Using OnSubmit in JavaScript

onSubmit event performs a command or a set of commands when a user clicks the submit button on a form.
To use OnSubmit event
1.Create a function to run the specific commands when your form's submit button is clicked. Place the function in your HTML page header section.
function MyFormComm () {
alert('Your Text');
}
This function will make the alert box display when the submit button on your form in clicked (when your submit button code is correct).
2.Now call the function from your HTML page’s tag
< FORM onSubmit="MyFormComm ()" >
< input type=submit >
< /FORM >