A guide on implementing lazy loading for components and templates

I have successfully implemented lazy loading for components and templates individually, but I am struggling to combine the two.

Here's an example of how I lazy load a component:

// In my main.js file
const router = new VueRouter({
    routes: [
        { path: '/lazy', component: () => import('./lazy.js') }
    ]
})

// Inside lazy.js
export default {
    template: '<div>Lazy loaded component</div>'
}

This method works well as the lazy.js component is only downloaded when navigating to /lazy.

And here's how I lazy load a template:

// All in my main.js file
const lazyTemplate = Vue.component('lazyComponent', function(resolve) {
    fetch('./lazy.html')
        .then(response => response.text())
        .then(function(data) {
            resolve({
                template: data
            });
        });
});

const router = new VueRouter({
    routes: [
        { path: '/lazy', component: lazyTemplate }
    ]
});

Similarly, this method works effectively by downloading the lazy.html template only when navigating to /lazy.

However, my challenge lies in integrating these two approaches. I'm trying to find a way to lazily load a component that in turn lazily loads a template without relying on tools like webpack. How can I achieve this seamlessly?

Answer №1

Utilize lazy loading and asynchronous methods to load both the template and component separately, then combine them before resolving the Promise:

const lazyComponent = Vue.component('lazyComponent', function(resolve) {
  Promise.all([
    // retrieve HTML template asynchronously
    fetch('./lazy.html').then(response => response.text()),
    // import component JavaScript asynchronously
    import('./lazy.js')
  ]).then(([template, module] => {
    // merge template with component once both are loaded
    let component = module.default;
    component.template = template;
    // return component with merged template
    resolve(component);
  }));
});

const router = new VueRouter({
    routes: [
        { path: '/lazy', component: lazyComponent }
    ]
});

Answer №2

If you're looking to optimize your Vue.js application, consider implementing the pattern outlined in What About Separation of Concerns

<!-- my-component.vue -->
<template>
  <div>This content will be pre-compiled</div>
</template>
<script src="./my-component.js"></script>
<style src="./my-component.css"></style>

This approach is a subtle modification of your current method, but it allows for the template to not require compilation in the browser, leading to a smaller app size by excluding the Vue compiler.

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