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DataGridColumn

Package | mx.controls.dataGridClasses
Class | public class DataGridColumn
Inheritance | DataGridColumn CSSStyleDeclaration flash.events.EventDispatcher
Implements | IIMESupport

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

The DataGridColumn class describes a column in a DataGrid control. There is one DataGridColumn per displayable column, even if a column is hidden or off-screen. The data provider items of a DataGrid control can contain properties that are not displayed and, therefore, do not need a DataGridColumn. A DataGridColumn allows specification of the color and font of the text in a column; what kind of component displays the data for the column; whether the column is editable, sortable, or resizable; and the text for the column header.

Notes:

- A DataGridColumn only holds information about a column; it is not the parent of the item renderers in the column.
- If you specify a DataGridColumn class without a `dataField` property, you must specify a `sortCompareFunction` property. Otherwise, sort operations may cause run-time errors.

MXML Syntax Show MXML Syntax
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You use the `<mx.DataGridColumn>` tag to configure a column of a DataGrid control. You specify the `<mx.DataGridColumn>` tag as a child of the columns property in MXML. The `<mx.DataGridColumn>` tag inherits all of the tag attributes of its superclass, and adds the following tag attributes:

      <mx:DataGridColumn
      Properties
        dataField="No default"
        dataTipField="No default"
        dataTipFunction="No default"
        editable="true|false"
        editorDataField="text"
        editorHeightOffset="0"
        editorUsesEnterKey="false|true"
        editorWidthOffset="0"
        editorXOffset="0"
        editorYOffset="0"
        headerRenderer="DataGridItemRenderer"
        headerText="No default"
        headerWordWrap="undefined"
        imeMode="null"
        itemEditor="TextInput"
        itemRenderer="DataGridItemRenderer"
        labelFunction="No default"
        minWidth="20"
        rendererIsEditor="false|true"
        resizable="true|false"
        showDataTips="false|true"
        sortable="true|false"
        sortCompareFunction="No default"
        sortDescending="false|true"
        visible="true|false"
        width="100"
        wordWrap="false|true"

      Styles
        backgroundColor="0xFFFFFF"
        color="No default."
        disabledColor="0xAAB3B3"
        fontAntiAliasType="advanced"
        fontFamily="No default"
        fontGridFitType="pixel"
        fontSharpness="0"
        fontSize="No default"
        fontStyle="normal|italic"
        fontThickness="0"
        fontWeight="normal|bold"
        headerStyleName="No default"
        paddingLeft="0"
        paddingRight="0"
        textAlign="right|center|left"
        textDecoration="none|underline"
        textIndent="0"
      />

