[英]Filtering nested JSON data based on id Angularjs
我检查了这个矮人:矮人: http ://plnkr.co/edit/5E7FYqNNqDuqFBlyDqRh?p=preview
它在某种程度上对我有用。 但是我的问题是我有一个嵌套的json数据。 上面的过滤器代码不起作用的地方。 以下是我根据“ category_id”键进行过滤的json数据。
JSON ::
[{
"category_id": 5,
"category_name": "Home",
"image": "Home_544f75960ee0e",
"parent_id": 0,
"i": 1,
"categories": [
{
"category_id": 7,
"category_name": "Home Safe",
"image": "Home Safe_5411af45ac923",
"parent_id": 5,
"i": 2,
"categories": [
{
"category_id": 13,
"category_name": "Mechanical Safes ",
"image": "Mechanical Safes _540ab92ee1ff7",
"parent_id": 7,
"i": 3
},
{
"category_id": 14,
"category_name": "Electronic Safes ",
"image": "Electronic Safes _540ab93c6e305",
"parent_id": 7,
"i": 4
}
]
},
{
"category_id": 8,
"category_name": "Video Door Phones ",
"image": "Video Door Phones _540ab57a466ff",
"parent_id": 5,
"i": 3
},
{
"category_id": 9,
"category_name": "Alarm Systems ",
"image": "Alarm Systems _540ab58b903e9",
"parent_id": 5,
"i": 4
},
{
"category_id": 10,
"category_name": "Home CCTV Cameras ",
"image": "Home CCTV Cameras _540ab59c59f44",
"parent_id": 5,
"i": 5
},
{
"category_id": 11,
"category_name": "Car Safes ",
"image": "Car Safes _540ab5b0dcc57",
"parent_id": 5,
"i": 6
},
{
"category_id": 12,
"category_name": "Hotel Safes ",
"image": "Hotel Safes _540ab5bddae51",
"parent_id": 5,
"i": 7
}
]},{
"category_id": 6,
"category_name": "Institution",
"image": "Institution_541304aa0a52d",
"parent_id": 0,
"i": 2,
"categories": [
{
"category_id": 15,
"category_name": "Physical Security Products ",
"image": "Physical Security Products _54130515e2cb3",
"parent_id": 6,
"i": 3,
"categories": [
{
"category_id": 18,
"category_name": "Record Protecting Equipment ",
"image": "Record Protecting Equipment _541305cb5f47a",
"parent_id": 15,
"i": 4
},
{
"category_id": 19,
"category_name": "Burglary and Fire Resistant Safes",
"image": "Burglary and Fire Resistant Safes_541305db69acf",
"parent_id": 15,
"i": 5
},
{
"category_id": 20,
"category_name": "Vault Equipment ",
"image": "Vault Equipment _541305e8d905c",
"parent_id": 15,
"i": 6
},
{
"category_id": 21,
"category_name": "Vault Accessories",
"image": "Vault Accessories_541305f6ed3a4",
"parent_id": 15,
"i": 7
}
]
},
{
"category_id": 16,
"category_name": "Premises Security Solutions ",
"image": "Premises Security Solutions _54130525074c9",
"parent_id": 6,
"i": 4
},
{
"category_id": 17,
"category_name": "Marine Solutions ",
"image": "Marine Solutions _54130530a10da",
"parent_id": 6,
"i": 5
}
]}]
在这里,我能够过滤“ category_id” = 5,但不能过滤“ category_id” = 7
@josep以下是我的代码:
var categoriesdata = $filter('filter')($rootScope.catjsondata, {category_id:$stateParams.categoryId})[0];
这里$ rootscope.catjsondata包含嵌套的json数据。 $ stateparams.categoryId将为我提供列表中单击的对象的category_id。 因此,每次ID都会更改。 它没有硬编码。 值是动态的。
以下是我的控制器代码:
.controller('SubCategoriesCtrl', function($scope, $filter, $stateParams, $ionicNavBarDelegate, subcategoriesfactory, globalurlfactory, $rootScope) {
$scope.baseUrl = globalurlfactory;
console.log("$rootScope.catjsondata :: ", $rootScope.catjsondata);
console.log("$stateParams.categoryId :: ", $stateParams.categoryId);
var categoriesdata = $filter('filter')($rootScope.catjsondata, {category_id:$stateParams.categoryId})[0];
console.log("categoriesdata ::::: ", categoriesdata);
//$rootScope.catjsondata = categoriesdata;
$scope.categoryTitle = categoriesdata.category_name;
$scope.categoriesIn = categoriesdata.cats_in;
$scope.categories = categoriesdata.categories;
$scope.has_product = categoriesdata.has_product;
if(categoriesdata.has_product == "yes")
{
$scope.categoryTitle = categoriesdata.category_name;
$scope.products = categoriesdata.product;
}
$scope.goBack = function(){
$scope.isBack = true;
$ionicNavBarDelegate.back();
}})
正如其他提到的那样,由于对此没有内置支持(据我所知),并且您不知道树的深度,因此必须递归(或迭代地,递归更简单)找到它。 这是更新的插件: http ://plnkr.co/edit/sFaBnCnhXzx08pVX5qXe?p=preview
另外,其他键函数也已附加(只是通过表达式查找元素的简单递归):
.filter('recursiveExpression', function($filter) {
return function(input, exp) {
return recursivelyFilterExpression(input, exp);
}
function recursivelyFilterExpression(input, exp) {
var filterResult = $filter('filter')(input, exp);
// Any result?
if (filterResult.length > 0) {
return filterResult[0];
}
if (angular.isArray(input) || angular.isObject(input)) {
for (var key in input) {
if (angular.isArray(input[key]) || angular.isObject(input[key])) {
var internalResult = recursivelyFilterExpression(input[key], exp);
if (internalResult) {
return internalResult;
}
}
}
}
return null;
}
});
**确保表达式的计算成本不高,在这种情况下,这还不够。
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