Unexpected results from CSS nth-child selector

Creating a dynamic table and updating its cell values accordingly while handling asynchronous returns brings about some challenges. The number of columns can vary, but the rows remain constant within this section of the table (7 rows).

When trying to update a column using the nth-child selector, it's crucial to understand the number of columns in the table and the specific column being modified at the time. For instance, using formulas like 5n+1 to update the first column of a 5-column table or 3n+2 to modify the second column of a 3-column table.

The targeted columns are those with the class "components," but the challenge lies in determining how these "components" cells are indexed – whether they follow a row-by-row or column-by-column pattern.

Using a mathematical approach similar to nth-term formulas, like 5n+0, the index of highlighted cells can be calculated – starting from either zero or one, depending on the indexing convention.

While the process seems to work for every row except the first one, testing in the snippet may not always align with expectations. The modification in this example focuses on changing cell colors using CSS instead of jQuery for simplicity, with the belief that it won't affect the underlying logic.

Answer №1

The issue with the first row after "Total" not working as expected is due to it containing seven columns. The CSS selector td.components:nth-child(5n+2) will style the 2nd child (if it matches td.components) and every 5th child after that 2nd one that also matches td.components.

However, it still counts other children. In the first row, the two columns with rowspan="7" are counted. It skips styling the 2nd column as it lacks the class .components, then counts 5 columns over and styles that column because it does have the .components class.

In subsequent rows, there are only 6 columns in the markup, so the styles are applied to the 2nd column in each row due to it having the .components class.

To exclude the first two columns from the count, consider placing them in their own row or using a different logic, like a :not() selector.

Alternatively, if using jQuery to apply styles, instruct the loop to skip the first row after "Total" and apply specific styles to that one.

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