Vue project saves without reloading

Vue.js is a popular front-end framework that helps developers build interactive web applications more efficiently. When developing projects using Vue.js, we often encounter situations where we need to save state but do not want to reload it. This article will introduce some solutions to achieve this goal.

1. Use browser local storage

Browser local storage refers to storing data in the client's local browser so that the data can be retained when the page is refreshed or reloaded. HTML5 provides two functions: localStorage and sessionStorage. They can store data in the local browser and have the following characteristics:

1. localStorage The stored data has no expiration time unless the client manually clears it.
2. sessionStorage The stored data is cleared at the end of the session, that is, when the browser window or tab is closed, the stored data is also cleared.

Use the localStorage method, in the Vue.js project:

1. Get data:

var data = localStorage.getItem('key');

2. Storage data:

localStorage.setItem('key', data);

3. Delete data:

localStorage.removeItem('key');

2. Use Vuex

Vuex is a state management pattern for Vue.js applications. It centrally manages the state of all components of an application and provides tools and rules to ensure that state updates are consistent and predictable. Using Vuex you can store data in global state so it can be accessed and updated throughout your application. To achieve this goal in a Vue.js project, you can use the following steps:

1. Create a store.js file:

import Vue from 'vue';
import Vuex from 'vuex';

Vue.use(Vuex);

export default new Vuex.Store({
  state: {
    data: null
  },
  
  mutations: {
    setData (state, payload) {
      state.data = payload;
    }
  },
  
  actions: {
    setData ({commit}, payload) {
      commit('setData', payload);
    }
  });

2. In the component that needs to save the state Trigger setData() method in:

this.$store.dispatch('setData', data);

3. In components that need to access the saved state, use the computed method to get the stored data:

computed: {
  userData () {
    return this.$store.state.data;
  }
}

三, using cookies

Cookie is another commonly used way to save state on the client side. Cookies are typically used to store a user's authentication credentials and other preferences. In the Vue.js project, using cookies to store data can be achieved through the following steps:

1. Using the js-cookie library in the Vue.js project:

npm install js-cookie --save

2. Set a cookie in the component that needs to save the state:

import Cookies from 'js-cookie';

Cookies.set('data', data);

3. The state can be accessed from any other component:

import Cookies from 'js-cookie';

var data = Cookies.get('data');

4. Use IndexedDB

IndexedDB is a native database provided by the browser and can store structured data in the browser. In the Vue.js project, using IndexedDB can be achieved through the following steps:

1. Create an IndexedDB database named myDatabase:

var request = window.indexedDB.open('myDatabase', 1);

request.onerror = function (event) {
  console.log("数据库打开失败");
};

request.onsuccess = function (event) {
  console.log("数据库打开成功!");
};

2. When the state needs to be saved In the component, store the data to the database:

var request = window.indexedDB.open('myDatabase', 1);

request.onerror = function(event) {
  console.log("数据库打开失败");
};

request.onsuccess = function(event) {
  var db = request.result;
  var transaction = db.transaction(['data'], 'readwrite');
      
  var objectStore = transaction.objectStore('data');
  var request = objectStore.put(data, 'key');
      
  request.onerror = function(event) {
    console.log("数据写入失败");
  };
      
  request.onsuccess = function(event) {
    console.log("数据写入成功");
  };
};

3. In the component that needs to access the saved state, get the saved data from the database:

var request = window.indexedDB.open('myDatabase', 1);

request.onerror = function(event) {
  console.log("数据库打开失败");
  };

request.onsuccess = function(event) {
  var db = request.result;
  var transaction = db.transaction(['data'], 'readonly');
      
  var objectStore = transaction.objectStore('data');
  var request = objectStore.get('key');
      
  request.onerror = function(event) {
    console.log("数据读取失败");
  };
      
  request.onsuccess = function(event) {
    console.log(request.result);
  };
}

Summary:

The above are some methods to solve the problem of saving state without reloading. Developers can choose the appropriate method to realize the needs of the project. Whether using browser local storage, Vuex, cookies, or IndexedDB, all are good solutions. However, it is important to note that in some cases these methods may not be suitable for a specific application environment. Therefore it is best to evaluate different methods and choose the most suitable method to save the state without reloading.

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