使用 IntraWeb (34) - TIWAJAXNotifier

在异步事件中, 可以通过 TIWAJAXNotifier 发出一个通知(通过其 Notify 方法), 该通知会激发其 OnNotify 事件.

这一般用在: 当一个异步事件完成后, 立即处理随后的事情.

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TIWAJAXNotifier 所在单元及继承链:
IWCompExtCtrls.TIWAJAXNotifier < TIWBaseHTML40Component < TIWBaseHTMLComponent < TIWBaseComponent < TComponent < TPersistent < TObject

主要成员:

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property SendNotification: Boolean
property OnNotify: TNotifyEvent

procedure Notify

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测试(需要 1 个 IWButton、4 个 IWLabel、3 个 IWAJAXNotifier):

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{确保这是异步事件}
procedure TIWForm1.IWButton1AsyncClick(Sender: TObject; EventParams: TStringList);
begin
  IWLabel1.Caption := TimeToStr(Time);
  IWAJAXNotifier1.Notify; //OnAsyncClick 执行到最后, 让 IWAJAXNotifier1 发出通知
end;

{IWAJAXNotifier1.OnNotify}
procedure TIWForm1.IWAJAXNotifier1Notify(Sender: TObject);
begin
  Sleep(1000);
  IWLabel2.Caption := TimeToStr(Time);
  IWAJAXNotifier2.Notify; //继续让 IWAJAXNotifier2 发出通知
end;

{IWAJAXNotifier2.OnNotify}
procedure TIWForm1.IWAJAXNotifier2Notify(Sender: TObject);
begin
  Sleep(1000);
  IWLabel3.Caption := TimeToStr(Time);
  IWAJAXNotifier3.Notify; //继续让 IWAJAXNotifier3 发出通知
end;

{IWAJAXNotifier3.OnNotify}
procedure TIWForm1.IWAJAXNotifier3Notify(Sender: TObject);
begin
  Sleep(1000);
  IWLabel4.Caption := TimeToStr(Time);
end;

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