Multiple Text - The defaultValueExpression is unavailable for multipl…

…e text items fix #7221 (#7237)

src/question_multipletext.ts

@@ -208,6 +208,15 @@ export class MultipleTextItemModel extends Base
   public set size(val: number) {
     this.editor.size = val;
   }
+  /**
+   * An expression used to calculate the [defaultValue](https://surveyjs.io/form-library/documentation/question#defaultValue).
+   */
+  public get defaultValueExpression(): string {
+    return this.editor.defaultValueExpression;
+  }
+  public set defaultValueExpression(val: string) {
+    this.editor.defaultValueExpression = val;
+  }
   /**
    * The minimum value specified as an expression. For example, `"minValueExpression": "today(-1)"` sets the minimum value to yesterday.
    */
@@ -805,6 +814,7 @@ Serializer.addClass(
       name: "requiredErrorText:text",
       serializationProperty: "locRequiredErrorText",
     },
+    { name: "defaultValueExpression:expression", visible: false },
     {
       name: "minValueExpression:expression",
       category: "logic",

tests/question_multipletexttests.ts

@@ -215,3 +215,29 @@ QUnit.test("min/maxValueExpression executing", (assert) => {
   q1.items[1].value = 5;
   assert.equal(q1.items[1].editor.hasErrors(), true);
 });
+QUnit.test("defaultValueExpression executing", (assert) => {
+  const survey = new SurveyModel({
+    questions: [
+      {
+        type: "multipletext",
+        name: "q1",
+        items: [
+          {
+            name: "item1"
+          },
+          {
+            name: "item2"
+          },
+          {
+            name: "item3",
+            defaultValueExpression: "{q1.item1} + {q1.item2}"
+          }
+        ]
+      }
+    ]
+  });
+  const q1 = <QuestionMultipleTextModel>survey.getQuestionByName("q1");
+  q1.items[0].value = 10;
+  q1.items[1].value = 5;
+  assert.equal(q1.items[2].editor.value, 15, "Calculated correctly");
+});