how save hidden courses in variable removeid

I need when click on remove button hidden the courses removed then save in variable name removeid

removeid will have courses be hidden when remove

as example below

my code as following in fiddle

suppose i have courses

Id CourseName

1 c# removebutton

2 asp.net removebutton

3 javascript removebutton

suppose i remove 2,3 that represent asp.net and javascript

then removeid variable will have value 2,3 after click remove courses and be hidden

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