Display message that hide itself after certain interval or after user say’s to hide it. Released it for beginners.

learn how to submit form and handle error and success. Important is how to avoid resubmitting of form.

how to display message after form submit or any action taken after user interaction?

In case you want your form action value changed based on certain condition then you can do this using simple JavaScript. In this way you can submit your single form to any of your scripts based on condition.
Here you will also find tricks for changing the method attribute of the form using JavaScript.
<script type=”text/javascript”>

function changeAction [...]

This is the general problem fresher struck in form submission. They struck in some logical problem and try to find their solution in submitting two forms in a web page at same time.
But answer to this question is simple. You cannot do this in general.
You can change action attribute’s value based on some condition. You [...]

It is very familiar select all – deselect all check box. It is using plain javascript code. and not using any library like jquery