JavaScript drag and drop sorting is linked to check boxes: How to avoid sorting reset after check boxes are switched?

JavaScript drag and drop sorting and check box linkage: maintaining sorting stability

This article solves a common JavaScript development problem: how to keep the order of sorted tags below unchanged after switching the checkbox above the page.

Problem Description: The program combines checkbox controls label generation and drag-and-drop sorting functions of labels. However, when the user sorts and switches the checkbox again, the sorting result will be lost.

Problem analysis: The root cause lies in the data update mechanism. When switching the check box, the program may regenerate the tag data array, ignoring the sort determined by the user through the drag and drop operation. Simply using the map method does not solve this problem because it only maps the data and does not change the order.

Solution: The key is to maintain the sorting information of the tags. We propose two methods:

Method 1: Add sorting field

1. Add a sort field for each label data to record the sort location.
2. When dragging and sorting, update the value of the sort field.
3. When switching the check box, sort the data array according to the sort field, thereby restoring the previous sort. This ensures that the data is sorted by sort field regardless of the operation.

Method 2: Use push and splice operations

1. When switching check boxes, avoid regenerating the entire array with map .
2. When the check box is selected, add label data using push method; when unchecked, use splice method to remove data.
3. In the Add and Remove operations, make sure sort field correctly reflects the label order. This approach avoids data reconstruction, thus preserving sorting.

Through the above methods, the sort reset caused by check box switching can be effectively prevented and the expected functions can be achieved. Which method to choose depends on the specific situation of the project and the code structure. Method 1 is more concise, and method 2 may be more flexible in some cases.

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