如何更新 Vuex 中的状态数组?

How to update a state array in Vuex?

我需要能够添加、删除和编辑条目。到目前为止,我只能添加和删除。

我的问题是:添加使用PUSH,删除使用SPLICE。但是编辑呢?

我正在使用 VUEJS、VUEX 和 JavaScript。

我正在做的事的例子:

<b-button type="submit" @click.prevent="submit()">SAVE</b-button>

methods: {      
  submit() {
    this.$v.edit_category.$touch();
    if(this.$v.edit_category.$error) return
    this.editCategory()
  },
  editCategory() {
    const category = {
      value: this.edit_category.value,
      text: this.edit_category.text,
      category_active: this.edit_category.category_active,
    }        
    
    this.$store.commit('saveCategory', category)
  },
},

store.js:

actions: {
addCategory({ commit }, payload) {
  console.log(payload)
  commit('addCategory', payload) 
},
saveCategory({ commit }, payload) {
  console.log(payload)
  commit('saveCategory', payload) 
},
 deleteCategory({ commit }, payload) {
  console.log(payload)
  commit('deleteCategory', payload) 
}


mutations: {
addCategory(state, category) {   
  state.categories.push(category)      
},
saveCategory(state, payload) {
  state.categories.push(payload)
},
deleteCategory(state, category) {
  var index = state.categories.findIndex(c => c.value === category.value)
  state.categories.splice(index, 1)
},

使用Vue.set:

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

editCategory(state, category) {
  var index = state.categories.findIndex(c => c.value === category.value);
  Vue.set(state.categories, index, category);  // ✅ Vue.set
},

这是必需的,因为阅读 docs 我们看到:

Vue cannot detect the following changes to an array:

When you directly set an item with the index, e.g. vm.items[indexOfItem] = newValue