In your Wagtail, you sometimes may want to vary the template output depending on whether the page is being previewed or viewed live.
It might be as simple as adding a banner to clearly show that you are previewing a page or you might want to disable some tracking code during preview (Google Analytics for example).
Wagtail adds a variable is_preview
to the request you can use to check this:
For example, if you have visitor tracking code such as Google Analytics in place on your site, it's a good idea to leave this out when previewing, so that editor activity doesn't appear in your analytics reports. Wagtail provides a request.is_preview
variable to distinguish between preview and live.
So, in your template, you can do:
1{% if not request.is_preview %}
2 <script>
3 (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
4 ...
5 </script>
6{% endif %}
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