Hello.

I am having some trouble with the PopupControlExtender. I have a Panel (panel 1) that contains some text and a button (button 1). I have another button (button 2) that I want to cause the panel to popup. I set the popupControlExtender TargetControlID as button 2 and the PopupControlID as the Panel.

When I click button 2 the panel appears as expected but if I now click button 1 that is on the panel (i.e. causing a postback) I get a "this._postbackSettings.async is null or not an object"javascript error.

Does anyone have any ideas that can help?

Thanks!

Ian

 

Interesting. A link button does indeed work.

I just tried an image button and that doesn't work.

Is this a known issue with the PopupControlExtender?

 
Ideally I want to use an image button

Thanks
Ian

I am getting the same javascript error in a different circumstance.

I have modal dialogs and will set the tabIndex so the "Accept" button is selected, and when the user types in to the textbox and presses the enter key, the Accept button click event will execute.  This "Accept" button is an <asp:Button> control.

All was well until I moved to AJAX 1.0 from RC.  When I click the "Accept" button with the mouse it works fine.  If I press the enter key, I get the javascript error.

Anyone have any suggestions? 

Billy

I've just get this error. But it's work with a image button when i set a Offset X of 10 but when i try with 15 or 20 the postback error appear.

A simple solution to this is to put a simple <img> html tag with a runat=server attribute and it's work perfectly.

I've  got this same error but it still work with a image button when i set a Offset X of 10 but it crash when i try with a value of 15 and 20.

A simple solution to this is to use a simple <img> tag with a runat=server attribute. 

 I got this error,too.

Why can't we use a <asp:Button> or a<asp:ImageButton> instead of the <asp:LinkButton> control in aPopupControlExtender for a asyncPostBack?

I use a modal dialogs for my application.  All modal web forms use a special master page for the modal dialogs.  This master page has a script manager in it.

Whenever a modal dialog has only one textbox on it, I get this error when pressing the enter key while the cursor is in focus of the text box.  It does not matter if the modal web form uses an update panel or not.  Adding a link button doesn't help.  Adding an additional text box solves the issue!  So in my master page for the modal dialogs, i added an additional <asp:TextBox> control and set the Style="position: absolute; visibility: hidden;" and no longer have the error message.

I hope this workaround helps someone else who has struggled with this issue, as well as helps someone who is more familiar with the AJAX Framework to find a way to fix this issue.

 Billy

David,

The UseSubmitBehavior="false" setting did not solve my issue where there is one textbox (as well as other controls such as drop down lists and radio buttons) on a modal dialog, and the user presses the enter key while in the text box to cause a "Accept" button click.

Billy

I've just experienced a similar problem although not involving PopupControls. This case it was just a text box with a LINK button. The text box had default focus, and the link button was the default button for the form. When I pressed return in the text box it gave the "...is null..." error message.

My solution (incase anyone else experiences this) was to trap the onkeydown event and check if there was a carriage return key pressed. If there wasn't then return true, otherwise perform a manual postback (__doPostBack). Bit of a faff but its fixed my problems.