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web/admin: refactor table refresh to preserve selected/expanded elements correctly

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Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>
This commit is contained in:
Jens Langhammer 2022-05-23 20:07:56 +02:00
parent b2a42a68a4
commit 94257e0f50
1 changed files with 38 additions and 18 deletions
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48
web/src/elements/table/Table.ts
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@ -168,25 +168,45 @@ export abstract class Table<T> extends LitElement {
return;
}
this.isLoading = true;
return this.apiEndpoint(this.page)
.then((r) => {
this.data = r;
this.page = r.pagination.current;
r.results.forEach((res) => {
const selectedIndex = this.selectedElements.indexOf(res);
if (selectedIndex <= -1) {
this.selectedElements.splice(selectedIndex, 1);
try {
this.data = await this.apiEndpoint(this.page);
this.page = this.data.pagination.current;
const newSelected: T[] = [];
const newExpanded: T[] = [];
this.data.results.forEach((res) => {
const jsonRes = JSON.stringify(res);
// So because we're dealing with complex objects here, we can't use indexOf
// since it checks strict equality, and we also can't easily check in findIndex()
// Instead we default to comparing the JSON of both objects, which is quite slow
// Hence we check if the objects have `pk` attributes set (as most models do)
// and compare that instead, which will be much faster.
let comp = (item: T) => {
return JSON.stringify(item) === jsonRes;
};
if ("pk" in res) {
comp = (item: T) => {
return (
(item as unknown as { pk: string | number }).pk ===
(res as unknown as { pk: string | number }).pk
);
};
}
const expandedIndex = this.expandedElements.indexOf(res);
if (expandedIndex <= -1) {
this.expandedElements.splice(expandedIndex, 1);
const selectedIndex = this.selectedElements.findIndex(comp);
if (selectedIndex > -1) {
newSelected.push(res);
}
const expandedIndex = this.expandedElements.findIndex(comp);
if (expandedIndex > -1) {
newExpanded.push(res);
}
});
this.isLoading = false;
})
.catch(() => {
this.selectedElements = newSelected;
this.expandedElements = newExpanded;
} catch {
this.isLoading = false;
});
}
}
private renderLoading(): TemplateResult {