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IMPORTANT:   Any changes to these bindings may need to be copied into Back Office as these bindings are duplicated between the two solutions.\r\nimport * as $ from \"jquery\";\r\nimport * as ko from \"knockout\";\r\nimport * as _ from \"underscore\";\r\nimport * as localisationHelper from \"localisationHelper\";\r\n\r\n// Helpers\r\nimport \"selectTwo\";\r\n\r\n// Models\r\nimport {\r\n    DefaultSelectTwoModel, SelectTwoWithChildren, SelectTwoBindingParams, SelectTwoEventOptions,\r\n    MultipleOptionSelectionRequest, SelectTwoTemplateSelection, SelectTwoTemplateResult\r\n} from \"Content/ts/Models/Shared/SelectTwo/selectTwoModels\";\r\n\r\n// Configuration\r\nimport { SelectTwoAjaxConfiguration } from \"Content/ts/Shared/Controls/SelectTwo/Configuration/selectTwoAjaxConfiguration\";\r\n\r\nexport const Deps = {\r\n    LocalisationHelper: localisationHelper\r\n};\r\n\r\nclass SelectTwoBindings {\r\n    templateEngine: any;\r\n    selectTwoElement: any;\r\n\r\n    constructor() {\r\n        // Purpose: Configures a hierarchical list where multiple items can be selected.\r\n        ko.bindingHandlers.selectTwoMultipleWithChildren = {\r\n            init: (element: any, valueAccessor: () => KnockoutObservableArray<SelectTwoWithChildren>, allBindingsAccessor: () => SelectTwoBindingParams) => {\r\n                const dataSource = valueAccessor(),\r\n                    allBindings = allBindingsAccessor();\r\n\r\n                allBindings.allowMultiple = true;\r\n\r\n                this.configureSelectContainer(element, dataSource, allBindings);\r\n                this.reloadTriggers(element, valueAccessor(), allBindings);\r\n                this.preselectOptionWithChildItems(dataSource(), allBindings);\r\n            },\r\n            update: (element: any, valueAccessor: () => KnockoutObservableArray<SelectTwoWithChildren>, allBindingsAccessor: () => SelectTwoBindingParams) => {\r\n                const dataSource = valueAccessor(),\r\n                    allBindings = allBindingsAccessor();\r\n\r\n                this.reloadTriggers(element, valueAccessor(), allBindings);\r\n                this.preselectOptionWithChildItems(dataSource(), allBindings);\r\n            }\r\n        };\r\n\r\n        // Purpose: Configures a hierarchical list where only one item can be selected.\r\n        ko.bindingHandlers.selectTwoSingleWithChildren = {\r\n            init: (element: any, valueAccessor: () => KnockoutObservableArray<SelectTwoWithChildren>, allBindingsAccessor: () => SelectTwoBindingParams) => {\r\n                const dataSource = valueAccessor(),\r\n                    allBindings = allBindingsAccessor();\r\n\r\n                allBindings.allowMultiple = false;\r\n\r\n                this.configureSelectContainer(element, dataSource, allBindings);\r\n            },\r\n            update: (element: any, valueAccessor: () => KnockoutObservableArray<SelectTwoWithChildren>, allBindingsAccessor: () => SelectTwoBindingParams) => {\r\n                const dataSource = valueAccessor(),\r\n                    allBindings = allBindingsAccessor();\r\n\r\n                this.reloadTriggers(element, valueAccessor(), allBindings);\r\n                this.preselectOptionWithChildItems(dataSource(), allBindings);\r\n            }\r\n        };\r\n\r\n        // Purpose: Configures a standard searchable list where only one item can be selected.\r\n        ko.bindingHandlers.selectTwoSingle = {\r\n            init: (element: any, valueAccessor: () => KnockoutObservableArray<DefaultSelectTwoModel>, allBindingsAccessor: () => SelectTwoBindingParams) => {\r\n                const dataSource = valueAccessor(),\r\n                    allBindings = allBindingsAccessor();\r\n\r\n                allBindings.allowMultiple = false;\r\n\r\n                this.configureSelectContainer(element, dataSource, allBindings);\r\n            },\r\n            update: (element: any, valueAccessor: () => KnockoutObservableArray<DefaultSelectTwoModel>, allBindingsAccessor: () => SelectTwoBindingParams) => {\r\n                const dataSource = valueAccessor(),\r\n                    allBindings = allBindingsAccessor();\r\n\r\n                this.reloadTriggers(element, valueAccessor(), allBindings);\r\n                this.defaultPreselectOption(dataSource(), allBindings);\r\n            }\r\n        };\r\n\r\n        // Purpose: Configures a standard searchable list where multiple items can be selected.