Expanding in Angular Material - html-table

Question

I am using Angular Material for displaying content.
My TS code is:
import { Component, OnInit, ViewChild } from '#angular/core';
import { AdminReassignTaskService } from 'src/app/services/admin-reassign-task.service'
import { Location } from '#angular/common';
import { trigger, state, transition, animate, style } from '#angular/animations';
#Component({
selector: 'app-admin-reassign-task',
templateUrl: './admin-reassign-task.component.html',
animations: [
trigger('detailExpand', [
state('collapsed', style({height: '0px', minHeight: '0', display: 'none'})),
state('expanded', style({height: '*'})),
transition('expanded <=> collapsed', animate('225ms cubic-bezier(0.4, 0.0, 0.2, 1)')),
]),
],
styleUrls: ['./admin-reassign-task.component.scss']
})
export class AdminReassignTaskComponent implements OnInit {
reassignedlist;
columnsToDisplay = ['test'];
#ViewChild('expandedElement') expandedElement;
displayedColumns = ['comment'];
taskList;
constructor(private serv: AdminReassignTaskService,public _location: Location) { }
ngOnInit() {
this.serv.getByURL('admin/list').subscribe(response => {
this.reassignedlist=response;
})
}
editReassigned(i,element){
const result = [this.reassignedlist.find( ({ id }) => id === i )];
this.taskList=result;
this.expandedElement = this.expandedElement === element ? null : element ;
}
}
And my HTML Code is
<div class="main-content-wraper">
<ng-container>
<div class="mat-elevation-z2 card rounded-0 p-3 d-flex flex-row flex-wrap" >
<table mat-table [dataSource]="reassignedlist" multiTemplateDataRows class="mat-elevation-z8 w-100 custom-table">
<ng-container matColumnDef="task_name">
<th mat-header-cell *matHeaderCellDef> Task Name </th>
<td mat-cell *matCellDef="let element"> {{element.taskName}} </td>
</ng-container>
<ng-container matColumnDef="action">
<th mat-header-cell *matHeaderCellDef> </th>
<td mat-cell *matCellDef="let element">
<button mat-icon-button matTooltip="View Task" (click)="editReassigned(element.id,element)" ><mat-icon >flag</mat-icon></button>
</td>
</ng-container>
<ng-container matColumnDef="expandedDetail">
<td mat-cell *matCellDef="let element" [attr.colspan]="columnsToDisplay.length">
<div class="example-element-detail" [#detailExpand]="element == expandedElement ? 'expanded' : 'collapsed'">
<table mat-table [dataSource]="taskList" class="task-card" >
<ng-container matColumnDef="comment">
<th mat-header-cell *matHeaderCellDef> Assigned User Comment</th>
<td mat-cell *matCellDef="let element" matTooltip="Assigned User Comment"> {{element.assignedUserCmt}} </td>
</ng-container>
<tr mat-row *matRowDef="let row; columns: displayedColumns;"></tr>
</table>
</div>
</td>
</ng-container>
<tr mat-header-row *matHeaderRowDef="columnsToDisplay"></tr>
<tr mat-row *matRowDef="let element; columns: columnsToDisplay;"
class="example-element-row"
[class.example-expanded-row]="expandedElement === element" >
</tr>
<tr mat-row *matRowDef="let row; columns: ['expandedDetail']" class="example-detail-row"></tr>
</table>
</div>
</ng-container>
</div>
By this code, Main Table and Onclicking ICON in the main table Second table expands and I can View Data. But,
1) 2nd Table not Displaying Heading to it. What is the Wrong Coding Here?
2) After 2 Table I wanted to add some 4-5 Input Field in this Expand and collapse manner. How I can ADD without a table?
3) Here Attached Image (Output of current Coding). Kindly let me know anyone having an answer with you.

Answer 1

I think you need to be using expansion panels as part of angular material accordion:
https://stackblitz.com/angular/dnbkkoraexxa?file=src%2Fapp%2Fexpansion-overview-example.ts