Angular2-sa datatable仅第一次加载数据
数据网格:Angular2-sa datatable仅第一次加载数据,angular,datatable,smartadmin,Angular,Datatable,Smartadmin,数据网格: <sa-datatable [options]="{ data: bundles, columns: [ {data: 'srNo'}, {data: 'name'}, { data: null, defaultContent: '<button class=\'btn btn-default\'>Details</button>' } ] }" pagina
<sa-datatable [options]="{
data: bundles,
columns: [ {data: 'srNo'}, {data: 'name'}, { data: null, defaultContent: '<button class=\'btn btn-default\'>Details</button>' } ] }"
paginationLength="true" tableClass="table table-striped table-bordered table-hover" width="100%">
<thead>
<tr>
<th data-hide="phone">Sr. No.</th>
<th data-class="expand"><i class="text-muted hidden-md hidden-sm hidden-xs"></i> Name</th>
<th></th>
</tr>
</thead>
</sa-datatable>
<div> {{bundles.length }} </div>
Component({
selector: 'tax-receipting-bundles',
templateUrl: './tax-receipting-bundles.component.html',
providers: [ TaxReceiptingBundleService ]
})
export class TaxReceiptingBundlesComponent implements OnInit {
bundles: TaxReceiptingBundle[];
constructor(private service: TaxReceiptingBundleService) {
this.bundles = [];
}
ngOnInit() {
this.service.getBundles()
.then(b=> {
this.bundles = b;
console.log(this.bundles);
});
}
服务:
@Injectable()
export class TaxReceiptingBundleService {
getBundles() {
return Promise.resolve(TAXRECEIPTINGBUNDLES);
}
}
模拟数据
export const TAXRECEIPTINGBUNDLES: TaxReceiptingBundle[] = [
{id: 1, srNo: 1, name: 'Bundles for February 2005'},
{id: 2, srNo: 2, name: 'CDN Bundles'},
.
.
{id: 12, srNo: 12, name: 'Bundles for April 2004'},
];
当我导航到包含datagrid的组件时,它正确地显示了数据(12条记录)
但是,当我离开并返回到同一组件时,网格是空的。但是,ngOnInit()
中的console.log
始终记录所有12条记录。但它们刚刚出现在网格中
但是bundles.length
会在表下打印12-
如何修复此问题?似乎第二次以后,
datatable
在获取用于绑定的数据之前被渲染
我尝试使用setTimeOut
,但没有成功。对我有效的方法是使用
我编写了一个resolver服务
,它返回类型为taxereceiptingbundle[]
的Promise
:
@Injectable()
export class TaxReceiptingBundlesResolver implements Resolve< TaxReceiptingBundle[]> {
constructor(private cs: TaxReceiptingBundlesService, private router: Router) {}
resolve(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): Promise<TaxReceiptingBundle[]> {
return this.cs.getBundles().then(c => {
if (c) {
return c;
} else {
this.router.navigate(['/home']);
return null;
}
});
}
}
在组件中,我不是从TaxReceiptingBundleService获取数据,而是从route对象获取数据
constructor(private router: Router) { }
ngOnInit() {
this.route.data
.subscribe((data: { bundles: TaxReceiptingBundle[] }) => {
..
});
}
现在,导航正在等待TaxReceiptingBundle的列表。我遇到了同样的问题,并提出了一个可能更简单的解决方案(尽管它仍然感觉像是一个解决方法) 在component类中,我定义了一个变量
dataAvailable
,默认情况下该变量为false
,并在加载数据后设置为true
export class TaxReceiptingBundlesComponent implements OnInit {
bundles: TaxReceiptingBundle[];
dataAvailable: boolean = false;
constructor(private service: TaxReceiptingBundleService) {
this.bundles = [];
}
ngOnInit() {
this.service.getBundles()
.then(b=> {
this.bundles = b;
this.dataAvailable = true;
});
}
在组件的html文件中,只需隐藏表格小部件,直到数据可用:
<sa-datatable *ngIf="dataAvailable" [options]="..." ...>
...
</sa-datatable>
...
这不会阻止页面被加载,只会阻止表被加载。我仍然在寻找一个在sa datatable模块或-组件级别上工作的解决方案,这样在我的组件中,我就可以不用任何变通方法就直接使用datatables了
<sa-datatable *ngIf="dataAvailable" [options]="..." ...>
...
</sa-datatable>