jquery listens for subpage closing

In web development, it is often necessary to monitor some operations of the page, such as page closing, jump, etc. In the subpage, we need to know how to listen to its closing event in order to perform some operations or transfer some data when it is closed.

In this case, we can use jQuery to listen for the closing event of the subpage. The specific implementation method is as follows:

1. Get the sub-page object

In the parent page, you need to get the window object of the sub-page. This object is the window object that opens the sub-page. .open() to obtain, for example:

var childWin = window.open("child.html");

In this way, the child page object childWin can be obtained.

2. Listen to the subpage closing event

After we have the subpage object, we can use it to listen for the closing event. The method you need to use is onbeforeunload, which is triggered when the page is closed. We can bind this method to the window object of the child page, for example:

childWin.onbeforeunload = function(){
//Operations performed when closing the page
}

In this method we can perform some operations. For example, pass data to the parent page, or do some cleanup work.

3. Operations after listening to the closing event

When the subpage is closed, we can perform related operations in the onbeforeunload method. For example:

childWin.onbeforeunload = function(){
//Transfer data to the parent page
window.opener.postMessage(data, '*');
//Perform cleanup work
//...
}

Here, we use the window.opener.postMessage() method to pass data to the parent page. This method is a method of sending data to the parent page in the child page. The * indicates that data can be sent to any page.

In addition to passing data, we can also perform some cleaning work. This includes closing open connections, deleting local cache, etc. These tasks are all to ensure data integrity and security when the page is closed.

To sum up, we can use jQuery to listen to the closing event of the subpage in order to perform some operations or transfer some data when it is closed. This method is relatively simple and commonly used, and is an essential skill for front-end developers.

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