\r\n        ko.bindingHandlers.selectTwoMultiple = {\r\n            init: (element: any, valueAccessor: () => KnockoutObservableArray<DefaultSelectTwoModel>, allBindingsAccessor: () => SelectTwoBindingParams) => {\r\n                const dataSource = valueAccessor(),\r\n                    allBindings = allBindingsAccessor();\r\n\r\n                allBindings.allowMultiple = true;\r\n\r\n                this.configureSelectContainer(element, dataSource, allBindings);\r\n            },\r\n            update: (element: any, valueAccessor: () => KnockoutObservableArray<DefaultSelectTwoModel>, allBindingsAccessor: () => SelectTwoBindingParams) => {\r\n                const dataSource = valueAccessor(),\r\n                    allBindings = allBindingsAccessor();\r\n\r\n                this.reloadTriggers(element, valueAccessor(), allBindings);\r\n                this.defaultPreselectOption(dataSource(), allBindings);\r\n            }\r\n        };\r\n\r\n\r\n        // Purpose:     New bindings allows searches to be processed via the Database rather than loading all the content\r\n        //              at page or component load. This is especially useful for scenarios where a significant amount of\r\n        //              data could be loaded (e.g.Clubs, Locations and Inventory Items).\r\n        // Sources:     https://select2.org/data-sources/ajax\r\n        //              https://select2.org/programmatic-control/add-select-clear-items\r\n        ko.bindingHandlers.selectTwoAjax = {\r\n            init: (element: any, valueAccessor: any, allBindingsAccessor: any) => {\r\n                const value = valueAccessor(), // Note: This can be either a knockout observable or observable array\r\n                    allBindings = allBindingsAccessor(),\r\n                    selectTwoSignals = allBindings.selectTwoSignals as SelectTwoAjaxConfiguration;\r\n\r\n                ($(element)).select2({\r\n                    ajax: {\r\n                        delay: 500, // Rate limit the request to only fire once the user has stopped typing\r\n                        cache: true,\r\n                        url: allBindings.url,\r\n                        data: (params: any) => {\r\n                            return allBindings.searchParameters ? allBindings.searchParameters(params.term) : params.term;\r\n                        },\r\n                        processResults: (response: any[]) => {\r\n                            return {\r\n                                results: allBindings.mapResults ? allBindings.mapResults(response) : response\r\n                            };\r\n                        }\r\n                    },\r\n                    minimumInputLength: 3,\r\n                    placeholder: allBindings.placeholder,\r\n                    allowClear: allBindings.allowClear || false,\r\n                    multiple: allBindings.allowMultiple || false,\r\n                    templateSelection: (repo: SelectTwoTemplateSelection) => {\r\n                        return repo.text;\r\n                    },\r\n                    templateResult: (repo: SelectTwoTemplateResult) => {\r\n                        return repo.text;\r\n                    }\r\n                });\r\n\r\n                $(element)\r\n                    .on(\"select2:select\", (event: any) => {\r\n                        const eve: SelectTwoEventOptions = event;\r\n                        const dataId: number = parseInt(eve.params.data.id);\r\n\r\n                        if (ko.isObservable(value) && 'push' in value) {\r\n                            (value as KnockoutObservableArray<number>).push(dataId);\r\n                        } else {\r\n                            (value as KnockoutObservable<number>)(dataId);\r\n                        }\r\n                    })\r\n                    .on(\"select2:unselect\", (event: any) => {\r\n                        const eve: SelectTwoEventOptions = event;\r\n                        const dataId: number = parseInt(eve.params.data.id);\r\n\r\n                        if (ko.isObservable(value) && 'push' in value) {\r\n                            (value as KnockoutObservableArray<number>).remove(dataId);\r\n                        } else {\r\n                            (value as KnockoutObservable<number>)(null);\r\n                        }\r\n                    })\r\n                    .on(\"select2:clear\", function () {\r\n                        $(this).on(\"select2:opening.cancelOpen\", function (event) {\r\n                            // Note     :   Select2 default configuration is to immediately open the dropdown after clearing\r\n                            //              the option. This implementation gets around their decision by preventing the default\r\n                            //              behaviour of the plugin and ensuring the popup window is immediately closed. The\r\n                            //              decision around this has been signed off by the Product Team.