What is the situation when Vue does not allow the page to return?

Vue is a popular JavaScript framework that is very powerful in building user interfaces. Although Vue provides many useful features, sometimes you may face a tricky problem: Vue doesn't let the page go back. This article will explore this problem and how to solve it.

Why does Vue prevent the page from returning?

First, let us understand why Vue prevents the page from returning. This is usually due to the way Vue Router is implemented. Vue Router is the official routing manager for Vue.js. It makes using routing in single page applications (SPA) very simple.

Vue Router manages routing based on HTML5’s history API. This API provides many useful features, such as displaying URLs in the address bar, and you can use URLs like "/products/123" to navigate to different pages. However, the history API also has a disadvantage, that is, it is asynchronous. This means that when the user presses the browser's back button, Vue Router needs to asynchronously load the previous page's components before it can render it.

This causes a problem: if you are waiting for a component to finish loading, and the user presses the browser's back button during this time, Vue will prevent the page from returning.

how to solve this problem?

The developers of Vue provide two methods to solve this problem. Let's explain them one by one.

1. Using Vue’s keep-alive component

Vue provides a component called keep-alive. Its purpose is to cache state between components or avoid re-rendering. The keep-alive component allows you to retain loaded component instances when switching components instead of destroying them. This can improve application performance while also resolving page return issues.

To use the keep-alive component, you need to include it in the router:

<router-view v-slot="{ Component }">
  <keep-alive>
    <component :is="Component"/>
  </keep-alive>
</router-view>

Add this code to your Vue App so that when the user presses the back button, the Loaded component instances are retained and will not be destroyed. Also, when the user returns to the component, the saved component instance is displayed instead of reloading it. This solves the problem of Vue not letting the page return.

2. Use the fallback option of Vue Router

If using the keep-alive component cannot solve the problem, you can also use the fallback option of Vue Router. The fallback option allows you to render a fallback route when a routing error is triggered. By specifying this fallback route, you can build a UI that handles error conditions. In this alternate route, you can display an error message telling the user why they can't return. This way you ensure that users don't inadvertently return to unexpected places.

To use the fallback option, you need to specify it in the router's configuration:

const router = new VueRouter({
  mode: 'history',
  routes: [
    // normal routes...
    {
      path: '/error',
      component: ErrorPage
    },
    // fallback route
    { path: '*', component: ErrorPage }
  ]
});

In this example, we define a component named ErrorPage and specify it in the router's configuration A backup route. This backup route will be used in case all other paths fail to match.

Conclusion

Vue is a very powerful framework, but it can sometimes lead to some difficulties. If you have issues with Vue not letting the page return, exploring the keep-alive component and the fallback option are your two best options. No matter which method you use, you can guarantee that the user experience is maintained while solving this problem.

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