Accordion

in namespace DotVVM.Framework.Controls.Bootstrap4

Wraps a group of AccordionItem controls to create an accordion-like behavior.

Usage & Scenarios

Wraps a group of AccordionItem controls to create an accordion-like behavior. When you expand one of the items inside, the others will collapse. Only one item can be expanded at the same time.

https://getbootstrap.com/docs/4.3/components/collapse/#accordion-example

Sample 1: Basic Accordion

To use this control, just place several AccordionItem controls inside the Accordion control. The AccordionItem inherits from Card and can specify the IsExpanded property to indicate whether the item is expanded or not.

In the most common scenario, you need the first panel to be expanded while the others are collapsed.

page.dothtml

<bs:Accordion>
  
  <bs:AccordionItem HeaderText="Card 1"
                    TitleText="Card 1"
                    Text="This is first accordion item." 
                    IsExpanded="true" />

  <bs:AccordionItem HeaderText="Card 2"
                    TitleText="Card 3"
                    Text="This is second accordion item." />

  <bs:AccordionItem HeaderText="Card 3"
                    TitleText="Card 3"
                    Text="This is third accordion item." />
  
</bs:Accordion>

Sample 2: Data-binding the Accordion

The ExpandedItemIndex property specifies the index of the accordion item which is selected.

The DataSource property can be used to generate the items from an IEnumerable in the viewmodel.

Then you can use the following properties which tell the control what property of the collection item will be used:

TextBinding specifies the property of the collection elements to be used as the content of the accordion item.
HeaderTextBinding specifies the text in the accordion item header.
FooterTextBinding specifies the text in the accordion item footer.

page.dothtml
ViewModel.cs

<bs:Accordion ExpandedItemIndex="{value: Index}" 
              DataSource="{value: Panels}" 
              TextBinding="{value: Text}" 
              HeaderTextBinding="{value: Text}" />

<p>Expanded panel index: {{value: Index}}</p>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace DotvvmWeb.Views.Docs.Controls.bootstrap.Accordion.sample2
{
    public class ViewModel
    {
        public int Index { get; set; } = 1;

        public PanelData[] Panels { get; set; } =
        {
            new PanelData("Text 1"),
            new PanelData("Text 2"),
            new PanelData("Text 3")
        };
    }

    public class PanelData
    {
        public string Text { get; set; }

        public PanelData()
        {
        }

        public PanelData(string text)
        {
            Text = text;
        }
    }
}

Show all inherited properties

Properties

Name	Type	Description	Notes	Default Value
ClientIDMode	ClientIDMode	Gets or sets the client ID generation algorithm.	attribute inner element static value bindable default	Static
DataContext	Object	Gets or sets a data context for the control and its children. All value and command bindings are evaluated in context of this value. The DataContext is null in client-side templates.	attribute inner element static value bindable default	null
DataSource	Object	Gets or sets the source collection or a GridViewDataSet that contains data in the control.	attribute inner element static value bindable default	null
ExpandedItemIndex	Int32	Gets or sets the index of the item which is currently expanded.	attribute inner element static value bindable default	-1
FooterTextBinding	IValueBinding	Gets or sets the value binding that points to a property which will be used as the footer text of the item.	attribute inner element static value bindable default	null
HeaderTextBinding	IValueBinding	Gets or sets the value binding that points to a property which will be used as the header text of the item.	attribute inner element static value bindable default	null
ID	String	Gets or sets the control client ID within its naming container.	attribute inner element static value bindable default	null
IncludeInPage	Boolean	Gets or sets whether the control is included in the DOM of the page.	attribute inner element static value bindable default	True
InnerText	String	Gets or sets the inner text of the HTML element. Note that this property can only be used on HtmlGenericControl directly and when the control does not have any children.	attribute inner element static value bindable default	null
Items	List<IAccordionItem>	Gets or sets a collection of items that is used when no DataSource is set.	attribute inner element static value bindable default	null
ItemsContent	List<ICardItem>	Gets or sets the content for accordion items bound from DataSource.	attribute inner element static value bindable default	null
ItemsFooterTemplate	ITemplate	Gets or sets the footer template for accordion items bound from DataSource.	attribute inner element static value bindable default	null
ItemsHeaderTemplate	ITemplate	Gets or sets the content for accordion items bound from DataSource.	attribute inner element static value bindable default	null
SubtitleTextBinding	IValueBinding	Gets or sets the value binding that points to a property which will be used as the subtitle text of the item.	attribute inner element static value bindable default	null
TextBinding	IValueBinding	Gets or sets the value binding that points to a property which will be used as the text of the item.	attribute inner element static value bindable default	null
TitleTextBinding	IValueBinding	Gets or sets the value binding that points to a property which will be used as the title text of the item.	attribute inner element static value bindable default	null
Visible	Boolean	Gets or sets whether the control is visible. When set to false, `style="display: none"` will be added to this control.	attribute inner element static value bindable default	True

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Accordion

Usage & Scenarios

Sample 1: Basic Accordion

Sample 2: Data-binding the Accordion

Properties

HTML produced by the control

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