Angular 自定义过滤器未更新 ng-repeat

Angular custom filter not updating ng-repeat

这里有很多关于 ng-repeat 和自定义过滤器的问题,但是 none 解决了我面临的问题。

拿这个:

<div class="row" ng-repeat="row in rows | chunk:columns">

    <!-- Now loop over the row chunk to output the column -->
    <div 
        ng-class="{'col-xs-12':row.length<=1,'col-xs-6':row.length>1"
        ng-repeat="item in row"
    >
        {{ item.name }}
    </div>
</div>

过滤器 chunk 是我为 return 一大块 $scope.rows 创建的自定义过滤器,它是一个对象数组。

在我更改 $scope.columns 的值之前,它工作正常。此时我希望 ng-repeat 指令将自身添加到摘要循环中以重新绘制,但它没有。

$scope.columns 的值发生变化时,如何重新绘制它?

根据评论,块过滤器是:

var _ = require('lodash');

/**
 * Chunk an array into pieces
 * @param collection
 * @param chunkSize
 * @returns {array}
 */
var chunk = function (collection, chunkSize) 
{
    if (!collection || _.isNaN(parseInt(chunkSize, 10))) 
    { 
        return [];
    }

    return _.toArray(
        _.groupBy(collection, function (iterator, index) 
        {
            return Math.floor(index / parseInt(chunkSize, 10));
        })
    );
}

/**
 * Angular filter to cache array chunks and return
 * x number of chunks from an array via a filter.
 *
 * @example
 * <div ng-repeat="item in items | chunk:2"> ... </div>
 * @returns {array}
 */
module.exports = function()
{
    return _.memoize(chunk);

    // If I console.log(_.memoize(chunk)()) here I get the output
    // from the first digest only.
};

$scope.columns 正在由指令更新

/**
 * toggleGridView directive
 * @returns {object}
 */
module.exports = ['localStorageService', function(localStorageService)
{
    return {
        replace : true,
        template: '<button type="button" ng-click="toggleView()"></button>',
        link : function(scope, el, attr) {
            scope.gridView = localStorageService.get('itemlistgrid') == "true";

            scope.columns = scope.gridView ? 2 : 1;

            scope.toggleView = function() 
            {
                localStorageService.set(
                    'itemlistgrid', 
                    scope.gridView = ! scope.gridView
                );

                scope.columns = scope.gridView ? 2 : 1;
            }
        }
    }
}];

控制器在指令范围内,因此我可以看到列正在输出正确的值。如果我观看 columns 我可以看到它在更新时发生变化。

我删除了过滤器中缓存的需要,并将逻辑移到了控制器中,正如其他一些关于类似问题的答案中所建议的那样。

/**
 * Angular filter to cache array chunks and return
 * x number of chunks from an array via a filter.
 *
 * @example
 * <div ng-repeat="item in items | chunk:2"> ... </div>
 * @returns {array}
 */
module.exports = function()
{
    // Removed the _.memoize caching
    return chunk;
};

这阻止了过滤器直接在视图中工作,因为它在每次迭代时调用过滤器修改整个数据集,导致摘要循环中的破坏。

我把它拆下来直接放在控制器里了

// Created items as a private variable in the controller
var items = [];

// Watch for changes to gridView and call toggleGrid
$scope.$watch('gridView', toggleGrid);

function toggleGrid(flag)
{
    $scope.rows = $filter('chunk')(items, flag ? 2 : 1);
}

// With a restful resource success callback set the initial state
ItemsResource.index({}, function(data)
{
    // Set the private data to the collection of models 
    items = data.body.models;

    // Toggle the grid using the initial state of $scope.gridView
    toggleGrid($scope.gridView);
}