Email validation is an important aspect of form processing.
It ensures that the email address entered by the user is in the correct format and is a legitimate email address.
In this Javascript tutorial, we will go through the steps of validating an email address using JavaScript.
Regular Expression
The first step in validating an email address is to use a regular expression.
A regular expression is a pattern that can be used to match certain strings.
In this case, we will use a regular expression to match the format of an email address.
The following is the regular expression that can be used to validate an email address:
/^[a-zA-Z0-9._-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4}$/JavaScript Code
Once you have the regular expression, you can use it in your JavaScript code to validate an email address.
The following is an example of how to validate an email address using JavaScript:
function validateEmail(email) {
var re = /^[a-zA-Z0-9._-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4}$/;
return re.test(email);
}In the above code, the validateEmail function takes an email address as an argument and returns true if the email address is valid and false if it is not.
Using the Validation Function
Once you have the validation function, you can use it in your form processing code.
The following is an example of how to use the validation function in a form:
<form>
<label for="email">Email:</label>
<input type="text" id="email" name="email">
<button type="submit">Submit</button>
</form>
<script>
var form = document.querySelector("form");
form.addEventListener("submit", function(event) {
event.preventDefault();
var email = document.querySelector("#email").value;
if (validateEmail(email)) {
alert("Email address is valid");
} else {
alert("Email address is not valid");
}
});
</script>In the above code, we have a form with an email input field and a submit button.
When the form is submitted, the validation function is called, and an alert is displayed to the user indicating whether the email address is valid or not.
Conclusion
In this tutorial, we went through the steps of validating an email address using JavaScript.
We started with a regular expression that can be used to match the format of an email address.
Then, we created a JavaScript function that takes an email address as an argument and returns true if the email address is valid and false if it is not.
Finally, we used the validation function in a form to validate an email address entered by the user
