Angular2事件是什么Typescript类型

如果我在html文件中有以下按钮

<button (click)="doSomething('testing', $event)">Do something</button>

另外，在相应的组件中，我具有此功能

doSomething(testString: string, event){
    event.stopPropagation();
    console.log(testString + ': I am doing something');
}

是否应该为$event输入分配适当的类型？事件参数本身是一个对象，但是如果我将其分配给类型对象，则会收到错误消息

类型对象不存在属性“ stopPropogation”

那么，Typescript考虑$event输入什么呢？

正如@AlexJ建议的那样

您传递的事件$event是DOM事件，因此可以使用EventName作为类型。

在您的情况下，此事件为MouseEvent，而文档说：

所述的MouseEvent接口表示用户利用指示设备（如鼠标）的交互的发生是由于事件。使用此界面的常见事件包括click，dblclick，mouseup，mousedown。

在所有这些情况下，您都会得到一个MouseEvent。

另一个例子：如果您有此代码

<input type="text" (blur)="event($event)"

事件触发时，您会收到一个FocusEvent。

因此，您可以非常简单地完成操作，控制台记录事件，您将看到一条类似于该消息的消息，我们将获得事件名称

FocusEvent {isTrusted: true, relatedTarget: null, view: Window, detail: 0, which: 0…}

您可以随时访问文档以获取现有活动的列表。

编辑

您还可以检查dom.generated.d.ts带有所有类型输入的TypeScript 。您的情况stopPropagation()是的一部分Event，由扩展MouseEvent。

一些常用事件及其相关名称（MouseEvent，FocusEvent，TouchEvent，DragEvent，KeyboardEvent）：

| MouseEvent | FocusEvent |  TouchEvent | DragEvent | KeyboardEvent |
|:----------:|:----------:|:-----------:|:---------:|:-------------:|
|    click   |    focus   |  touchstart |    drag   |    keypress   |
|   mouseup  |    blur    |  touchmove  |    drop   |     keyup     |
| mouseleave |   focusin  | touchcancel |  dragend  |    keydown    |
|  mouseover |  focusout  |   touchend  |  dragover |               |

通用事件与：

• 关
• 更改
• 无效
• 玩
• 重启
• 滚动
• 选择
• 提交
• 拨动
• 等候

如果您在Typescript的存储库中进行挖掘，则dom.generation.d.ts提供了一个全局事件接口（信贷转到Eric的答案），您可以在第5725行找到所有事件处理程序的映射：

interface GlobalEventHandlersEventMap {
  "abort": UIEvent;
  "animationcancel": AnimationEvent;
  "animationend": AnimationEvent;
  "animationiteration": AnimationEvent;
  "animationstart": AnimationEvent;
  "auxclick": MouseEvent;
  "blur": FocusEvent;
  "cancel": Event;
  "canplay": Event;
  "canplaythrough": Event;
  "change": Event;
  "click": MouseEvent;
  "close": Event;
  "contextmenu": MouseEvent;
  "cuechange": Event;
  "dblclick": MouseEvent;
  "drag": DragEvent;
  "dragend": DragEvent;
  "dragenter": DragEvent;
  "dragexit": Event;
  "dragleave": DragEvent;
  "dragover": DragEvent;
  "dragstart": DragEvent;
  "drop": DragEvent;
  "durationchange": Event;
  "emptied": Event;
  "ended": Event;
  "error": ErrorEvent;
  "focus": FocusEvent;
  "focusin": FocusEvent;
  "focusout": FocusEvent;
  "gotpointercapture": PointerEvent;
  "input": Event;
  "invalid": Event;
  "keydown": KeyboardEvent;
  "keypress": KeyboardEvent;
  "keyup": KeyboardEvent;
  "load": Event;
  "loadeddata": Event;
  "loadedmetadata": Event;
  "loadend": ProgressEvent;
  "loadstart": Event;
  "lostpointercapture": PointerEvent;
  "mousedown": MouseEvent;
  "mouseenter": MouseEvent;
  "mouseleave": MouseEvent;
  "mousemove": MouseEvent;
  "mouseout": MouseEvent;
  "mouseover": MouseEvent;
  "mouseup": MouseEvent;
  "pause": Event;
  "play": Event;
  "playing": Event;
  "pointercancel": PointerEvent;
  "pointerdown": PointerEvent;
  "pointerenter": PointerEvent;
  "pointerleave": PointerEvent;
  "pointermove": PointerEvent;
  "pointerout": PointerEvent;
  "pointerover": PointerEvent;
  "pointerup": PointerEvent;
  "progress": ProgressEvent;
  "ratechange": Event;
  "reset": Event;
  "resize": UIEvent;
  "scroll": Event;
  "securitypolicyviolation": SecurityPolicyViolationEvent;
  "seeked": Event;
  "seeking": Event;
  "select": Event;
  "selectionchange": Event;
  "selectstart": Event;
  "stalled": Event;
  "submit": Event;
  "suspend": Event;
  "timeupdate": Event;
  "toggle": Event;
  "touchcancel": TouchEvent;
  "touchend": TouchEvent;
  "touchmove": TouchEvent;
  "touchstart": TouchEvent;
  "transitioncancel": TransitionEvent;
  "transitionend": TransitionEvent;
  "transitionrun": TransitionEvent;
  "transitionstart": TransitionEvent;
  "volumechange": Event;
  "waiting": Event;
  "wheel": WheelEvent;
}

根据Officialevent的类型Object，在我的情况下，当我将类型转换event为Object时，它也不会抛出任何错误，但是在阅读了angular2的文档后，您发现event的类型是类型，EventEmitter因此您可以将caste输入事件EventEmitter

看到这里是同一个http://plnkr.co/edit/8HRA3bM0NxXrzBAjWYXc?p=preview的plunkr

有关更多信息，请参见此处https://angular.io/docs/ts/latest/guide/template-syntax.html#!#event-binding