角材料表未显示数据 [英] Angular material table not showing data
问题描述
想要在客户端进行分页和排序的人,请参考此链接
People who want paging and sorting on client side please refer this link
这是我尝试过的.数据正在控制台中加载.但它不会显示在网格或席子表上.
Here is what I tried. The data is loading in the console. but it is not displayed on the grid or mat table.
我在控制台中没有任何错误.我可以在控制台中看到数据,但是数据没有加载到网格中.
I don't have any error in the console. I am able to see the data in the console but the data is not loaded into the grid.
有人可以告诉我我在做什么错吗?
Can somebody tell me what am I doing wrong?
从中发出数据的实际数据库.
The actual database from where data is emitted out.
export class FormsDatabase {
formsList = new BehaviorSubject([]);
get data(){
return this.formsList.value;
}
constructor(private _formsServicedata: FormsService){
this._formsServicedata.getAllFormData('').subscribe((form)=>{
console.log("Form DataSource: ");
this.formsList.next(form);
})
}
}
export class FormDataSource extends DataSource<any>{
constructor( private formsDb: FormsDatabase,public
paginator:MatPaginator , public sort: MatSort
) {
super()
}
connect():Observable<any>{
const formsData=[
this.formsDb.formsList ,
this.sort.sortChange
];
return Observable.merge(...formsData).map(()=>{
this.getSortedData();
})
}
排序功能以对数据进行排序
Sort Function to sort the data
getSortedData(){
const data = this.formsDb.data.slice();
if(!this.sort.active || this.sort.direction==''){ return data;}
return data.sort((a,b)=>{
let propertyA:number|string='';
let propertyB:number|string='';
switch(this.sort.active)
{
case 'formname': [propertyA,propertyB]=
[a.formname,b.formname];break;
case 'displaytext': [propertyA,propertyB]=
[a.displaytext,b.displaytext];break;
case 'sortorder': [propertyA,propertyB]=
[a.sortorder,b.sortorder];break;
}
let valueA = isNaN(+propertyA) ? propertyA : +propertyA;
let valueB = isNaN(+propertyB) ? propertyB : +propertyB;
return (valueA < valueB?-1:1)*(this.sort.direction=='asc'?1:-1);
});
}
disconnect() { }
}
HTML
<mat-table #table [dataSource]="dataSource" matSort>
<ng-container matColumnDef="formname">
<mat-header-cell *matHeaderCellDef mat-sort-header> FORM NAME
</mat-header-cell>
<mat-cell *matCellDef="let element"> {{element.formname}}
</mat-cell>
</ng-container>
<ng-container matColumnDef="displaytext">
<mat-header-cell *matHeaderCellDef mat-sort-header> DISPLAY TEXT </mat-header-cell>
<mat-cell *matCellDef="let element"> {{element.displaytext}} </mat-cell>
</ng-container>
<ng-container matColumnDef="sortorder">
<mat-header-cell *matHeaderCellDef mat-sort-header> SORT ORDER</mat-header-cell>
<mat-cell *matCellDef="let element"> {{element.sortorder}} </mat-cell>
</ng-container>
<mat-header-row *matHeaderRowDef="displayedColumns"></mat-header-row>
<mat-row *matRowDef="let row; columns: displayedColumns;"></mat-row>
</mat-table>
<mat-paginator #paginator
[pageSize]="10"
[pageSizeOptions]="[5, 10, 20]"
[showFirstLastButtons]="true">
</mat-paginator>
</div>
服务:
Forms Service具有以下方法,该方法可将表单列表返回为可见
Forms Service has the below method which returns the forms list as observable
getAllFormData(orderBy:string) {
return this.af.list('/forms');
}
推荐答案
我重现了您的代码,就像您一样,我无法使其像角度材料团队提供的示例一样工作,但是我使用了一种变通方法来实现排序功能有效.
I reproduce your code and just like you I can't make it works as the examples provided by angular material team but I used a workaround to make the sort function works.
export class FormDataSource extends DataSource<any> {
constructor(private formsDb: FormsDatabase, public paginator: MatPaginator,
public sort: MatSort) {
super();
this.sort.sortChange.subscribe(t =>
this.formsDb.formsList.next(this.getSortedData()));
}
connect(): Observable<any[]> {
return this.formsDb.formsList;
}
getSortedData () {
const data = this.formsDb.data.slice();
if (!this.sort.active || this.sort.direction === '') {
return data;
}
return data.sort((a, b) => {
let propertyA: number | string = '';
let propertyB: number | string = '';
switch (this.sort.active) {
case 'formname':
[propertyA, propertyB] =
[a.formname, b.formname];
break;
case 'displaytext':
[propertyA, propertyB] =
[a.displaytext, b.displaytext];
break;
case 'sortorder':
[propertyA, propertyB] =
[a.sortorder, b.sortorder];
break;
}
const valueA = isNaN(+propertyA) ? propertyA : +propertyA;
const valueB = isNaN(+propertyB) ? propertyB : +propertyB;
return (valueA < valueB ? -1 : 1) * (this.sort.direction == 'asc' ? 1 : -1);
});
}
disconnect() {
}
}
查看初始化之后
应用过滤器后
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