Gantt Tree Data Binding Basics

This article explains the different ways to provide data to a Gantt Chart component and the properties related to data binding. Reviewing this article will explain the basics of how you can describe the hierarchy of items in your data source to the Gantt component so they can render.

For details on Value Binding and Data Binding, and the differences between them, see the Value Binding vs Data Binding article.

First, review:

• The available (bindable) features of a Gantt Tree item.
• How to match fields in the model with the Gantt Tree item data bindings.

There are two modes of providing data to a Gantt Tree, and they all use the items' features. Once you are familiar with the current article, choose the data binding you wish to use more:

• Flat data - a single collection of items with defined parent-child relationships. See the Id and ParentId settings.

• Hierarchical data - separate collections of items and their child items. This is the default mode of the component. See the Items setting.

Gantt Tree Item Features

The Blazor Gantt Tree provides various parameters to configure its items. Also, check the Gantt public API.

Parameter	Description
EndField	Defines the end date of a task.
HasChildren	Whether the item has children. Determines whether an expand arrow is rendered next to the item in an Expandable column. Required when loading data on-demand—if you don't set it to true, an expand arrow will not appear and the user will not be able to expand the item and load its children. With hierarchical data, the Gantt Tree will render the icon based on the existence of child items, but HasChildren will take precedence. You do not have to set or use its field unless you want to load data on demand or override the arrow for some items.
Id	A unique identifier for the item. Required only for binding to flat data.
Items	The collection of child items that will be rendered under the current item. Required only when binding to hierarchical data.
ParentId	Identifies the parent to whom the item belongs. Required only when binding to flat data. All items with the same ParentId will be rendered at the same level. For a root level item, ParentId needs to be null. There needs to be at least one node with a null value for the ParentId.
PercentCompleteField	Defines the level of completion of a task in percentages.
StartField	Defines the start date of a task.
TitleField	Defines what's the title of a task in percentages.

Data Bindings

The properties of a Gantt Tree item match directly to a field of the model the treelist is bound to. Provide that relationship by providing the name of the field from which the corresponding information is to be taken. To do this, in the main TelerikGantt tag, use the parameters described below:

• EndField => End
• HasChildrenField => HasChildren
• IdField => Id
• ItemsField => Items
• ParentIdField => ParentId
• PercentCompleteField => PercentComplete
• StartField => Start
• TitleField => Title

Notes

• The Gantt is designed to work with a collection of strongly typed models (e.g., IEnumerable<SomeDataModel>). If you provide an IEnumerable<object> instead, you must set the FieldType of the <GanttColumn> instances to the data type of the fields they use (e.g., <GanttColumn Field=@nameof(Employee.Name) FieldType="@(typeof(string))" />).

See Also

• Binding to Flat Data
• Binding to Hierarchical Data