Intersoft Community - WebTreeView - WebTreeView content lost after WebButton postback

WebTreeView content lost after WebButton postback

handy@intersoftpt.com — Fri, 22 Jan 2010 01:17:58 GMT

Ok, glad to hear that.

Regards,
Handy

WebTreeView content lost after WebButton postback

wayhang@elutions.com.my — Thu, 21 Jan 2010 21:07:35 GMT

It works now.

Thanks!

WebTreeView content lost after WebButton postback

handy@intersoftpt.com — Thu, 21 Jan 2010 02:08:42 GMT

Hi,

I noticed what caused your error now. It is because you used Master Page. While we are using HiddenField with attribute "runat=server", the clientID has been changed because inside MasterPage.

There are 2 workarounds to get the hidden object:

1.You can get new changed client id by using "view source" when running the page. You can search the changed id from there.

e,g if you search for "hfCheckedNode", the new client id should be "ctl00_ContentPlaceHolder1_hfCheckedNode".

2. Instead used the hard/static way, there is another workaround to use.

We need to add Hidden input html control without "runat=server" attribute. Then, cast the object in the value,
such as <input id="Hidden1" type="hidden" value="<%=hfCheckedNode.ClientID %>"/>

For further details, please look into my modified sample. I have also changed some codes to get checkednodes.

Hope this helps.

Regards,
Handy

WebTreeView content lost after WebButton postback

wayhang@elutions.com.my — Wed, 20 Jan 2010 02:08:58 GMT

hI,

i tried the code in WebTreeView sample project & it doesn't work either. Attached is the aspx file i make changes to GetCheckedNodes example.

Pls advise.

Thanks!

WebTreeView content lost after WebButton postback

handy@intersoftpt.com — Tue, 19 Jan 2010 23:24:33 GMT

Hi,

It seems the value or object is null. Please ensure that you are not putting the hiddenList control inside a template or something. The code i gave you is HiddenList control code. If you are using the other control, it might be not working. I could not just inspect what the error just by looking the screenshots. It is better if you can provide me your working sample so i can debug to see where the real problem is.

Regards,
Handy

WebTreeView content lost after WebButton postback

wayhang@elutions.com.my — Tue, 19 Jan 2010 04:02:10 GMT

Hi,

Attached is the error i hit when i make use of your code.

I hit the error when i check on any node of the WebTreeView.

Pls advise.

Thanks!

WebTreeView content lost after WebButton postback

handy@intersoftpt.com — Mon, 18 Jan 2010 22:37:52 GMT

Hi,

Here is my attached sample about how to save the checked nodes into HiddenField. But once again, i need to tell you that it is very hard to persist the checkboxes value in Unbound WebTreeView because all the nodes would be get rendered again every Postback. I suggest you to persist the checkbox value via client side.

Regards,
Handy

WebTreeView content lost after WebButton postback

wayhang@elutions.com.my — Mon, 18 Jan 2010 03:41:57 GMT

Hi Handy,

I can get the checked nodes on client side event. But when i tried to save the checked nodes into hidden input (asp.net label control), it seems like i'm not able to save it. Can you show me how to do it?

Thanks!

WebTreeView content lost after WebButton postback

theDiv — Fri, 08 Jan 2010 09:51:41 GMT

Hi Handy,

That works for me. I dont think I saw anything in the sample code or documentation on using Page_Init for data binding, but maybe I missed something.

Thanks for your help!

Darren

WebTreeView content lost after WebButton postback

handy@intersoftpt.com — Thu, 07 Jan 2010 22:44:47 GMT

Hello All,

It would be great if you guys could help me by sending me a simple sample which replicates your issue. Sometimes, the issue occured because the way you bound WebTreeView in incorrect event.

E.g for Darrent,

I think you should not bind in PageLoad. You will need to bind inside Page_Init.

Here is my attached sample and hope this can help you.

Regards,
Handy

WebTreeView content lost after WebButton postback

wayhang@elutions.com.my — Tue, 22 Dec 2009 20:46:30 GMT

I have a form with 2 WebCombo and 1 WebTab and 1 WebTreeView and 1 WebButton.

My WebCombo1 record is retrieved from sql.

When user selected any record in WebCombo1, I'll retrieve data from sql based on record selected in WebCombo1, and populate the records into WebCombo2.

When user selected any record in WebCombo2, i'll retrieve data from sql based on record selected in WebCombo2, and populate the records into WebTreeView (the WebTreeView reside in the WebTab).

So far, everything works fine. When user check node in WebTreeView, and click the WebButton (also reside in WebTab), in the WebButton_Clicked event (i use AutoPostBack=True and PostBackMode=FullPostBack), i try to get checked nodes by using WebTreeView.CheckedNodes. But no nodes is returned.

Another issue here is after user click the WebButton, and the page is PostBack, then the content in the WebTreeView is gone.

Any suggestion?