See also

mx.controls.DataGrid
mx.styles.CSSStyleDeclaration

Public Properties
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| Property | Defined By
--- | --- | ---
|  | dataField : String The name of the field or property in the data provider item associated with the column. | DataGridColumn
|  | dataTipField : String The name of the field in the data provider to display as the datatip. | DataGridColumn
|  | dataTipFunction : Function Specifies a callback function to run on each item of the data provider to determine its dataTip. | DataGridColumn
|  | defaultFactory : Function This function, if it isn't null, is usually autogenerated by the MXML compiler. | CSSStyleDeclaration
|  | draggable : Boolean = true A flag that indicates whether the user is allowed to drag the column to a new position If true, the user can drag the the column headers to a new position | DataGridColumn
|  | editable : Boolean A flag that indicates whether the items in the column are editable. | DataGridColumn
|  | editorDataField : String = text The name of the property of the item editor that contains the new data for the list item. | DataGridColumn
|  | editorHeightOffset : Number = 0 The height of the item editor, in pixels, relative to the size of the item renderer. | DataGridColumn
|  | editorUsesEnterKey : Boolean = false A flag that indicates whether the item editor uses Enter key. | DataGridColumn
|  | editorWidthOffset : Number = 0 The width of the item editor, in pixels, relative to the size of the item renderer. | DataGridColumn
|  | editorXOffset : Number = 0 The x location of the upper-left corner of the item editor, in pixels, relative to the upper-left corner of the item. | DataGridColumn
|  | editorYOffset : Number = 0 The y location of the upper-left corner of the item editor, in pixels, relative to the upper-left corner of the item. | DataGridColumn
|  | enableIME : Boolean [read-only] A flag that indicates whether the IME should be enabled when the component receives focus. | DataGridColumn
|  | factory : Function This function, if it isn't null, is usually autogenerated by the MXML compiler. | CSSStyleDeclaration
|  | headerRenderer : IFactory The class factory for item renderer instances that display the column header for the column. | DataGridColumn
|  | headerText : String Text for the header of this column. | DataGridColumn
|  | headerWordWrap : * A flag that indicates whether text in the header will be word wrapped if it doesn't fit on one line. | DataGridColumn
|  | imeMode : String Specifies the IME (input method editor) mode. | DataGridColumn
|  | itemEditor : IFactory A class factory for the instances of the item editor to use for the column, when it is editable. | DataGridColumn
|  | itemRenderer : IFactory The class factory for item renderer instances that display the data for each item in the column. | DataGridColumn
|  | labelFunction : Function A function that determines the text to display in this column. | DataGridColumn
|  | minWidth : Number The minimum width of the column. | DataGridColumn
|  | nullItemRenderer : IFactory The class factory for item renderer instances that display the data for each item in the column. | DataGridColumn
|  | overrides : Object If the setStyle() method is called on a UIComponent or CSSStyleDeclaration at run time, this object stores the name/value pairs that were set; they override the name/value pairs in the objects produced by the methods specified by the defaultFactory and factory properties. | CSSStyleDeclaration
|  | rendererIsEditor : Boolean = false A flag that indicates that the item renderer is also an item editor. | DataGridColumn
|  | resizable : Boolean = true A flag that indicates whether the user is allowed to resize the width of the column. | DataGridColumn
|  | selector : CSSSelector This property is the base selector of a potential chain of selectors and conditions that are used to match CSS style declarations to components. | CSSStyleDeclaration
|  | selectorIndex : int = 0 The order this CSSStyleDeclaration was added to its StyleManager. | CSSStyleDeclaration
|  | showDataTips : * A flag that indicates whether the datatips are shown in the column. | DataGridColumn
|  | sortable : Boolean = true A flag that indicates whether the user can click on the header of this column to sort the data provider. | DataGridColumn
|  | sortCompareFunction : Function A callback function that gets called when sorting the data in the column. | DataGridColumn
|  | sortCompareType : String | DataGridColumn
|  | sortDescending : Boolean = false Indicates whether the column sort is in ascending order, false, or descending order, true. | DataGridColumn
|  | specificity : int [read-only] Determines the order of precedence when applying multiple style declarations to a component. | CSSStyleDeclaration
|  | subject : String [read-only] The subject describes the name of a component that may be a potential match for this style declaration. | CSSStyleDeclaration
|  | visible : Boolean A flag that indicates whethe the column is visible. | DataGridColumn
|  | width : Number The width of the column, in pixels. | DataGridColumn
|  | wordWrap : * A flag that indicates whether the text in a row of this column is word wrapped if it doesn't fit on one line. | DataGridColumn

Public Methods
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| Method | Defined By
--- | --- | ---
|  | DataGridColumn(columnName:String = null) Constructor. | DataGridColumn
|  | clearStyle(styleProp:String):void Clears a style property on this CSSStyleDeclaration. | CSSStyleDeclaration
|  | getItemRendererFactory(forHeader:Boolean, data:Object):IFactory Return the appropriate factory, using the default factory if none specified. | DataGridColumn
|  | getStyle(styleProp:String):* Gets the value for a specified style property, as determined solely by this CSSStyleDeclaration. | CSSStyleDeclaration
|  | itemToDataTip(data:Object):String Returns a String that the item renderer displays as the datatip for the given data object, based on the dataTipField and dataTipFunction properties. | DataGridColumn
|  | itemToLabel(data:Object):String Returns the String that the item renderer displays for the given data object. | DataGridColumn
|  | matchesStyleClient(object:IAdvancedStyleClient):Boolean Determines whether this style declaration applies to the given component based on a match of the selector chain. | CSSStyleDeclaration
|  | setStyle(styleProp:String, newValue:*):void Sets a style property on this CSSStyleDeclaration. | CSSStyleDeclaration

