How do Bootstrap lists be arranged vertically?

Bootstrap itself does not provide direct vertical listing function, and needs to be cleverly implemented using its mechanism: flexbox: add "d-flex flex-column" class to the list parent container to arrange list items vertically. Combined with raster system: set column widths for list items containing complex content, and control the layout more finely. Be careful to use Bootstrap's raster core "row" and "col" classes to avoid using floating or positioning methods.

Bootstrap lists arranged vertically? This question is wonderful. It seems simple, but it actually has a secret. Many novices will fall into some pits and think that they can do it simply by adding a style, but in fact they are not. Let’s analyze it in depth today, so that you can thoroughly master the techniques of vertical arrangement of Bootstrap lists and avoid those crazy pitfalls.

First of all, it must be clear that Bootstrap itself does not directly provide the "vertical arrangement list" function. It pays more attention to responsive layout, and the arrangement of lists is usually determined by the properties of the container and list items. So, to put it bluntly, what we need to do is to cleverly utilize the existing mechanism of Bootstrap to achieve the effect of vertical arrangement.

The most common misunderstanding is to directly add vertical to the <ul></ul> or <ol></ol> tags. This is useless at all! This is not how Bootstrap class names are played.

So what should I do? The secret lies in display attributes and Bootstrap's raster system.

The easiest and most direct way is to use flexbox. We just need to add d-flex flex-column class to the parent container of the list. d-flex enables flexbox layout, flex-column is specified as vertical arrangement. The code is as follows:

 <code class="html"><div class="d-flex flex-column"> <ul class="list-group"> <li class="list-group-item">Item 1</li> <li class="list-group-item">Item 2</li> <li class="list-group-item">Item 3</li> </ul> </div></code>

This line of code is simple and efficient, and solves the problem instantly. list-group class provides Bootstrap's own list style to make your list look more beautiful. This trick is simple and crude, but easy to use!

But wait, things are not over yet. If your list items are complex, such as containing pictures and text, relying solely on flex-column may not achieve the expected results. At this time, you need more refined control. You can combine Bootstrap's raster system to set the column width for each list item to better control the layout. For example:

 <code class="html"><div class="container"> <div class="row"> <div class="col-md-6"> <div class="list-group-item">Item 1 with more complex content</div> </div> <div class="col-md-6"> <div class="list-group-item">Item 2 with more complex content</div> </div> </div> </div></code>

This code utilizes Bootstrap's raster system to place each list item in a separate column for a more flexible layout. Note that I use row and col classes here, which is the core of the Bootstrap raster system.

Remember, don't try to use float or position to achieve vertical arrangement, it will cause you to fall into the quagmire of CSS and it will be a nightmare to maintain. Bootstrap's flexbox and grid system are the right way!

Finally, regarding performance optimization, the performance differences between the two methods are actually very small. Unless the number of items in your list is extremely large, don't worry too much. More importantly, write concise and easy-to-understand code to ensure the maintainability of the code. This is the key to efficient programming! Don’t sacrifice code readability and maintainability in order to pursue extreme performance, as the gain is not worth the loss!

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