Post back trigger problem in aspx page

Question

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Hi Experts,

I have got one strange problem.
In one of my aspx page i have got file uploading control.
for this am adding save button in update panel post back trigger.
My sample code

ASP.NET

<asp:UpdatePanel ID="udpSearch" runat="server" UpdateMode="Conditional">
<table>
<tr>
<td>
<asp:Button ID="btnSave" runat="server" />
</td>
</tr>
</table>
<Triggers>
<asp:PostBackTrigger ControlID="btnSave" />
</Triggers>

But on clicking save button the entire page is blinking .
so can any one please help me to solve this issue.

thanks in advance
(Keerthi Kumar)

Posted 18-Jul-14 19:05pm

Keerthi Kumar(Andar)

Updated 2-Apr-20 23:25pm

Kornfeld Eliyahu Peter

v3

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Comments

abdul subhan mohammed 20-Jul-14 16:12pm

Can u plz expand it more,
means,
what u want to do after clicking on d save button,
or how many save buttons are there separate for each line like in grid or repeater,
or how it is.

Keerthi Kumar(Andar) 21-Jul-14 1:05am

My Page design is something like this
Onlick of Save button page is looking like blinkd one

<asp:UpdatePanel ID="udpSearch" runat="server" UpdateMode="Conditional">
<contenttemplate>
<table>
<tr>
<td>
<asp:Button ID="btnSave" runat="server" />
</td>
</tr>
</table>

<Triggers>
<asp:PostBackTrigger ControlID="btnSave" />
</Triggers>

DamithSL 21-Jul-14 1:22am

remove the post back trigger and try again.

Keerthi Kumar(Andar) 21-Jul-14 1:24am

I have added post back trigger purposefully. Because am using file upload control in this page. If i remove post back trigger its working fine...but i want post back trigger in my page.

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*dan!sh* · Answer 1 · 2014-07-20T19:32:00

Solution 1

I guess you are looking for AsyncPostBackTrigger.

Posted 20-Jul-14 19:32pm

dan!sh

Comments

Keerthi Kumar(Andar) 21-Jul-14 1:34am

ya... Is it possible to use file uploading control without using postback trigger???

dan!sh 21-Jul-14 1:43am

Yes it is. In fact standard FileUpload control does not really support partial postback from what I remember.

Keerthi Kumar(Andar) 21-Jul-14 1:50am

can u please tell me how to upload a image using file upload control.
without using post back trigger on upload button

dan!sh 21-Jul-14 1:52am

Just don't use any update panel. Why do you want update panel anyways?

Keerthi Kumar(Andar) 21-Jul-14 1:57am

am using some code behind validation in this page.
If don't use update panel for each and every request page is not looking good that's why
am using update panel

dan!sh 21-Jul-14 1:59am

take a look at ajax file upload control. I guess that is what you are looking for.

DamithSL · Answer 2 · 2014-07-20T19:33:00

Solution 2

check below article
File Upload in Update Panel[^]

Posted 20-Jul-14 19:33pm

DamithSL

Comments

Keerthi Kumar(Andar) 21-Jul-14 1:40am

Same thing am doing.
But on click of save button.once the page will look as a blank page.
then the controls will appear on the page.

DamithSL 21-Jul-14 1:44am

it is not the same, check below lines
<asp:PostBackTrigger ControlID="btnUpload" />
<asp:AsyncPostBackTrigger ControlID="btnProcessData" />

Keerthi Kumar(Andar) 21-Jul-14 1:48am

<asp:AsyncPostBackTrigger ControlID="btnProcessData" />
this used to show uploading is under process.

DamithSL 21-Jul-14 2:03am

do the same in what you doing in btnSave currently on AsyncPostBackTrigger.

Keerthi Kumar(Andar) 21-Jul-14 2:24am

if i use AsyncPostBackTrigger on btnSave Button click
I am not getting file uploaded path in code behind

Kornfeld Eliyahu Peter · Answer 3 · 2014-07-20T19:35:00

Solution 3

Your UpdatePanel not formatted as it should be...http://msdn.microsoft.com/en-us/library/system.web.ui.updatepanel(v=vs.110).aspx[^]
you missing the ContentTemplate part...

ASP.NET

<asp:updatepanel id="udpSearch" runat="server" updatemode="Conditional">
  <contenttemplate>
    <table>
      <tr>
        <td>
          <asp:button id="btnSave" runat="server" />
        </td>
      </tr>
    </table>
  </contenttemplate>
  <triggers>
    <asp:postbacktrigger controlid="btnSave" />
  </triggers>
</asp:updatepanel>

Posted 20-Jul-14 19:35pm

Kornfeld Eliyahu Peter

Updated 20-Jul-14 20:13pm

v3

Comments

Keerthi Kumar(Andar) 21-Jul-14 1:46am

xmlns:asp="#unknown" this property is not supporting in VS2008
Its giving below mentioned Error
Error 2 Type 'System.Web.UI.UpdatePanel' does not have a public property named 'xmlns:asp'.

Kornfeld Eliyahu Peter 21-Jul-14 1:49am

That's a copy-paste error...See fixed sample...

Keerthi Kumar(Andar) 21-Jul-14 1:53am

Im sorry sir. am already using <contenttemplate>
but while posting a code i forgot to add </contenttemplate>

Kornfeld Eliyahu Peter 21-Jul-14 2:16am

In that case you missed something, as the code as it presented do partial post back and not full page post!!!

SofiaSoftware · Answer 4 · 2020-04-02T23:27:00

<asp:updatepanel id="udpSearch" runat="server" updatemode="Conditional">
  <contenttemplate>
    <table>
      <tr>
        <td>
          <asp:button id="btnSave" runat="server" />
        </td>
      </tr>
    </table>
  </contenttemplate>
  <triggers>
    <asp:postbacktrigger controlid="btnSave" />
  </triggers>
</asp:updatepanel>

Post back trigger problem in aspx page

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