Ajax Accordion control example

The Accordion is a web control that allows you to provide multiple panes and display them one at a time. It is like having severalCollapsiblePanels where only one can be expanded at a time.TheAccordion is implemented as a web control that contains AccordionPane web controls. Each AccordionPane control has a template for its Header and its Content. We keep track of the selected paneso it stays visible across postbacks.

It also supports three AutoSize modes so it can fit in a variety of layouts.

None - The Accordion grows/shrinks without restriction. This can cause other elements on your page to move up and down with it.

Limit - The Accordion never grows larger than the value specified by its Height property. This will cause the content to scroll if it is too large to be displayed.

Fill - The Accordion always stays the exact same size as its Height property. This will cause the content to be expanded or shrunk if it isn't the right size.

The Accordion is written using an extender like most of the other extenders in the AJAX Control Toolkit. The extender expects its input  in a very specific hierarchy of container elements (like divs), so the Accordion and AccordionPane web controls are used to generate the expected input for the extender. The extender can also be used on its  own if you provide it appropriate input. The Accordion can also be databound. Simply specify a data source  through the DataSource or DataSourceID properties and then set  your data items in the HeaderTemplate and ContentTemplate properties.

Accordion Properties               

The control above is initialized with this code. The italic properties are

 <ajaxToolkit:Accordion     ID="MyAccordion"     runat="Server"

    SelectedIndex="0"     HeaderCssClass="accordionHeader"

    HeaderSelectedCssClass="accordionHeaderSelected"

    ContentCssClass="accordionContent"     AutoSize="None"

    FadeTransitions="true"     TransitionDuration="250"

    FramesPerSecond="40"     RequireOpenedPane="false"

    SuppressHeaderPostbacks="true">

    <Panes>

        <ajaxToolkit:AccordionPane

            HeaderCssClass="accordionHeader"

            HeaderSelectedCssClass="accordionHeader   Selected"

            ContentCssClass="accordionContent">

            <Header> . . . </Header>

            <Content> . . . </Content>

        </ajaxToolkit:AccordionPane>       

        .

        .

        .

    </Panes>           

    <HeaderTemplate>...</HeaderTemplate>

    <ContentTemplate>...</ContentTemplate>

</ajaxToolkit:Accordion>

SelectedIndex - The AccordionPane to be initially visible

HeaderCssClass - Name of the CSS class to use for the headers. This can be either applied to the Accordion as a default for all AccordionPanes, or an individual AccordionPane.

HeaderSelectedCssClass - Name of the CSS class to use for the selected header. This can be either applied to the Accordion as a default for all AccordionPanes, or an individual AccordionPane.

ContentCssClass - Name of the CSS class to use for the content. This can be either applied to the Accordion as a default for all AccordionPanes, or an individual AccordionPane.

FadeTransitions - True to use the fading transition effect, false for standard transitions.

TransitionDuration - Number of milliseconds to animate the transitions

FramesPerSecond - Number of frames per second used in the transition animations

AutoSize - Restrict the growth of the Accordion. The values of the AutoSize enumeration are described above.

RequireOpenedPane - Prevent closing the currently opened pane when its header is clicked (which ensures one pane is always open). The default value is true.

SuppressHeaderPostbacks - Prevent the client-side click handlers of elements inside a header from firing (this is especially useful when you want to include hyperlinks in your headers for accessibility)

Panes - Collection of AccordionPane controls

HeaderTemplate - The Header template contains the markup that should be used for an pane's header when databinding

ContentTemplate - The Content template contains the markup that should be used for a pane's content when databinding

DataSource - The data source to use. DataBind() must be called.

DataSourceID - The ID of the data source to use.

DataMember - The member to bind to when using a

The Accordion is a web control that allows you to provide multiple panesand display them one at a time. It is like having several CollapsiblePanels where only one can be expanded at a time. The Accordion is implemented as a web control that contains AccordionPane web controls. Each AccordionPane control has a template for its Header and its Content. We keep track of the selected pane so it stays visible across postbacks.

Accordion.aspx:

<asp:Accordion ID="Accordion1" runat="server" HeaderCssClass="accordianHead" AutoSize="None" SelectedIndex="0" FadeTransitions="true">
       <Panes>
       <asp:AccordionPane ID="About" runat="server">
       <Header><a>Aout</a></Header>
       <Content>       
<pre>  

  
First pane The Accordion is a web control that allows you to provide multiple panes and display them one at a time. It is like having several CollapsiblePanels where only one can be expanded at a time. The Accordion is implemented as a web control that contains AccordionPane web controls. Each AccordionPane control has a template for its Header and its Content. We keep track of the selected pane so it stays visible across postbacks.

       </pre>
       </Content>
       </asp:AccordionPane>
        <asp:AccordionPane ID="Code" runat="server">
       <Header><a>Code</a></Header>
       <Content>
       <pre>

Second pane The Accordion is a web control that allows you to provide multiple panes and display them one at a time. It is like having several CollapsiblePanels where only one can be expanded at a time. The Accordion is implemented as a web control that contains AccordionPane web controls. Each AccordionPane control has a template for its Header and its Content. We keep track of the selected pane so it stays visible across postbacks.

       </pre>
       </Content>
       </asp:AccordionPane>
       <asp:AccordionPane ID="Resources" runat="server" >
       <Header><a>Resources</a></Header>
       <Content>
       <pre>   <ul><li><a href="http://www.asp.net/ajax/videos/how-do-i-use-the-aspnet-ajax-accordion-control"> A Small Vedio</a></li>
               <li><a href="http://dotnetslackers.com/Community/blogs/kaushalparik/archive/2009/05/08/open-ajax-accordion-panes-on-mouseover.aspx">onHover Show Pane </a></li>
       </ul></pre></Content>
       </asp:AccordionPane>
       </Panes>
       </asp:Accordion>