AngularJS typeahead + multi select tags

问题:

What I'm looking for is a input that resembles Gmails typeahead for email addresses

Challenges:

1) It should display both the Name EmailAddress and Image (Basically a customizable template)

2) It should display the Name of the contact added to the list

3) It should work with backspace to remove the previous entry

4) It should work with select and , to add the new etnry

回答1:

.directive('typeahead', function () {
    return {
        restrict: 'AEC',
        scope: {
            model: '=ngModel'
        },
        link: function link($scope, $element, $attrs) {
            $scope.$watch('inputValue', function (value) {
                $scope.changed();
            });

            $scope.Emails = ['[e-mail]', '[e-mail]', '[e-mail]'];

            $element.bind("keydown keypress", function (event) {
                switch (event.keyCode) {
                    case 40:
                        $scope.$apply(function () {
                            if ($scope.selected < $scope.List.length) {
                                $scope.selected++;
                            }
                        });
                        event.preventDefault();
                        break;
                    case 38:
                        $scope.$apply(function () {
                            if ($scope.selected > 0) {
                                $scope.selected--;
                            }
                        });
                        event.preventDefault();
                        break;
                    case 13:
                        $scope.$apply(function () {
                            $scope.selectAndClose($scope.List[$scope.selected]);
                        });
                        event.preventDefault();
                        break;
                    case 32:
                    case 188:
                        $scope.$apply(function () {
                            inputValues = $scope.inputValue.split(',');
                            for (var i = 0; i < inputValues.length; i++) {
                                if (inputValues[i].length > 0) {
                                    $scope.GetOrCreateEmailAndSelect(inputValues[i]);
                                }
                            }
                            $scope.clear();
                            $scope.close();
                        });
                        event.preventDefault();
                        break;
                    case 27:
                        $scope.$apply(function () {
                            $scope.close();
                        });
                        event.preventDefault();
                        break;
                    case 8:
                        $scope.$apply(function () {
                            if ($scope.inputValue == null || $scope.inputValue.length == 0) {
                                $scope.model.pop();
                            }
                        });
                        break;
                }
            });

            $scope.remove = function (emailid) {
                $scope.model.splice($scope.model.indexOf(emailid), 1);
            }

            $scope.changed = function () {
                fetchEmail({
                    'EmailAddress__icontains': $scope.inputValue
                }).then(function (data) {
                    $scope.List = data;
                    if (typeof ($scope.model) === typeof ([]) && $scope.model !== null) {
                        for (var i = 0; i < $scope.model.length; i++) {
                            for (var j = 0; j < $scope.List.length; j++) {
                                if ($scope.List[j].id == $scope.model[i].id) {
                                    $scope.List.splice(j, 1);
                                }
                            }
                        }
                    }
                    $scope.selected = 0;
                    dropdownShow = false;
                    if ($scope.List.length > 0) {
                        if (typeof ($scope.inputValue) !== 'undefined' && $scope.inputValue !== null) {
                            if ($scope.inputValue.length > 1) {
                                dropdownShow = true;
                            }
                        }
                    }
                    $scope.dropdownShow = dropdownShow;
                });
            };

            $scope.selectAndClose = function (value) {
                $scope.select(value);
                $scope.clear();
                $scope.close();
            };

            $scope.select = function (value) {
                $scope.model.push(value);
            };
            $scope.clear = function () {
                $scope.inputValue = null;
            };
            $scope.close = function () {
                $scope.dropdownShow = false;
            };
            $scope.GetOrCreateEmailAndSelect = function (EmailAddress) {
                EmailAddress = EmailAddress.toString();
                data = $scope.fetchEmail(EmailAddress); //you can add an ajax call here
                if (data.length == 0) {
                    $scope.CreateEmail(EmailAddress);
                } else {
                    $scope.select(data[0]);
                }
            });

        $scope.fetchEmail =function(EmailAddress) {
            result = [];
            for (var i = 0; i < $scope.Emails.length; i++) {
                if ($scope.Emails[i].indexOf(EmailAddress) > -1) {
                    result.push($scope.Emails[i]);
                }
            }
        }

        $scope.CreateEmail =function(EmailAddress) {
            $scope.Emails.push(EmailAddress);
        };
    }
    $scope.mouseoverChoice = function (emailidobject) {
        $scope.selected = $scope.List.indexOf(emailidobject);
    };
    $scope.editEmailId = function (emailidobject) {
        $scope.inputValue = emailidobject.EmailAddress;
        $scope.remove(emailidobject);
    }
    $scope.CheckSelected = function (element) {
        if (typeof ($scope.List) !== 'undefined' && typeof ($scope.selected) !== 'undefined' && typeof ($scope.List[$scope.selected]) !== 'undefined') {
            return $scope.List[$scope.selected].id == element.id;
        } else {
            return false;
        }
    }
},
    templateUrl: 'typeaheadtemplate.html',
}
});