DevExpress' DevExtreme for Angular2 and pre
I'm using DevExpress' DevExtreme with Angular2. I have a data grid (below) that lists states and asks the user to select some states. It is possible that some states have already been stored in the database. How do I set the previously selected states? I can see in the documentation that I should use dataGrid.instance.selectRows(arrayOfPreviouslySelectedStates) but dataGrid is instantiated sometime after I try to set it which is in the ngOnInit() .
My HTML grid:
<dx-data-grid #statesGrid id="statesContainer" [dataSource]="states" [selectedRowKeys]="[]" [hoverStateEnabled]="true" [showBorders]="true" [showColumnLines]="true" [showRowLines]="true" [rowAlternationEnabled]="true">
<dxo-sorting mode="multiple"></dxo-sorting>
<dxo-selection mode="multiple" [deferred]="true"></dxo-selection>
<dxo-paging [pageSize]="10"></dxo-paging>
<dxo-pager [showPageSizeSelector]="true" [allowedPageSizes]="[5, 10, 20]" [showInfo]="true"></dxo-pager>
<dxo-filter-row [visible]="true"></dxo-filter-row>
<dxi-column dataField="abbreviation" [width]="100"></dxi-column>
<dxi-column dataField="name"></dxi-column>
</dx-data-grid>
My componenet:
import 'rxjs/add/operator/switchMap';
import { Component, OnInit, ViewContainerRef, ViewChild } from '@angular/core';
import { CompanyService } from './../../../shared/services/company.service';
import { StateService } from './../../../shared/services/state.service';
import notify from 'devextreme/ui/notify';
import { DxDataGridModule, DxDataGridComponent } from 'devextreme-angular';
@Component({
selector: 'app-company-detail',
templateUrl: './company-detail.component.html'
})
export class CompanyDetailComponent implements OnInit {
@ViewChild(DxDataGridComponent) dataGrid: DxDataGridComponent;
companyStates: Array<ICompanyState>;
states: Array<IState>;
constructor(private CompanyService: CompanyService, private StateService: StateService) { }
ngOnInit() {
this.StateService.getStates().subscribe((states) => {
this.getSelectedStates();
this.states = states
});
}
public getSelectedStates = (): void => {
this.CompanyService.getStates(id).subscribe((states) => {
let preselectedStates: Array<IState> = this.companyStates.map((state) => {
return { abbreviation: state.Abbreviation, name: state.Name }
});
// I get an error here that says that dataGrid is undefined.
this.dataGrid.instance.selectRows(preselectedStates, false);
}
}
}
Thanks to @yurzui 's comment I was able to figure out my problems in the following way. [selectedRowKeys] deals with all preselection. It's "problem" is that it doesn't update itself when additional selections are made. So, I listened for onSelectionChanged and passed the event, which contains data about many things regarding selection, into my custom function which updates the selectedStates which I then use to save the data to the database when the save button is clicked.
Gets the preselected states from the database
public getCompanyStates = (): void => {
this.CompanyService.getStates().subscribe((states) => {
this.selectedStates = states;
});
}
Event handler
public onSelectionChanged = (e): void => {
this.selectedStates = e.selectedRowKeys;
}
The dx-data-grid portion of the HTML
<dx-data-grid #statesGrid id="statesContainer"
(onSelectionChanged)="onSelectionChanged($event)"
[selectedRowKeys]="selectedStates"
[dataSource]="states">
...
</dx-data-grid>