Check out example codes for "select all checkbox rails". It will help you in understanding the concepts better.

Code Example 1

$(document).ready(function(){
   $('#check_all').on("click", function() {
     // grouping all the checkbox using the classname
     var checkboxes = $("class name for the checkbox");
     // check whether checkboxes are selected.
     if(checkboxes.prop("checked")){
        // if they are selected, unchecking all the checkbox
        checkboxes.prop("checked",false);
     } else {
        // if they are not selected, checking all the checkbox
        checkboxes.prop("checked",true);
     }
   });
});

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