How to Customize Column Widths in Bootstrap 4?

Column Sizing in Bootstrap 4

The ability to customize column widths in Bootstrap 3 using col-sm-xx has been discontinued in Bootstrap 4. This change may be due to the implementation of flexbox in Bootstrap 4, which provides a different approach to layout. To achieve column resizing in Bootstrap 4, you can explore alternative solutions.

Ensuring the Presence of the table Class

Firstly, verify that your table contains the "table" class. Bootstrap 4 tables are opt-in, requiring you to explicitly add this class. This is essential for proper formatting and column sizing.

Flexbox and CSS Changes

In Bootstrap 3, CSS was used to prevent table cells from floating and ensure they behave correctly. However, this CSS is not included in Bootstrap 4 alpha. Adding this CSS manually can help ensure that columns adhere to the widths specified in the table header (thead).

d-inline-block for Table Cells

Another approach is to apply the "d-inline-block" class to table cells (td). This counteracts the default "display:flex" behavior of columns, allowing them to assume the appropriate widths.

Sizing Utilities Classes

Bootstrap 4 provides sizing utility classes like "w-25" and "w-50" for setting specific widths on columns. These classes offer a simplified and responsive method of column sizing.

Flexbox and col-* Grid Classes

You can also leverage the d-flex class on table rows (tr) and the col-* grid classes on columns (th,td). This approach allows for flexible and responsive column widths.

Note: Using display:flex on table rows may impact table borders, requiring additional adjustment.

In summary, column sizing in Bootstrap 4 has changed due to the transition to flexbox. Alternative solutions are available, such as ensuring the presence of the table class, modifying CSS, using d-inline-block for table cells, sizing utility classes, and flexbox with col-* grid classes on rows and columns.

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