javascript - AngularJS 和 JSON 数组

Question

我正在尝试使用 AngularJS 过滤器(例如 $filter)按如下所示安排现有的 JSON 数组，但它失败了。

 {
        {       
            name: "name 1",         
            label: "A",     
        },
        {       
            name: "name 2",         
            label: "A",     
        },
        {       
            name: "name 3",         
            label: "B",     
        },
        {       
            name: "name 4",         
            label: "B",     
        },
        {       
            name: "name 5",         
            label: "B",     
        },
        {       
            name: "name 6",         
            label: "C",     
        },
        {       
            name: "name 7",         
            label: "C",     
        },
        {       
            name: "name 8",         
            label: "C",     
        },
        {       
            name: "name 9",         
            label: "D",     
        }
    }

我想要的是将这个数组安排到下面的新数组中。

{
    "A" : { 
        {       
            name: "name 1",         
            label: "A",     
        },
        {       
            name: "name 2",         
            label: "A",     
        },
    },
    "B" : {
        {       
            name: "name 3",         
            label: "B",     
        },
        {       
            name: "name 4",         
            label: "B",     
        },
        {       
            name: "name 5",         
            label: "B",     
        },
    },
    "C" : {
        {       
            name: "name 6",         
            label: "C",     
        },
        {       
            name: "name 7",         
            label: "C",     
        },
        {       
            name: "name 8",         
            label: "C",     
        },
    },
    "D" : {
        {       
            name: "name 9",         
            label: "D",
        }
    }   
}

如何使用 angularJS 获取新数组？

Answer 1

如果您使用的是 lodash ，您可以为此使用 _.groupBy 函数:

var grouppedArray = _.groupBy(myArray, function(i){
  return i.label;
})

要仅提取标签，您可以像这样

var uniqueLables = [];
angular.forEach(myArray, function(obj){
  if(uniqueLables.indexOf(obj.label) == -1) uniqueLables.push(obj.label)
})