ASP.NET Core PanelBar Overview
The PanelBar is part of Telerik UI for ASP.NET Core, a
professional grade UI library with 110+ components for building modern and feature-rich applications. To try it out sign up for a free 30-day trial.
The Telerik UI PanelBar TagHelper and HtmlHelper for ASP.NET Core are server-side wrappers for the Kendo UI PanelBar widget.
The PanelBar displays hierarchical data as a multi-level, expandable widget.
Basic Configuration
The following example demonstrates the basic configuration of the PanelBar.
@(Html.Kendo().PanelBar()
.Name("panelbar")
.ExpandMode(PanelBarExpandMode.Single)
.Items(panelbar =>
{
panelbar.Add().Text("Projects")
.Items(projects =>
{
projects.Add().Text("New Business Plan");
projects.Add().Text("Sales Forecasts")
.Items(forecasts =>
{
forecasts.Add().Text("Q1 Forecast");
forecasts.Add().Text("Q2 Forecast");
forecasts.Add().Text("Q3 Forecast");
forecasts.Add().Text("Q4 Forecast");
});
projects.Add().Text("Sales Reports");
});
panelbar.Add().Text("Programs")
.Items(programs =>
{
programs.Add().Text("Monday");
programs.Add().Text("Tuesday");
programs.Add().Text("Wednesday");
programs.Add().Text("Thursday");
programs.Add().Text("Friday");
});
panelbar.Add().Text("Communication").Enabled(false);
})
)
<kendo-panelbar name="employees" datatextfield="FullName">
<hierarchical-datasource>
<transport>
<read url="https://demos.telerik.com/kendo-ui/service/Employees" datatype="jsonp" />
</transport>
<schema type="json">
<hierarchical-model id="EmployeeId" has-children="HasEmployees">
</hierarchical-model>
</schema>
</hierarchical-datasource>
</kendo-panelbar>
<kendo-panelbar name="project">
<items>
<panelbar-item text="Storage" expanded="true">
<items>
<panelbar-item text="Wall Shelving"></panelbar-item>
<panelbar-item text="Floor Shelving"></panelbar-item>
<panelbar-item text="Kids Storag"></panelbar-item>
</items>
</panelbar-item>
<panelbar-item text="Lights">
<items>
<panelbar-item text="Ceiling"></panelbar-item>
<panelbar-item text="Table"></panelbar-item>
<panelbar-item text="Floor"></panelbar-item>
</items>
</panelbar-item>
</items>
</kendo-panelbar>
Functionality and Features
Events
You can subscribe to all PanelBar events. For a complete example on basic PanelBar events, refer to the demo on using the events of the PanelBar.
Handling by Handler Name
The following example demonstrates how to subscribe to events by a handler name.
@(Html.Kendo().PanelBar()
.Name("panelbar")
.Events(e => e
.Expand("panelbar_expand")
.Collapse("panelbar_collapse")
)
)
<script>
function panelbar_collapse() {
// Handle the collapse event.
}
function panelbar_expand() {
// Handle the expand event.
}
</script>
Handling by Template Delegate
The following example demonstrates how to subscribe to events by a template delegate.
@(Html.Kendo().PanelBar()
.Name("panelbar")
.Events(e => e
.Expand(@<text>
function() {
// Handle the expand event inline.
}
</text>)
.Collapse(@<text>
function() {
// Handle the collapse event inline.
}
</text>)
)
)
Referencing Existing Instances
To reference an existing PanelBar instance, use the jQuery.data() configuration option. Once a reference is established, use the client-side PanelBar API to control its behavior.
// Place this after the PanelBar for ASP.NET Core declaration.
<script>
$(document).ready(function() {
// The Name() of the panelbar is used to get its client-side instance.
var panelbar = $("#panelbar").data("kendoPanelBar");
});
</script>