Expand Mode in Blazor Accordion Component

20 Aug 20215 minutes to read

The Accordion supports the two listed types of expand modes while expanding or collapsing the item.

  • Single
  • Multiple

Single

This property enables to expand only one Accordion item at a time. If any new item is expanded, the previously expanded one is collapsed, and the new item is changed to expanded state.

@using Syncfusion.Blazor.Navigations

<SfAccordion ExpandMode="ExpandMode.Single">
    <AccordionItems>
        <AccordionItem Expanded="true" Header="ASP.NET" Content="Microsoft ASP.NET is a set of technologies in the Microsoft .NET Framework for building Web applications and XML Web services."></AccordionItem>
        <AccordionItem Header="ASP.NET MVC" Content="The Model-View-Controller (MVC) architectural pattern separates an application into three main components: the model, the view, and the controller."></AccordionItem>
        <AccordionItem Header="JavaScript" Content="JavaScript (JS) is an interpreted computer programming language.It was originally implemented as part of web browsers so that client-side scripts could interact with the user, control the browser, communicate asynchronously, and alter the document content that was displayed."></AccordionItem>
    </AccordionItems>
</SfAccordion>

Output:

Blazor Accordion Component with Single Expand Mode

Multiple

The default ExpandMode of the Accordion is Multiple. It enables to expand more than one Accordion item at a time. The expand or collapse action can also be toggled by clicking on it again. For example, expanded item is collapsed when it is clicked again.

@using Syncfusion.Blazor.Navigations

<SfAccordion ExpandMode="ExpandMode.Multiple" @bind-ExpandedIndices=ExpandItems>
    <AccordionItems>
        <AccordionItem Header="ASP.NET" Content="Microsoft ASP.NET is a set of technologies in the Microsoft .NET Framework for building Web applications and XML Web services."></AccordionItem>
        <AccordionItem Header="ASP.NET MVC" Content="The Model-View-Controller (MVC) architectural pattern separates an application into three main components: the model, the view, and the controller."></AccordionItem>
        <AccordionItem Header="JavaScript" Content="JavaScript (JS) is an interpreted computer programming language.It was originally implemented as part of web browsers so that client-side scripts could interact with the user, control the browser, communicate asynchronously, and alter the document content that was displayed."></AccordionItem>
    </AccordionItems>
</SfAccordion>

@code {
    public int[] ExpandItems = new int[] { 0, 2 };
}

Output:

Blazor Accordion Component with Multiple Expand Mode

Expanding the items

By default, accordion items were in collapsed state on initial load. To expand a particular item(s) on initial load, either use the ExpandedIndices property or Expanded option within the AccordionItem tag helper. In the following code example, the ExpandedIndices is used to expand the second and third item.

@using Syncfusion.Blazor.Navigations

<SfAccordion @bind-ExpandedIndices=ExpandItems>
    <AccordionItems>
        @foreach (AccordionData Item in AccordionItems)
        {
            <AccordionItem>
                <HeaderTemplate>
                    <div>@(Item.EmployeeName)</div>
                </HeaderTemplate>
                <ContentTemplate>
                    <div>
                        <div><b>Employee ID: </b>@Item.EmployeeId</div>
                        <div><b>Designation: </b>@Item.Designation</div>
                    </div>
                </ContentTemplate>
            </AccordionItem>
        }
    </AccordionItems>
</SfAccordion>

@code{
    public int[] ExpandItems = new int[] { 1, 2 };
    List<AccordionData> AccordionItems = new List<AccordionData>()
    {
        new AccordionData
        {
        EmployeeId = 1,
        EmployeeName = "Laura Callahan",
        Designation = "Product Manager",
        },
        new AccordionData
        {
        EmployeeId = 3,
        EmployeeName = "Andrew Fuller",
        Designation = "Team Lead",
        },
        new AccordionData
        {
        EmployeeId = 4,
        EmployeeName = "Anne Dodsworth",
        Designation = "Developer"
        },
        new AccordionData
        {
        EmployeeId = 5,
        EmployeeName = "Nancy Davolio",
        Designation = "Product Manager"
        }
    };

    public class AccordionData
    {
        public string EmployeeName { get; set; }
        public int EmployeeId { get; set; }
        public string Designation { get; set; }
    }
}

Output:

Blazor Accordion Component with Expanding Items