How to set table heading dynamically in angular 2?

问题

I am getting JSON data and I am storing JSON data on my property.

this.ResultData_search=data.json().extras.ResultData 

this.ResultData=[

  {
        "First_name": "xx",
        "Email": "xxxx",
        "Phone": "xxx",
        "countryCode": "+91",
        "order_datetime": "xxx",
        "status": 11,
        "DeviceType": 3,
        "orderId": "59081a04c9ff6852a49dd32a",
        "orderseqId": "E00002347",
        "orderType": 1,
        "CustomerID": "xx",
        "pickAddress": "xx",
        "dropAddress": "xx",
        "pickLatitude": 17.4369414,
        "dropLatitude": 17.43673,
        "dropLongitude": 78.36710900000003,
        "paymentType": 2,
        "itemDescription": "",
        "receiverName": "uday",
        "receiverPhone": "xx",
        "itemName": "sanjay",
        "deliverycharge": "199",
        "bookingType": 1
      }
      }]

I want to set all keys as table heading and data as table rows. I referred to the below linkshttps://stackoverflow.com/questions/40713580/angular2-table-with-dynamic-rows-and-columns

Link 2:Dynamically loading columns and data in to table in Angular 2

Any plunker will be very helpful to me.

回答1:

The key solution is to convert the Object ResultData into an array of keys. Then you can easily iterate over it. You can get the keys of the object using Object.keys(this.ResultData).

component.ts

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

@Component({
  selector: 'my-app',
  template: `
    <table>
  <thead>
    <tr>
      <td *ngFor=" let key of keys">
        {{key}}
      </td>
    </tr>
  </thead>
  <tbody>
    <tr *ngFor=" let res of ResultData">
      <td *ngFor=" let key of keys">
        {{res[key]}}
      </td>
    </tr>
  </tbody>
</table>
  `,
})
export class App {
  name:string;
  ResultData=[
  {
        "First_name": "xx",
        "Email": "xxxx",
        "Phone": "xxx",
        "countryCode": "+91",
        "order_datetime": "xxx",
        "status": 11,
        "DeviceType": 3,
        "orderId": "59081a04c9ff6852a49dd32a",
        "orderseqId": "E00002347",
        "orderType": 1,
        "CustomerID": "xx",
        "pickAddress": "xx",
        "dropAddress": "xx",
        "pickLatitude": 17.4369414,
        "dropLatitude": 17.43673,
        "dropLongitude": 78.36710900000003,
        "paymentType": 2,
        "itemDescription": "",
        "receiverName": "uday",
        "receiverPhone": "xx",
        "itemName": "sanjay",
        "deliverycharge": "199",
        "bookingType": 1
      } 
      ]
  constructor() {
  }
   keys: string[]=[]; 

  ngOnInit() { 
       this.keys= Object.keys(this.ResultData[0])
  }

}

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

This link has an alternative way of using a pipe to convert a JSON object into an array.

Here is a working plunkr.

Regading the following part :

    <tr *ngFor=" let res of ResultData">
      <td *ngFor=" let key of keys">
        {{res[key]}}
      </td>
    </tr>

ResultData is an array of items. For each item we will create a table row, and we will display the content of each item. That is why we repeat <tr> for each item res in the array ResultData.

Then, for each item res in the ResultData we will iterate over the array of keys we prepared earlier in the ts code. For each item key in the keys we will display the value of item as {{res[key]}}.

来源：https://stackoverflow.com/questions/43864288/how-to-set-table-heading-dynamically-in-angular-2