Laravel redirect with javascript

I have a form where a user can select a number ranging from 2 to 10. Based on the selected number I'd like to redirect to '/mypage?number=[2..10]' like the way Laravel's redirect() function does. Thus, flashing the old input values to fill the form accordingly. Based on the $_GET['number'] parameter a for-loop is executed printing 2 to 10 input fields.

How can this be done in the most efficient (and meant to be) way? Or do I have to set up a new route like Route::post('mypage/{number}', 'myController@redirectMethod')?

via Chebli Mohamed