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问题:

So in bootstrap3 we had the 'Customize and download' option, which we could download only whatever we needed. Now that bootstrap 4 supports flexbox, I only wanna download the flex grid system of bootstrap 4 and I cant see that option anymore. is there any way to do this ?

回答1:

UPDATE (JULY 2019)

With the release of v4 you can simply use either bootstrap-grid.css or bootstrap-grid.min.css , it only includes grid system and flex utilities

Old Answer:

At this Alpha stage, you can toggle between true/false for using flexbox (if using a CSS preprocessor) as per bootstrap V4 Alpha docs

Flexbox support has finally come to Bootstrap. Opt-in to the new CSS layout styles with the flick of a variable or the swap of a stylesheet.

How it works:

If you’re familiar with modifying variables in Sass—or any other CSS preprocessor—you’ll be right at home to move into flexbox mode.

Open the _variables.scss file and find the $enable-flex variable.

Change it from false to true.

Recompile, and done!

Alternatively, if you don’t need the source Sass files, you may swap the default Bootstrap compiled CSS with the compiled flexbox variation. Head to the download page for more information.

回答2:

At the time of answering this question, if you download the compiled .zip found here, it comes with a css folder that has three stylesheets,

bootstrap-grid.css
bootstrap-normalize.css
bootstrap.css

The bootstrap-grid file has only the grid CSS and nothing else, which is what you're looking for.

回答3:

if you just want to use flex-grid. I recommend

https://www.flexible-grid.com

https://github.com/kenangundogan/flexible-grid

flexible-grid/
    ├── scss
        ├── flexible-grid.scss
        ├── _variables.scss
        ├── _definitions.scss
        ├── _wrapper.scss
        ├── _array-list.scss
        ├── _attribute.scss
        ├── _grid.scss
        └── _normalize.scss

回答4:

Update 2019, Bootstrap 4.3+

You can get the grid only using bootstrap-grid.css included in the Bootstrap 4 download. http://getbootstrap.com/docs/4.1/getting-started/contents/#css-files

This includes the grid, flexbox and display utilities, but not all the utilities like the borders, spacing, etc.. If you want a further 'Customize and download' option you must rebuild Bootstrap using SASS, or use a 3rd party tool like themestr.app

Original Answer, Bootstrap 4 alpha (flexbox optional)

There may be customizable downloads in the future, but the only way currently is to enable the $enable-flex variable. Here's an example using SASS.

$enable-flex:true;

http://codeply.com/go/JbGGN4Ok3A

As of Bootstrap 4 alpha 6, flexbox is now the default: http://www.codeply.com/go/p/bootstrap_4.0.alpha.6