ComboBox class

ComboBox(client, oOptionsopt)

new ComboBox(client, oOptionsopt)

The ExComboBox/JS tool allows you to display a drop-down panel (Bezier, Calendar, Gantt, Gauge, Menu, OrgChart, Pivot, RadialMenu, Schedule, ScrollBar, Surface, SwimLane Tree or any other HTML element) once the user clicks a button. For instance, you can select a different item from a drop-down tree or list control, or you can select a different date from a drop-down calendar control. The ExComboBox/JS is a HTML standalone-component, written in JavaScript, that uses no third-party libraries.

Every option of the ComboBox.Options type has associated a property of the control. For instance, the option:

allowActions {string}, customizes the actions the user can perform once the user clicks or touches the control
is associated with the property:
AllowActions {string}, customizes the actions the user can perform once the user clicks or touches the control
which means that the following statements are equivalent:
oComboBox.Options = {allowActions: "d2"}
oComboBox.SetOptions({allowActions: "d2"})
oComboBox.AllowActions = "d2"
oComboBox.SetAllowActions("d2")
where oComboBox is an object of ComboBox type
Parameters:
Name Type Attributes Description
client any The client parameter indicates the control's client area as:
  • array of [x,y,width,height] type that specifies the control's client area
  • string, that specifies the identifier of the canvas within the document, so the canvas's client area becomes the control's client area
  • HTMLCanvasElement, that specifies the identifier of the canvas within the document, so the canvas's client area becomes the control's client area
oOptions object <optional>
 An object of ComboBox.Options type that defines different options to display the control.
Requires:
  • module:exontrol.commmon.min.js
ComboBox

Requires

  • module:exontrol.commmon.min.js

Classes

Options

Members

Listeners :exontrol.Lts

The Listeners field defines the items of the control, as an object of exontrol.Lts type. The exontrol.Lts type supports forEach(callback, thisArg) method that helps you to enumerate the items the control supports. The Items section lists the items the component supports.
Type:
  • exontrol.Lts
Example
The following sample shows how you can get all items the component currently supports:

oComboBox.Listeners.forEach(function(name)
{
 console.log(name);
});

The following sample displays information about the item being clicked:

oComboBox.Listeners.Add("onclick", function (oEvent)
{
 console.log(oEvent);
});

where oComboBox is an object of ComboBox type
Listeners

Shortcuts :exontrol.Sts

The Shortcuts field defines the shortcuts of the control, as an object of exontrol.Sts type. In order to provide keyboard support for the component, the owner <canvas> element must include the tabIndex attribute, as <canvas ... tabIndex="0">. You can associated a function or a callback to any shortcut.
Type:
  • exontrol.Sts
Shortcuts

oCV :CV

The oCV field defines the base combobox-view of control.
Type:
oCV

(static) type :string

The type field defines the full-name of the object (the constructor.name does not give the same name for minimized forms). The ComboBox.type member always returns "ComboBox"
Type:
  • string
Since:
  • 1.8

(static) version :string

The version field defines the version of the control. The current version is 3.0
Type:
  • string

Methods

BeginUpdate()

The BeginUpdate() method suspends the control's render until the EndUpdate() method is called. It maintains performance, while multiple changes occurs within the control. You can use the Update() method to perform multiple changes at once.
BeginUpdate

EndUpdate()

The EndUpdate() method resumes the control's render, after it is suspended by the BeginUpdate() method.
EndUpdate

GetCanvas() → {HTMLCanvasElement}

The GetCanvas() method returns the HTMLCanvasElement object where the control is currently running on.
Since:
  • 3.0
Returns:
Returns the HTMLCanvasElement object where the control is currently running on.
Type
HTMLCanvasElement
GetCanvas

GetLayout(oOptsopt) → {string}

The GetLayout() method saves the UI layout of the object to an encoded string. The layout can be restored using the SetLayout() method. Currently, the control's Layout property serializes the following:
  • layout of windows (size, dock, parent)
  • size of the drop-down panel
  • properties of the control being hosted by the drop-down panel
Parameters:
Name Type Attributes Description
oOpts object <optional>
 An object of {iMask,eMask,base64,equal,eol} type that defines options to serialize the properties of the container as explained bellow:
  • iMask {string}, specifies the mask (can include ? or * wild-characters) of properties to save
  • eMask {string}, specifies the mask (can include ? or * wild-characters) of properties to exclude from save
  • base64 {boolean}, Encodes the result to BASE 64
  • equal {string}, Indicates the separator between the name and the value. If missing, the = character is used
  • eol {string}, A character that separates the properties. By default it is "\n"
Returns:
Returns a string that encodes the current UI layout for the entire object
Type
string
Example
The following statements are equivalents:

 oComboBox.GetLayout(), gets the control's layout
 oComboBox.Layout, gets the control's layout

where oComboBox is an object of ComboBox type
GetLayout

GetStatistics() → {string}

The GetStatistics() method gives statistics data of objects being hold by the control
Returns:
Returns statistics data of objects being hold by the control such as:
Size: 1,536x754
Zoom: 100%
Type
string
Example
The following statements are equivalents:

 oComboBox.GetStatistics(), gives statistics data of objects being hold by the control
 oComboBox.Statistics, gives statistics data of objects being hold by the control

where oComboBox is an object of ComboBox type
GetStatistics

Refresh()

The Refresh() method refreshes the control
Refresh

SetLayout(layout, oOptsopt)

The SetLayout() method restores the UI layout of the object from an encoded string, previously returned by the GetLayout() method. Currently, the control's Layout property serializes the following:
  • layout of windows (size, dock, parent)
  • size of the drop-down panel
  • properties of the control being hosted by the drop-down panel
Parameters:
Name Type Attributes Description
layout string A string expression that defines the UI layout to apply
oOpts object <optional>
 An object of {iMask,eMask,base64,equal,eol} type that defines options to serialize the UI layout as explained bellow:
  • iMask {string}, specifies the mask (can include ? or * wild-characters) of properties to load
  • eMask {string}, specifies the mask (can include ? or * wild-characters) of properties to exclude from load
  • base64 {boolean}, Decodes the layout from BASE 64
  • equal {string}, Indicates the separator between the name and the value. If missing, the = character is used
  • eol {string}, A sequence of characters that can separate the properties. By default, any of \n, \r or ; separates the properties
SetLayout

Update(callback, thisArgopt)

The Update() method locks the control's paint during the callback, and invalidates the control once the method ends.
Parameters:
Name Type Attributes Description
callback callback Indicates a callback to perform changes within the control
thisArg any <optional>
 Specifies the value of "this" keyword during the callback. If missing/empty/undefined the thisArg points to the control itself, as an object of ComboBox type
Update