***

title: "BaseListComponent"
generated: true
---------------

<GenerationInfo sourceFile="packages/admin-ui/src/lib/core/src/common/base-list.component.ts" sourceLine="43" packageName="@vendure/admin-ui" />

This is a base class which implements the logic required to fetch and manipulate
a list of data from a query which returns a PaginatedList type.

It is normally used in combination with the [DataTable2Component](/current/core/reference/admin-ui-api/components/data-table2component#datatable2component).

```ts title="Signature"
class BaseListComponent<ResultType, ItemType, VariableType extends Record<string, any> = any> implements OnInit, OnDestroy {
    searchTermControl = new FormControl('');
    selectionManager = new SelectionManager<any>({
        multiSelect: true,
        itemsAreEqual: (a, b) => a.id === b.id,
        additiveMode: true,
    });
    result$: Observable<ResultType>;
    items$: Observable<ItemType[]>;
    totalItems$: Observable<number>;
    itemsPerPage$: Observable<number>;
    currentPage$: Observable<number>;
    protected destroy$ = new Subject<void>();
    protected refresh$ = new BehaviorSubject<undefined>(undefined);
    protected visibleCustomFieldColumnChange$ = new Subject<
        Array<DataTableCustomFieldColumnComponent<any>>
    >();
    constructor(router: Router, route: ActivatedRoute)
    setQueryFn(listQueryFn: ListQueryFn<ResultType>, mappingFn: MappingFn<ItemType, ResultType>, onPageChangeFn?: OnPageChangeFn<VariableType>, defaults?: { take: number; skip: number }) => ;
    refreshListOnChanges(streams: Array<Observable<any>>) => ;
    setPageNumber(page: number) => ;
    setItemsPerPage(perPage: number) => ;
    setVisibleColumns(columns: Array<DataTable2ColumnComponent<any>>) => ;
    refresh() => ;
    setQueryParam(hash: { [key: string]: any }, options?: { replaceUrl?: boolean; queryParamsHandling?: QueryParamsHandling }) => ;
    setQueryParam(key: string, value: any, options?: { replaceUrl?: boolean; queryParamsHandling?: QueryParamsHandling }) => ;
    setQueryParam(keyOrHash: string | { [key: string]: any }, valueOrOptions?: any, maybeOptions?: { replaceUrl?: boolean; queryParamsHandling?: QueryParamsHandling }) => ;
}
```

* Implements: OnInit, OnDestroy

<div className="members-wrapper">

### searchTermControl

\<MemberInfo kind="property" type={\`\`}   />

### selectionManager

\<MemberInfo kind="property" type={\`\`}   />

### result$

\<MemberInfo kind="property" type={`Observable<ResultType>`}   />

### items$

\<MemberInfo kind="property" type={`Observable<ItemType[]>`}   />

### totalItems$

\<MemberInfo kind="property" type={`Observable<number>`}   />

### itemsPerPage$

\<MemberInfo kind="property" type={`Observable<number>`}   />

### currentPage$

\<MemberInfo kind="property" type={`Observable<number>`}   />

### destroy$

\<MemberInfo kind="property" type={\`\`}   />

### refresh$

\<MemberInfo kind="property" type={\`\`}   />

### visibleCustomFieldColumnChange$

\<MemberInfo kind="property" type={\`\`}   />

### setQueryFn

\<MemberInfo kind="method" type={`(listQueryFn: ListQueryFn<ResultType>, mappingFn: MappingFn<ItemType, ResultType>, onPageChangeFn?: OnPageChangeFn<VariableType>, defaults?: { take: number; skip: number }) => `}   />

Sets the fetch function for the list being implemented.

### refreshListOnChanges

\<MemberInfo kind="method" type={`(streams: Array<Observable<any>>) => `}   />

Accepts a list of Observables which will trigger a refresh of the list when any of them emit.

### setPageNumber

\<MemberInfo kind="method" type={`(page: number) => `}   />

Sets the current page number in the url.

### setItemsPerPage

\<MemberInfo kind="method" type={`(perPage: number) => `}   />

Sets the number of items per page in the url.

### setVisibleColumns

\<MemberInfo kind="method" type={`(columns: Array<DataTable2ColumnComponent<any>>) => `}   />

### refresh

\<MemberInfo kind="method" type={`() => `}   />

Re-fetch the current page of results.

### setQueryParam

\<MemberInfo kind="method" type={`(hash: { [key: string]: any }, options?: { replaceUrl?: boolean; queryParamsHandling?: QueryParamsHandling }) => `}   />

### setQueryParam

\<MemberInfo kind="method" type={`(key: string, value: any, options?: { replaceUrl?: boolean; queryParamsHandling?: QueryParamsHandling }) => `}   />

### setQueryParam

\<MemberInfo kind="method" type={`(keyOrHash: string | { [key: string]: any }, valueOrOptions?: any, maybeOptions?: { replaceUrl?: boolean; queryParamsHandling?: QueryParamsHandling }) => `}   />

</div>