I found this answer for sending a single value to a function onClick. Is it possible to send two? I've tried
        <button value={valueA, valueB } onClick={ () => this.toggleEditing.bind(this, valueA, valueB) } className="slds-button slds-button--icon">
        <svg className="slds-button__icon" aria-hidden="true">
          <use xlinkHref={closeIcon}></use>
        </svg>
          <span className="slds-assistive-text">Cancel</span>
        </button>
But my second argument in toggleEdit() is the mouse event.