TreeListComponent

Represents the Kendo UI TreeList component for Angular.

Selector

kendo-treelist

Export Name

Accessible in templates as #kendoTreeListInstance="kendoTreeList"

Inputs

aria-label

An optional accessible description of the component.

autoSize

Indicates whether the TreeList columns will be resized during initialization so that they fit their headers and row content. Defaults to false. Columns with autoSize set to false are excluded. To dynamically update the column width to match the new content, refer to this example.

columnMenu

(default: false) Specifies if the column menu of the columns will be displayed (see example).

filter

The descriptor by which the data will be filtered (see examples).

filterable

Enables the filtering of the TreeList columns that have their field option set.

height

Defines the height (in pixels) that is used when the scrollable option of the TreeList is set. To set the height of the TreeList, you can also use style.height. The style.height option supports units such as px, %, em, rem, and others.

hideHeader

Specifies if the header of the treelist will be hidden. The header is visible by default.

The header includes column headers and the filter row.

loading

(default: false) Specifies if the loading indicator of the TreeList will be displayed (see example).

navigable

If set to true, the user can use dedicated shortcuts to interact with the TreeList. By default, navigation is disabled and the TreeList content is accessible in the normal tab sequence.

pageSize

(default: 10) Defines the page size used by the TreeList when paging is enabled.

pageable

Configures the pager of the TreeList (see example).

The available options are:

• buttonCount: Number—Sets the maximum numeric buttons count before the buttons are collapsed. Defaults to 10.
• info: Boolean—Toggles the information about the current page and the total number of records. Defaults to true.
• type: PagerType—Accepts the numeric (buttons with numbers) and input (input for typing the page number) values. Defaults to 'numeric'.
• pageSizes: Boolean or Array<number>—Shows a menu for selecting the page size. Defaults to false.
• previousNext: Boolean—Toggles the Previous and Next buttons. Defaults to true.
• responsive: Boolean—Toggles the built-in responsive behavior of the Pager. Defaults to true.

reorderable

(default: false) If set to true, the user can reorder columns by dragging their header cells (see example).

resizable

(default: false) If set to true, the user can resize columns by dragging the edges (resize handles) of their header cells (see example).

rowHeight

Defines the row height that is used when the scrollable option of the TreeList is set to virtual. Required by the virtual scrolling functionality.

scrollable

Defines the scroll mode used by the TreeList.

The available options are:

• none—Renders no scrollbar.
• scrollable—The default scroll mode. It requires the setting of the height option.

sortable

Enables the sorting of the TreeList columns that have their field option set.

trackBy

A function that defines how to track changes for the data rows.

By default, the TreeList tracks changes by the index of the data item. Edited rows are tracked by reference. In some cases, you might need to override the default behavior, for example, when you implement editing with immutable data items.

The following example demonstrates how to track items only by index.

Copy Codeimport { Component } from '@angular/core';
import { TreeListItem } from '@progress/kendo-angular-treelist';

@Component({
   selector: 'my-app',
   template: `
       <kendo-treelist [data]="treelistData" [trackBy]="trackBy">
       </kendo-treelist>
   `
})
class AppComponent {
   public treelistData: any[] = products;

   public trackBy(index: number, item: TreeListItem): any {
       console.log(item);
       return index;
   }
}

const products = [{
   "ProductID": 1,
   "ProductName": "Chai",
   "UnitPrice": 18.0000,
   "Discontinued": true
 }, {
   "ProductID": 2,
   "ProductName": "Chang",
   "UnitPrice": 19.0000,
   "Discontinued": false
 }
];

virtualColumns

If set to true, the treelist will render only the columns in the current viewport.

data

Sets the data of the TreeList. If an array is provided, the TreeList automatically gets the total count (more information and example).

fetchChildren

Gets or sets the callback function that retrieves the child nodes for a particular node.

hasChildren

Gets or sets the callback function that indicates if a particular node has child nodes.

idField

(default: "id") The name of the field which contains the unique identifier of the node.

isExpanded

Sets the callback function that indicates if a particular item is expanded.

isSelected

Provides a callback that determines if the given row / cell is selected.

rowClass

Defines a function that is executed for every data row in the component.

Copy Codeimport { Component, ViewEncapsulation } from '@angular/core';
import { RowClassArgs } from '@progress/kendo-angular-treelist';

@Component({
   selector: 'my-app',
   encapsulation: ViewEncapsulation.None,
   styles: [`
       .k-treelist tr.even { background-color: #f45c42; }
       .k-treelist tr.odd { background-color: #41f4df; }
   `],
   template: `
       <kendo-treelist [data]="treelistData" [rowClass]="rowCallback">
       </kendo-treelist>
   `
})
class AppComponent {
   public treelistData: any[] = products;

   public rowCallback(context: RowClassArgs) {
       const isEven = context.index % 2 === 0;
       return {
           even: isEven,
           odd: !isEven
       };
   }
}

const products = [{
   "ProductID": 1,
   "ProductName": "Chai",
   "UnitPrice": 18.0000,
   "Discontinued": true
 }, {
   "ProductID": 2,
   "ProductName": "Chang",
   "UnitPrice": 19.0000,
   "Discontinued": false
 }
];

selectable

Specified the treelist selection settings

skip

Defines the number of records to be skipped by the pager. Required by the paging functionality.

sort

The descriptors by which the data will be sorted (see example).

