client/src/app/shared/rest/rest-data-source.ts

   1 import { Http, RequestOptionsArgs, URLSearchParams, Response } from '@angular/http'
   2
   3 import { ServerDataSource } from 'ng2-smart-table'
   4
   5 export class RestDataSource extends ServerDataSource {
   6   private updateResponse: (input: any[]) => any[]
   7
   8   constructor (http: Http, endpoint: string, updateResponse?: (input: any[]) => any[]) {
   9     const options = {
  10       endPoint: endpoint,
  11       sortFieldKey: 'sort',
  12       dataKey: 'data'
  13     }
  14     super(http, options)
  15
  16     if (updateResponse) {
  17       this.updateResponse = updateResponse
  18     }
  19   }
  20
  21   protected extractDataFromResponse (res: Response) {
  22     const json = res.json()
  23     if (!json) return []
  24     let data = json.data
  25
  26     if (this.updateResponse !== undefined) {
  27       data = this.updateResponse(data)
  28     }
  29
  30     return data
  31   }
  32
  33   protected extractTotalFromResponse (res: Response) {
  34     const rawData = res.json()
  35     return rawData ? parseInt(rawData.total, 10) : 0
  36   }
  37
  38   protected addSortRequestOptions (requestOptions: RequestOptionsArgs) {
  39     const searchParams = requestOptions.params as URLSearchParams
  40
  41     if (this.sortConf) {
  42       this.sortConf.forEach((fieldConf) => {
  43         const sortPrefix = fieldConf.direction === 'desc' ? '-' : ''
  44
  45         searchParams.set(this.conf.sortFieldKey, sortPrefix + fieldConf.field)
  46       })
  47     }
  48
  49     return requestOptions
  50   }
  51
  52   protected addPagerRequestOptions (requestOptions: RequestOptionsArgs) {
  53     const searchParams = requestOptions.params as URLSearchParams
  54
  55     if (this.pagingConf && this.pagingConf['page'] && this.pagingConf['perPage']) {
  56       const perPage = this.pagingConf['perPage']
  57       const page = this.pagingConf['page']
  58
  59       const start = (page - 1) * perPage
  60       const count = perPage
  61
  62       searchParams.set('start', start.toString())
  63       searchParams.set('count', count.toString())
  64     }
  65
  66     return requestOptions
  67   }
  68 }