text limit for tag

src/app/common-components/annotate-text/annotate-text.component.ts

@@ -54,10 +54,14 @@ export class AnnotateTextComponent implements OnInit {
       alert("The selected text is already annotated.");
       return;
     }
+    if (selection.endIndex - selection.startIndex <= 128) {
+      this.annotations = this.annotations.concat(
+        new Annotation(selection.startIndex, selection.endIndex, label, '#499bbc')
+      );
+    } else {
+      this._toast.toast('warning', 'Warning', 'Selected text is too big to be tagged.', true);
 
-    this.annotations = this.annotations.concat(
-      new Annotation(selection.startIndex, selection.endIndex, label, '#499bbc')
-    );
+    }
   }
   /**
    * Method to put annotations into JSON format and emit to parent.