Dropdown selection in updatepanel causes full postback in sharepoint 2013 webpart

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Hi,

I am facing problem while using Two Dropdownlist inside a Multiview control in SharePoint 2013 Webpart.

My first dropdown list autopostback on selection of any item and it binds item in second dropdown list.

But in Chrome and Firefox browsers, its causing problem.. It postback whole page if i left page idle for 2 minutes only and then select any item from first dropdownlist.

Can any one provide me a direction to resolve this issue as i have tried multiple things to resolve but not able to resolve it.

Thanks,
Amul

What I have tried:

I have changed mode of update panel to Always or Conditional. I have also added dropdown list as async trigger but nothing had worked for me.

Posted 21-Nov-16 0:01am

Amul Kumar

Updated 21-Nov-16 0:32am

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Amul Kumar · Answer 1 · 2016-11-21T00:32:00

This is my code

<asp:updatepanel id="UPDPanel1" runat="server" updatemode="Always" childrenastriggers="true">
<%-- <triggers> <asp:asyncpostbacktrigger controlid="DrpFunctionality" eventname="SelectedIndexChanged">
--%>
<contenttemplate>

<%--<asp:panel id="panel1" runat="server" visible="true">--%>

<asp:dropdownlist id="DrpFunctionality" enableviewstate="true" clientidmode="Inherit" runat="server" cssclass="inp" width="100%" onselectedindexchanged="DrpFunctionality_SelectedIndexChanged" autopostback="true">
<asp:requiredfieldvalidator id="ReqFVFunctionality" setfocusonerror="true" forecolor="Red" runat="server" initialvalue="Select Functionality" controltovalidate="DrpFunctionality" errormessage="Functionality Required" validationgroup="Submit" display="Dynamic">

<asp:dropdownlist id="DrpSubFunctionality" enableviewstate="true" clientidmode="Inherit" runat="server" cssclass="inp" width="100%" autopostback="true">
<asp:requiredfieldvalidator id="ReqFVFun" setfocusonerror="true" forecolor="Red" runat="server" initialvalue="Select Sub-Functionality" controltovalidate="DrpSubFunctionality" errormessage="Sub-Functionality Required" validationgroup="Submit" display="Dynamic">

<asp:dropdownlist id="DrpEndUse" runat="server" enableviewstate="true" cssclass="inp" width="100%" onselectedindexchanged="DrpEndUse_SelectedIndexChanged" autopostback="true">
<asp:requiredfieldvalidator id="ReqFVEndUse" setfocusonerror="true" forecolor="Red" runat="server" initialvalue="Select End Use" controltovalidate="DrpEndUse" errormessage="End Use Required" validationgroup="Submit" display="Dynamic">

<asp:dropdownlist id="DrpSubEndUse" runat="server" enableviewstate="true" cssclass="inp" width="100%" autopostback="true">

<asp:requiredfieldvalidator id="ReqFVSubEndUse" setfocusonerror="true" forecolor="Red" runat="server" initialvalue="Select Sub-End Use" controltovalidate="DrpSubEndUse" errormessage="Sub-End Use Required" validationgroup="Submit" display="Dynamic">

<asp:dropdownlist id="DrpSolution" enableviewstate="true" runat="server" cssclass="inp" width="100%" onselectedindexchanged="DrpSolution_SelectedIndexChanged" autopostback="true">
<asp:requiredfieldvalidator id="ReqFVSolution" setfocusonerror="true" forecolor="Red" runat="server" initialvalue="Select Solution" controltovalidate="DrpSolution" errormessage="Solution Required" validationgroup="Submit" display="Dynamic">

<asp:dropdownlist id="DrpSubSolution" enableviewstate="true" runat="server" cssclass="inp" width="100%">

<asp:requiredfieldvalidator id="ReqFVSubSol" setfocusonerror="true" forecolor="Red" runat="server" initialvalue="Select Sub-Solution" controltovalidate="DrpSubSolution" errormessage="Sub-Solution Required" validationgroup="Submit" display="Dynamic">

<%----%>