\r\n                            // Source   :   https://github.com/select2/select2/issues/3320\r\n                            //              https://github.com/select2/select2/issues/3320#issuecomment-524153140\r\n                            event.preventDefault();\r\n                            $(this).off(\"select2:opening.cancelOpen\");\r\n                        });\r\n                    });\r\n\r\n                value.subscribe((newValue?: number) => {\r\n                    $(element).val(newValue).trigger('change');\r\n                });\r\n\r\n                if (selectTwoSignals != null) {\r\n                    selectTwoSignals.selectSingleOption.add(this.selectSingleOption.bind({ selectTwoElement: element }));\r\n                    selectTwoSignals.selectMultipleOptions.add(this.selectMultipleOptions.bind({ selectTwoElement: element }));\r\n                }\r\n            }\r\n        };\r\n    }\r\n\r\n    // Note: Will ensure the provided list of items are manually inserted into the Select2 container.\r\n    private selectMultipleOptions(request: MultipleOptionSelectionRequest[]) {\r\n        const ele = $(this.selectTwoElement) as any;\r\n\r\n        const options: HTMLOptionElement[] = [];\r\n\r\n        _.each(request, (item: MultipleOptionSelectionRequest) => {\r\n            options.push(new Option(item.Name, item.Id, false, true))\r\n        });\r\n\r\n        // Note         :   Select2 uses a caching mechanism to store any preselected options in memory so it can reduce calls the \r\n        //                  database when appropriate. However, this can sometimes cause issues when navigating in and out of the same\r\n        //                  workflow as it may duplicate the selection when dealing with arrays. In order to counteract this it's simpler\r\n        //                  to completely clear out the cache and reappend all the necessary selected options programatically.\r\n        ele.empty();\r\n        ele.append(options).trigger('change');\r\n    }\r\n\r\n    // Note: Will ensure the provided observable has been updated before manually inserting and selecting the value via the Select2 container.\r\n    private selectSingleOption(valueToUpdate: KnockoutObservable<any>, selectOptionValue: any, selectOptionText: any, selectOption?: boolean) {\r\n        const element = $(this.selectTwoElement),\r\n            preselectOption = selectOption || false,\r\n            optionText = ko.unwrap(selectOptionText),\r\n            optionValue = ko.unwrap(selectOptionValue);\r\n\r\n        valueToUpdate(optionValue);\r\n\r\n        if (element.find(`option[value=\"${optionValue}\"]`).length) {\r\n            element.val(optionValue).trigger('change');\r\n        } else {\r\n            const newOption = new Option(optionText, optionValue, false, preselectOption);\r\n            element.append(newOption).trigger('change');\r\n        }\r\n    }\r\n\r\n    private preselectOptionWithChildItems(dataSource: SelectTwoWithChildren[], allBindings: SelectTwoBindingParams) {\r\n        _.each(dataSource, (item: SelectTwoWithChildren) => {\r\n            this.attemptValueToggle(item, allBindings);\r\n\r\n            if (item.children && item.children.length > 0) {\r\n                this.preselectOptionWithChildItems(item.children, allBindings);\r\n            }\r\n        });\r\n    }\r\n\r\n    private defaultPreselectOption(dataSource: DefaultSelectTwoModel[], allBindings: SelectTwoBindingParams) {\r\n        _.each(dataSource, (item: DefaultSelectTwoModel) => {\r\n            this.attemptValueToggle(item, allBindings);\r\n        });\r\n    }\r\n\r\n    private attemptValueToggle(item: DefaultSelectTwoModel, allBindings: SelectTwoBindingParams) {\r\n        const id = allBindings.idIsString ? item.id : parseInt(item.id);\r\n\r\n        if (item.selected && !allBindings.selectedValues) {\r\n            allBindings.selectedValue(id);\r\n        }\r\n    }\r\n\r\n    // Note: Ensures the list is completely cleaned up before adding the new options. Needs to be done in this manor in order to stop duplicate \r\n    //       items from being added to the list.