即时获取方法表单？

Question

I have input:

<input type="number" pattern="[0-9]*" min="1" max="20" name="kredai" class="form-control" placeholder="Kaina, eurais (privaloma)"></input>

How can I make, that when client fills this input, it would go to

 http://some.web/cost.php?kredai=5

(where 5 is value from input) and shows result from cost.php bellow input?

sorry for my english.

Answer 1

<input type="number" pattern="[0-9]*" min="1" max="20" name="kredai" class="form-control" placeholder="Kaina, eurais (privaloma)" action="cost.php" method="get"></input>

and in the cost.php file:

$kredai = $_GET['kredai'];