sitecore - __doPostBack is not defined for mobile site only -

i getting error "__dopostback not defined error" while using asp:linkbutton on mobile site based on "jqyerymobile". not getting error on desktop site.

<asp:linkbutton runat="server" id="btnsubmit" cssclass="blue-button" onclick="btnsubmit_click" data-ajax="false">submit</asp:linkbutton> 

and have javascript validation below

    ('.blue-button').click(function () {       // javascript code     } 

i have tried many solutions not working me. can please tell me whether "jquerymobile" problem or else?

did enable caching on sublayouts mobile site? can interfere _dopostback, seen in question: sitecore: turning on html caching blocks postback behavior

this issue browser definitions in version of .net. if browser using unknown .net, acts if device not understand javascript: https://briancaos.wordpress.com/2013/10/30/javascript-referenceerror-cant-find-variable-__dopostback/