Added anchors so this example can be included on devsite. (#9)

Author: diminishedprime

stepped-config/src/dynamic.js

@@ -0,0 +1,75 @@
+// [start get_config_branching_paths]
+var cc = DataStudioApp.createCommunityConnector();
+
+function getConfig(request) {
+  var configParams = request.configParams;
+  // For the initial getConfig request, request.configParams will be undefined.
+  // For subsequent requests, it'll include the configuration so far.
+  var isFirstRequest = configParams === undefined;
+  var config = cc.getConfig();
+
+  config
+    .newSelectSingle()
+    .setId('country')
+    .setName('Country')
+    // Set isDynamic to true so any changes to Country will clear the state
+    // selections.
+    .setIsDynamic(true)
+    .addOption(
+      config
+        .newOptionBuilder()
+        .setLabel('United States')
+        .setValue('USA')
+    )
+    .addOption(
+      config
+        .newOptionBuilder()
+        .setLabel('Canada')
+        .setValue('CA')
+    );
+
+  if (isFirstRequest) {
+    // Tell DS that this is a stepped config request. This will make the 'NEXT'
+    // button show.
+    config.setIsSteppedConfig(true);
+  } else {
+    // validate a valid value was selected for configParams.country
+    if (configParams.country === undefined) {
+      cc.newUserError()
+        .setText('You must choose a country.')
+        .throwException();
+    }
+    switch (configParams.country) {
+      case 'USA': {
+        config
+          .newSelectSingle()
+          .setId('state')
+          .setName('State')
+          .addOption(
+            config
+              .newOptionBuilder()
+              .setLabel('New York')
+              .setValue('NY')
+          )
+          .addOption(
+            config
+              .newOptionBuilder()
+              .setLabel('Calfornia')
+              .setValue('CA')
+          );
+        break;
+      }
+      case 'CA': {
+        // No additional configuration is needed for Canada.
+        break;
+      }
+      default: {
+        cc.newUserError()
+          .setText('You must either select "CA" or "USA"')
+          .throwException();
+      }
+    }
+  }
+  return config.build();
+}
+// [end get_config_branching_paths]

stepped-config/src/main.js

@@ -1,10 +1,11 @@
-var cc = DataStudioApp.createCommunityConnector();
-
 // https://developers.google.com/datastudio/connector/reference#isadminuser
 function isAdminUser() {
   return false;
 }
 
+// [start get_config_dynamic_dropdowns]
+var cc = DataStudioApp.createCommunityConnector();
+
 function optionsForState(state) {
   switch (state) {
     case 'IL': {
@@ -83,6 +84,7 @@ function getConfig(request) {
   }
   return config.build();
 }
+// [end get_config_dynamic_dropdowns]
 
 function getFields() {
   var fields = cc.getFields();