include views vs render templates in grails

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What is the technical differences between render a template and include a view in grails?

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You generally render a template (from a controller) as part of an AJAX request when you're updating only part of a page. I don't know what you mean by 'include a view'. If you mean render a template from a GSP then it's generally just a convenient way of reusing pieces of your presentation within a view.

So if I have a template that contains a login form, I may want to include that template in several different layouts/pages.

If I have a template that contains search results I may want to render the template from a controller in response to an AJAX request that occurs when the user scrolls to the end of my current set of results or the user updates some search criteria.