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CAN NOT expand Angular Material table

By : Janak Savaliya
Date : October 18 2020, 06:10 PM
I hope this helps . The key to this working is when: isExpansionDetailRow which calls the following function expression... it essentially evaluates each object in the MatTableDataSource for a property of detailRow and returns true if present.
code :
isExpansionDetailRow = (i: number, row: Object) =>
export class ExampleDataSource extends DataSource<any> {
  /** Connect function called by the table to retrieve one stream containing the data to render. */
  connect(): Observable<Element[]> {
    const rows = [];
    ELEMENT_DATA.forEach(element => rows.push(element, { detailRow: true, element }));
    return of(rows);

  disconnect() { }

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Angular Material Table expand row on column/icon click

By : Sean
Date : March 29 2020, 07:55 AM
Any of those help There are numerous questions regarding this topic specifically with regards to expanding rows. However, all implementations I have seen are done by either using accordion/panels styled like tables (which require more things to be done to accommodate pagination and sorting), using the when predicate (which seems to have issues when trying to utilize pagination), or what seems to be the ideal solution is to have a directive attached to the mat-row element. , This is a slightly hacky way of doing it but it works:
code :
<!-- Name Column -->
<ng-container matColumnDef="name">
    <mat-header-cell *matHeaderCellDef> Name </mat-header-cell>
    <mat-cell *matCellDef="let element"><span (click)="showDetails($event, element)">{{element.name}}</span> 
showDetails(event: UIEvent, element): void {
    // Do whatever with the element

Expand and collapse table row in angular material

By : Sam Azpan
Date : March 29 2020, 07:55 AM
Hope that helps Below is the example where only expansion is happening, but I want the row to collapse when you click it. , Replace (click)="expandedElement = row"

Expand Angular Material expansion table row via TypeScript

By : user2253045
Date : March 29 2020, 07:55 AM
To fix this issue Here is an example allowing you to extend a default table row. I hope this will help you. You will only need to retrieve the index from the tab previously opened in your data list.
code :
export class TableExpandableRowsExample implements OnInit {
  dataSource = ELEMENT_DATA;
  columnsToDisplay = ['name', 'weight', 'symbol', 'position'];
  expandedElement: PeriodicElement | null;

  ngOnInit() {
    this.expandedElement = ELEMENT_DATA[2];
<ng-container matColumnDef="expandedDetail">
  <td mat-cell *matCellDef="let element" [attr.colspan]="columnsToDisplay.length">
    <div class="example-element-detail" [@detailExpand]="element == expandedElement ? 'expanded' : 'collapsed'">
      <div class="example-element-diagram">
        <div class="example-element-position"> {{element.position}} </div>
        <div class="example-element-symbol"> {{element.symbol}} </div>
        <div class="example-element-name"> {{element.name}} </div>
        <div class="example-element-weight"> {{element.weight}} </div>
      <div class="example-element-description">
        <span class="example-element-description-attribution"> -- Wikipedia </span>

Adding Angular material Menu to each row in Angular Material Table using more button at the end of a sticky table

By : user2608190
Date : March 29 2020, 07:55 AM
To fix this issue I have a sticky table that I want to add more_vert button toggle to but I'm unable to achieve this because I don't know how to distinguish each drop down menu list from each other. , You are referencing wrong menu.
code :

Angular Material Expansion Panels: How to expand initially, but then let the user expand/collapse as they please

By : Francisco Javier Fal
Date : March 29 2020, 07:55 AM
this will help You can make a boolean in the Component and set it to item.data.length === 0 and just check that in the template.
code :
public expanded: boolean = this.item.data.length === 0;

<mat-expansion-panel [expanded]="expanded">
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