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jQuery(document).ready(function($) {
    // @awt2542 PR #867
    var lastChecked = null;
    $(document).on('click', '.InputfieldCheckboxes ul input[type=checkbox]', function(e) {
        var $checkboxes = $(this).closest('ul').find('input[type=checkbox]');
        if(!lastChecked) {
            lastChecked = this;
            return;
        }
        if(e.shiftKey) {
            var start = $checkboxes.index(this);
            var end = $checkboxes.index(lastChecked);
            // $checkboxes.slice(Math.min(start,end), Math.max(start,end)+ 1).attr('checked', lastChecked.checked); // JQM
            $checkboxes.slice(Math.min(start,end), Math.max(start,end)+ 1).prop('checked', lastChecked.checked ? true : false);
        }
        lastChecked = this;
    });
    
    // abandon columns if it results in multi-line label wrapping
    $(document).on('resized', '.InputfieldCheckboxes, .InputfieldPage', function(e) {
        $(this).find('.InputfieldCheckboxesColumns').each(function() {
            var $ul = $(this);
            var height = 0;
            var collapseColumns = false;
            $ul.children('li').each(function() {
                var $li = $(this);
                if(collapseColumns) return;
                if(!height) {
                    height = $li.height();
                    return;
                }
                var diff = Math.abs($li.height() - height); 
                if(diff > 5) collapseColumns = true; 
            });
            if(collapseColumns) {
                $ul.removeClass('InputfieldCheckboxesColumns'); 
                $ul.find('li').css('width', '100%');
            }
        });
    });
    $(document).on('reloaded', '.InputfieldCheckboxes, .InputfieldPage', function(e) {
        if($(this).find('.InputfieldCheckboxesColumns').length) $(this).trigger('resized');
    });
    $(".InputfieldCheckboxesColumns").closest('.Inputfield').trigger('resized');
});