ng2smart table - send JSON data on selecting multiple row

On submit button: submitForm() {
this.submitData = this.portfolioData;
console.log(JSON.stringify(this.submitData, null, 2));
}

Event for state selection:
onUserRowSelect(event) {
this.selectedState = event.data;
console.log(JSON.stringify(this.selectedState, null, 2));
}

Coudnt able to submit data from multiple row selection