How TO - JS Validation For Empty Fields
Learn how to add form validation for empty input fields with JavaScript.
Form Validation For Empty Inputs
Step 1) Add HTML:
Example
<form name="myForm" action="/action_page.php" onsubmit="return validateForm()"
method="post" required>
Name: <input type="text" name="fname">
<input type="submit" value="Submit">
</form>
Step 2) Add JavaScript:
If an input field (fname) is empty, this function alerts a message, and returns false, to prevent the form from being submitted:
Example
function validateForm() {
var x =
document.forms["myForm"]["fname"].value;
if (x == "") {
alert("Name must be filled out");
return false;
}
}
Try it Yourself »
