I'm relatively new to Telerik, ASP.NET and VB so please bear with me.
I'm trying to build an admin page which will allow the user to change various properties drawn from a database. I've got it working fine as far as getting/setting values to textboxes and now I'm trying to substitute in more specific UI elements such as color pickers and numeric text boxes.
As it stands the admin page uses a control, each control containing some table markup and a Placeholder element. My thought was that I could attach correct UI widget based on the type of the control, but I can't get this to work.
In Page_Prerender of the control, the widgets are created and attached to the placeholder. My problem comes in getting the changed values from these widgets when the user selects save. It doesn't need to be as each setting is changed.
How should I go about getting these values back out? I tried retrieving the value by getting the widget from the Placeholder's controls collection, but it only seems to include elements place in the placeholder in the markup, not those added in the code-behind.
Thank you for any help you can provide.
I'm trying to build an admin page which will allow the user to change various properties drawn from a database. I've got it working fine as far as getting/setting values to textboxes and now I'm trying to substitute in more specific UI elements such as color pickers and numeric text boxes.
As it stands the admin page uses a control, each control containing some table markup and a Placeholder element. My thought was that I could attach correct UI widget based on the type of the control, but I can't get this to work.
In Page_Prerender of the control, the widgets are created and attached to the placeholder. My problem comes in getting the changed values from these widgets when the user selects save. It doesn't need to be as each setting is changed.
How should I go about getting these values back out? I tried retrieving the value by getting the widget from the Placeholder's controls collection, but it only seems to include elements place in the placeholder in the markup, not those added in the code-behind.
Thank you for any help you can provide.
2 Answers, 1 is accepted
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Accepted
Hello Ryan,
Creating ASP.NET AJAX server controls like ours (or UI widgets, as you call them) dynamically after PageLoad is improper way to instantiate them. You can test that with a regular ASP.NET button created programmatically in the PreRender phase of the lifecycle - on subsequent postbacks the control will be lost and its viewstate/events will be corrupted.
Therefore, consider instantiating the UI controls at runtime on PageInit/PageLoad or the CreateChildControls method (in case you wrap them in other ASP.NET control). See this article for further reference.
Best regards,
Sebastian
the Telerik team
Creating ASP.NET AJAX server controls like ours (or UI widgets, as you call them) dynamically after PageLoad is improper way to instantiate them. You can test that with a regular ASP.NET button created programmatically in the PreRender phase of the lifecycle - on subsequent postbacks the control will be lost and its viewstate/events will be corrupted.
Therefore, consider instantiating the UI controls at runtime on PageInit/PageLoad or the CreateChildControls method (in case you wrap them in other ASP.NET control). See this article for further reference.
Best regards,
Sebastian
the Telerik team
Browse the vast support resources we have to jump start your development with RadControls for ASP.NET AJAX. See how to integrate our AJAX controls seamlessly in SharePoint 2007/2010 visiting our common SharePoint portal.
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Ryan
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answered on 05 Aug 2011, 02:36 PM
Thank you for your prompt reply.
I moved my code to PageInit instead and everything works now. Thanks.
I moved my code to PageInit instead and everything works now. Thanks.