Styles

| Style | Description | Defined By
--- | --- | --- | ---
|  | backgroundColor | Type: uint Format: Color CSS Inheritance: no The Background color of the column. The default value is `undefined`, which means it uses the value of the `backgroundColor` style of the associated DataGrid control. The default value for the DataGrid control is `0xFFFFFF`. | DataGridColumn
|  | color | Type: uint Format: Color CSS Inheritance: yes Color of text in the component, including the component label. The default value for the Halo theme is `0x0B333C`. The default value for the Spark theme is `0x000000`. | DataGridColumn
|  | direction | Type: String CSS Inheritance: yes The directionality of the text displayed by the component. The allowed values are `"ltr"` for left-to-right text, as in Latin-style scripts, and `"rtl"` for right-to-left text, as in Arabic and Hebrew. FTE and TLF use this value in their bidirectional text layout algorithm, which maps Unicode character order to glyph order. Note: This style only applies when an MX component specifies UIFTETextField as its `textFieldClass`. The `direction` also affects the alignment of the text within the bounds of the TLFTextField. It does not, however, affect the the placement of the TLFTextField within the component. The default value is`"ltr"`. | DataGridColumn
|  | disabledColor | Type: uint Format: Color CSS Inheritance: yes Color of text in the component if it is disabled. The default value is`0xAAB3B3`. | DataGridColumn
|  | fontAntiAliasType | Type: String CSS Inheritance: yes Sets the `antiAliasType` property of internal TextFields. The possible values are `"normal"` (`flash.text.AntiAliasType.NORMAL`) and `"advanced"` (`flash.text.AntiAliasType.ADVANCED`). The default value is `"advanced"`, which enables advanced anti-aliasing for the font. Set to `"normal"` to disable the advanced anti-aliasing. This style has no effect for system fonts. This style applies to all the text in a TextField subcontrol; you cannot apply it to some characters and not others. The default value is`"advanced"`. See also flash.text.TextField flash.text.AntiAliasType | DataGridColumn
|  | fontFamily | Type: String CSS Inheritance: yes Name of the font to use. Unlike in a full CSS implementation, comma-separated lists are not supported. You can use any font family name. If you specify a generic font name, it is converted to an appropriate device font. The default font for the Halo theme is `"Verdana"`. The default font for the Spark theme is `"Arial"`. | DataGridColumn
|  | fontGridFitType | Type: String CSS Inheritance: yes Sets the `gridFitType` property of internal TextFields that represent text in Flex controls. The possible values are `"none"` (`flash.text.GridFitType.NONE`), `"pixel"` (`flash.text.GridFitType.PIXEL`), and `"subpixel"` (`flash.text.GridFitType.SUBPIXEL`). This property only applies when you are using an embedded font and the `fontAntiAliasType` property is set to `"advanced"`. This style has no effect for system fonts. This style applies to all the text in a TextField subcontrol; you can't apply it to some characters and not others. The default value is`"pixel"`. See also flash.text.TextField flash.text.GridFitType | DataGridColumn
|  | fontSharpness | Type: Number CSS Inheritance: yes Sets the `sharpness` property of internal TextFields that represent text in Flex controls. This property specifies the sharpness of the glyph edges. The possible values are Numbers from -400 through 400. This property only applies when you are using an embedded font and the `fontAntiAliasType` property is set to `"advanced"`. This style has no effect for system fonts. This style applies to all the text in a TextField subcontrol; you can't apply it to some characters and not others. The default value is`0`. See also flash.text.TextField | DataGridColumn
|  | fontSize | Type: Number Format: Length CSS Inheritance: yes Height of the text, in pixels. In the Halo theme, the default value is 10 for all controls except the ColorPicker control. For the Halo themed ColorPicker control, the default value is 11. In the Spark theme, the default value is 12 for all controls except the ColorPicker control. For the Spark themed ColorPicker control, the default value is 11. | DataGridColumn
|  | fontStyle | Type: String CSS Inheritance: yes Determines whether the text is italic font. Recognized values are `"normal"` and `"italic"`. The default value is`"normal"`. | DataGridColumn
|  | fontThickness | Type: Number CSS Inheritance: yes Sets the `thickness` property of internal TextFields that represent text in Flex controls. This property specifies the thickness of the glyph edges. The possible values are Numbers from -200 to 200. This property only applies when you are using an embedded font and the `fontAntiAliasType` property is set to `"advanced"`. This style has no effect on system fonts. This style applies to all the text in a TextField subcontrol; you can't apply it to some characters and not others. The default value is`0`. See also flash.text.TextField | DataGridColumn
|  | fontWeight | Type: String CSS Inheritance: yes Determines whether the text is boldface. Recognized values are `normal` and `bold`. The default value for Button controls is `bold`. The default value for all other controls is `normal`. | DataGridColumn
|  | headerStyleName | Type: String CSS Inheritance: no The name of a CSS style declaration for controlling other aspects of the appearance of the column headers. The default value is `undefined`, which means it uses the value of the `headerStyleName` style of the associated DataGrid control. The default value for the DataGrid control is `".dataGridStyles"`. | DataGridColumn
|  | kerning | Type: Boolean CSS Inheritance: yes A Boolean value that indicates whether kerning is enabled (`true`) or disabled (`false`). Kerning adjusts the gap between certain character pairs to improve readability, and should be used only when necessary, such as with headings in large fonts. Kerning is supported for embedded fonts only. Certain fonts, such as Verdana, and monospaced fonts, such as Courier New, do not support kerning. The default value is`false`. | DataGridColumn
|  | letterSpacing | Type: Number CSS Inheritance: yes The number of additional pixels to appear between each character. A positive value increases the character spacing beyond the normal spacing, while a negative value decreases it. The default value is`0`. | DataGridColumn
|  | locale | Type: String CSS Inheritance: yes The locale of the text displayed by this component. FTE and TLF use this locale to map Unicode characters to font glyphs and to find fallback fonts. Note: This style only applies when an MX component specifies UIFTETextField as its `textFieldClass`. The default value is`"en"`. | DataGridColumn
|  | paddingLeft | Type: Number Format: Length CSS Inheritance: no The number of pixels between the container's left border and its content area. The default value is`0`. | DataGridColumn
|  | paddingRight | Type: Number Format: Length CSS Inheritance: no The number of pixels between the container's right border and its content area. The default value is`0`. | DataGridColumn
|  | textAlign | Type: String CSS Inheritance: yes Alignment of text within a container. Possible values are `"left"`, `"right"`, or `"center"`. The default value for most components is `"left"`. For the FormItem component, the default value is `"right"`. For the Button, LinkButton, and AccordionHeader components, the default value is `"center"`, and this property is only recognized when the `labelPlacement` property is set to `"left"` or `"right"`. If `labelPlacement` is set to `"top"` or `"bottom"`, the text and any icon are centered. | DataGridColumn
|  | textDecoration | Type: String CSS Inheritance: yes Determines whether the text is underlined. Possible values are `"none"` and `"underline"`. The default value is`"none"`. | DataGridColumn
|  | textFieldClass | Type: Class CSS Inheritance: no The class implementing IUITextField that is used by this component to render text. It can be set to either the mx.core.UITextField class (to use the classic TextField class built into Flash Player) or the mx.core.UIFTETextField class (to use the Text Layout Framework to get improved text rendering, including bidirectional layout). The default value is`mx.core.UITextField`. | DataGridColumn
|  | textIndent | Type: Number Format: Length CSS Inheritance: yes Offset of first line of text from the left side of the container, in pixels. The default value is`0`. | DataGridColumn

