text passage selection now has a default value if there is only 1 citation level

src/pages/corpus-detail/corpus-detail.ts

@@ -41,6 +41,9 @@ export class CorpusDetailPage {
         if (Object.keys(this.corpusProvider.currentCorpus.citations).length === 0) {
             this.addReferences(this.corpusProvider.currentCorpus.citation_level_1);
         }
+        else {
+            this.initReffDisplay();
+        }
         this.translateService.get("INVALID_TEXT_RANGE").subscribe((value) => {
             this.invalidTextRangeString = value;
         });
@@ -178,6 +181,9 @@ export class CorpusDetailPage {
                     this.corpusProvider.currentCorpus.citations[relevantCitationIndices[0]].subcitations[relevantCitationIndices[1]].subcitations[citation.value] = citation;
                 }
             });
+            if (targetCitationLevel === this.corpusProvider.currentCorpus.citation_level_1) {
+                this.initReffDisplay();
+            }
         });
         // , (error: HttpErrorResponse) => {
         //         // no further references available, go to text display
@@ -203,4 +209,15 @@ export class CorpusDetailPage {
         await new Promise(resolve => setTimeout(resolve, 50));
         this.areReffEditable = true;
     }
+
+    private initReffDisplay() {
+        if (this.corpusProvider.currentCorpus.citation_level_2 === CitationLevel[CitationLevel.default] && !(this.corpusProvider.currentTextRange.start[0] || this.corpusProvider.currentTextRange.end[0])) {
+            let availableCitationValues: number[] = Object.keys(this.corpusProvider.currentCorpus.citations).map(Number);
+            let lowestValue: number = Math.min.apply(Math, availableCitationValues);
+            if (this.corpusProvider.currentCorpus.citations[lowestValue]) {
+                this.corpusProvider.currentTextRange.start[0] = this.corpusProvider.currentCorpus.citations[lowestValue].value;
+                this.corpusProvider.currentTextRange.end[0] = this.corpusProvider.currentCorpus.citations[lowestValue].value;
+            }
+        }
+    }
 }

src/pages/preview/preview.ts

@@ -22,7 +22,7 @@ import {HelperProvider} from "../../providers/helper/helper";
     templateUrl: 'preview.html',
 })
 export class PreviewPage {
-    private instructionsFillTheGapString: string;
+    public instructionsFillTheGapString: string;
     FileType = FileType;
     FeedBackPage = FeedbackPage;
     ExerciseTypeTranslation = ExerciseTypeTranslation;