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);
+
+    }
   }
   /**
    * Method to put annotations into JSON format and emit to parent.