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feat(location-select): location-select component
This commit adds the bh-location-select component. This component is used to select a village uuid by selecting a country, province, sector, and finally village as needed. It's useful in all pages that require location IDs to be specified. For extensive documentation, see the component code. Closes #36.
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| angular.module('bhima.directives') | ||
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| /** | ||
| * Location Selection Component - bhLocationSelect | ||
| */ | ||
| .component('bhLocationSelect', { | ||
| templateUrl : 'partials/templates/bhLocationSelect.tmpl.html', | ||
| controller : LocationSelectController, | ||
| bindings: { | ||
| locationUuid: '=', // two-way binding | ||
| disable: '<', // one-way binding | ||
| validationTrigger: '<', // one-way binding | ||
| } | ||
| }); | ||
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| LocationSelectController.$inject = [ 'LocationService', '$scope' ]; | ||
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| /** | ||
| * Location Select Controller | ||
| * | ||
| * This component allows easy selection and validation of locations to be used | ||
| * throughout bhima. | ||
| * | ||
| * COMPONENT LIFECYCLE | ||
| * | ||
| * 1. On startup, all countries are downloaded and bound the view. If a | ||
| * location-uuid was provided, the location is immediately downloaded and | ||
| * selected in the view. | ||
| * | ||
| * 2. As the user changes each <select>, the dependent <select> will fire off | ||
| * an HTTP request to load fresh data from the server. It will also clear the | ||
| * previous selections from dependent selects. | ||
| * | ||
| * 3. When the user finally selects a village, the location-uuid is updated | ||
| * with the village's uuid. | ||
| * | ||
| * BINDINGS | ||
| * | ||
| * 1. [location-uuid] : A two-way bound location uuid. The parent controller | ||
| * should expect this ID to contain the selected location. | ||
| * 2. [disable] : A hook to allow an external controller to disable the entire | ||
| * component. | ||
| * 3. [validation-trigger] : A hook to trigger validation on the component. | ||
| * Will usually be ParentForm.$submitted. | ||
| * | ||
| * @constructor | ||
| * @example | ||
| * <bh-location-select | ||
| * location-uuid="ctrl.locationId" | ||
| * validation-trigger="ParentForm.$submitted"> | ||
| * </bh-location-select> | ||
| * | ||
| */ | ||
| function LocationSelectController(Locations, $scope) { | ||
| var vm = this; | ||
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| /** loading indicator */ | ||
| vm.loading = false; | ||
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| /** methods */ | ||
| vm.loadVillages = loadVillages; | ||
| vm.loadSectors = loadSectors; | ||
| vm.loadProvinces = loadProvinces; | ||
| vm.updateLocationUuid = updateLocationUuid; | ||
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| /** disabled bindings for individual <select>s */ | ||
| vm.disabled = { | ||
| village: true, | ||
| sector: true, | ||
| province: true | ||
| }; | ||
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| /** | ||
| * <select> component messages to be translated | ||
| * if there is no data, indicate that to the user. | ||
| */ | ||
| var selectCountry = 'SELECT.COUNTRY'; | ||
| var selectProvince = 'SELECT.PROVINCE'; | ||
| var selectSector = 'SELECT.SECTOR'; | ||
| var selectVillage = 'SELECT.VILLAGE'; | ||
| var noData = 'SELECT.EMPTY'; | ||
| vm.messages = { | ||
| country: selectCountry, | ||
| province: selectVillage, | ||
| sector: selectSector, | ||
| village: selectVillage, | ||
| }; | ||
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| // load the countries once, at startup | ||
| Locations.countries() | ||
| .then(function (countries) { | ||
| vm.countries = countries; | ||
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| // if there are countries to select, show a "select a country" message | ||
| // however, if there isn't any data, show a "no data" message. This pattern | ||
| // is used throughout the component. | ||
| vm.messages.country = (countries.length > 0) ? | ||
| selectCountry : | ||
| noData; | ||
| }); | ||
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| /** load the provinces, based on the country selected */ | ||
| function loadProvinces() { | ||
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| // don't send an HTTP request if there is no country | ||
| if (!vm.country || !vm.country.uuid) { return; } | ||
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| // allow the <select> to be selected | ||
| vm.disabled.province = false; | ||
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| // load the provinces to bind to the view | ||
| Locations.provinces({ country : vm.country.uuid }) | ||
| .then(function (provinces) { | ||
| vm.provinces = provinces; | ||
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| // show the appropriate message to the user | ||
