data-native-menu="false" and window.location not working

data-native-menu="false" and window.location not working

Hi i have drop down box , im redirecting page on onchange event of dropdown but i noticed it is wokring only IE adn not in FF and chrome.if i remove data-native-menu="false" then it is working fine on all browsers.
here is my code:
  1.  <asp:DropDownList name="country" ID="ddlCountry" runat="server" class="country"  data-native-menu="false"    style="white-space:normal";   onchange="javascript:window.location.href=this.options[this.selectedIndex].value;"         >
                     
                    </asp:DropDownList>


Could somebody please help me what should i do to work it with data native false