| Package | spark.components.gridClasses |
| Class | public class GridColumn |
| Inheritance | GridColumn  EventDispatcher Object |
| Language Version: | ActionScript 3.0 |
| Product Version: | Flex 4.5 |
| Runtime Versions: | Flash Player 10, AIR 2.5 |
Show MXML Syntax
Hide MXML SyntaxThe <s:GridColumn> tag inherits all of the tag
attributes of its superclass and adds the following tag attributes:
<s:GridColumn
Properties
dataField="null"
dataTipField="null"
dataTipFormatter="null"
dataTipFunction="null"
editable="true"
formatter="null"
headerRenderer="null"
headerText="value of dataField"
imeMode="null"
itemEditor="null"
itemRenderer="null"
itemRendererFunction="null"
labelFunction="null"
maxWidth="NaN"
minWidth="20"
rendererIsEditable="false"
resizeable="true"
showDataTips="undefined"
sortable="true"
sortCompareFunction="null"
sortDescending="false"
visible="true"
width="NaN"
/>
More examples
Related API Elements
| Property | Defined By | ||
|---|---|---|---|
| columnIndex : int [read-only]
The position of this column in the grid's column list,
or -1 if this column's grid is null. | GridColumn | ||
 | constructor : Object
A reference to the class object or constructor function for a given object instance. | Object | |
| dataField : String
The name of the field or property in the data provider item associated
with the column. | GridColumn | ||
| dataTipField : String
The name of the field in the data provider to display as the datatip. | GridColumn | ||
| dataTipFormatter : IFormatter
Specifies the formatter used by the column's itemToDataTip() method to
convert data provider items to Strings. | GridColumn | ||
| dataTipFunction : Function
Specifies a callback function to run on each item of the data provider
to determine its data tip. | GridColumn | ||
| editable : Boolean
Indicates whether the items in the column are editable. | GridColumn | ||
| formatter : IFormatter
Specifies the formatter used by the column's itemToLabel() method to
convert data provider items to strings. | GridColumn | ||
| grid : Grid [read-only]
The Grid object associated with this column. | GridColumn | ||
| headerRenderer : IFactory
The class factory for the IGridItemRenderer class used as
the header for this column. | GridColumn | ||
| headerText : String
Text for the header of this column. | GridColumn | ||
| imeMode : String
Specifies the IME (Input Method Editor) mode. | GridColumn | ||
| itemEditor : IFactory
A class factory for IGridItemEditor class used to edit individual
grid cells in this column. | GridColumn | ||
| itemRenderer : IFactory
The class factory for the IGridItemRenderer class used to
render individual grid cells. | GridColumn | ||
| itemRendererFunction : Function
If specified, the value of this property must be an idempotent function
that returns an item renderer IFactory based on its data provider item
and column parameters. | GridColumn | ||
| labelFunction : Function
An idempotent function that converts a data provider item into a column-specific string
that's used to initialize the item renderer's label property. | GridColumn | ||
| maxWidth : Number
The maximum width of this column in pixels. | GridColumn | ||
| minWidth : Number
The minimum width of this column in pixels. | GridColumn | ||
| rendererIsEditable : Boolean
Determines whether any of the item renderer's controls are editable. | GridColumn | ||
| resizable : Boolean
Indicates whether the user is allowed to resize
the width of the column. | GridColumn | ||
| showDataTips : *
Indicates whether the datatips are shown in the column. | GridColumn | ||
| sortable : Boolean
If true, and if the grid's data provider is an ICollectionView,
and if the associated grid's sortableColumns property is true,
then this column supports interactive sorting. | GridColumn | ||
| sortCompareFunction : Function
The function that compares two elements during a sort of on the
data elements of this column. | GridColumn | ||
| sortDescending : Boolean
If true, this column is sorted in descending order. | GridColumn | ||
| sortField : SortField [read-only]
Returns a SortField that can be used to sort a collection by this
column's dataField. | GridColumn | ||
| visible : Boolean
If true, then display this column. | GridColumn | ||
| width : Number
The width of this column in pixels. | GridColumn | ||
| Method | Defined By | ||
|---|---|---|---|
GridColumn(columnName:String = null)
Constructor. | GridColumn | ||
| addEventListener(type:String, listener:Function, useCapture:Boolean = false, priority:int = 0, useWeakReference:Boolean = false):void
Registers an event listener object with an EventDispatcher object so that the listener
receives notification of an event. | EventDispatcher | |
|
Dispatches an event into the event flow. | EventDispatcher | |
|
Checks whether the EventDispatcher object has any listeners registered for a specific type
of event. | EventDispatcher | |
|
Indicates whether an object has a specified property defined. | Object | |
|
Indicates whether an instance of the Object class is in the prototype chain of the object specified
as the parameter. | Object | |
Convert the specified data provider item to a column-specific datatip String. | GridColumn | ||
Convert the specified data provider item to a column-specific String. | GridColumn | ||
Convert the specified data provider item to a column-specific item renderer factory. | GridColumn | ||
|
Indicates whether the specified property exists and is enumerable. | Object | |
|
Removes a listener from the EventDispatcher object. | EventDispatcher | |
|
Sets the availability of a dynamic property for loop operations. | Object | |
|
Returns the string representation of this object, formatted according to locale-specific conventions. | Object | |
|
Returns the string representation of the specified object. | Object | |
|
Returns the primitive value of the specified object. | Object | |
|
Checks whether an event listener is registered with this EventDispatcher object or any of
its ancestors for the specified event type. | EventDispatcher | |
| Constant | Defined By | ||
|---|---|---|---|
| ERROR_TEXT : String = "unknown" [static]
The return value for the itemToLabel() or
itemToDataTip() method if resolving the corresponding
property name (path) fails. | GridColumn | ||
columnIndex | property |
columnIndex:int [read-only] | Language Version: | ActionScript 3.0 |
| Product Version: | Flex 4.5 |
| Runtime Versions: | Flash Player 10, AIR 2.5 |
The position of this column in the grid's column list, or -1 if this column's grid is null.
