check-uncheck-all.js

           /*

                      <a class="btn btn-link" data-checkall=".chst">check all</a>
                      <a class="btn btn-link" data-uncheckall=".chst">uncheck all</a>
            */     
                
                     var changeBoxesEvent = document.createEvent('HTMLEvents');
                changeBoxesEvent.initEvent('change', true, false);
                var t = document.querySelectorAll('[data-uncheckall]');
                if (t) {
                    [].forEach.call(t, function (el) {
                        var targets = document.querySelectorAll(el.getAttribute('data-uncheckall')) || [];
                        if (targets.length) {
                            el.addEventListener('click', function () {
                                targets.forEach(function (target) {
                                    if (!target.checked == false) {
                                        target.checked = false;
                                        target.dispatchEvent(changeBoxesEvent);
                                    }
                                });
                            });
                        }
                    });
                }

                var t = document.querySelectorAll('[data-checkall]');
                if (t) {
                    [].forEach.call(t, function (el) {
                        var targets = document.querySelectorAll(el.getAttribute('data-checkall')) || [];
                        if (targets.length) {
                            el.addEventListener('click', function () {
                                targets.forEach(function (target) {
                                    if (!target.checked) {
                                        target.checked = true;
                                        target.dispatchEvent(changeBoxesEvent);
                                    }
                                });
                            });
                        }
                    });
                }
                delete(t);