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First, I have to validate that id and password textboxes are not empty(That one's working). Then I have to validate on the same form that id on textbox needs to be a number and also a number between 3000 and 3999 (That one doesn't work). Any ideas on what's wrong with my code?
function validatefunctions() {
if (document.getElementById('idtb').value === '') {
alert('You need to enter a Customer ID');
return false;
}
if (document.getElementById('pwtb').value === '') {
alert('Please enter your password');
return false;
}
var custID;
custID = document.getElementsByName("idtb").valueOf();
if (custID !== isNan) {
alert("Customer ID needs to be numeric");
return false;
}
if (custID < 3000) {
alert("ID must be above 3000");
return false;
}
if (custID > 3999) {
alert("ID must be below 3999");
return false;
}
}
211
asked Jun 18 '26 21:06
function validatefunctions() {
if (document.getElementById('idtb').value === '') {
alert('You need to enter a Customer ID');
return false;
}
if (document.getElementById('pwtb').value === '') {
alert('Please enter your password');
return false;
}
var custID = document.getElementById('idtb').value;
if (Number.isNaN(parseInt(custID))) {
alert("Customer ID needs to be numeric");
return false;
}
if (parseInt(custID) < 3000) {
alert("ID must be above 3000");
return false;
}
if (parseInt(custID) > 3999) {
alert("ID must be below 3999");
return false;
}
}<!DOCTYPE html>
<html>
<body>
<form action="#" onsubmit="return validatefunctions()" method="post">
Customer ID: <input type="text" name="idtb" id="idtb"><br /><br />
Password: <input type="text" name="pwtb" id="pwtb"><br /><br />
<input type="submit" value="Submit">
</form>
</body>
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