How to implement route caching through Vue’s keep-alive component

How to implement route caching through vue's keep-alive component

When using Vue for front-end development, we often encounter a need, that is, we hope to retain the status of the previous route when switching routes. To achieve a better user experience. Vue provides a component called keep-alive that can help us achieve this requirement.

keep-alive is an abstract component built into Vue, which can be wrapped outside the component that needs to be cached to achieve the caching effect of the component. When using keep-alive in routing, you can wrap it outside the 975b587bf85a482ea10b0a28848e78a4 component. Next, let us use a practical example to demonstrate how to use keep-alive to implement route caching.

First, we need to create a Vue project and install the vue-router plug-in. Execute the following command in the command line:

vue create router-cache-demo
cd router-cache-demo
npm install vue-router

Next, we create a component called Home as shown below:

<template>
  <div>
    <h1>Home</h1>
    <p>{{ count }}</p>
    <button @click="increment">Increment</button>
  </div>
</template>

<script>
export default {
  data() {
    return {
      count: 0
    };
  },
  methods: {
    increment() {
      this.count++;
    }
  }
};
</script>

This component displays a counter and a button when the button is clicked , the counter value will be increased by 1.

Then, in the routing configuration file, we need to introduce the Home component and set the routing path.

import Vue from 'vue';
import VueRouter from 'vue-router';
import Home from './components/Home.vue';

Vue.use(VueRouter);

const routes = [
  { path: '/', component: Home },
];

const router = new VueRouter({
  routes
});

export default router;

In the App.vue file, we wrap the 975b587bf85a482ea10b0a28848e78a4 component in the 7c9485ff8c3cba5ae9343ed63c2dc3f7 component and set the include attribute so that the Home component can be cached.

<template>
  <div id="app">
    <keep-alive :include="cachedComponents">
      <router-view />
    </keep-alive>
  </div>
</template>

<script>
export default {
  data() {
    return {
      cachedComponents: ['Home']
    };
  }
};
</script>

Here, we set the cachedComponents array and add the Home component to the array to tell Vue to cache the component when switching routes.

Finally, we introduce the routing configuration file in the main.js file and associate it with the Vue instance.

import Vue from 'vue';
import App from './App.vue';
import router from './router';

new Vue({
  router,
  render: h => h(App)
}).$mount('#app');

Now, we can try to switch routes, and we can find that when switching to other routes and then switching back to the Home route, the previous counter value is still retained.

Through the above steps, we successfully used Vue’s keep-alive component to achieve the routing caching effect. We can freely set the routing components that need to be cached according to actual needs.

Summary: Through Vue’s keep-alive component, we can cache routing components to improve user experience. When using keep-alive, we need to wrap the routing component and set the include attribute in the App.vue file to tell Vue which components to cache. Hope this article is helpful to you!

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