如何从嵌套json数组中选择

How to select from nested json array

本文关键字：数组 选择 json 嵌套      更新时间：2023-09-26

我有一个JSON我从API作为:

 $scope.data = [{
        "primary": "white",
        "sub": ["white 1", "white 2", "white 3"]
    },{
        "primary": "black",
       "sub": ["black 1", "black 2", "black 3"]
    }];

我想按主和可选值分组数组子

: 

**White**
   white 1
   white 2
   white 3
**Black**
   Black 1
   Black 2
   Black 3

我可以按主键分组，但不能获得内部值。我有:

<div ng-controller="myCtrl">
    <select
        ng-model="myOption"
        ng-options="val.primary group by value.primary for value in data">
    </select>
    <div>
        ng-model value: {{myOption}}
    </div>
</div>

(这是我的小提琴:http://jsfiddle.net/jm6of9bu/648/)

您需要将数组平整化。即使使用group by, ng-options也可以在平面数组上工作:

$scope.data2 = [
    {primary: "white", sub: "white1"},
    {primary: "white", sub: "white2"},
    {primary: "white", sub: "white3"},
    {primary: "black", sub: "black1"},
    {primary: "black", sub: "black2"},
    {primary: "black", sub: "black3"},
    ];

那么你可以这样做:

<select
    ng-model="myOption"
    ng-options="value as value.sub group by value.primary for value in data2">
</select>

模型将被设置为value对象-例如{primary: "white", sub: "white2"}。如果您想将其设置为"white2", "black3"等…然后使用:

ng-options="value.sub as value.sub group by value.primary for value in data2"


var app = angular.module('myApp', []);
app.controller('myCtrl', function($scope) { 
$scope.data = [{
        "primary": "white",
        "sub": ["white 1", "white 2", "white 3"]
    },{
        "primary": "black",
       "sub": ["black 1", "black 2", "black 3"]
    }];
$scope.dataList=[];
$scope.data.forEach(function(value,index){
    value.sub.forEach(function(temp,index){    
    $scope.dataList.push({
      'groupType':value.primary,
      'value':temp
      });
    });    
});
  
  });
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app='myApp' ng-controller="myCtrl">
    <select
        ng-model="myOption"
        ng-options="data.value as data.value group by data.groupType for data in dataList">
    </select>
    <div>
        ng-model value: {{myOption}}
    </div>
</div>

最后我能解决这个小小的调整:

这是我尝试过的

<div ng-controller="myCtrl">
<select ng-model="myOption" ng-options="value.sub group by value.primary for value in data2">

我将嵌套JSON平展为:

function myCtrl($scope) {
   datas = [{
        "primary": "white",
        "sub": ["white 1", "white 2", "white 3"]
    },{
        "primary": "black",
       "sub": ["black 1", "black 2", "black 3"]
    }];
   $scope.data2 = [];
   datas.forEach(function(entry){
     entry.sub.forEach(function(sub){
        $scope.data2.push({primary:entry.primary,sub:sub})
    });
 });
};

这里是小提琴:http://jsfiddle.net/jm6of9bu/658/

我可能不完全明白你想要什么，但是

如果您希望显示子值，则在分组之前将value .primary更改为value .sub 

<div ng-controller="myCtrl">
    <select
        ng-model="myOption"
        ng-options="val.sub group by value.primary for value in datas">
    </select>
    <div>
        ng-model value: {{myOption}}
    </div>
</div>
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