在angular 5中迭代一个复杂的JSON结构 [英] iterate a complex JSON structure in angular 5

问题描述

如何在angular 5中迭代JSON?一直在寻找很多管道概念，但是它不适用于复杂的json，如下所示.我需要使用以下类型的数据创建可扩展表，我被困在读取此json的过程中.

how to iterate a JSON in angular 5? Have been searching a lot a got a pipe concept but it does not work with complex json something like below . I need to create expandable table using below type of data, I am stuck in reading this json.

data = [{
"Items" : [ {
  "Key" : "9009",
  "type" : "fsdf",
  "name" : "sdfsdfn",
  "spec" : "dsfsdfdsf",
  "Attributes" : {
    "category" : "Mobile",
    "orderDate" : "2019-03-07 14:40:49.2",
    "startDate" : "2019-03-07 14:40:49.2",
    "status" : "CREATED"
  },
  "characteristics" : [ ],
  "relatedItems" : {
    "contains" : [ "1", "2", "3"]
  },
  "sellable" : false
}, .... {} ]

推荐答案

您可以使用Object.keys获取对象的所有属性.如果要在有角度的模板中使用它，则必须在组件中创建一个包装它的方法.

You can use Object.keys to get all properties of an object. If you want to use it in an angular template, you have to create a method in your component that wraps it.

此处我整理了一个简单的示例，使用模板创建了嵌套表.

Here I hacked together a simple example, using a template to created nested tables.

您会明白的:

//our root app component
import {Component, NgModule, VERSION} from '@angular/core'
import {BrowserModule} from '@angular/platform-browser'

@Component({
  selector: 'my-app',
  template: `
    <ng-template #table let-obj="obj">
      <table style="border: 1px solid black">
        <thead>
          <tr>
            <td *ngFor="let key of getKeys(obj)">
              {{key}}
            </td>
          </tr>
        </thead>
        <tbody>
          <tr>
            <td *ngFor="let value of getValues(obj)">
              <div *ngIf="isValue(value)">
                  {{value}}
              </div>
              <div *ngIf="!isValue(value)">
                <ng-container *ngTemplateOutlet="table;context:ctx(value)"></ng-container>        
              </div>
            </td>
          </tr>
        </tbody>
      </table>
    </ng-template>

    <div *ngFor="let d of data">
      <ng-container *ngTemplateOutlet="table;context:ctx(d)"></ng-container>
    </div>

  `,
})
export class App {
  data:any[];
  constructor() {
    this.data =  [ {
      "Key" : "9009",
      "type" : "fsdf",
      "name" : "sdfsdfn",
      "spec" : "dsfsdfdsf",
      "Attributes" : {
        "category" : "Mobile",
        "orderDate" : "2019-03-07 14:40:49.2",
        "startDate" : "2019-03-07 14:40:49.2",
        "status" : "CREATED"
      },
      "characteristics" : [ ],
      "relatedItems" : {
        "contains" : [ "1", "2", "3"]
      },
      "sellable" : false
    }];
  }
  ctx(obj) {
    return { obj };
  }
  getKeys(obj) {
    return Object.keys(obj);
  }
  getValues(obj) {
    return Object.values(obj);
  }
  isValue(obj) {
    return (obj !== Object(obj));
  }
}

@NgModule({
  imports: [ BrowserModule ],
  declarations: [ App ],
  bootstrap: [ App ]
})
export class AppModule {}

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