Property Detail

dataField | property

`dataField:String`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

The name of the field or property in the data provider item associated with the column. Each DataGridColumn control requires this property and/or the `labelFunction` property to be set in order to calculate the displayable text for the item renderer. If the `dataField` and `labelFunction` properties are set, the data is displayed using the `labelFunction` and sorted using the `dataField`. If the property named in the `dataField` does not exist, the `sortCompareFunction` must be set for the sort to work correctly.

This value of this property is not necessarily the String that is displayed in the column header. This property is used only to access the data in the data provider. For more information, see the `headerText` property.

Implementation
`public function get dataField():String`
`public function set dataField(value:String):void`

See also

headerText

dataTipField | property |

`dataTipField:String`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

The name of the field in the data provider to display as the datatip. By default, the DataGrid control looks for a property named `label` on each data provider item and displays it. However, if the data provider does not contain a `label` property, you can set the `dataTipField` property to specify a different property. For example, you could set the value to "FullName" when a user views a set of people's names included from a database.

This property can be used as the source for data binding.

Implementation
`public function get dataTipField():String`
`public function set dataTipField(value:String):void`

dataTipFunction | property |

`dataTipFunction:Function`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

Specifies a callback function to run on each item of the data provider to determine its dataTip. This property is used by the `itemToDataTip` method.

