h1 {
color: #333;
text-align: center;
}
p {
font-size: 18px;
color: #666;
text-align: center;
}

JavaScript Validation Alert

JavaScript can be used to validate user input and display alerts when there are errors in a form submission.

Name:

Email:

Submit

function validateForm() {
var name = document.getElementById(“name”).value;
var email = document.getElementById(“email”).value;

if (name === “” || email === “”) {
alert(“Please fill out all fields before submitting.”);
} else {
alert(“Form submitted successfully!”);
}
}

In this example, we have a simple form that asks for the user’s name and email address. We have added the “required” attribute to both input fields to ensure that they are not left blank.

When the user clicks the submit button, the JavaScript function validateForm() is called. This function gets the values of the name and email input fields and checks if they are empty. If either field is empty, an alert is displayed asking the user to fill out all fields. Otherwise, a success alert is displayed.

JavaScript alert messages are a helpful way to provide feedback to users when they submit a form. With some simple validation logic, you can ensure that users provide all necessary information before proceeding.