ag grid checkbox selection get selected row data

**** how ag grid click on checkbox get select row data****

***> any one help how can achieve thanks advance the requirement is simple i want to click on checkbox and get selected row data i use onSelectionchange method from ag grid documentation but resolve my problems`

`*** 
*typescript code try*


 onSelectionChanged(params) {      
        let selectedRow = params.api.getSelectedNodes();
        this.selectedCustomerFilter.push(selectedRow.find(function (item) {
            debugger
            return item.rowIndex 
        }));
        if (this.selectedCustomerFilter.length > 0) {
            this.tblSearchbarHidden = true;
        } else {
            this.tblSearchbarHidden = false;
        }
        this.selectedCustomerFilter.forEach((element, rowIndex) => {
            if (rowIndex > 4) {
                this.selectedCustomerFilter.pop(params, 1);
                element.setSelected(false);
                this.alertService.info("You can only compare up to five selections")
                return
            }
        })
      }

**and html**
 


 <ag-grid-angular>
    [onSelectionChanged]="onSelectionChanged($event)"
    </ag-grid-angular>