What does event capture do?

Click events in JavaScript cannot be executed repeatedly because of the event bubbling mechanism. To solve this problem, you can take the following measures: Use event capture: Specify an event listener to fire before the event bubbles up. Handing over events: Use event.stopPropagation() to stop event bubbling. Use a timer: trigger the event listener again after some time.

The functions of event capture include conveniently obtaining target elements and contextual information, effectively preventing event bubbling, customizing event processing logic, and improving page response speed. Detailed introduction: 1. It is convenient to obtain the target element and contextual information. In the event capture phase, when an event occurs, the browser will start from the outermost element and search for elements associated with the event layer by layer until the target element is found. So far; 2. Effectively prevent event bubbling. In the event model, when an event occurs, it will be passed down layer by layer starting from the outermost element. This process is called event bubbling, etc.

Application cases of event bubbling and event capturing in front-end development Event bubbling and event capturing are two event delivery mechanisms that are often used in front-end development. By understanding and applying these two mechanisms, we can handle interactive behaviors in the page more flexibly and improve user experience. This article will introduce the concepts of event bubbling and event capturing, and combine them with specific code examples to demonstrate their application cases in front-end development. 1. The concepts of event bubbling and event capture. Event bubbling (EventBubbling) refers to the process of triggering an element.

Event bubbling and event capturing refer to two different ways of event propagation when handling events in the HTML DOM. Detailed introduction: 1. Event bubbling means that when an element triggers an event, the event will propagate from the innermost element to the outermost element. That is to say, the event is first triggered on the trigger element, and then bubbles upward step by step until it reaches the root element; 2. Event capture is the opposite process. The event starts from the root element and is captured step by step until it reaches the trigger event. Elements.

Modifiers of Vue.js are used to modify the behavior of instructions. Commonly used modifiers include: delayed execution (.lazy), cached calculation results (.memo), forced conversion to numbers (.number), trimming spaces (.trim), and blocking Default behavior (.prevent), prevent event bubbling (.stop), execute only once (.once), trigger only on the current element (.self), trigger during the event capture phase (.capture), trigger when the element enters the DOM (.enter), triggered when the element leaves the DOM (.leave).

Event bubbling (event bubbling) means that in the DOM, when an event on an element is triggered, it will bubble up to the parent element of the element, and then bubble up to higher-level parent elements until it bubbles up. Go to the root node of the document. While event bubbling is useful in many situations, it can sometimes cause some common problems. This article will discuss some common problems and provide solutions. The first common problem is triggering an event multiple times. When an event on an element bubbles to multiple parent elements, it may cause

The situations where event capture is used include that the position of the target element is not fixed, events need to be preprocessed in advance, custom event delegation is required, and asynchronously loaded elements are processed, etc. Detailed introduction: 1. The position of the target element is not fixed. When the position of the target element is not fixed, the event cannot be processed through event bubbling, because the event bubbling is passed upward from the target element. If the position of the target element is not fixed, , the event handler cannot be accurately triggered; 2. The event needs to be preprocessed in advance, and sometimes some preprocessing operations need to be performed before the event is passed to the target element, etc.

Which JS events will not bubble? In JavaScript, event bubbling means that when an element triggers an event, the event will bubble up to higher-level elements until it bubbles to the document root node. The event handlers are then executed in the order they bubble up. However, not all events bubble up. Some events will only execute the event handler on the target element after being triggered, without bubbling up to higher-level elements. Here are some common events that do not bubble: focus and blur events: