如何获得角度ui网格footerTemplate工作？

Angular UI-Grid has a property called footerTemplate, which is supposed to offer the possibility to create a custom footer template. I tried entering html content (a div with some text) in a string, I've also tried adding a .html file name in the string and even the ID of a rendered div, but none of them seem to work. It also wasn't clear for me if I need to enable showGridFooter for this or not, so I tried both, but the footerTemplate is either not shown at all, or if I set showGridFooter to true, it shows the default footer (total lines in the grid). What am I missing here?Angular UI-Grid has a property called footerTem