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I have a webforms old project using bootstrap 3 and i´m starting to build new implementantios with React JS.
I create a bundle.js (a transpilation of my main index of the React pages folder) and execute this bundle in a WebForm page:

<asp:Content ID="Content1" ContentPlaceHolderID="MainContent" runat="server">
    <section >
        <div id="app">

<asp:Content ID="Content2" ContentPlaceHolderID="PageScripts" runat="server">
    <script src="React/dist/bundle.js" type="text/javascript"></script>

The problems is: My React´s scripts are using Bootstrap 4 and when they´re renderized, it happens some conflits between the two versions of bootstrap.

Anyone has an idea of how could i isolated a div or a page only with the version 4 and keep the 3 for the old pages?

What I have tried:

I´ve tried using SASS and LESS styles to create a CSS tag to apply the version 4 only for a div, but with no success.

<section class="bootstrap-iso">
      <div id="app">


And the scss style:

.bootstrap-iso {
    @import url("");
Updated 5 days ago
Kornfeld Eliyahu Peter 14-Jan-20 3:17am
You probably should add
  all: unset;

  all: initial;

to clean the previous rules from bootstrap 3...

1 solution

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Solution 1

You can't isolate a single element to use a different version of Bootstrap. The Bootstrap CSS rules apply to the entire HTML document, as do the Bootstrap scripts.

You'll need to create a separate page which references the BS4 stylesheets and scripts, and which doesn't reference the BS3 files. Since those files are probably referenced from your master page, you'll need to create a new master page for your BS4 pages.

If your site has a lot of UI in the master page which is using BS3, then you'll probably want to keep your BS4 master page mostly empty, and embed your BS4 pages in an <iframe>.

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