JavaScript/jQuery TreeList Methods
addColumn(columnOptions)
The column's configuration or a data field for which the column should be created.
addRow()
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- Call Methods: jQuery | Angular | AngularJS | Knockout | ASP.NET MVC
- TreeList - Add a Row
- editing.allowUpdating
addRow(parentId)
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- Call Methods: jQuery | Angular | AngularJS | Knockout | ASP.NET MVC
- TreeList - Add a Row
- editing.allowUpdating
beginCustomLoading(messageText)
Shows the load panel.
Normally, the load panel is invoked automatically while the widget is busy rendering or loading data. Additionally, you can invoke it by calling this method. If you call it without the argument, the load panel displays text specified by the loadPanel.text option. To specify the appearance of the load panel, use the loadPanel object. Once invoked from code, the load panel will not hide until you call the endCustomLoading() method.
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beginUpdate()
Prevents the widget from refreshing until the endUpdate() method is called.
The beginUpdate() and endUpdate() methods prevent the widget from excessive updates when you are changing multiple widget settings at once. After the beginUpdate() method is called, the widget does not update its UI until the endUpdate() method is called.
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byKey(key)
A Promise that is resolved after the data object is loaded. It is a native Promise or a jQuery.Promise when you use jQuery.
The following code shows how to get a data object whose key is 15.
widgetInstance.byKey(15).done(function(dataObject) { // process "dataObject" }).fail(function(error) { // handle error });
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- instance()
cellValue(rowIndex, visibleColumnIndex, value)
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clearFilter(filterName)
The method's parameter specifies what type of filter should be cleared. The parameter can have one of the following values:
- 'dataSource' - clears the dataSource filter (defined in the configuration or applied by the filter(filterExpr) method);
- 'search' - clears the search panel;
- 'header' - clears the column header filter;
- 'row' - clears the filter row.
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clearSelection()
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- deselectAll()
- deselectRows(keys)
closeEditCell()
Switches the cell being edited back to the normal state. Takes effect only if editing.mode is batch and showEditorAlways is false.
collapseRow(key)
A Promise that is resolved after the row is collapsed. It is a native Promise or a jQuery.Promise when you use jQuery.
columnOption(id)
This method gets the options of the first column found by either of the below:
Name
The unique name of the column.Column Index
The index of the column in the columns array.Data Field
The name of the data source field assigned to the column.Caption
The text displayed in the column header.Service String
One of the following values:"command:edit"
Gets the editing column."command:adaptive"
Gets the adaptive column.Any string matching the following format: "optionName:value"
Here, the optionName is one of the column options.
See Also
columnOption(id, optionName)
This method gets the value of an option of the first column found by either of the below:
Name
The unique name of the column.Column Index
The index of the column in the columns array.Data Field
The name of the data source field assigned to the column.Caption
The text displayed in the column header.Service String
One of the following values:"command:edit"
Gets the editing column."command:adaptive"
Gets the adaptive column.Any string matching the following format: "optionName:value"
Here, the optionName is one of the column options.
See Also
columnOption(id, optionName, optionValue)
This method sets an option of the first column found by either of the below:
Name
The unique name of the column.Column Index
The index of the column in the columns array.Data Field
The name of the data source field assigned to the column.Caption
The text displayed in the column header.Service String
One of the following values:"command:edit"
Gets the editing column."command:adaptive"
Gets the adaptive column.Any string matching the following format: "optionName:value"
Here, optionName is one of the column options.
NOTEIn command columns, you can change only the width and the visibleIndex. See the Command Columns topic for details.
See Also
columnOption(id, options)
This method changes options of the first column found by either of the below:
Name
The unique name of the column.Column Index
The index of the column in the columns array.Data Field
The name of the data source field assigned to the column.Caption
The text displayed in the column header.Service String
One of the following values:"command:edit"
Gets the editing column."command:adaptive"
Gets the adaptive column.Any string matching the following format: "optionName:value"
Here, optionName is one of the column options.
NOTEIn command columns, you can change only the width and the visibleIndex. See the Command Columns topic for details.
