chore(demo): show static text on preview for ajax callback

demo/package.json

@@ -1,6 +1,6 @@
 {
   "name": "angular-datatables-demo",
-  "version": "16.0.0",
+  "version": "17.0.1",
   "license": "MIT",
   "scripts": {
     "ng": "ng",

demo/src/app/basic/with-ajax-callback/with-ajax-callback.component.html

@@ -1,5 +1,7 @@
 <ng-template #preview>
-  <table datatable [dtOptions]="dtOptions" class="row-border hover"></table>
+  <blockquote>
+    <p>No preview as we do not have a server that can serve the queries.</p>
+  </blockquote>
 </ng-template>
 <app-base-demo [pageTitle]="pageTitle" [mdIntro]="mdIntro" [mdHTML]="mdHTML" [mdTS]="mdTS" [template]="preview">
 </app-base-demo>

demo/src/app/basic/with-ajax-callback/with-ajax-callback.component.spec.ts

@@ -1,7 +1,6 @@
 import { HttpClientModule } from '@angular/common/http';
 import { SecurityContext, NO_ERRORS_SCHEMA } from '@angular/core';
 import { ComponentFixture, TestBed, waitForAsync } from '@angular/core/testing';
-import { By } from '@angular/platform-browser';
 import { RouterTestingModule } from '@angular/router/testing';
 import { DataTableDirective, DataTablesModule } from 'angular-datatables';
 import { AppRoutingModule } from 'app/app.routing';
@@ -50,15 +49,4 @@ describe('WithAjaxCallbackComponent', () => {
     expect(app.pageTitle).toBe('AJAX with callback');
   }));
 
-  it('should have table populated via AJAX', async () => {
-    const app = fixture.debugElement.componentInstance as WithAjaxCallbackComponent;
-    await fixture.whenStable();
-    expect(app.dtOptions.columns).toBeDefined();
-    const query = fixture.debugElement.query(By.directive(DataTableDirective));
-    const dir = query.injector.get(DataTableDirective);
-    expect(dir).toBeTruthy();
-    const instance = await dir.dtInstance;
-    fixture.detectChanges();
-    expect(instance.rows().length).toBeGreaterThan(0);
-  });
 });

demo/src/app/basic/with-ajax-callback/with-ajax-callback.component.ts

@@ -1,6 +1,5 @@
 import { HttpClient } from '@angular/common/http';
 import { Component, OnInit } from '@angular/core';
-import { DataTablesResponse } from 'app/datatables-response.model';
 
 @Component({
   selector: 'app-with-ajax-callback',
@@ -22,19 +21,6 @@ export class WithAjaxCallbackComponent implements OnInit {
   ngOnInit(): void {
     const that = this;
     this.dtOptions = {
-      ajax: (dataTablesParameters: any, callback) => {
-        that.http
-          .post<DataTablesResponse>(
-            'https://xtlncifojk.eu07.qoddiapp.com/',
-            dataTablesParameters, {}
-          ).subscribe(resp => {
-            callback({
-              recordsTotal: resp.recordsTotal,
-              recordsFiltered: resp.recordsFiltered,
-              data: resp.data
-            });
-          });
-      },
       columns: [{
         title: 'ID',
         data: 'id'