CODE EXAMPLE FOR JAVASCRIPT

set twig variable from javascript

//Here is an example

<span id="editSchool" data-url="{{ path('_education_edit', {'id': id}) }}">  
     Edit School
</>

$('#editSchool').click(function () {
        var url = $(this).data('url');

        $('#educationDialog').load(url, function () {
            $('.closeDialog, #person_education_form_cancel').click(function () {
                $('#addSchool').trigger('click');
            });
        });
    });