Where is the documentation?

2 posts, 0 answers
  1. Andrew Ryan
    Andrew Ryan avatar
    15 posts
    Member since:
    Apr 2009

    Posted 06 Aug 2009 Link to this post

    I have several questions, and can't seem to find any documentation:

    1) You say the XmlHttpPanel isn't universal - so when can't it be used, vs. Telerik Ajax?
    2) Are there other examples beyond the Demos of how to use it?

    For instance - I have an application with shows a record, and then undernead it a set of tab. Each tab hasa RadGrid with related items. In this case, the record is an Individual, and the tabs are Invoices, Payments, Registrations, Refunds. I'd like when the tab gets clicked, to have the panel dynamically populate the RadGrid using a WebService call.

    is this possible using XmlHttpPanel?
  2. Tervel
    Admin
    Tervel avatar
    1337 posts

    Posted 11 Aug 2009 Link to this post

    Hi Andrew,

    We are working on extending the RadXmlHttpPanel's documentation - and one area where we will certainly provide more information is comparison against RadAjaxPanel - when it is better to use one, and when it is good to use the other.

    That said, the default Rad
    XmlHttpPanel demo's description does provide some insight on the matter. For your convenience I paste it here:

    ==============================================================================
    Telerik RadXmlHttpPanel is a panel that can load content on demand. Unlike UpdatePanel, or RadAjaxPanel, it is not universal, and cannot be used in all scenarios. However, in scenarios where it is possible to use it, it will deliver much better performance compared to its AJAX counterparts.

    Partial page updates with AJAX are flexible and can be used in just about any scenario. However, when AJAX is used, the server-side page goes through its full page lifecycle. The whole control tree is created, all event handlers are executed, the ViewState is processed and updated, and sent back to the client. On the other hand, callbacks and web services can also be used for partial page updates, but carry a much smaller (or even no additional) overhead.

    There are two ways for loading data on the RadXmlHttpPanel - by using the ASP.NET Callback mechanims and WebService.

    • Callback - When a client callback is used, the server Page does not go through its whole lifecycle, but only a small part of it. The client state is not updated, and it is not sent back to the client-side. When Callbacks are used, a POST request is made from the client to the server, and the values of all FORM fields, such as hidden fields (including the view state field) are sent to the server. When the view state is large, this could mean increased overhead. On the other hand, no extra files are needed to use this mode (unlike when using a WebService).
    • WebService - can be used to handle the data request of the RadXmlHttpPanel. The WebMethodPath and the WebMethodName properties should be set and the RadXmlHttpPanel automatically retrieves and loads the data. Similarly as in the Client Callback the client state is not affected. A web service requires a couple of extra files to set up, but it is the most efficient approach, as no data, other than the Value string is sent over from the client to the server.

    2) There are no examples yet other than the demos, but we will be adding more soon - along with extending the documentation.


    The decision whether to use pure AJAX or the RadXmlHttpPanel is in fact very simple - if you are not sure whether you can use the RadXmlHttpPanel, then you must use AJAX.

    In this particular case with RadGrid, you should use AJAX. However, there is another approch that you might consider examining - and this is using the built-in RadGrid client-side binding (which uses neither RadAjaxPanel or RadXmlHttpPanel). Here is a demo on RadGrid's client-side binding which provides extra information:
    http://demos.telerik.com/aspnet-ajax/grid/examples/client/declarativedatabinding/defaultcs.aspx

    Best regards,
    Tervel
    the Telerik team

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