How to pass selected row value of table to button click event - Material design - Angular 6

Question

my previous question was not clear. Allow me to ask again clearly as I'm struggling complete my task.

I've mat-table along with checkbox for every row. (No master checkbox). whenever I select the row I should send the values of the selected row to button which is outside of the table.

[if I have a button inside the table, I could do that by accessing the default ELEMENT from *matCellDef="let element" variable if the button present inside the table.

But I don't know how to pass the selected row value to the button. I've to do routing based on the value from the selected row.

so far I've.

HTML

<div><button mat-button  [disabled]="!checkedbtn" (click)='linktomynxtpage()'>link to another page</button></div>

<table #demoTable mat-table [dataSource]="sample" multiTemplateDataRows>
// some ng-container with <th><td>

 <ng-container *ngIf="isAdmin" matColumnDef="actions">
    <th mat-header-cell *matHeaderCellDef> Action </th>
    <td mat-cell *matCellDef="let element">     
      <mat-checkbox class="select-checkbox" [(ngModel)]="checkedbtn" ></mat-checkbox>        
    </td>
  </ng-container>

  <tr mat-header-row *matHeaderRowDef="displayedColumns"></tr>
  <tr mat-row style="text-align:left" *matRowDef="let element; columns: displayedColumns;" ></tr>
  <tr mat-row *matRowDef="let row; columns: ['expandedDetail']" class="detail-row"></tr>
</table>

TS

linktomynxtpage(){
    //some logics
    //passing row value. and doing routing
    this.nxtPage.navigate(['/home/particular-user'])

}

Answer 1

use the (change) event

  <mat-checkbox class="select-checkbox" [(ngModel)]="checkedbtn" (change)="onChange(element)" ></mat-checkbox>  


onChange(row){
  // put the row whenever you want
}