Common event examples supported by event bubbling

Event bubbling means that in the DOM, when an element triggers an event, the event will be triggered step by step from that element to upper elements until the root element is triggered or stops. bubble. During this process, both parent elements and ancestor elements have the opportunity to capture and handle the triggered events. This article will use examples to analyze which common events support event bubbling.

1. Click event (click)
   Click event is one of the most common events. When the mouse clicks on an element, the click event will not only be triggered on the element, but also the click events on the parent element and ancestor elements will be triggered in turn. For example, if you click the mouse on a button, not only the click event of the button will be triggered, but also the click event of the div containing the button, and the click event of the body element containing the div.
2. Mouse move event (mousemove)
   Mouse move event also supports event bubbling. When the mouse moves on the page, the mousemove event will be triggered from the element at the current mouse position and bubble up to the root element. This means that if you move the mouse in a container that contains multiple divs, the move event will fire on each div.
3. Hover event (mouseenter)
   Hover event is triggered when the mouse enters the element, and also supports event bubbling. If you use the mouseenter event to bind to a div, when the mouse enters the div, the event will bubble up to its parent element, ancestor elements, and up to the root element. This means that if you enter the area of ​​a child div within a nested div element, both the child div and the parent div will trigger the mouseenter event.
4. Focus event (focus)
   Focus event refers to an event triggered when the user selects (focuses) an element. When an input box is focused, the focus event will bubble up from the input box to the div, body element, and even the root element containing the input box. This allows us to take advantage of the event bubbling feature to easily implement some focus-related logical operations.
5. Keyboard events (keydown, keyup)
   Keyboard events refer to events that are triggered when the user presses or releases a key on the keyboard. Although keyboard events are not commonly used in event bubbling, in some specific scenarios, the bubbling effect can be used to handle key events. For example, if you press a key in a form with multiple inputs, the keydown event will bubble up from the current input element to the top-level elements of the entire form.

To summarize, common events that support event bubbling include click events, mouse movement events, hover events, focus events and keyboard events. By understanding the bubbling characteristics of these events, we can better understand the propagation mechanism of events in the DOM and flexibly apply it in actual development.

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