function pagePresets() {
    this.loading = true;
    this.isLoading = function () {
        return this.loading;
    };
    this.setLoading = function (state) {
        this.loading = state;
        return;
    };
    /** this function loads saved filters */
    this._loadFilters = function() {
        jQuery.ajax({
            type: 'post',
            dataType: "json",
            url: 'data.json',
            success: function (data) {
                //HOW TO CALL setFilter?
                pagePresets.prototype.setFilter.call('network', data.networks);
            }
        });
    };
}

pagePresets.prototype.setFilter = function (target, value) {
 console.info(target + ' ' + value );
}