I am trying to get a ag-grid datasource to work in angular2, although I got the feeling that I am nearly there I am not able to fix the following issue with my current knowledge of angular/typescript.
The problem is that I have a function called returnRows, which works perfectly fine (see testdata variable). But the moment I try to call it within datasource.getRows I get the following exception: TypeError: this.returnRows is not a function in [gridOptions in PagetestComponent@2:2]. In the end I would like to replace the function with a service that gets the data from an api.
Here is my component.ts code:
import {Component, OnInit} from 'angular2/core';
import {RouteParams} from 'angular2/router';
import {AgGridNg2} from 'ag-grid-ng2/main';
import {GridOptions} from 'ag-grid/main';
import {PagetestService} from '..//services/pagetest.service';
@Component({
selector: 'sample',
templateUrl:'/static/app/pagetest/components/pagetest.component.html',
directives: [AgGridNg2],
providers: [PagetestService]
})
export class PagetestComponent implements OnInit{
public gridOptions: GridOptions;
private columnDefs: any[];
private testdata: any[];
constructor(
public _routeParams: RouteParams,
public _variantsService: PagetestService) {
}
ngOnInit(){
this.columnDefs = [
{headerName: "ID", field: "_id",},
{headerName: "CHR", field: "chr"},
{headerName: "POS", field: "pos"},
{headerName: "REF", field: "ref"},
{headerName: "ALT", field: "alt"},
];
this.gridOptions = <GridOptions>{};
this.gridOptions.datasource = this.dataSource;
this.testdata = this.returnRows();
}
dataSource = {
//rowCount : -1,
pageSize: 1,
overflowSize: 100,
getRows: function(params: any){
console.log(params)
//var rowData = [
//{"chr": "1", "_id": "1-22848972-A-C", "ref": "A", "pos": 22848972, "alt": "C"},
//{"chr": "1", "_id": "1-33133968-T-C", "ref": "T", "pos": 33133968, "alt": "C"}
//]
rowData = this.returnRows();
var rowsThisPage = rowData.slice(params.startRow, params.endRow);
console.log(rowsThisPage)
var lastRow = -1;
params.successCallback(rowsThisPage, lastRow);
}
}
returnRows(){
var rowData = [
{"chr": "1", "_id": "1-22848972-A-C", "ref": "A", "pos": 22848972, "alt": "C"},
{"chr": "1", "_id": "1-33133968-T-C", "ref": "T", "pos": 33133968, "alt": "C"}
]
return rowData
}
}
Update, thanks @Dinistro for answering my initial question.
Updated code (partial):
getRows: (params: any) => {
var rowData = this.returnRows();
var rowsThisPage = rowData.slice(params.startRow, params.endRow);
var lastRow = -1;
//if (rowData.length <= params.endRow) {
//lastRow = rowData.length;
//}
// call the success callback
params.successCallback(rowsThisPage, lastRow);
}
And added service to returnRows function.
returnRows() {
var rowData: any;
this._variantsService.getVariants().subscribe(
variants => rowData = variants
);
console.log(rowData)
return rowData;
}
This how ever results now in the error: TypeError: rowData is undefined in [gridOptions in PagetestComponent@2:2]. Probably a similar mistake but I can't get it to work.
pagetest.component.html
<h1>Pagetest</h1>
<ag-grid-ng2 #agGrid style="width: 100%; height: 350px;" class="ag-fresh"
[gridOptions]="gridOptions"
[columnDefs]="columnDefs"
rowModelType = "pagination"
enableColResize>
</ag-grid-ng2>
pagetest.service.ts
import {Injectable} from 'angular2/core';
import {Http, Response} from 'angular2/http';
import {Observable} from 'rxjs/Observable';
@Injectable()
export class PagetestService {
constructor (private http: Http) {}
private _variantsUrl = '/api/variant/'; // URL to web api
getVariants () {
return this.http.get(this._variantsUrl)
.map(res => res.json())
.catch(this.handleError);
}
private handleError (error: Response) {
console.error(error);
return Observable.throw(error.json().error || 'Server error');
}
}
Simply use an arrow-function:
getRows: (params: any) => {
console.log(params)
//var rowData = [
//{"chr": "1", "_id": "1-22848972-A-C", "ref": "A", "pos": 22848972, "alt": "C"},
//{"chr": "1", "_id": "1-33133968-T-C", "ref": "T", "pos": 33133968, "alt": "C"}
//]
rowData = this.returnRows();
var rowsThisPage = rowData.slice(params.startRow, params.endRow);
console.log(rowsThisPage)
var lastRow = -1;
params.successCallback(rowsThisPage, lastRow);
}
This will make sure, that the "this-context" is not changed
For the updated question
I see your error: You need to return the Observable, because otherwise, the rowData
will not be loaded:
returnRows() {
return this._variantsService.getVariants();
}
And then use it like this:
getRows: (params: any) => {
this.returnRows().subscribe(rowData => {
var rowsThisPage = rowData.slice(params.startRow, params.endRow);
var lastRow = -1;
//if (rowData.length <= params.endRow) {
//lastRow = rowData.length;
//}
// call the success callback
params.successCallback(rowsThisPage, lastRow);
});
}
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