By default the control looks for a property named `label` on each data provider item and displays it as its dataTip. However, some data providers do not have a `label` property nor do they have another property that you can use for displaying data in the rows. For example, you might have a data provider that contains a lastName and firstName fields, but you want to display full names as the dataTip. You can specify a function to the `dataTipFunction` property that returns a single String containing the value of both fields. You can also use the `dataTipFunction` property for handling formatting and localization.

The function must take a single Object parameter, containing the data provider element, and return a String.

This property can be used as the source for data binding.

Implementation
`public function get dataTipFunction():Function`
`public function set dataTipFunction(value:Function):void`

draggable | property |

`public var draggable:Boolean = true`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

A flag that indicates whether the user is allowed to drag the column to a new position If `true`, the user can drag the the column headers to a new position

The default value is `true`.

editable | property |

`editable:Boolean`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

A flag that indicates whether the items in the column are editable. If `true`, and the DataGrid's `editable` property is also `true`, the items in a column are editable and can be individually edited by clicking on an item or by navigating to the item by using the Tab and Arrow keys.

The default value is `true`.

Implementation
`public function get editable():Boolean`
`public function set editable(value:Boolean):void`

editorDataField | property |

`public var editorDataField:String = text`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

The name of the property of the item editor that contains the new data for the list item. For example, the default `itemEditor` is TextInput, so the default value of the `editorDataField` property is `"text"`, which specifies the `text` property of the TextInput control.

The default value is `"text"`.

editorHeightOffset | property |

`public var editorHeightOffset:Number = 0`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

The height of the item editor, in pixels, relative to the size of the item renderer. This property can be used to make the editor overlap the item renderer by a few pixels to compensate for a border around the editor. Note that changing these values while the editor is displayed will have no effect on the current editor, but will affect the next item renderer that opens an editor.

The default value is `0`.

editorUsesEnterKey | property |

`public var editorUsesEnterKey:Boolean = false`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

A flag that indicates whether the item editor uses Enter key. If `true` the item editor uses the Enter key and the DataGrid will not look for the Enter key and move the editor in response. Note that changing this value while the editor is displayed will have no effect on the current editor, but will affect the next item renderer that opens an editor.

The default value is `false.`.

editorWidthOffset | property |

`public var editorWidthOffset:Number = 0`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

The width of the item editor, in pixels, relative to the size of the item renderer. This property can be used to make the editor overlap the item renderer by a few pixels to compensate for a border around the editor. Note that changing these values while the editor is displayed will have no effect on the current editor, but will affect the next item renderer that opens an editor.

The default value is `0`.

editorXOffset | property |

`public var editorXOffset:Number = 0`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

The x location of the upper-left corner of the item editor, in pixels, relative to the upper-left corner of the item. This property can be used to make the editor overlap the item renderer by a few pixels to compensate for a border around the editor. Note that changing these values while the editor is displayed will have no effect on the current editor, but will affect the next item renderer that opens an editor.

The default value is `0`.

editorYOffset | property |

`public var editorYOffset:Number = 0`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

The y location of the upper-left corner of the item editor, in pixels, relative to the upper-left corner of the item. This property can be used to make the editor overlap the item renderer by a few pixels to compensate for a border around the editor. Note that changing these values while the editor is displayed will have no effect on the current editor, but will affect the next item renderer that opens an editor.

The default value is `0`.

enableIME | property |

`enableIME:Boolean` [read-only]

Language Version : | ActionScript 3.0

Product Version : | Flex 4

Runtime Versions : | Flash Player 10, AIR 1.5

A flag that indicates whether the IME should be enabled when the component receives focus. If an editor is up, it will set enableIME accordingly.

Implementation
`public function get enableIME():Boolean`

headerRenderer | property |

`headerRenderer:IFactory`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

The class factory for item renderer instances that display the column header for the column. You can specify a drop-in item renderer, an inline item renderer, or a custom item renderer component as the value of this property.

The default item renderer is the DataGridItemRenderer class, which displays the item data as text.

This property can be used as the source for data binding.

Implementation
`public function get headerRenderer():IFactory`
`public function set headerRenderer(value:IFactory):void`

headerText | property |

`headerText:String`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

Text for the header of this column. By default, the DataGrid control uses the value of the `dataField` property as the header text.

This property can be used as the source for data binding.

