update

src/case/combo/textvaluedownlistcombo/combo.textvaluedownlist.js

@@ -44,13 +44,19 @@ BI.TextValueDownListCombo = BI.inherit(BI.Widget, {
         });
 
         this.combo.on(BI.DownListCombo.EVENT_CHANGE, function () {
-            self.setValue(self.combo.getValue()[0].value);
+            var currentVal = self.combo.getValue()[0].value;
+            if (currentVal !== self.value) {
+                self.setValue(currentVal);
                 self.fireEvent(BI.TextValueDownListCombo.EVENT_CHANGE);
+            }
         });
 
         this.combo.on(BI.DownListCombo.EVENT_SON_VALUE_CHANGE, function () {
-            self.setValue(self.combo.getValue()[0].childValue);
+            var currentVal = self.combo.getValue()[0].childValue;
+            if (currentVal !== self.value) {
+                self.setValue(currentVal);
                 self.fireEvent(BI.TextValueDownListCombo.EVENT_CHANGE);
+            }
         });
     },
 
@@ -69,6 +75,7 @@ BI.TextValueDownListCombo = BI.inherit(BI.Widget, {
     },
 
     _digest: function (v) {
+        this.value = v;
         return this.valueMap[v];
     },