ComboBoxItem Class
A Combo Box dashboard item that allows end users to filter other dashboard items.
Declaration
export class ComboBoxItem extends FilterElementItemBaseRemarks
The Combo Box dashboard item allows end users to filter other dashboard items by selecting a value(s) from the drop-down list .
Refer to Filter Elements Overview to learn more about filter elements.
Example
The following example shows how to create the Combo Box dashboard item, bind it to data and add to the existing dashboard.
Create data items (dimensions) and use the DataItem.dataMember property to bind them to the existing data source’s columns. Then use the created dimensions in the dashboard item to bind it to data.
After you add the created dashboard item to the Dashboard.items collection, call the Dashboard.rebuildLayout method to rebuild the dashboard layout and display changes.
// Use the line below for a modular approach:
// import * as Model from 'devexpress-dashboard/model'
// Use the line below for an approach with global namespaces:
// var Model = DevExpress.Dashboard.Model;
// ...
public creatComboBox() {
// Create data items for the ComboBox.
var comboBoxCountry = new Model.Dimension();
comboBoxCountry.dataMember("Country");
var comboBoxFullName = new Model.Dimension();
comboBoxFullName.dataMember("FullName");
// Create the ComboBox dashboard item and bind it to data.
var comboBoxItem = new Model.ComboBoxItem();
comboBoxItem.name('comboBox');
comboBoxItem.dataSource(sqlDataSource.componentName());
comboBoxItem.dataMember(sqlDataSource.queries()[0].name());
comboBoxItem.filterDimensions.push(comboBoxCountry);
comboBoxItem.filterDimensions.push(comboBoxFullName);
comboBoxItem.comboBoxType("Checked");
control.dashboard().items.push(comboBoxItem);
// ...
control.dashboard().rebuildLayout();
}
Inherited Members
Inheritance
constructor
Initializes a new instance of the ComboBoxItem class.
Declaration
constructor(
dashboardItemJSON?: any,
serializer?: DevExpress.Analytics.Utils.ModelSerializer
)Parameters
| Name | Type | Description |
|---|---|---|
| dashboardItemJSON | any | A JSON object used for dashboard deserialization. Do not pass this parameter directly. |
| serializer | ModelSerializer | An object used for dashboard deserialization. Do not pass this parameter directly. |
Properties
comboBoxType Property
Specifies the type of the Combo Box dashboard item.
Declaration
comboBoxType: ko.Observable<DevExpress.Dashboard.Model.ComboBoxDashboardItemType>Property Value
| Type | Description |
|---|---|
| Observable<ComboBoxDashboardItemType> | A ComboBoxDashboardItemType value that specifies the type of the Combo Box dashboard item. |
showAllValue Property
Declaration
showAllValue: ko.Observable<boolean>Property Value
| Type |
|---|
| Observable<boolean> |