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Consider a scenario where you want to populate the State drop-down list based on a value that you select in the Country drop-down list. If you select Australia in the Country drop-down list, the State drop-down list displays the states within Australia. The following procedure describes how to accomplish this task.
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Write a servlet based on the request parameter Country, which returns an array that contains the names of states within the country.
@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); } } } -
Create an adaptive form and add two drop-down lists, Country and State to it. The Country list can include the names of countries. The State list can dynamically populate the names of states for the country you select in the first list.
Add the names of countries to display in Country list. In the State list, add a script to populate it based on the name of the country in the Country list.
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);
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