javascript - Vue removing wrong HTML node in dynamic list of components -


i'm experimenting vue.js , composing components dynamically.

there's strange issue although seems updating data correctly, if remove 1 of boxes call splice() removes last item in rendered html.

here's example fiddle. i'm testing in chrome.

https://jsfiddle.net/afz6jjn0/

just posterity, here's vue component code:

vue.component('content-longtext', {   template: '#content-longtext',   props: {     model: { type: string, required: true },     update: { type: function, required: true }   },   data() {     return {       inputdata: this.model     }   },   methods: {     updatecontent(event) {       this.update(event.target.value)     }   }, })  vue.component('content-image', {   template: '#content-image', })  vue.component('content-list', {   template: '#content-list-template',   props: {     remove: { type: function, required: true },     update: { type: function, required: true },     views: { type: array, required: true }   },   methods: {     removecontent(index) {       this.remove(index)     },     updatecontent(index) {       return (content) => this.update(index, content)     },   }, })  vue.component('content-editor', {   template: '#content-editor',   data() {     return {       views: [         {type: 'content-longtext', model: 'test1'},         {type: 'content-longtext', model: 'test2'},         {type: 'content-longtext', model: 'test3'},         {type: 'content-longtext', model: 'test4'},         {type: 'content-longtext', model: 'test5'},       ],     }   },   methods: {     newcontentblock(type) {       this.views.push({type: 'content-longtext', model: ''})     },     updatecontentblock(index, model) {       this.views[index].model = model     },     removecontentblock(index) {       this.views.splice(index, 1)     },   }, })  let app = new vue({   el: '#app' })

i've managed fix issue this documentation.

the crux of if don't have unique key already, need store array index of object in object itself, because mutate source array mutating it's keys , far vue concerned when renders, last item missing, not removed item.

views: [   {index: 0, type: 'content-longtext', model: 'test1'},   {index: 1, type: 'content-longtext', model: 'test2'},   {index: 2, type: 'content-longtext', model: 'test3'},   {index: 3, type: 'content-longtext', model: 'test4'},   {index: 4, type: 'content-longtext', model: 'test5'}, ],  ...  newcontentblock(type) {   this.views.push({index: this.views.length, type: 'content-longtext', model: ''}) },

once have stored array index need add :key binding iterator in template, , bind stored value.

<div v-for="(currentview, index) in views" :key="currentview.index">   <component :is="currentview.type" :model="currentview.model" :update="updatecontent(index)"></component>   <a v-on:click="removecontent(index)">remove</a> </div>

finally must make sure preserve integrity of indexes when mutate array.

removecontentblock(index) {   this.views     .splice(index, 1)     .map((view, index) => view.index = index) },

https://jsfiddle.net/afz6jjn0/5/


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