Question

我正在尝试实现离子过滤器条，以便在我的离子移动应用程序上使用typeahead工作，并且在尝试确定控制器中的$ scope时遇到问题。我一直在复制这里的演示应用程序中的大部分代码：

https://github.com/djett41/ionic-filter-bar/blob/master/demo/app/scripts/app.js

我可以确定$ scope.hops，以便在页面上正确呈现的ng-repeat中正确显示所有对象（无需搜索），但我无法在showFilterBar函数中引用$ scope.hops。输出到console.log时我收到undefined（请参阅代码中的注释）。我认为这与在其他函数中访问$ scope的方式有关（??）但是卡住了。

任何人都可以帮我一把吗？提前谢谢。

控制器

//Added $ionicFilterBar & $timeout - Remove if does not work
.controller("hopsListCtrl", function($scope, hopsService, $stateParams, $state, $ionicFilterBar, $timeout) {

    hopsService.getHops().then(function(hops) {

        //This correctly returns my object of hop varieties
        $scope.hops = hops;


    })


    $scope.onSelectHopsDetail = function(hops_detail) {

        $state.go('tab.hopsDetail', hops_detail);

        hopsService.postHopDetails(hops_detail);



    };

    var filterBarInstance;

    //This returns "undefined" -
    console.log($scope.hops);

    $scope.showFilterBar = function() {
        filterBarInstance = $ionicFilterBar.show({

            hops: $scope.hops,
            update: function(filteredItems) {
                $scope.hops = filteredItems;

                //This returns "undefined"
                console.log(filteredItems);
            },
            filterProperties: 'Name'
        });
    };

    $scope.refreshItems = function() {
        if (filterBarInstance) {
            filterBarInstance();
            filterBarInstance = null;
        }

        $timeout(function() {
            getItems();
            $scope.$broadcast('scroll.refreshComplete');
        }, 1000);
    };


})

Hops列表页面

<ion-view title="Hops Guide">
    <ion-nav-buttons side="secondary">
        <button class="button-icon icon ion-ios-search" ng-click="showFilterBar()">
        </button>
    </ion-nav-buttons>

    <ion-content direction="y" scrollbar-y="false">

        <ion-refresher pulling-icon="ion-arrow-down-b" on-refresh="refreshItems()">
        </ion-refresher>

        <ion-list>
            <ion-item collection-repeat="hop in hops">
                <a class="" ng-click="onSelectHopsDetail(hop)">
                    <p>{{hop.Name}}</p>
            </ion-item>
        </ion-list>

        <div ng-if="hops !== undefined && !hops.length" class="no-results">
            <p>No Results</p>
        </div>

    </ion-content>
</ion-view>

Answer 1

您需要使用items属性而不是跳转到过滤器栏服务。所以你对showFilterBare的调用应该是

filterBarInstance = $ionicFilterBar.show({

        items: $scope.hops,
        update: function(filteredItems) {
            $scope.hops = filteredItems;

            //This returns "undefined"
            console.log(filteredItems);
        },
        filterProperties: 'Name'
    });

Answer 2

在成功解决承诺（即异步）时，您正在设置$scope.hops。基本上，您在承诺解决之前执行了console.log，并且范围没有跳跃。关于网上承诺的信息基调。我个人喜欢这样的解释：https://stackoverflow.com/a/15738351/3927379

Answer 3

替换

filterBarInstance = $ionicFilterBar.show({

    items: $scope.hops,
    update: function(filteredItems) {
        $scope.hops = filteredItems;

        //This returns "undefined"
        console.log(filteredItems);
    },
    filterProperties: 'Name'
});

与

filterBarInstance = $ionicFilterBar.show({

    items: $scope.hops,
    update: function(filteredItems, filterText) {
        $scope.hops = filteredItems;

        //This returns "undefined"
        console.log(filteredItems);
    },
    filterProperties: 'Name'
});

具有离子过滤条的离子预先输入 - 无法参考$ scope

3 个答案: