function calculateTip() {
var billAmt = document.getElementById("billamt").value;
var serviceQual = document.getElementById("serviceQual").value;
var numOfPeople = document.getElementById("peopleamt").value;
//validate input
if (billAmt === "" || serviceQual == 0) {
alert("Please enter values");
return;
}
//Check to see if this input is empty or less than or equal to 1
if (numOfPeople === "" || numOfPeople <= 1) {
numOfPeople = 1;
document.getElementById("each").style.display = "none";
} else {
document.getElementById("each").style.display = "block";
}
//Calculate tip
var total = billAmt * serviceQual / numOfPeople;
//round to two decimal places
total = Math.round(total * 100) / 100;
//next line allows us to always have two digits after decimal point
total = total.toFixed(2);
//Display the tip
document.getElementById("totalTip").style.display = "block";
document.getElementById("tip").innerHTML = total;
}
//Hide the tip amount on load
document.getElementById("totalTip").style.display = "none";
document.getElementById("each").style.display = "none";
//click to call function
document.getElementById("calculate").onclick = function() {
calculateTip();
};