app/assets/javascripts/your_platform/user_group_memberships.js.coffee
$(document).ready ->
# In the memberships#index table,
# this removes the tr when confirming membership deletion.
#
# The deletion itself is handled by rails:
# remove_button helper.
#
$("table.memberships .remove_button").bind 'confirm:complete', (e, answer)->
if (answer)
$(this).closest('tr').remove()