Fields

columns

A query list of all declared columns.

activeCell

Returns the currently focused cell (if any).

activeRow

Returns the currently focused row (if any).

Events

add

Fires when the user clicks the Add command button to add a new row (see example).

cancel

Fires when the user clicks the Cancel command button to close a row (see example).

cellClick

Fires when the user clicks a cell (see example).

cellClose

Fires when the user leaves an edited cell (see example).

collapse

Fires when an item is collapsed.

columnLockedChange

Fires when the user changes the locked state of the columns from the column menu or by reordering the columns.

columnReorder

Fires when the user completes the reordering of the column.

columnResize

Fires when the user completes the resizing of the column.

columnVisibilityChange

Fires when the user changes the visibility of the columns from the column menu or column chooser.

contentScroll

Fires when the treelist content is scrolled. For performance reasons, the event is triggered outside the Angular zone. Enter the Angular zone if you make any changes that require change detection.

dataStateChange

Fires when the data state of the TreeList is changed.

edit

Fires when the user clicks the Edit command button to edit a row (see example).

excelExport

Fires when the user clicks the Export to Excel command button.

expand

Fires when an item is expanded.

filterChange

Fires when the TreeList filter is modified through the UI. You have to handle the event yourself and filter the data.

pageChange

Fires when the page of the TreeList is changed (see example). You have to handle the event yourself and page the data.

pdfExport

Fires when the user clicks the Export to PDF command button.

remove

Fires when the user clicks the Remove command button to remove a row (see example).

save

Fires when the user clicks the Save command button to save changes in a row (see example).

scrollBottom

Fires when the user scrolls to the last record on the page and enables endless scrolling (see example). You have to handle the event yourself and page the data.

selectionChange

Fires when the TreeList selection is changed.

sortChange

Fires when the sorting of the TreeList is changed (see example). You have to handle the event yourself and sort the data.

Methods

addRow

Creates a new row editor (see example).

Parameters

group

The FormGroup that describes the edit form. If called with a data item, it will build the FormGroup from the data item fields.

parent?

autoFitColumn

Applies the minimum possible width for the specified column, so that the whole text fits without wrapping. This method expects the TreeList to be resizable (set resizable to true). Makes sense to execute this method only after the TreeList is already populated with data.

Copy Code@Component({
   selector: 'my-app',
   template: `
       <kendo-treelist
           #treelist
           [data]="treelistData"
           [resizable]="true"
           style="height: 300px">
           <ng-template kendoTreeListToolbarTemplate>
                <button kendoButton (click)="treelist.autoFitColumn(groupColumn)">
                    Auto-fit the group column
                </button>
           </ng-template>
           <kendo-treelist-column-group #groupColumn title="Product Info">
               <kendo-treelist-column
                   field="ProductID"
                   [width]="50"
                   [minResizableWidth]="30"
                   title="ID">
               </kendo-treelist-column>

               <kendo-treelist-column
                   field="ProductName"
                   title="Product Name">
               </kendo-treelist-column>
           </kendo-treelist-column-group>

           <kendo-treelist-column
               field="UnitPrice"
               title="Unit Price"
               [width]="180"
               filter="numeric"
               format="{0:c}">
           </kendo-treelist-column>
       </kendo-treelist>
   `
})
class AppComponent {
   public treelistData: any[] = products;
}

const products = [{
   "ProductID": 1,
   "ProductName": "Chai",
   "UnitPrice": 18.0000,
   "Discontinued": true
 }, {
   "ProductID": 2,
   "ProductName": "Chang",
   "UnitPrice": 19.0000,
   "Discontinued": false
 }
];

Parameters

column

autoFitColumns

Adjusts the width of the specified columns to fit the entire content, including headers, without wrapping. If no columns are specified, autoFitColumns is applied to all columns.

This method requires the TreeList to be resizable (set resizable to true).

Copy Code@Component({
   selector: 'my-app',
   template: `
     <kendo-treelist
         #treelist
         [data]="treelistData"
         [resizable]="true"
         style="height: 300px">
         <ng-template kendoTreeListToolbarTemplate>
             <button kendoButton (click)="treelist.autoFitColumns([firstColumn, lastColumn])">
                 Auto-fit the first and last column
             </button>
             <button kendoButton (click)="treelist.autoFitColumns()">
                 Auto-fit all columns
             </button>
         </ng-template>
         <kendo-treelist-column-group title="Product Info">
             <kendo-treelist-column
                 #firstColumn
                 field="ProductID"
                 [width]="50"
                 [minResizableWidth]="30"
                 title="ID">
             </kendo-treelist-column>

             <kendo-treelist-column
                 field="ProductName"
                 title="Product Name"
                 >
             </kendo-treelist-column>
         </kendo-treelist-column-group>

         <kendo-treelist-column
             #lastColumn
             field="UnitPrice"
             title="Unit Price"
             [width]="180"
             filter="numeric"
             format="{0:c}">
         </kendo-treelist-column>
     </kendo-treelist>
   `
})
class AppComponent {
   public treelistData: any[] = products;
}

const products = [{
   "ProductID": 1,
   "ProductName": "Chai",
   "UnitPrice": 18.0000,
   "Discontinued": true
 }, {
   "ProductID": 2,
   "ProductName": "Chang",
   "UnitPrice": 19.0000,
   "Discontinued": false
 }
];

Parameters

columns

cancelCell

Closes the current cell in edit mode.

closeCell

Closes the current cell in edit mode and fires the cellClose event.