Implementation
`public function get headerText():String`
`public function set headerText(value:String):void`

headerWordWrap | property |

`headerWordWrap:*`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

A flag that indicates whether text in the header will be word wrapped if it doesn't fit on one line. If `undefined`, the DataGrid control's `wordWrap` property is used.

The default value is `undefined`.

Implementation
`public function get headerWordWrap():*`
`public function set headerWordWrap(value:any):void`

imeMode | property |

`imeMode:String`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

Specifies the IME (input method editor) mode. The IME enables users to enter text in Chinese, Japanese, and Korean. Flex sets the IME mode when the `itemFocusIn` event occurs, and sets it back to the previous value when the `itemFocusOut` event occurs. The flash.system.IMEConversionMode class defines constants for the valid values for this property.

The default value is null, in which case it uses the value of the DataGrid control's `imeMode` property.

Implementation
`public function get imeMode():String`
`public function set imeMode(value:String):void`

See also

flash.system.IMEConversionMode

itemEditor | property |

`public var itemEditor:IFactory`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

A class factory for the instances of the item editor to use for the column, when it is editable.

The default value is `new ClassFactory(mx.controls.TextInput)`.

itemRenderer | property |

`itemRenderer:IFactory`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

The class factory for item renderer instances that display the data for each item in the column. You can specify a drop-in item renderer, an inline item renderer, or a custom item renderer component as the value of this property.

The default item renderer is the DataGridItemRenderer class, which displays the item data as text.

This property can be used as the source for data binding.

Implementation
`public function get itemRenderer():IFactory`
`public function set itemRenderer(value:IFactory):void`

labelFunction | property |

`labelFunction:Function`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

A function that determines the text to display in this column. By default the column displays the text for the field in the data that matches the column name. However, sometimes you want to display text based on more than one field in the data, or display something that does not have the format that you want. In such a case you specify a callback function using `labelFunction`.

For the DataGrid control, the method signature has the following form:

    labelFunction(item:Object, column:DataGridColumn):String

Where `item` contains the DataGrid item object, and `column` specifies the DataGrid column.

A callback function might concatenate the firstName and lastName fields in the data, or do some custom formatting on a Date, or convert a number for the month into the string for the month.

This property can be used as the source for data binding.

Implementation
`public function get labelFunction():Function`
`public function set labelFunction(value:Function):void`

minWidth | property |

`minWidth:Number`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

The minimum width of the column.

The default value is `20`.

This property can be used as the source for data binding.

Implementation
`public function get minWidth():Number`
`public function set minWidth(value:Number):void`

nullItemRenderer | property |

`nullItemRenderer:IFactory`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

The class factory for item renderer instances that display the data for each item in the column. You can specify a drop-in item renderer, an inline item renderer, or a custom item renderer component as the value of this property.

The default item renderer is the DataGridItemRenderer class, which displays the item data as text.

This property can be used as the source for data binding.

Implementation
`public function get nullItemRenderer():IFactory`
`public function set nullItemRenderer(value:IFactory):void`

rendererIsEditor | property |

`public var rendererIsEditor:Boolean = false`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

A flag that indicates that the item renderer is also an item editor. If this property is `true`, Flex ignores the `itemEditor` property and uses the item renderer for that item as the editor.

The default value is `false`.

resizable | property |

`public var resizable:Boolean = true`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

A flag that indicates whether the user is allowed to resize the width of the column. If `true`, the user can drag the grid lines between the column headers to resize the column.

The default value is `true`.

showDataTips | property |

`showDataTips:*`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

A flag that indicates whether the datatips are shown in the column. If `true`, datatips are displayed for text in the rows. Datatips are tooltips designed to show the text that is too long for the row.

The default value is `false`.

Implementation
`public function get showDataTips():*`
`public function set showDataTips(value:any):void`

sortable | property |

`public var sortable:Boolean = true`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

A flag that indicates whether the user can click on the header of this column to sort the data provider. If this property and the DataGrid `sortableColumns` property are both `true`, the DataGrid control dispatches a `headerRelease` event when a user releases the mouse button on this column's header. If no other handler calls the `preventDefault()` method on the `headerRelease` event, the `dataField` property or `sortCompareFunction` in the column is used to reorder the items in the dataProvider.

