问题描述
我定义了以下 store
:
state: () => ({
infoPackCreationData: null,infoPackCreationTab: null,}),getters: {
infoPackImage(state: any) {
return state.infoPackCreationTab && state.infoPackCreationTab.infopackContents
? state.infoPackCreationTab.infopackContents.filter((item: any) => item.type === "IMAGE")
: [];
}
},mutations: {
setimageData(state:any,infopackImageData: any) {
state.infoPackCreationTab.infopackContents.filter((item: any) => {if(item.type === "IMAGE")
item = infopackImageData
console.log(item,'this is items');
return item})
}
},actions: {
setimageData(context: any,payload: any) {
context.commit('setimageData',payload)
}
}
在我的组件中,我使用 computed
来获取 imageList
:
computed: {
...mapGetters("creationStore",["infoPackImage"]),imageList: {
get() {
return this.infoPackImage ?? [];
},set(value) {
this.$store.dispatch('creationStore/setimageData',value);
}
}
},
问题是我想使用可拖动的库编辑 imageList
的 index
值,
但 imageList 并没有反应性,它只是移动图像而不显示前一个索引中的另一个图像:
async imageChange(e) {
this.loading = true
let newIndex = e.moved.newIndex;
let prevOrder = this.imageList[newIndex - 1]?.order ?? 0
let nextOrder = this.imageList[newIndex + 1]?.order ?? 0
const changeImageOrder = new InfopackImageService();
try {
return await changeImageOrder.putimageApi(this.$route.params.infopackId,this.$route.params.tabId,e.moved.element.id,{
title: e.moved.element.title,infopackAssetRef: e.moved.element.infopackAssetRef,order: nextOrder,prevIoUsOrder: prevOrder,}).then((res) => {
let image = {}
let infopackAsset = e.moved.element.infopackAsset
image = {...res,infopackAsset};
Vue.set(this.imageList,newIndex,image)
this.loading = false
return this.imageList
});
} catch (e) {
console.log(e,'this is put error for tab change')
}
},
解决方法
Array.prototype.filter 不会就地修改数组,它返回一个新数组。所以这个突变永远不会改变任何状态:
mutations: {
setImageData(state:any,infopackImageData: any) {
state.infoPackCreationTab.infopackContents.filter((item: any) => {if(item.type === "IMAGE")
item = infopackImageData
console.log(item,'this is items');
return item})
}
},
因此,如果您打算更改 state.infoPackCreationTab.infopackContents
,则需要分配 filter() 的结果:
mutations: {
setImageData(state:any,infopackImageData: any) {
state.infoPackCreationTab.infopackContents = state.infoPackCreationTab.infopackContents.filter(...)
然而,由于 state.infoPackCreationTab
在初始化期间没有 infopackContents
属性,除非您使用 Vue.set() 或只是替换整个 {带有新对象的 {1}} 对象(请参阅:Vuex on reactive mutations):
infoPackCreationTab