动态填充下拉列表 dynamically-populating-drop-down-lists
前提条件 prerequisites
动态填充下拉列表的过程 procedure-to-dynamically-populate-drop-down-lists
假设您想要在 州 下拉列表中,根据您在 国家/地区 下拉列表。 如果在 国家/地区 下拉列表, 州 下拉列表显示澳大利亚的州。 以下过程介绍如何完成此任务。
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使用以下模块创建项目:
- 包中包含用于填充下拉列表的逻辑的包,在本例中为servlet。
- 内容,该内容嵌入了.jar文件并具有下拉资源。 Servlet指向此资源。
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根据请求参数Country编写Servlet,该参数将返回一个包含国家/地区内状态名称的数组。
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); } } }
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在应用程序的特定文件夹层次结构下创建一个下拉节点(例如,在/apps/myfolder/demo下创建一个节点)。 确保
sling:resourceType
节点的参数与servlet指向的参数相同(https://experienceleague.adobe.com/apps/populatedropdown?lang=zh-Hans)。 -
将内容节点打包并将.jar文件嵌入到特定位置(例如/apps/myfolder/demo/install/)。 在服务器上部署同一文件。
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创建一个自适应表单,并向其添加两个下拉列表(国家/地区和州)。 国家/地区列表可以包括国家/地区的名称。 “州”列表可以动态填充您在第一个列表中选择的国家/地区的州名称。
添加要在国家/地区列表中显示的国家/地区名称。 在“州”列表中,添加一个脚本,以根据“国家/地区”列表中国家/地区的名称来填充该脚本。
code language-none 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);
内容包,其中包含一个实施了上述代码的示例自适应表单(demo/AFdemo)。
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