Add survey.onDynamicPanelCurrentIndexChanged event fix #7513

src/base-interfaces.ts

@@ -219,6 +219,7 @@ export interface ISurvey extends ITextProcessor, ISurveyErrorOwner {
   dynamicPanelRemoving(question: IQuestion, panelIndex: number, panel: IPanel): boolean;
   dynamicPanelItemValueChanged(question: IQuestion, options: any): any;
   dynamicPanelGetTabTitle(question: IQuestion, options: any): any;
+  dynamicPanelCurrentIndexChanged(question: IQuestion, options: any): void;
 
   dragAndDropAllow(options: DragDropAllowEvent): boolean;
 

src/question_paneldynamic.ts

@@ -555,14 +555,22 @@ export class QuestionPanelDynamicModel extends Question
   public set currentPanel(val: PanelModel) {
     if(this.isRenderModeList || this.useTemplatePanel) return;
     const curPanel = this.getPropertyValue("currentPanel");
-    if(!!val && this.visiblePanels.indexOf(val) < 0 || val === curPanel) return;
+    const index = !!val ? this.visiblePanels.indexOf(val) : -1;
+    if(!!val && index < 0 || val === curPanel) return;
     if(curPanel) {
       curPanel.onHidingContent();
     }
     this.setPropertyValue("currentPanel", val);
     this.updateFooterActions();
     this.updateTabToolbarItemsPressedState();
     this.fireCallback(this.currentIndexChangedCallback);
+    if(index > -1 && this.survey) {
+      const options = {
+        panel: val,
+        visiblePanelIndex: index
+      };
+      this.survey.dynamicPanelCurrentIndexChanged(this, options);
+    }
   }
   public onHidingContent(): void {
     super.onHidingContent();

src/survey-events-api.ts

@@ -810,15 +810,17 @@ export interface DynamicPanelItemValueChangedEvent extends PanelDynamicQuestionE
    */
   panel: PanelModel;
 }
-export interface DynamicPanelGetTabTitleEvent extends PanelDynamicQuestionEventMixin {
+export interface DynamicPanelCurrentIndexChangedEvent extends PanelDynamicQuestionEventMixin {
   /**
-   * A panel whose tab title is being rendered.
+   * A panel for which the event is raised.
    */
   panel: PanelModel;
   /**
    * The panel's index in the [`visiblePanels`](https://surveyjs.io/form-library/documentation/api-reference/dynamic-panel-model#visiblePanels) array of the Dynamic Panel.
    */
   visiblePanelIndex: number;
+}
+export interface DynamicPanelGetTabTitleEvent extends DynamicPanelCurrentIndexChangedEvent {
   /**
    * A tab title. You can change this parameter's value.
    */

src/survey.ts

@@ -61,9 +61,9 @@ import {
   ShowingChoiceItemEvent, ChoicesLazyLoadEvent, GetChoiceDisplayValueEvent, MatrixRowAddedEvent, MatrixBeforeRowAddedEvent, MatrixRowRemovingEvent, MatrixRowRemovedEvent,
   MatrixAllowRemoveRowEvent, MatrixCellCreatingEvent, MatrixCellCreatedEvent, MatrixAfterCellRenderEvent, MatrixCellValueChangedEvent, MatrixCellValueChangingEvent,
   MatrixCellValidateEvent, DynamicPanelModifiedEvent, DynamicPanelRemovingEvent, TimerPanelInfoTextEvent, DynamicPanelItemValueChangedEvent, DynamicPanelGetTabTitleEvent,
-  IsAnswerCorrectEvent, DragDropAllowEvent, ScrollingElementToTopEvent, GetQuestionTitleActionsEvent, GetPanelTitleActionsEvent, GetPageTitleActionsEvent,
-  GetPanelFooterActionsEvent, GetMatrixRowActionsEvent, ElementContentVisibilityChangedEvent, GetExpressionDisplayValueEvent, ServerValidateQuestionsEvent,
-  MultipleTextItemAddedEvent, MatrixColumnAddedEvent, GetQuestionDisplayValueEvent, PopupVisibleChangedEvent
+  DynamicPanelCurrentIndexChangedEvent, IsAnswerCorrectEvent, DragDropAllowEvent, ScrollingElementToTopEvent, GetQuestionTitleActionsEvent, GetPanelTitleActionsEvent,
+  GetPageTitleActionsEvent, GetPanelFooterActionsEvent, GetMatrixRowActionsEvent, ElementContentVisibilityChangedEvent, GetExpressionDisplayValueEvent,
+  ServerValidateQuestionsEvent, MultipleTextItemAddedEvent, MatrixColumnAddedEvent, GetQuestionDisplayValueEvent, PopupVisibleChangedEvent
 } from "./survey-events-api";
 import { QuestionMatrixDropdownModelBase } from "./question_matrixdropdownbase";
 import { QuestionMatrixDynamicModel } from "./question_matrixdynamic";
@@ -745,6 +745,11 @@ export class SurveyModel extends SurveyElementCore
    */
   public onGetDynamicPanelTabTitle: EventBase<SurveyModel, DynamicPanelGetTabTitleEvent> = this.addEvent<SurveyModel, DynamicPanelGetTabTitleEvent>();
 
