How TO - JS Validation For Empty Fields

Learn how to add form validation for empty input fields with JavaScript.

Form Validation For Empty Inputs

If an input field (fname) is empty, this function alerts a message, and returns false, to prevent the form from being submitted:

function validateForm() {
var x = document.forms["myForm"]["fname"].value;
if (x == "") {
alert("Name must be filled out");
return false;
}
}