Web Forms :: At Least One Checked Validation For CheckBox Inside ListView Using Custom Validator

With respect to my previous questionListview Checkbox checked using jquery . The code works fine and it checks for any checkbox checked in listview and returns a alert msg but now it does not check for any required field validators in the page. I the checkbox is  checked it fires button click event. I need to check for validators also and after that only it must check for checkbox validation. The link for previous question is [URL] .....

I need to merge the code for required field validation check with checkbox check.