+  /**
+   * An event that is raised after the current panel is changed in a [Dynamic Panel](https://surveyjs.io/form-library/examples/questiontype-paneldynamic/) question.
+   */
+  public onDynamicPanelCurrentIndexChanged: EventBase<SurveyModel, DynamicPanelCurrentIndexChangedEvent> = this.addEvent<SurveyModel, DynamicPanelCurrentIndexChangedEvent>();
+
   /**
    * An event that is raised to define whether a question answer is correct. Applies only to [quiz surveys](https://surveyjs.io/form-library/documentation/design-survey/create-a-quiz).
    */
@@ -4929,6 +4934,10 @@ export class SurveyModel extends SurveyElementCore
     options.question = question;
     this.onGetDynamicPanelTabTitle.fire(this, options);
   }
+  dynamicPanelCurrentIndexChanged(question: IQuestion, options: any): void {
+    options.question = question;
+    this.onDynamicPanelCurrentIndexChanged.fire(this, options);
+  }
   dragAndDropAllow(options: DragDropAllowEvent): boolean {
     this.onDragDropAllow.fire(this, options);
     return options.allow;

tests/question_paneldynamic_tests.ts

@@ -5889,6 +5889,44 @@ QUnit.test("templateVisibleIf && currentPanelIndex", function (assert) {
   assert.equal(panel.visiblePanelCount, 1, "There is one panel");
   assert.equal(panel.currentIndex, 0, "currentIndex #8");
 });
+QUnit.test("survey.onDynamicPanelCurrentIndexChanged", function (assert) {
+  const survey = new SurveyModel();
+  let questionName = "";
+  let panelIndex = -2;
+  let panelIndexOf = -2;
+  survey.onDynamicPanelCurrentIndexChanged.add((_, options) => {
+    questionName = options.question.name;
+    panelIndex = options.visiblePanelIndex;
+    panelIndexOf = !!options.panel ? options.question.visiblePanels.indexOf(options.panel) : -1;
+  });
+  survey.fromJSON({
+    elements: [
+      { type: "paneldynamic",
+        name: "panel",
+        templateElements: [
+          { type: "text", name: "q1" },
+          { type: "text", name: "q2" }
+        ],
+        panelCount: 3,
+        renderMode: "tab"
+      }],
+  });
+  assert.equal(questionName, "panel", "question is correct");
+  assert.equal(panelIndex, 0, "panelIndex #1");
+  assert.equal(panelIndexOf, 0, "panelIndexOf #1");
+  const panel = <QuestionPanelDynamicModel>survey.getQuestionByName("panel");
+  panel.currentIndex = 1;
+  assert.equal(panelIndex, 1, "panelIndex #2");
+  assert.equal(panelIndexOf, 1, "panelIndexOf #2");
+  panel.addPanel();
+  assert.equal(panel.currentIndex, 3, "panel.panelIndex #3");
+  assert.equal(panelIndex, 3, "panelIndex #3");
+  assert.equal(panelIndexOf, 3, "panelIndexOf #3");
+  panel.removePanel(3);
+  assert.equal(panel.currentIndex, 2, "panel.panelIndex #4");
+  assert.equal(panelIndex, 2, "panelIndex #4");
+  assert.equal(panelIndexOf, 2, "panelIndexOf #4");
+});
 QUnit.test("templateVisibleIf & renderMode: tab, additionalTitleToolbar&templateTabTitle in JSON", function (assert) {
   const survey = new SurveyModel({
     elements: [