Window Modal does not work

Hello.

I'm setting up a CRUD. At the end of some routines, INSERT, EDIT etc I want you to either show a success message or not. I thought about using MODAL BOOTSTRAP.
1- I have already inserted all the .js files in the header.htmk file
2- I already put jquery.min.js before bootstrap.min.js
3- I also inserted bootstrap-modal.js
4- I already inserted this code, at the end and at the beginning of the screen that I want to show the MODAL:
<script type = "text / javascript">
     $ (window) .load (function () {$ ('# myModal'). modal ('show');
      });
</ script>
5- I have already put this code instead of the code above:

$ (document) .ready (function () {
   $ ('# myModal'). modal ('show');
});
 In the model I do the INSERTS, UPDATES and DELETES, and after that I call a view to give a message. I was using a very beginner model:
<div class = "alert alert-success" role = "alert">
<? php $ msg; ?>
</ div>
And I decided to try the MODAL.
But it does not work.