Developers often have a need to amend the HTML rendering of SharePoint, especially around lists and list forms, but in previous versions of SharePoint this was not always easy. Many developers resorted to using JavaScript to manipulate the page after it had loaded, even though this was potentially unreliable and unsupported. SharePoint 2013 solves this problem by providing the ability to specify a JavaScript ‘template override’ for several user interface elements. Even better, these can be applied globally or locally as needed. Come and learn how to transform the SharePoint interface the supported way!

Chris O’Brien on Using JavaScript Templates