\r\n    private reloadTriggers(element: any, dataSource: KnockoutObservableArray<any>, allBindings: SelectTwoBindingParams) {\r\n        let ele = $(element) as any,\r\n            dataAdapter = ele.data(\"select2\").dataAdapter;\r\n\r\n        ele.empty();\r\n\r\n        // Note         :   Standard select markup requires a placeholder option in order to have a default unselected state and it turns out Select2 \r\n        //                  works in the same way. If you specify a placeholder message it only acts as an overlay to the input and doesn't actually allow\r\n        //                  an 'unselected' option even though you can clear the selected option from the UI. This becomes problematic when you have a search \r\n        //                  page (e.g.Sports Course Search) which shouldn't have an option pre-selected. With that in mind and their own documentation proving \r\n        //                  this they recommend manually adding in an 'unselected' option to the top of the list.\r\n        // Technical    :   When the list updates (e.g. loading has finished) there is no 'unselected' state so rather than leaving it upto the calling element\r\n        //                  to define this information, it's added manually. From the hidden select perspective the option is available, however in terms of select2\r\n        //                  it's hidden from view and selection. Additionally, this issue only affects single selection containers so multi - selects don't need this \r\n        //                  'unselected' option.\r\n        // Source       :   https://select2.org/placeholders\r\n        //                  https://github.com/select2/select2/issues/3553\r\n        if (allBindings.placeholderMessage && !allBindings.allowMultiple) {\r\n            dataSource.unshift({ id: \"\", text: \"\" } as DefaultSelectTwoModel);\r\n        }\r\n\r\n        dataAdapter.addOptions(dataAdapter.convertToOptions(dataSource()));\r\n        ele.trigger(\"change\");\r\n    }\r\n\r\n    // Note: Base configuration for a select2 container, use this when adding new bindings to this file.\r\n    private configureSelectContainer(element: any, dataSource: KnockoutObservableArray<any>, allBindings: SelectTwoBindingParams) {\r\n        const ele = $(element) as any;\r\n\r\n        ko.utils.domNodeDisposal.addDisposeCallback(element, () => {\r\n            if (element.data != null && element.data(\"select2\")) {\r\n                element.select2(\"select2\");\r\n            }\r\n        });\r\n\r\n        ele.select2({\r\n            data: dataSource,\r\n            dropdownAutoWidth: false,\r\n            allowClear: allBindings.allowClear,\r\n            multiple: allBindings.allowMultiple,\r\n            closeOnSelect: allBindings.closeOnSelect,\r\n            placeholder: allBindings.placeholderMessage,\r\n            minimumResultsForSearch: allBindings.minimumResultsForSearch\r\n        }).on(\"select2:select\", function (event: any) {\r\n            // Note: The IDs assigned in select2 are strings so they need to be converted to ints in \r\n            //       order to remove them from the selectedValues list. Can also be strings when the binding \r\n            //       'idIsString' is set to true in which case the values don't need to be parsed as ints\r\n\r\n            const eve: SelectTwoEventOptions = event;\r\n            const selectedId = allBindings.idIsString\r\n                ? eve.params.data.id\r\n                : parseInt(eve.params.data.id);\r\n\r\n            if (allBindings.selectedValues) {\r\n                allBindings.selectedValues.push(selectedId);\r\n            } else {\r\n                const reevaluateValue: string | number = (function () {\r\n                    if (allBindings.idIsString) {\r\n                        return selectedId;\r\n                    } else {\r\n                        return selectedId >= 0\r\n                            ? selectedId\r\n                            : null;\r\n                    }\r\n                })();\r\n\r\n                allBindings.selectedValue(reevaluateValue);\r\n            }\r\n        }).on(\"select2:unselect\", function (event: any) {\r\n            const eve: SelectTwoEventOptions = event;\r\n\r\n            //Note: The IDs assigned in select2 are strings so they need to be converted to ints in \r\n            //      order to remove them from the selectedValues list.\r\n            if (allBindings.selectedValues) {\r\n                allBindings.selectedValues.remove(parseInt(eve.params.data.id));\r\n            } else {\r\n                allBindings.selectedValue(null);\r\n            }\r\n        });\r\n\r\n        if (allBindings.selectedValues) {\r\n            allBindings.selectedValues.subscribe((newValue: number[] | string[]) => {\r\n                $(element).val(<any>newValue).trigger('change');\r\n            });\r\n        } else {\r\n            allBindings.selectedValue.subscribe((newValue?: number | string) => {\r\n                $(element).val(newValue).trigger('change');\r\n            });\r\n        }\r\n    }\r\n}\r\n\r\nvar service = new SelectTwoBindings();\r\nexport { service as SelectTwoBindings };"]}