See Also
defaultOptions(rule)
defaultOptions is a static method that the widget class supports. The following code demonstrates how to specify default options for all instances of the TreeList widget in an application executed on the desktop.
jQuery
DevExpress.ui.dxTreeList.defaultOptions({ device: { deviceType: "desktop" }, options: { // Here go the TreeList options } });
Angular
import TreeList from 'devextreme/ui/tree_list'; // ... export class AppComponent { constructor () { TreeList.defaultOptions({ device: { deviceType: "desktop" }, options: { // Here go the TreeList options } }); } }
deleteColumn(id)
This method removes the first column found by either of the below:
Name
The unique name of the column.Column Index
The index of the column in the columns array.Data Field
The name of the data source field assigned to the column.Caption
The text displayed in the column header.
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- addColumn(columnOptions)
- deleteRow(rowIndex)
deleteRow(rowIndex)
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- addRow()
- deleteColumn(id)
deselectAll()
A Promise that is resolved after the selection is cleared. It is a native Promise or a jQuery.Promise when you use jQuery.
deselectRows(keys)
Array<any>
A Promise that is resolved after selection is cleared. It is a native Promise or a jQuery.Promise when you use jQuery.
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- Call Methods: jQuery | Angular | AngularJS | Knockout | ASP.NET MVC
- Initial and Runtime Selection
- deselectAll()
dispose()
The following code disposes of an TreeList instance that corresponds to the element ID (or reference variable in Angular) and removes the element from the DOM:
jQuery
$("#myTreeList").dxTreeList("dispose"); $("#myTreeList").remove();
Angular
<dx-tree-list #treeListVar id="myTreeList"></dx-tree-list>
import { ..., ViewChild } from "@angular/core"; import { DxTreeListComponent } from "devextreme-angular"; // ... export class AppComponent { @ViewChild("treeListVar") treeList: DxTreeListComponent; removeTreeList (e) { this.treeList.instance.dispose(); document.getElementById("myTreeList").remove(); } }
editCell(rowIndex, dataField)
Switches a cell with a specific row index and a data field to the editing state. Takes effect only if the editing mode is 'batch' or 'cell'.
editCell(rowIndex, visibleColumnIndex)
Switches a cell with specific row and column indexes to the editing state. Takes effect only if the editing mode is 'batch' or 'cell'.
editRow(rowIndex)
Switches a row with a specific index to the editing state. Takes effect only if the editing mode is 'row', 'popup' or 'form'.
endCustomLoading()
Hides the load panel.
Normally, the widget hides the load panel automatically once data is ready. But if you have invoked the load panel from code using the beginCustomLoading(messageText) method, you must call the endCustomLoading() method to hide it.
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endUpdate()
Refreshes the widget after a call of the beginUpdate() method.
Main article: beginUpdate()
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expandRow(key)
A Promise that is resolved after the row is expanded. It is a native Promise or a jQuery.Promise when you use jQuery.
filter()
Gets a filter expression applied to the widget's data source using the filter(filterExpr) method.
filter(filterExpr)
Pass an array with the following members to this method.
- The data source field by which data items are filtered.
- The comparison operator. The following operators are available: "=", "<>", ">", ">=", "<", "<=", "startswith", "endswith", "contains", "notcontains".
- The value with which data source field values should be compared.
This method applies a filter before the filter row, search panel, or header filter does. To clear all filters applied both from code and the UI, call the clearFilter() method.
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- getCombinedFilter()
focus(element)
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- getCellElement(rowIndex, visibleColumnIndex)
forEachNode(callback)
Performs a pre-order tree traversal, executing a function on each visited node. Starts traversing from the top level nodes.
forEachNode(nodes, callback)
Performs a pre-order tree traversal, executing a function on each visited node. Starts traversing from the specified nodes.
getCellElement(rowIndex, dataField)
The cell's container. An HTML element or a jQuery element when you use jQuery. If the specified row or data field does not exist, the method returns undefined.
getCellElement(rowIndex, visibleColumnIndex)
The cell's container. An HTML element or a jQuery element when you use jQuery. If the specified row or column does not exist, the method returns undefined.
getCombinedFilter()
Use this method to get the total filter, which combines filters applied using the filter(filterExpr) method, filter row, header filter and the search panel. Note that the total filter contains getters. To get the total filter with data fields, call the getCombinedFilter(returnDataField) method.
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getCombinedFilter(returnDataField)
Use this method to get the total filter, which combines filters applied using the filter(filterExpr) method, filter row, header filter and the search panel.
