 removeField (i, j) {
                document.getElementById("cond_" + i).removeChild(document.getElementById("additional-field_" + i + "_" + j));
            }

            function addCondition () {
                var parent = document.getElementById("conds");
                var div = document.createElement("div");
                div.className = "cond";
                div.id = "cond_" + added_fields.length;
                div.innerHTML = "<div>Colonne : <select name=\"column_name\" \
               