| vm.messages.province = (provinces.length > 0) ? | ||
| selectProvince : | ||
| noData; | ||
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| // clear the dependent <select> elements | ||
| vm.sectors = []; | ||
| vm.villages = []; | ||
| }); | ||
| } | ||
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| /** load the sectors, based on the province selected */ | ||
| function loadSectors() { | ||
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| // don't send an HTTP request if there is no province | ||
| if (!vm.province || !vm.province.uuid) { return; } | ||
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| // allow the <select> to be selected | ||
| vm.disabled.sector = false; | ||
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| // fetch the sectors from the server | ||
| Locations.sectors({ province : vm.province.uuid }) | ||
| .then(function (sectors) { | ||
| vm.sectors = sectors; | ||
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| // show the appropriate message to the user | ||
| vm.messages.sector = (sectors.length > 0) ? | ||
| selectSector : | ||
| noData; | ||
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| // clear the selected village | ||
| vm.villages = []; | ||
| }); | ||
| } | ||
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| /** load the villages, based on the sector selected */ | ||
| function loadVillages() { | ||
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| // don't send an HTTP request if there is no sector | ||
| if (!vm.sector || !vm.sector.uuid) { return; } | ||
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| // allow the <select> to be selected | ||
| vm.disabled.village = false; | ||
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| // fetch the villages from the server | ||
| Locations.villages({ sector : vm.sector.uuid }) | ||
| .then(function (villages) { | ||
| vm.villages = villages; | ||
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| // show the appropriate message to the user | ||
| vm.messages.village = (villages.length > 0) ? | ||
| selectVillage : | ||
| noData; | ||
| }); | ||
| } | ||
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| /** updates the exposed location uuid for the client to use */ | ||
| function updateLocationUuid() { | ||
| vm.locationUuid = vm.village.uuid; | ||
| console.log('Location updated to:', vm.locationUuid); | ||
| } | ||
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| /** | ||
| * If a location has been provided or changes, reload the datasource with the | ||
| * provided location uuid. | ||
| * @method loadLocation | ||
| * @private | ||
| */ | ||
| function loadLocation() { | ||
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| // make sure we actually have an initial location (prevents needless firing | ||
| // during $scope churn). | ||
| if (!vm.locationUuid) { return; } | ||
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| // if the location is already selected, do not reload all datasoures. This | ||
| // condition will occur when we manually called updateLocationUuid() from | ||
| // the village <select> element. | ||
| if (vm.village && vm.locationUuid === vm.village.uuid) { return; } | ||
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| // download the location to the view via the LocationService | ||
| Locations.location(vm.locationUuid) | ||
| .then(function (initial) { | ||
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| // bind initial data to each <select> elementin the view | ||
| vm.village = { | ||
| uuid : initial.villageUuid, | ||
| village : initial.village, | ||
| }; | ||
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| vm.sector = { | ||
| uuid : initial.sectorUuid, | ||
| sector : initial.sector, | ||
| }; | ||
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| vm.province = { | ||
| uuid : initial.provinceUuid, | ||
| province : initial.province, | ||
| }; | ||
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| vm.country = { | ||
| uuid : initial.countryUuid, | ||
| country : initial.country, | ||
| }; | ||
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| // refresh all data sources to allow a user to use the <select> elements. | ||
| loadVillages(); | ||
| loadSectors(); | ||
| loadProvinces(); | ||
| }); | ||
| } | ||
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| /** | ||
| * Hook up a listener to the locationUuid to reload it if it is changed | ||
| * externally. | ||
| * | ||
| * Note - this will also fire when updated internally, however loadLocation() | ||
| * should detect it and prevent unnecessary HTTP requests. | ||
| * | ||
| * In general, $scope.$watch is more inefficient than exposing an API to the | ||
| * parent controller. However, this component favors minimal controller code | ||
| * over application efficiency. This could be optimized as the application | ||
| * evolves. | ||
| */ | ||
| $scope.$watch('vm.locationUuid', loadLocation); | ||
| } |
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