jquery cell relative position remains unchanged

When using jQuery to operate a table, we may need to change the row and column positions of some cells in the table based on specific conditions. However, it is also necessary to ensure that the relative positions of other cells remain unchanged to ensure that the overall structure of the table is not destroyed. This article will show you how to use jQuery to keep the relative position of cells unchanged when changing their position.

1. Get cell position information

In jQuery, we can use the index() method to get the position index of an element in its parent element. For example, we can use the following code to get the index of the first cell in the current row:

$(this).index();

Similarly, we can also use the parent() method to get the row where the cell is located , column elements, and use the index() method to get their position index. For example, the following code will return the position index of the row element where the current cell is located:

$(this).parent().index();

The above method can help us obtain the position information of the cell in the table to facilitate subsequent operations.

2. Change the cell position

When we need to change the position of some cells in the table, we can use jQuery's insertBefore() and insertAfter () method. These two methods move the selected element in front of or behind its target element.

For example, the following code will move the current cell to the front of the next cell:

$(this).insertBefore($(this).next());

Similarly, the following code will move the current cell to the back of the previous cell:

$(this).insertAfter($(this).prev());

The above method can help us change the position of cells, but it may cause changes in the positions of other cells, thereby destroying the overall structure of the table. Next, we'll show you how to use jQuery to keep the relative positions of other cells in the table unchanged.

3. Keep the relative position of cells unchanged

In order to keep the relative position of other cells in the table unchanged, we can use the following method:

1. Cache Position information of each cell

Before moving the cell, we need to cache the position information of each cell in the table, including the position index of the row and column, so that it can be used during subsequent operations. use. We can use a method similar to the following code to achieve this:

var cells = [];
$('td').each(function() {
    var cell = {};
    cell.columnIndex = $(this).index();
    cell.rowIndex = $(this).parent().index();
    cells.push(cell);
});

The above code will obtain the row and column position index of each cell in the table and store them in an array for subsequent use.

2. Rearrange cell positions

After caching the position information of each cell, we can perform the cell moving operation. However, before executing the insertBefore() or insertAfter() method, we need to rearrange their order according to the cell position information. You can use the following code to achieve this:

cells.sort(function(cell1, cell2) {
    if(cell1.rowIndex == cell2.rowIndex) {
        return cell1.columnIndex - cell2.columnIndex;
    }
    return cell1.rowIndex - cell2.rowIndex;
});

$.each(cells, function(index, cell) {
    var targetIndex = cell.rowIndex * $('tr').eq(0).children().length + cell.columnIndex;
    $('td').eq(index).detach().insertBefore($('td').eq(targetIndex));
});

The above code will rearrange the position of each cell in the table to ensure that the relative position does not change when the cell moves.

4. Summary

When using jQuery to operate tables, changing cell positions is a common requirement. But in order to maintain the overall structure of the table, we need to ensure that the relative positions of other cells remain unchanged. By caching the position information of each cell and rearranging the order of the cells, we can easily implement the function of keeping the relative position of the cell unchanged when changing the position of the cell.

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