jquery gets close event

In web development, when we need to close an element on a page, we usually need to obtain the close event to perform a specific operation. In jQuery, a very simple way is provided to obtain the closing event of a certain element.

How to get the closing event:

In jQuery, we can get the closing event of the element by using the .on() method. The syntax of this method is as follows:

$(selector).on(event, childSelector, data, function)

Among them, the parameter description is as follows:

• selector: The element selector to which the closing event is bound.
• event: The name of the event to be bound. For element closing events, you can use the "beforeunload" or "unload" event.
• childSelector: optional parameter, indicating the child element selector to which the event is bound.
• data: Optional parameter indicating additional data to be passed.
• function: The function to be executed will be called when the shutdown event occurs.

Here is a sample code:

$(window).on('beforeunload', function() {
    alert('你确定要关闭此页面吗？');
});

In this example, we use the $(window) selector to select the entire browser window and bind using the .on() method The "beforeunload" event. When the user attempts to close the window, a prompt box will pop up asking the user if they are sure they want to close the page.

Note:

When using element closing events, you need to pay attention to the following points:

• Element closing events usually cannot be called through code and can only be called in Triggered when the user performs a closing action.
• Since each browser implements element closing events differently, there is no guarantee that this method will work properly in all browsers.
• In some browsers, if there are some asynchronous operations in progress on the page, it may prevent the element close event from being triggered. Therefore, when using the element closing event, you need to ensure that all asynchronous operations have completed.

Summary:

In jQuery, getting the closing event of an element is very simple, just use the .on() method. However, when using element closing events, you need to pay attention to the implementation of each browser and the impact of asynchronous operations to ensure normal use.

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