The default value is `true`.

sortCompareFunction | property |

`sortCompareFunction:Function`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

A callback function that gets called when sorting the data in the column. If this property is not specified, the sort tries to use a basic string or number sort on the data. If the data is not a string or number or if the `dataField` property is not a valid property of the data provider, the sort does not work or will generate an exception. If you specify a value of the `labelFunction` property, you typically also provide a function to the `sortCompareFunction` property, unless sorting is not allowed on this column. That means you specify a function when the value from the column's `dataField` does not sort in the same way as the computed value from the `labelFunction` property.

The DataGrid control uses this function to sort the elements of the data provider collection. The function signature of the callback function takes two parameters and have the following form:

    mySortCompareFunction(obj1:Object, obj2:Object):int

`obj1` — A data element to compare.

`obj2` — Another data element to compare with obj1.

The function should return a value based on the comparison of the objects:

- -1 if obj1 should appear before obj2 in ascending order.
- 0 if obj1 = obj2.
- 1 if obj1 should appear after obj2 in ascending order.

Note: The `obj1` and `obj2` parameters are entire data provider elements and not just the data for the item.

The default value is `null`.

This property can be used as the source for data binding.

Implementation
`public function get sortCompareFunction():Function`
`public function set sortCompareFunction(value:Function):void`

sortCompareType | property |

`sortCompareType:String`

Language Version : | ActionScript 3.0

Product Version : | Flex 4.11

Runtime Versions : | Flash Player 11.8, AIR 3.8

This property can be used as the source for data binding.

Implementation
`public function get sortCompareType():String`
`public function set sortCompareType(value:String):void`

sortDescending | property |

`public var sortDescending:Boolean = false`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

Indicates whether the column sort is in ascending order, `false`, or `descending` order, true.

Setting this property does not start a sort; it only sets the sort direction. Click on the column header to perform the sort.

The default value is `false;`.

visible | property |

`visible:Boolean`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

A flag that indicates whethe the column is visible. If `true`, the column is visible.

The default value is `true`.

Implementation
`public function get visible():Boolean`
`public function set visible(value:Boolean):void`

width | property |

`width:Number`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

The width of the column, in pixels. If the DataGrid's `horizontalScrollPolicy` property is `false`, all visible columns must fit in the displayable area, and the DataGrid will not always honor the width of the columns if the total width of the columns is too small or too large for the displayable area.

The default value is `100`.

This property can be used as the source for data binding.

Implementation
`public function get width():Number`
`public function set width(value:Number):void`

wordWrap | property |

`wordWrap:*`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

A flag that indicates whether the text in a row of this column is word wrapped if it doesn't fit on one line. If `undefined`, the DataGrid control's `wordWrap` property is used.

Only takes effect if the `DataGrid.variableRowHeight` property is also `true`.

The default value is `undefined`.

Implementation
`public function get wordWrap():*`
`public function set wordWrap(value:any):void`
Constructor Detail

DataGridColumn | () | Constructor

`public function DataGridColumn(columnName:String = null)`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

Constructor.

Parameters

| `columnName:String` (default = `null`)`` — The name of the field in the data provider associated with the column, and the text for the header cell of this column. This is equivalent to setting the `dataField` and `headerText` properties.

Method Detail

getItemRendererFactory | () | method

`public function getItemRendererFactory(forHeader:Boolean, data:Object):IFactory`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

Return the appropriate factory, using the default factory if none specified.

Parameters

| `forHeader:Boolean` — `true` if this is a header renderer.
| `data:Object` — The data to be presented by the item renderer.

Returns

| `IFactory` — if `data` is null, the default item renderer, otherwis it returns the custom item renderer.

itemToDataTip | () | method |

`public function itemToDataTip(data:Object):String`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

Returns a String that the item renderer displays as the datatip for the given data object, based on the `dataTipField` and `dataTipFunction` properties. If the method cannot convert the parameter to a String, it returns a single space.

This method is for use by developers who are creating subclasses of the DataGridColumn class. It is not for use by application developers.

Parameters

| `data:Object` — Object to be rendered.

Returns

| `String` — Displayable String based on the data.

itemToLabel | () | method |

`public function itemToLabel(data:Object):String`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

Returns the String that the item renderer displays for the given data object. If the DataGridColumn or its DataGrid control has a non-null `labelFunction` property, it applies the function to the data object. Otherwise, the method extracts the contents of the field specified by the `dataField` property, or gets the string value of the data object. If the method cannot convert the parameter to a String, it returns a single space.

Parameters

| `data:Object` — Object to be rendered.

Returns

| `String` — Displayable String based on the data.

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