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Asked: 2026-05-11T14:39:38+00:00

I followed several web resources to understand how to show a popup from client

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I followed several web resources to understand how to show a popup from client side, and I made this code:

<asp:ImageButton runat='server' ID='btnOk' ImageUrl='imagens/btnAlterar.gif' OnClientClick='btnOkClick()' />  <asp:LinkButton runat='server' ID='dummyForPopup' Visible='false'/>  <ajaxToolKit:ModalPopupExtender runat='server' BehaviorID='btnOkPopupBehavior' ID='MPXtender' TargetControlID='dummyForPopup'  PopupControlID='pnlUpdateUserModal' BackgroundCssClass='modalBackground' OkControlID='btnCloseRequestUserUpdate' OnOkScript='userUpdReq_onOk()' />   function btnOkClick() {     if(validateAll())     {         var behavior = $find('btnOkPopupBehavior');         if (behavior)         {             behavior.show();         }         else         {             var lblOutput = $get('<%= lblOutput .ClientID %>');             lblOutput .innerText = 'Couldn't find popup';         }     } }

previously I had the modal popup linked to the ok button, it was working pretty well. Now I need some validation before opening the popup, and this code is not working anylonger =/

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1 Answer

  1. 1) Your dummy button has to be visible = true, otherwise the javascript doesn’t work properly. So set visible = true but disaply none with css:

     <asp:LinkButton runat='server'  ID='dummyForPopup' style  ='display:none' Visible='true' />

    2) lblOutput .innerText = ‘Couldn’t find popup’; is a javascript error. You need to change it to: ‘Couldn’t find popup’; (or use &apos;)

    3) OnClientClick=’btnOkClick()’ should really say: OnClientClick=’btnOkClick(); return false;’

    4) Look for any other javascript errors on your page because those will stop the popup from workign properly.

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