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How to load javascript libraries conditionally depending on whether it is Design mode or not?

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TitleHow to load javascript libraries conditionally depending on whether it is Design mode or not?
URL Namehow-to-load-javascript-libraries-conditionally-depending-on-whether-it-is-design-mode-or-not
Article Number000114377
EnvironmentProduct: Sitefinity
Version: 11.x, 12.x, 13.x
OS: All supported OS versions
Database: All supported Microsoft SQL Server versions
Question/Problem Description
Sometimes editing a page results on unresponsive buttons and features because of custom javascript libraries that conflict with the libraries Sitefinity loads in the backend. 

How to prevent the load of the custom javascript libraries in the backend while editing a page ? 
Steps to Reproduce
Clarifying Information
Error Message
Defect Number
Enhancement Number
If the Page template used is a custom MVC consider this approach: 
@if (!Telerik.Sitefinity.Services.SystemManager.IsDesignMode) {
      <script src="THE_PATH_TO_THE_CUSTOM_LIBRARY"></script>

If the page template is based on a master page (Web Form): 
<head runat="server">
<title>Hi folks</title>

<asp:placeholder runat="server">
<% if (!Telerik.Sitefinity.Services.SystemManager.IsDesignMode) { Response.Write("<script src='/Sitefinity/WebsiteTemplates/MyTemp/App_Themes/Blue/Js/THE_CUSTOM_LIBRARY.js'></script>"); } %>


Last Modified Date4/5/2021 12:03 PM
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