form submit event code example
Example 1: form confirm before submit
<form
method="post"
onSubmit="return confirm('Are you sure you wish to delete?');">
...
</form>
Example 2: js form submit listener
document.getElementById("#myFormId").addEventListener("submit", function(e){
if(!isValid){
e.preventDefault(); //stop form from submitting
}
//do whatever an submit the form
});