如何通过角js将json从指令传递给控制器

I have a requirement of showing the excel data on UI, for this i used ui-grid and was able to show the excel data in ui-grid. But only one sheet data gets load in ui-grid. If I am using the excel which has multiple sheets, I want to show all the sheet names in dropdown on UI and on the basis of the sheet selected the data respective to that sheet should get populated. I am able to see the data in JSON form in the directive being used but I am not able to populate the sheet names in dropdown This is the plunker for what have been done yetI have a requirement of showing the excel data