我正在使用 DevExpress 的 DevExtreme 和 Angular2。我有一个数据网格(如下)列出了状态并要求用户选择一些状态。有可能一些状态已经存储在数据库中。如何设置先前选择的状态?我可以在文档中看到我应该使用 dataGrid.instance.selectRows(arrayOfPreviouslySelectedStates)
但是 dataGrid 在我尝试设置它之后的某个时间实例化它在 ngOnInit()
.
我的 HTML 网格:
<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>
我的组件:
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);
}
}
}
最佳答案
感谢@yurzui 的评论,我能够通过以下方式解决我的问题。 [selectedRowKeys]
处理所有预选。它的“问题”是在进行其他选择时它不会自行更新。因此,我监听了 onSelectionChanged
并将包含有关选择的许多数据的事件传递到我的自定义函数中,该函数更新了 selectedStates
然后我用它来保存数据单击保存按钮时保存到数据库。
从数据库中获取预选状态
public getCompanyStates = (): void => {
this.CompanyService.getStates().subscribe((states) => {
this.selectedStates = states;
});
}
事件处理器
public onSelectionChanged = (e): void => {
this.selectedStates = e.selectedRowKeys;
}
HTML 的 dx-data-grid 部分
<dx-data-grid #statesGrid id="statesContainer"
(onSelectionChanged)="onSelectionChanged($event)"
[selectedRowKeys]="selectedStates"
[dataSource]="states">
...
</dx-data-grid>
关于javascript - DevExpress的DevExtreme for Angular2及预选,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/42638480/