As you suggest, We Can Submit a form without the submit button using " Div block in Html web form page ".
The Code is the following :
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Submit Without Submit Button</title>
<script>
function submitForm() {
document.getElementById("subForm").submit();
alert("You Form Is Submitted Successfully");
}
</script>
</head>
<body>
form method="post" action="formController.php" id="subForm">
<input type="text" name="txtName" placeholder="Enter Your Name" /><br />
<input type="text" name="txtEmail" placeholder="Enter Your Email" /><br />
<input type="text" name="txtMobile" placeholder="Enter Your Mobile" /><br />
<textarea name="areaReply" placeholder="Enter Your Address"></textarea>
</form>
<div onclick="submitForm()" style="color:green;">Submit</div>
</body>
</html>