I can get the dataSource2 (example from angular library) to show correctly, but the dataSource variable (my datasource) does not render.
I am not sure why this is the case. I have made both data sources look similar, and the way I use the angular material library is also similar. I need some input; is it the way Material library works?
See image - Message on dataSource not rendered
My .ts file
import { Component, OnInit, Input } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { BackendcallingService } from './../backendcalling.service';
import { AvailableRolesEntity, RoleFunctionsEntity, ChildRolesEntity } from 'src/models/AvailableRoles.model';
import { MatTableDataSource } from '@angular/material';
@Component({
selector: 'app-roles',
templateUrl: './roles.component.html',
styleUrls: ['./roles.component.css']
})
export class RolesComponent implements OnInit {
jsondata: any;
jsonifiedrole: any;
availableRoles: any;
jsonifiedavailableRoles: any[];
dataSource: any = [];
dataSource2: any =[];
displayedColumns: string[] = ['position', 'name', 'weight', 'symbol']; // columns for example dataSource2
columnsToDisplay = ['name', 'priority', 'editUrl', 'active', 'createdId']; // columns for my dataSource
ELEMENT_DATA: any[] = [
{ position: 1, name: 'Hydrogen', weight: 1.0079, symbol: 'H' },
{ position: 2, name: 'Helium', weight: 4.0026, symbol: 'He' },
{ position: 3, name: 'Lithium', weight: 6.941, symbol: 'Li' },
{ position: 4, name: 'Beryllium', weight: 9.0122, symbol: 'Be' },
];
svc: any;
http: any;
response: any;
constructor(http: HttpClient, svc: BackendcallingService) {
this.http = http;
this.svc = svc;
}
ngOnInit() {
this.http.get('http://localhost:8080/epsdk-app-os/get_role?role_id=undefined')
.subscribe(response => {
this.response = response;
this.jsondata = (JSON.parse(response.data));
this.role = this.jsondata.role;
this.jsonifiedrole = JSON.parse(this.role);
this.availableRoles = this.jsondata.availableRoles;
this.jsonifiedavailableRoles = JSON.parse(this.availableRoles);
this.dataSource2 = new MatTableDataSource<any>(this.ELEMENT_DATA); // example data source
this.dataSource = new MatTableDataSource<any>(this.jsonifiedavailableRoles); //my datasource
console.log(this.jsondata);
console.log(this.role);
console.log(this.jsonifiedrole);
console.log(this.availableRoles);
console.log(this.jsonifiedavailableRoles);
})
}
}
The jsonifiedavailableRoles looks like this. I don't know how it is different from ELEMENT_DATA which does get rendered as dataSource2
See image - jsonifiedavailableRoles looks like this
My .html file
<div>
<table mat-table [dataSource]="dataSource2" class="mat-elevation-z8">
<ng-container matColumnDef="position">
<th mat-header-cell *matHeaderCellDef> No. </th>
<td mat-cell *matCellDef="let element"> {{element.position}} </td>
</ng-container>
<ng-container matColumnDef="name">
<th mat-header-cell *matHeaderCellDef> Name </th>
<td mat-cell *matCellDef="let element"> {{element.name}} </td>
</ng-container>
<ng-container matColumnDef="weight">
<th mat-header-cell *matHeaderCellDef> Weight </th>
<td mat-cell *matCellDef="let element"> {{element.weight}} </td>
</ng-container>
<ng-container matColumnDef="symbol">
<th mat-header-cell *matHeaderCellDef> Symbol </th>
<td mat-cell *matCellDef="let element"> {{element.symbol}} </td>
</ng-container>
<tr mat-header-row *matHeaderRowDef="displayedColumns"></tr>
<tr mat-row *matRowDef="let row; columns: displayedColumns;"></tr>
</table>
</div>
<div>
<br>
<table> mat-table [dataSource]="dataSource">
<ng-container matColumnDef="name">
<th mat-header-cell *matHeaderCellDef> Name </th>
<td mat-cell *matCellDef="let element"> {{element.name}} </td>
</ng-container>
<ng-container matColumnDef="priority">
<th mat-header-cell *matHeaderCellDef> Priority </th>
<td mat-cell *matCellDef="let element"> {{element.priority}} </td>
</ng-container>
<ng-container matColumnDef="editUrl">
<th mat-header-cell *matHeaderCellDef> Edit </th>
<td mat-cell *matCellDef="let element"> {{element.editUrl}} </td>
</ng-container>
<ng-container matColumnDef="active">
<th mat-header-cell *matHeaderCellDef> Active? </th>
<td mat-cell *matCellDef="let element"> {{element.active}} </td>
</ng-container>
<ng-container matColumnDef="createdId">
<th mat-header-cell *matHeaderCellDef> Delete </th>
<td mat-cell *matCellDef="let element"> {{element.createdId}} </td>
</ng-container>
<tr mat-header-row *matHeaderRowDef="columnsToDisplay"></tr>
<tr mat-row *matRowDef="let row; columns: columnsToDisplay;"></tr>
columnsToDisplay
should match to your html markup.
columnsToDisplay = ['name', 'priority', 'editUrl', 'active', 'createdId']; // columns for my dataSource
<td mat-cell *matCellDef="let element"> {{element.name}} </td>
Also change the html,
<tr mat-header-row *matHeaderRowDef="columnsToDisplay"></tr>
<tr mat-row *matRowDef="let row; columns: columnsToDisplay;"></tr>
Also in your get() inside ngOnInit, pass this.jsonifiedavailableRoles
this.dataSource = new MatTableDataSource<any>(this.jsonifiedavailableRoles);
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