AngularJS：在加载内容时添加按钮Spinner

I am using button spinner while loading the content, when the user clicks on the "Search" button content will load, at this time buttonLabel will be changed to "Searching" and spinner will be shown (Here button will be diabled). After loading the content (Promise resolved) buttonLable will be reverted back to "Search" (button will be enable here). I have tried the below code, but it is always showing the spinner.I am using button spinner while loading the con