動態填入下拉式清單 dynamically-populating-drop-down-lists
先決條件 prerequisites
動態填入下拉式清單的程式 procedure-to-dynamically-populate-drop-down-lists
假設您想要根據您在 國家 下拉式清單中選取的值填入 國家 下拉式清單。 如果您在 國家 下拉式清單中選取「澳洲」，國家 下拉式清單會顯示澳洲境內的國家。 下列程式說明如何完成此工作。
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建立包含下列模組的專案：
- 包含邏輯以填入下拉式清單（在此例中為servlet）的套件組合。
- 內嵌.jar檔案且具有下拉式資源的內容。 此servlet指向此資源。
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根據請求引數Country編寫servlet，該引數會傳回包含該國家/地區內州名的陣列。
code language-java @Component(metatype = false) @Service(value = Servlet.class) @Properties({ @Property(name = "sling.servlet.resourceTypes", value = "/apps/populatedropdown"), @Property(name = "sling.servlet.methods", value = {"GET", "POST"}), @Property(name = "service.description", value = "Populate states dropdown based on country value") }) public class DropDownPopulator extends SlingAllMethodsServlet { private Logger logger = LoggerFactory.getLogger(DropDownPopulator.class); protected void doPost(SlingHttpServletRequest request, final SlingHttpServletResponse response) throws ServletException, IOException { response.setHeader("Access-Control-Allow-Origin", "*"); response.setContentType("application/json"); response.setCharacterEncoding("UTF-8"); try { String US_STATES[] = {"0=Alabama", "1=Alaska", "2=Arizona", "3=Arkansas", "4=California", "5=Colorado", "6=Connecticut", "7=Delaware", "8=Florida", "9=Georgia", "10=Hawaii", "11=Idaho", "12=Illinois", "13=Indiana", "14=Iowa", "15=Kansas", "16=Kentucky", "17=Louisiana", "18=Maine", "19=Maryland", "20=Massachusetts", "21=Michigan", "22=Minnesota", "23=Mississippi", "24=Missouri", "25=Montana", "26=Nebraska", "27=Nevada", "28=New Hampshire", "29=New Jersey", "30=New Mexico", "31=New York", "32=North Carolina", "33=North Dakota", "34=Ohio", "35=Oklahoma", "36=Oregon", "37=Pennsylvania", "38=Rhode Island", "39=South Carolina", "40=South Dakota", "41=Tennessee", "42=Texas", "43=Utah", "44=Vermont", "45=Virginia", "46=Washington", "47=West Virginia", "48=Wisconsin", "49=Wyoming"}; String AUSTRALIAN_STATES[] = {"0=Ashmore and Cartier Islands", "1=Australian Antarctic Territory", "2=Australian Capital Territory", "3=Christmas Island", "4=Cocos (Keeling) Islands", "5=Coral Sea Islands", "6=Heard Island and McDonald Islands", "7=Jervis Bay Territory", "8=New South Wales", "9=Norfolk Island", "10=Northern Territory", "11=Queensland", "12=South Australia", "13=Tasmania", "14=Victoria", "15=Western Australia"}; String country = request.getParameter("country"); JSONArray stateJsonArray = new JSONArray(); if (country.length() > 0) { if ("australia".equalsIgnoreCase(country)) { stateJsonArray = new JSONArray(); for (String state : AUSTRALIAN_STATES) { stateJsonArray.put(state); } } else if ("unitedstates".equalsIgnoreCase(country)) { stateJsonArray = new JSONArray(); for (String state : US_STATES) { stateJsonArray.put(state); } } response.setContentType("application/json"); response.getWriter().write(stateJsonArray.toString()); } } catch ( Exception e) { logger.error(e.getMessage(), e); } } } -
在應用程式中的特定資料夾階層下建立下拉式節點（例如，在/apps/myfolder/demo下建立節點）。 確定節點的
sling:resourceType引數與servlet指向的引數相同(https://experienceleague.adobe.com/apps/populatedropdown?lang=zh-Hant)。
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封裝內容節點並將.jar檔案內嵌於特定位置（例如/apps/myfolder/demo/install/）。 在伺服器上部署相同的檔案。
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建立最適化表單，並在其中新增兩個下拉式清單：國家/地區和州。 國家/地區清單可包含國家/地區的名稱。 「州」清單可動態填入您在第一個清單中所選國家/地區的州名。
新增要在國家/地區清單中顯示的國家/地區名稱。 在「州」清單中，新增指令碼，以根據「國家/地區」清單中的國家/地區名稱填入指令碼。
code language-javascript JSON.parse( $.ajax({ url: "/apps/myfolder/demo/dropdown", type: "POST", async: false, data: {"country": country.value}, success: function(res){}, error : function (message) { guideBridge._guide.logger().log(message); successFlag = false; } }) .responseText);
內容套件包含實施上述程式碼的範例最適化表單（示範/AFdemo）。