From the link below
I created the following modal
In the modal I fill in a value and it will update this value in the page form (which will have more fields ...)
Question : How do I do this using just Javascript, JQuery and Ajax?
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Modal</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script><scriptsrc="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>
</head>
</html>
<body>
<!-- Button trigger modal -->
<button type="button" class="btn btn-primary btn-lg" data-toggle="modal" data-target="#myModal">
Atualizar valores
</button>
<div class="container">
<form class="form-horizontal col-sm-2" action="." method="POST">
<div class="form-group">
<label for="id_price">Preço</label>
<input type="text" id="id_price" name="movie" class="form-control">
</div>
<div class="form-group">
<div class="">
<button type="submit" id="id_submit" class="btn btn-primary">Salvar</button>
</div>
</div>
</form>
</div>
<!-- Modal -->
<div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel">
<div class="modal-dialog" role="document">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">×</span></button>
<h4 class="modal-title" id="myModalLabel">Atualizar valores</h4>
</div>
<div class="modal-body">
<input type="text" placeholder="Digite o valor">
</div>
<div class="modal-footer">
<button type="button" class="btn btn-default" data-dismiss="modal">Fechar</button>
<button type="button" class="btn btn-primary">Atualizar</button>
</div>
</div>
</div>
</div>
</body>