$(document).ready(function() {
    $('form').on('submit', function(event) {
        event.preventDefault();

        var operandA = $('input[name="operandA"]').val();
        var operandB = $('input[name="operandB"]').val();

        $.ajax({
            type: 'POST',
            url: 'http://webex.sdi.hevs.ch/calc',
            data: { operandA: operandA, operandB: operandB },
            success: function(data) {
                var result = $(data).find('strong').text();
                $('input[name="result"]').val(result);
            }
        });
    });
});