Returns

Indicates whether the edited cell was closed. A false value indicates that the cellClose event was prevented.

closeRow

Closes the editor for a given row (see example).

Parameters

item

isNew

collapse

Collapses the row for the specified dataItem.

Parameters

dataItem

drawPDF

Exports the TreeList element to a Drawing Group by using the kendo-treelist-pdf component options. (see example).

Returns

• A promise that will be resolved with the Drawing Group.

editCell

Puts the cell that is specified by the table row and column in edit mode.

Parameters

dataItem

column

The leaf column index, or the field name or the column instance that should be edited.

group?

The FormGroup that describes the edit form.

editRow

Switches the specified table row in the edit mode (see example).

Parameters

item

group?

The FormGroup that describes the edit form.

options?

Additional options. Use skipFocus to determine if the row's edit element should be focused. Defaults to false.

expand

Expands the row for the specified dataItem.

Parameters

dataItem

focus

Focuses the last active or the first cell of the TreeList.

Returns

The focused cell.

focusCell

Focuses the cell with the specified row and column index.

The row index is based on the logical structure of the TreeList and does not correspond to the data item index:

• Header rows are included, starting at index 0.
• The row indexing is absolute and does not change with paging.

If the TreeList is configured for scrolling, including virtual scrolling, the scroll position will be updated. If the row is not present on the current page, the method will have no effect.

Parameters

rowIndex

The logical row index to focus. The top header row has an index 0.

colIndex

The column index to focus.

Returns

The focused cell.

focusNextCell

Focuses the next cell, optionally wrapping to the next row.

Parameters

wrap

A Boolean value which indicates if the focus will move to the next row. Defaults to true.

Returns

The focused cell. If the focus is already on the last cell, returns null.

focusPrevCell

Focuses the previous cell. Optionally wraps to the previous row.

Parameters

wrap

A Boolean value which indicates if the focus will move to the next row. Defaults to true.

Returns

The focused cell. If the focus is already on the first cell, returns null.

isEditing

Returns a flag which indicates if a row or a cell is currently edited.

Returns

A flag which indicates if a row or a cell is currently edited.

isEditingCell

Returns a flag which indicates if a cell is currently edited.

Returns

A flag which indicates if a cell is currently being edited.

reload

Clears the already loaded children for the dataItem so that the TreeList will fetch them again the next time it is rendered.

Parameters

dataItem

reloadChildren?

reorderColumn

Changes the position of the specified column. The reordering of columns operates only on the level which is inferred by the source column. For the reorderColumn method to work properly, the source column has to be visible.

Copy Code@Component({
   selector: 'my-app',
   template: `
       <kendo-treelist
           #treelist
           [data]="treelistData"
           [reorderable]="true"
           style="height: 300px">
           <ng-template kendoTreeListToolbarTemplate>
                <button kendoButton
                    (click)="treelist.reorderColumn(groupColumn, 2, { before: true })">
                    Move the group column before the last one.
                </button>
           </ng-template>
           <kendo-treelist-column-group #groupColumn title="Product Info">
               <kendo-treelist-column
                   field="ProductID"
                   [width]="50"
                   title="ID">
               </kendo-treelist-column>

               <kendo-treelist-column
                   field="ProductName"
                   title="Product Name">
               </kendo-treelist-column>
           </kendo-treelist-column-group>

           <kendo-treelist-column
               field="UnitPrice"
               title="Unit Price"
               [width]="180"
               format="{0:c}">
           </kendo-treelist-column>

           <kendo-treelist-column
               field="Discontinued"
               title="Discontinued"
               [width]="100">
           </kendo-treelist-column>
       </kendo-treelist>
   `
})
class AppComponent {
   public treelistData: any[] = products;
}

const products = [{
   "ProductID": 1,
   "ProductName": "Chai",
   "UnitPrice": 18.0000,
   "Discontinued": true
 }, {
   "ProductID": 2,
   "ProductName": "Chang",
   "UnitPrice": 19.0000,
   "Discontinued": false
 }
];

Parameters

source

The column whose position will be changed.

destIndex

The new position of the column.

options

Additional options.

saveAsExcel

Initiates the Excel export (see example).

saveAsPDF

Initiates the PDF export (see example).

scrollTo

Scrolls to the specified row and column

Parameters

request

updateView

Updates the state of the current view without reloading the data.

Checks all currently rendered items for changes and triggers re-evaluation of the the isExpanded and isSelected callbacks.