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- getCombinedFilter()
getInstance(element)
getInstance is a static method that the widget class supports. The following code demonstrates how to get the TreeList instance found in an element with the myTreeList
ID:
// Modular approach import TreeList from 'devextreme/ui/tree_list'; ... let element = document.getElementById("myTreeList"); let instance = TreeList.getInstance(element) as TreeList; // Non-modular approach let element = document.getElementById("myTreeList"); let instance = DevExpress.ui.dxTreeList.getInstance(element);
See Also
getRowElement(rowIndex)
Note that if the widget has fixed columns, the method returns an array of two separate elements: with unfixed and with fixed columns.
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getRowIndexByKey(key)
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- getKeyByRowIndex(rowIndex)
getScrollable()
For information on API members of the scrollable part, refer to the ScrollView section, but bear in mind that several members described there are unavailable. Those are the following.
Options:
- pullingDownText
- pulledDownText
- refreshingText
- reachBottomText
- onPullDown
- onReachBottom
Methods:
- release(preventScrollBottom)
- refresh()
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getSelectedRowKeys()
Array<any>
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- Initial and Runtime Selection
- getSelectedRowsData()
getSelectedRowsData()
Array<any>
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- cellValue(rowIndex, dataField)
- cellValue(rowIndex, visibleColumnIndex)
getVisibleColumns()
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- getVisibleColumns(headerLevel)
- columns
getVisibleColumns(headerLevel)
Gets all visible columns at a specific hierarchical level of column headers. Use it to access banded columns.
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- getVisibleColumns()
- columns
getVisibleRows()
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- Row Structure
- getVisibleColumns()
hasEditData()
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- saveEditData()
- cancelEditData()
isAdaptiveDetailRowExpanded(key)
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- expandAdaptiveDetailRow(key)
- collapseAdaptiveDetailRow()
- columnHidingEnabled
loadDescendants()
Loads all root node descendants (all data items). Takes effect only if data has the plain structure and remoteOperations | filtering is true.
A Promise that is resolved after data is loaded. It is a native Promise or a jQuery.Promise when you use jQuery.
loadDescendants(keys)
Loads a specific node's descendants. Takes effect only if data has the plain structure and remoteOperations | filtering is true.
Array<any>
A Promise that is resolved after data is loaded. It is a native Promise or a jQuery.Promise when you use jQuery.
loadDescendants(keys, childrenOnly)
Loads all or only direct descendants of specific nodes. Takes effect only if data has the plain structure and remoteOperations | filtering is true.
A Promise that is resolved after data is loaded. It is a native Promise or a jQuery.Promise when you use jQuery.
refresh()
A Promise that is resolved after data is loaded. It is a native Promise or a jQuery.Promise when you use jQuery.
The widget cannot track changes made in the data source by a third party. To bring data in the widget up to date in this case, call this method. Data sources of lookup columns will be updated along with the main data source.
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repaintRows(rowIndexes)
This method updates the row objects and their visual representation.
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saveEditData()
A Promise that is resolved after changes are saved in the data source. It is a native Promise or a jQuery.Promise when you use jQuery.
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- cancelEditData()
- hasEditData()
- onRowInserted
- onRowUpdated
- onRowRemoved
searchByText(text)
Seeks a search string in the columns whose allowSearch option is true.
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- Call Methods: jQuery | Angular | AngularJS | Knockout | ASP.NET MVC
- getCombinedFilter()
- searchPanel
selectAll()
A Promise that is resolved after all rows are selected. It is a native Promise or a jQuery.Promise when you use jQuery.
If a filter is applied, this method selects only those rows that meet the filtering conditions.
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- selectRows(keys, preserve)
- selection
selectRows(keys, preserve)
A Promise that is resolved after the rows are selected. It is a native Promise or a jQuery.Promise when you use jQuery.
By default, this method call clears selection of previously selected rows. To keep these rows selected, call this method with true as the second argument.
widgetInstance.selectRows([5, 10, 12], true);
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- Initial and Runtime Selection
- selectRowsByIndexes(indexes)
selectRowsByIndexes(indexes)
A Promise that is resolved after the rows are selected. It is a native Promise or a jQuery.Promise when you use jQuery.
This method has the following specifics:
- A call of this method clears selection of all previously selected rows.
- When calculating row indexes, the widget ignores the hierarchy of rows.
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undeleteRow(rowIndex)
Recovers a row deleted in batch editing mode.
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- closeEditCell()
- cancelEditData()
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