I have attached event handler to the noOfPeople input and in the event handler I call another function which is called validate field which calls validator on each input and from the validators whcih the validateField calls in the validatorSelectTip function the this keyword refers to undefined. why is that because I have attached the bind keyword when I call the event handler on the "noOfPeople" input. this is the live-site url: https://aemrobe.github.io/Tip-calculator-app-main/ this is the git repo: https://github.com/aemrobe/Tip-calculator-app-main.git