diff --git a/designer-base/src/main/java/com/fr/design/javascript/JSContentPane.java b/designer-base/src/main/java/com/fr/design/javascript/JSContentPane.java
index cd6e01df3..da0910126 100644
--- a/designer-base/src/main/java/com/fr/design/javascript/JSContentPane.java
+++ b/designer-base/src/main/java/com/fr/design/javascript/JSContentPane.java
@@ -21,6 +21,8 @@ import com.fr.general.IOUtils;
 
 import javax.swing.*;
 import java.awt.*;
+import java.awt.event.FocusEvent;
+import java.awt.event.FocusListener;
 import java.awt.event.MouseAdapter;
 import java.awt.event.MouseEvent;
 import java.util.ArrayList;
@@ -82,6 +84,28 @@ public class JSContentPane extends BasicPane {
         UIScrollPane sp = new UIScrollPane(contentTextArea);
         this.add(sp, BorderLayout.CENTER);
 
+        contentTextArea.addFocusListener(new FocusListener() {
+            @Override
+            public void focusGained(FocusEvent e) {
+                if (ac == null) {
+                    CompletionProvider provider = createCompletionProvider();
+                    ac = new AutoCompletion(provider);
+                    String shortCuts = DesignerEnvManager.getEnvManager().getAutoCompleteShortcuts();
+
+                    ac.setTriggerKey(convert2KeyStroke(shortCuts));
+                    ac.install(contentTextArea);
+                }
+            }
+
+            @Override
+            public void focusLost(FocusEvent e) {
+                if (ac != null) {
+                    ac.uninstall();
+                    ac = null;
+                }
+            }
+        });
+
         UILabel funNameLabel2 = new UILabel();
         funNameLabel2.setText("}");
         this.add(funNameLabel2, BorderLayout.SOUTH);
@@ -97,24 +121,10 @@ public class JSContentPane extends BasicPane {
     }
 
     public void populate(String js) {
-        if (ac == null) {
-            CompletionProvider provider = createCompletionProvider();
-            ac = new AutoCompletion(provider);
-            String shortCuts = DesignerEnvManager.getEnvManager().getAutoCompleteShortcuts();
-
-            ac.setTriggerKey(convert2KeyStroke(shortCuts));
-            ac.install(contentTextArea);
-        }
-
         this.contentTextArea.setText(js);
     }
 
     public String update() {
-        if (ac != null) {
-            this.ac.uninstall();
-            ac = null;
-        }
-
         return this.contentTextArea.getText();
     }