What are the instructions to prevent bubbling events?

The instructions to prevent bubbling events include stopPropagation(), cancelBubble attribute, event.stopPropagation(), event.cancelBubble attribute, event.stopImmediatePropagation(), etc. Detailed introduction: 1. stopPropagation() is one of the most commonly used instructions, used to stop the propagation of events. When an event is triggered, calling this method can prevent the event from continuing, etc.

Operating system for this tutorial: Windows 10 system, Dell G3 computer.

Bubble events mean that in a web page, when an element triggers an event, the event will bubble up along the element's parent element until it is passed to the root node of the document. The delivery order of bubbling events is starting from the most specific element and going up to the top-most element.

Sometimes, we want to prevent the delivery of bubbling events, that is, only trigger the events of the current element without affecting the events of its parent elements. In JavaScript, we can use some instructions to achieve this purpose. The following are some commonly used instructions to prevent bubbling events:

1. stopPropagation(): This is one of the most commonly used instructions to stop the propagation of events. When an event is triggered, calling this method can prevent the event from bubbling up.

2. cancelBubble attribute: This is a unique attribute of early IE browsers. You can prevent the propagation of events by setting it to true. However, since not all browsers support this attribute, its use is not recommended.

3. event.stopPropagation(): This is a cross-browser compatible method used to prevent the propagation of events. It has the same function as the stopPropagation() method, both of which stop event bubbling delivery.

4. event.cancelBubble property: This is a more compatible property that can prevent the propagation of events by setting it to true. Similar to the cancelBubble property, but it is a standard DOM property that can be used in most modern browsers.

5. event.stopImmediatePropagation(): In addition to stopping the bubbling delivery of events, this method can also prevent the execution of other event listeners of the same type. If there are multiple event listeners of the same type on an element, other listeners will not be executed after calling this method.

In general, the above instructions can be used to prevent the delivery of bubbling events. Which directive to use depends on the compatibility requirements of the browser. It is recommended to choose the appropriate directive according to the specific situation.

It should be noted that although the delivery of bubbling events can be prevented, the default behavior of the event cannot be prevented. If you need to prevent event propagation and default behavior at the same time, you can use the preventDefault() method to achieve this.

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