Ag-Grid 动态设置列和行数据

Question

I have a TypeScript class where I call a method that calls a back-end api to get data from the server to put into a grid. At the moment I have hard-coded columns and rows just to test how I will do this. When I put the column and row setting code as in the example below I get the grid correctly populated.

export class FooComponent {
  private columnDefs = [];
  private rowData = [];
  private gridOptions: GridOptions;
  private data: any;

  constructor(private http:HttpClient ) { 
    this.getFoo();

this.gridOptions = <GridOptions>{};
          this.gridOptions.columnDefs = [
            {headerName: 'Make', field: 'make' },
            {headerName: 'Model', field: 'model' },
            {headerName: 'Price', field: 'price'}
          ];
          this.gridOptions.rowData = [
            { make: 'Toyota', model: 'Celica', price: 35000 },
            { make: 'Ford', model: 'Mondeo', price: 32000 },
            { make: 'Porsche', model: 'Boxter', price: 72000 }
          ];
  }

  getFoo(){
    this.http.get(`https://xxx`).subscribe(response => {
      this.data = response;
    }, error => {
      console.log(error);
    });
  }

But when I put the column and row setting code inside the getFoo method, which is where I want it, my grid's data does not get set and I get a loading box.

export class FooComponent {
  private columnDefs = [];
  private rowData = [];
  private gridOptions: GridOptions;
  private data: any;

  constructor(private http:HttpClient ) { 
    this.getFoo();
  }

  getFoo(){
    this.http.get(`https://xxx`).subscribe(response => {
      this.data = response;

      this.gridOptions = <GridOptions>{};
          this.gridOptions.columnDefs = [
            {headerName: 'Make', field: 'make' },
            {headerName: 'Model', field: 'model' },
            {headerName: 'Price', field: 'price'}
          ];
          this.gridOptions.rowData = [
            { make: 'Toyota', model: 'Celica', price: 35000 },
            { make: 'Ford', model: 'Mondeo', price: 32000 },
            { make: 'Porsche', model: 'Boxter', price: 72000 }
          ];
    }, error => {
      console.log(error);
    });
  }

I tried to resolve this by returning a promise from getFoo and then setting the column and row data inside the 'then' of the promise but got the same loading box.

Here is my markup.

<ag-grid-angular 
    style="width: 700px; height: 500px;" 
    class="ag-theme-balham"
    [gridOptions]="gridOptions"
    >
</ag-grid-angular>

Any ideas?

Answer 1

You can do it like this:

  export class FooComponent {
  private columnDefs = [];
  private rowData = [];
  private gridOptions$: Observable<GridOptions>;

  constructor(private http:HttpClient ) { 
 }
 ngOnInit() { this.getFoo(); } // call it here, not in constructor

 getFoo(){ 
   this.gridOptions$ = this.http.get(`https://xxx`);
 }

You can transform the http request by doing.map on it and do your business logic, and that response will be observable.

After that just in html call it like this:

<ag-grid-angular 
style="width: 700px; height: 500px;" 
class="ag-theme-balham"
[gridOptions]="gridOptions$ | async"
>

This will asynchronously update the model and trigger change detection for you.