How to namespace Twitter Bootstrap so styles don&#

I want to use Twitter Bootstrap, but only on specific elements, so I need to figure out a way to prefix all Twitter Bootstrap classes with my prefix, or use the less mixins. I'm not experienced with this yet so I don't quite understand how to do this. Here's an example of the HTML that I'm trying to style:

<div class="normal-styles">
  <h1>dont style this with bootstrap</h1>
  <div class="bootstrap-styles">
    <h1>use bootstrap</h1>
  </div>
</div>

In this example, Twitter Bootstrap would normal style both h1s, but I want to be more selective about which areas I apply the Twitter Bootstrap styles.

标签： twitter-bootstrap less

11条回答

叛逆

2楼-- · 2019-01-03 12:43

To explain better all the steps what Andrew was talking about for those who don't know what Less is. Here is a link that explain pretty well how it is done step by step How to isolate Bootstrap or other CSS libraries

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欢心

3楼-- · 2019-01-03 12:43

Most simple solution - start to use custom build isolated css classes for Bootstrap.

For example, for Bootstrap 4.1 download files from css4.1 directory -

https://github.com/cryptoapi/Isolate-Bootstrap-4.1-CSS-Themes

and wrap your HTML in a div with the class bootstrapiso :

<div class="bootstrapiso">
<!-- Any HTML here will be styled with Bootstrap CSS -->
</div>

Page template with isolated bootstrap 4 will be

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="description" content="">
    <title>Page1</title>

    <!-- Isolated Bootstrap4 CSS - -->
    <link rel="stylesheet" href="css4.1/bootstrapcustom.min.css" crossorigin="anonymous">   

    <!-- JS -->
    <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js" crossorigin="anonymous"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js" crossorigin="anonymous"></script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js" crossorigin="anonymous"></script>
    <script defer src="https://use.fontawesome.com/releases/v5.0.9/js/all.js" crossorigin="anonymous"></script>

  </head>

  <body>

  <div class="bootstrapiso">
  <!-- Any HTML here will be styled with Bootstrap CSS -->
  </div>

  </body>
</html>

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Viruses.

4楼-- · 2019-01-03 12:45

@Andrew great answer. You'll also want to note that bootstrap modifies the body {}, mainly to add font. So when you namespace it via LESS/SASS your output css file looks like this: (in bootstrap 3)

.bootstrap-styles body {
    font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
    font-size: 14px;
    line-height: 1.428571429;
    color: #333333;
    background-color: white;
}

but obviously there will not be a body tag inside your div, so your bootstrap content will not have the bootstrap font (since all bootstrap inherits font from parent)

To fix, the answer should be:

.bootstrap-styles {
    font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
    font-size: 14px;
    line-height: 1.428571429;
    color: #333333;
    background-color: white;

    @import 'bootstrap';
}

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做自己的国王

5楼-- · 2019-01-03 12:46

Namespacing breaks the Modal plugin's backdrop div, since that is always added directly to the <body> tag, bypassing your namespacing element which has the styles applied to it.

You can fix this by changing the plugin's reference to $body before it shows the backdrop:

myDialog.modal({
    show: false
});

myDialog.data("bs.modal").$body = $(myNamespacingElement);

myDialog.modal("show");

The $body property decides where the backdrop will be added.

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Ridiculous、

6楼-- · 2019-01-03 12:48

As a further note for everyone. To get modals working with a backdrop you can simply copy these styles from bootstrap3

.modal-backdrop {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 1040;
  background-color: #000;
}
.modal-backdrop.fade {
  filter: alpha(opacity=0);
  opacity: 0;
}
.modal-backdrop.in {
  filter: alpha(opacity=50);
  opacity: .5;
}

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forever°为你锁心

7楼-- · 2019-01-03 12:52

This turned out to be easier than I thought. Both Less and Sass support namespacing (using the same syntax even). When you include bootstrap, you can do so within a selector to namespace it:

.bootstrap-styles {
  @import 'bootstrap';
}

Update: For newer versions of LESS, here's how to do it:

.bootstrap-styles {
  @import (less) url("bootstrap.css");
}

A similar question was answered here.

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