How to debug a custom style of a calendar pop-up box disappearing in a web page?

Web calendar pop-up style debugging skills

In web development, when modifying the calendar pop-up style, directly manipulating the DOM element may cause the pop-up to disappear. This article provides a debugging method that can effectively modify the style of the pop-up box even if it disappears after the developer tool is opened.

Problem: Clicking the calendar control pops up the calendar panel, but when the DOM element is selected in the browser console, the panel disappears. The goal is to modify the panel style while viewing the element labels.

Solution: Use setTimeout and debugger

setTimeout function delays the execution of code, and debugger statement pauses the execution of code, which facilitates developers to check the page status and DOM structure.

Enter and execute the following code in the browser console:

 setTimeout(() => { debugger; }, 2000);

This code will pause execution after 2 seconds. This period of time is enough for you to click to open the calendar pop-up box. When the code is paused, the calendar pop-up box is still visible, and you can find the corresponding DOM element in the console and modify its style. This is equivalent to capturing its page status before the pop-up disappears.

Core idea: Use debugger to pause code at the right time to ensure debugging and style modifications are performed when the calendar pop-up box is visible, so as to avoid the pop-up box disappearing due to developer tool operations.

This method effectively solves the problem of the disappearance of the calendar box during the debugging process, and ultimately achieves the purpose of custom styles.

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