What is Template Specialization ?

Template specialization is a way to dynamically switch partials in your views, to some other partial, based on some rules that you can specify in the form of a json config in you app.

Why would you want to do this ?

This may become important and very handy when:

• you are writing apps that need to be supported for multiple locales and parts of it can look different in different country/regions
• you want part of your views to look completely different across various devices (an alternate, more flexible solution to adaptive/responsive designs)
• you want to A/B test ..... Or any other creative way you'd like to use it.

specialization-example

An example express 4.0 demonstrating template specialization with dustjs.

To see it working:

To start the app:

• In you console

$ node .

• In your browser:

http://localhost:8000

To see specialization at work

• Setting an experiment will show a different layout for your page with partials arranged differently

http://localhost:8000/setCustom?experiment=exp1
http://localhost:8000/setCustom?experiment=exp1&extra=coupons

• Setting a country will change the signup form to cater to that country

http://localhost:8000/setCustom?country=uk

You will see that the specialization rules will be set in the session and you will be redirected to the index page with the right specialization rules.

You can play with the specialization rules in the config + what you set in the context to see how dust partials gets specialized. Have Fun!!