynamic import. We will use the import() function to load the module on demand. Here's the updated code:

<button id="myButton">Load Module</button>

<script>
  const button = document.getElementById('myButton');
  button.addEventListener('click', () => {
    import('./myModule.js')
      .then(module => {
        // use the module here
      })
      .catch(error => {
        console.error('Error:', error);
      });
  });
</script>

The above code will dynamically load the myModule.js file when the button is clicked. The then() method will be called once the module is loaded, and we can use the module in our application. If there is an error while loading the module, the catch() method will handle the error.

Step 3: Use the Module

Now that we have successfully loaded the module, we can use it in our application. Here's an example:

<button id="myButton">Load Module</button>

<script>
  const button = document.getElementById('myButton');
  button.addEventListener('click', () => {
    import('./myModule.js')
      .then(module => {
        const result = module.myFunction();
        console.log(result);
      })
      .catch(error => {
        console.error('Error:', error);
      });
  });
</script>

In the above code, we are calling a function called myFunction() from the myModule.js file and logging the result to the console.

Conclusion

Dynamic import is a powerful feature in modern JavaScript that allows importing modules on demand. It can help to improve the performance of your application by reducing the initial loading time. In this article, we explored how to implement dynamic import on an event handler using the import() function. We also learned how to handle errors while loading the module and how to use the module in our application.