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fix: do not mutate children in deeper levels #947

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fix: do not mutate children in deeper levels #947

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31 changes: 26 additions & 5 deletions src/DraggableTreeviewNode.vue
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Original file line number Diff line number Diff line change
Expand Up @@ -39,7 +39,7 @@
:group="group"
:value="value.children"
ghost-class="ghost"
@input="updateValue"
@change="updateValue"
>
<treeview-node
v-for="child in value.children"
Expand Down Expand Up @@ -109,7 +109,10 @@ export default Vue.extend({
data() {
return {
open: false,
localValue: { ...this.value } as TreeItem,
localValue: {
...this.value,
children: [...this.value.children],
} as TreeItem,
};
},
computed: {
Expand All @@ -125,12 +128,30 @@ export default Vue.extend({
},
watch: {
value(value): void {
this.localValue = { ...value };
this.localValue = {
...value,
children: [...this.value.children],
};
},
},
methods: {
updateValue(value: TreeItem[]): void {
this.localValue.children = [...value];
updateValue($event: any): void {
// removing must be done before adding
// in order for the event `moved` to work properly
const dataForRemoving = $event.removed || $event.moved;
if (dataForRemoving) {
this.localValue.children.splice(dataForRemoving.oldIndex, 1);
}

const dataForAdding = $event.added || $event.moved;
if (dataForAdding) {
this.localValue.children.splice(
dataForAdding.newIndex,
0,
dataForAdding.element
);
}

Comment on lines +138 to +154
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the mutating error is fixed by the 2 other changes that create a shallow copy of children for localValue

but without this change, a strange bug appears :

Screen.Recording.2023-11-02.at.15.22.15.mov

on drag/drop, multiple updates occur :

  1. the child "test 2" gets updated with its now 4 children
  2. the parent "Plats cuisinés" gets updated with its now only 1 child "test 2" (but the value passed of "test 2" has only the 3 original children, not the now 4)

this.$emit("input", this.localValue);
},
updateChildValue(value: TreeItem): void {
Expand Down