[Vuex] Perform Async Updates using Vuex Actions with TypeScript

2019-04-28 15:51:50 阅读：269 来源： 互联网

标签：TypeScript checked Perform Vuex state text import todo todos

Mutations perform synchronous modifications to the state, but when it comes to make an asynchronous operation, they become useless.

Actions are a higher layer on the Vuex pattern, which allow to call mutations asynchronously or even call multiple mutations. This lesson guides you through using Vuex actions and type-safe them with TypeScript.

We want to add a todo by calling a API to get a todo from a server, then add into our todo app.

The idea is using 'Actions' to make Async request, then calling 'Mutations' with response data.

import {GetterTree, MutationTree} from 'vuex';
import {State} from '../types';
import {Todo} from '../types';

const state: State = {
    todos: [
        {text: 'Buy milk', checked: false},
        {text: 'Learning', checked: true},
        {text: 'Algorithom', checked: false},
    ],
};

export const getters: GetterTree<State, any> = {
    todos: state => state.todos.filter(t => !t.checked),
    dones: state => state.todos.filter(t => t.checked)
};

export const mutations: MutationTree<State> = {
    addTodo(state, newTodo) {
        const copy = {
            ...newTodo
        };
        state.todos.push(copy);
    }
};

export const actions: ActionTree<tate, any> = {
    addTodoAsync(context, id) {
        fetch('https://jsonplaceholder.typicode.com/posts/'+id)
            .then(data => data.json())
            .then(item => {
                const todo: Todo = {
                    checked: false,
                    text: item.title
                }

                context.commit('addTodo', todo);
            })
    }
}

export default state;

Add into root Store:

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

import todos, {getters, mutations, actions} from './todos';

Vue.use(Vuex);

export default new Vuex.Store({
  state: {
    ...todos,
  },
  getters,
  mutations,
  actions
});

Using '@Action' inside component:

<template>
<section>
    <h4>Todos</h4>
    <ul>
      <li v-for="todo in todos">{{ todo.text }}</li>
    </ul>
    <h4>Done</h4>
    <ul>
      <li v-for="todo in dones">{{ todo.text }}</li>
    </ul>
    <p>
      <label for="">
        Add todo:
        <input type="text" v-model="newTodo.text" @keyup.enter="addTodo(newTodo)">
      </label>
      <label for="">
        Add todo async:
<input type="text" v-model="id" @keyup.enter="addTodoAsync(id)">
      </label>

    </p>
</section>
</template>

<script lang="ts">
import {Component, Vue} from 'vue-property-decorator';
import {Action, State, Getter, Mutation} from 'vuex-class';
import {Todo} from '../types';

@Component({
})
export default class Todos extends Vue {
    @Getter todos: Todo[];
    @Getter dones: Todo[];

    @Mutation addTodo;
    @Action addTodoAsync;

    newTodo: Todo = {
      text: '',
      checked: false
    }

    id: string = '1';
}
</script>

标签：TypeScript,checked,Perform,Vuex,state,text,import,todo,todos
来源： https://www.cnblogs.com/Answer1215/p/10784316.html

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[Vuex] Perform Async Updates using Vuex Actions with TypeScript