Function selectPreLink

OpenReservation/wwwroot/Scripts/angular.js:30396–30458

(scope, element, attr, ctrls)

        };

        function selectPreLink(scope, element, attr, ctrls) {
            // if ngModel is not defined, we don't need to do anything
            var ngModelCtrl = ctrls[1];
            if (!ngModelCtrl) return;

            var selectCtrl = ctrls[0];

            selectCtrl.ngModelCtrl = ngModelCtrl;

            // When the selected item(s) changes we delegate getting the value of the select control
            // to the `readValue` method, which can be changed if the select can have multiple
            // selected values or if the options are being generated by `ngOptions`
            element.on('change',
                function () {
                    scope.$apply(function () {
                        ngModelCtrl.$setViewValue(selectCtrl.readValue());
                    });
                });

            // If the select allows multiple values then we need to modify how we read and write
            // values from and to the control; also what it means for the value to be empty and
            // we have to add an extra watch since ngModel doesn't work well with arrays - it
            // doesn't trigger rendering if only an item in the array changes.
            if (attr.multiple) {
                // Read value now needs to check each option to see if it is selected
                selectCtrl.readValue = function readMultipleValue() {
                    var array = [];
                    forEach(element.find('option'),
                        function (option) {
                            if (option.selected) {
                                array.push(option.value);
                            }
                        });
                    return array;
                };

                // Write value now needs to set the selected property of each matching option
                selectCtrl.writeValue = function writeMultipleValue(value) {
                    var items = new HashMap(value);
                    forEach(element.find('option'),
                        function (option) {
                            option.selected = isDefined(items.get(option.value));
                        });
                };

                // we have to do it on each watch since ngModel watches reference, but
                // we need to work of an array, so we need to see if anything was inserted/removed
                var lastView, lastViewRef = NaN;
                scope.$watch(function selectMultipleWatch() {
                    if (lastViewRef === ngModelCtrl.$viewValue && !equals(lastView, ngModelCtrl.$viewValue)) {
                        lastView = shallowCopy(ngModelCtrl.$viewValue);
                        ngModelCtrl.$render();
                    }
                    lastViewRef = ngModelCtrl.$viewValue;
                });

                // If we are a multiple select then value is now a collection
                // so the meaning of $isEmpty changes