问题
I'm making a playlist option in the project I'm working on and I'm trying to get a dropdown for all the videos in the list.
which is easy
<select ng-options="vid.Id for vid in playList.Videos track by video.Id" ng-model="selected" class="browser-default"></select>
but this shows a drop down of the Id's, but now I want it to show the position in the list +1;
So when playing video 5/15 the drop down should show 1 to 15 (so not 0 to 14) and 5 should be selected.
any idea on how to accomplish this?
回答1:
If you want to display index of the current video as option text, then this ngOptions expression should do the trick:
ng-options="vid as playList.Videos.indexOf(vid)+1 for vid in playList.Videos track by video.Id"
The key here is that you can use indexOf method on Videos array to calculate current video index, and then add 1.
回答2:
You can track by the index of the array. $index is set to the item index or key.
<select ng-options="vid as ($index + 1) for vid in playList.Videos track by $index" ng-model="selected" class="browser-default"></select>
来源：https://stackoverflow.com/questions/28849069/angularjs-ng-option-get-index