diff --git a/edit-mode/function/ganttEvent.js b/edit-mode/function/ganttEvent.js
index 3aa4710..76f5914 100644
--- a/edit-mode/function/ganttEvent.js
+++ b/edit-mode/function/ganttEvent.js
@@ -10,6 +10,7 @@ gantt.attachEvent("onAfterTaskAdd", function (id, item) {
             gantt.updateTask(parentId);
         }
     }
+    updateRange();
 });
 
 gantt.attachEvent("onTaskRowClick", function (id, row) {
@@ -40,7 +41,16 @@ gantt.ext.inlineEditors.attachEvent("onBeforeEditStart", function (state) {
     }
     return true
 });
-
+function updateRange(){
+    var range = gantt.getSubtaskDates();
+    var chart = gantt.getState();
+    if(range.start_date.valueOf() <= chart.min_date.valueOf() || range.end_date.valueOf() >= chart.max_date.valueOf()){
+    gantt.config.start_date = gantt.date.add(range.start_date, -1, "day");
+    gantt.config.end_date = gantt.date.add(range.end_date, 2, "day");
+    gantt.render();
+    }
+}
+gantt.attachEvent("onAfterTaskUpdate", updateRange);
 gantt.attachEvent("onBeforeTaskUpdate", function (id, new_item) {
     // format progress
     let progress = new_item.progress;
@@ -183,4 +193,4 @@ gantt.attachEvent("onGanttScroll", function (left, top){
         },20)
     }
 }
-});
\ No newline at end of file
+});