The control does not have option to specify whether the script will be loaded only in Design, Live, Preview. I will add this as a feature request(386493).
Currently this could be done with a custom control.
IsDesignMode is extension static method which determines whether the control is in Sitefinity design mode - you are editing a page. There are also
- IsPreviewMode- determines whether the control is in Sitefinity preview mode.
- IsBackend -determines whether a control instance is in backend.
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