This property can be used as the source for data binding. When this property is modified, it dispatches the columnIndexChanged event.
Implementation
public function get columnIndex():intdataField | property |
dataField:String| Language Version: | ActionScript 3.0 |
| Product Version: | Flex 4.5 |
| Runtime Versions: | Flash Player 10, AIR 2.5 |
The name of the field or property in the data provider item associated
with the column.
Each GridColumn requires this property or
the labelFunction property to be set
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.
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.
If the column or its grid specifies a labelFunction,
then the dataField is not used.
The default value is null.
This property can be used as the source for data binding. When this property is modified, it dispatches the dataFieldChanged event.
Implementation
public function get dataField():String public function set dataField(value:String):voidRelated API Elements
dataTipField | property |
dataTipField:String| Language Version: | ActionScript 3.0 |
| Product Version: | Flex 4.5 |
| Runtime Versions: | Flash Player 10, AIR 2.5 |
The name of the field in the data provider to display as the datatip.
By default, if showDataTips is true,
the associated grid 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 name.
For example, you could set the value to "FullName" when a user views a
set of people's names included from a database.
GridColumn.dataTipField takes precedence over this property.
If this column or its grid specifies a value for the
dataTipFunction property, then the
dataTipField property is ignored.
The default value is null.
This property can be used as the source for data binding. When this property is modified, it dispatches the dataTipFieldChanged event.
Implementation
public function get dataTipField():String public function set dataTipField(value:String):voidRelated API Elements
dataTipFormatter | property |
dataTipFormatter:IFormatter| Language Version: | ActionScript 3.0 |
| Product Version: | Flex 4.5 |
| Runtime Versions: | Flash Player 10, AIR 2.5 |
Specifies the formatter used by the column's itemToDataTip() method to
convert data provider items to Strings.
If the formatter's styleParent was not specified, it's set
to the column's grid, so that the formatter inherits the grid's locale style.
The default value is null.
This property can be used as the source for data binding. When this property is modified, it dispatches the dataTipFormatterChanged event.
Implementation
public function get dataTipFormatter():IFormatter public function set dataTipFormatter(value:IFormatter):voidRelated API Elements
dataTipFunction | property |
dataTipFunction:Function| Language Version: | ActionScript 3.0 |
| Product Version: | Flex 4.5 |
| Runtime Versions: | Flash Player 10, AIR 2.5 |
Specifies a callback function to run on each item of the data provider
to determine its data tip.
This property is used by the itemToDataTip method.
By default, if showDataTips is true,
the column looks for a property named label
on each data provider item and displays it as its data tip.
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 have a data provider that contains a lastName
and firstName fields, but you want to display full names as the data tip.
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 signature of the dataTipFunction function must match the following:
dataTipFunction(item:Object, column:GridColumn):StringThe
item parameter is the data provider item for an entire row.
The second parameter is this column object.
A typical function might concatenate an item's firstName and lastName properties, or do some custom formatting on a Date value property.
The default value is null.
This property can be used as the source for data binding. When this property is modified, it dispatches the dataTipFunctionChanged event.
Implementation
public function get dataTipFunction():Function public function set dataTipFunction(value:Function):voidRelated API Elements
editable | property |
editable:Boolean| Language Version: | ActionScript 3.0 |
| Product Version: | Flex 4.5 |
| Runtime Versions: | Flash Player 10, AIR 2.5 |
Indicates whether the items in the column are editable.
If true, and the associated grid's editable
property is also true, the items in a column are
editable and can be individually edited
by clicking on a selected item, or by navigating to the item and
pressing the F2 key.
The default value is true.
This property can be used as the source for data binding. When this property is modified, it dispatches the editableChanged event.
Implementation
public function get editable():Boolean public function set editable(value:Boolean):voidformatter | property |
formatter:IFormatter| Language Version: | ActionScript 3.0 |
| Product Version: | Flex 4.5 |
| Runtime Versions: | Flash Player 10, AIR 2.5 |
Specifies the formatter used by the column's itemToLabel() method to
convert data provider items to strings.
If the formatter's styleParent was not specified, it's set
to the column's grid, so that the formatter inherits the grid's locale style.
The default value is null.
This property can be used as the source for data binding. When this property is modified, it dispatches the formatterChanged event.
Implementation
public function get formatter():IFormatter public function set formatter(value:IFormatter):voidRelated API Elements
grid | property |
grid:Grid [read-only] | Language Version: | ActionScript 3.0 |
| Product Version: | Flex 4.5 |
| Runtime Versions: | Flash Player 10, AIR 2.5 |
The Grid object associated with this column.
This property can be used as the source for data binding. When this property is modified, it dispatches the gridChanged event.
Implementation
public function get grid():GridheaderRenderer | property |
headerRenderer:IFactory| Language Version: | ActionScript 3.0 |
| Product Version: | Flex 4.5 |
| Runtime Versions: | Flash Player 10, AIR 2.5 |
The class factory for the IGridItemRenderer class used as
the header for this column.
If unspecified, the DataGrid controls's columnHeaderGroup
skin part defines the default header renderer.
The default value is null.
This property can be used as the source for data binding. When this property is modified, it dispatches the headerRendererChanged event.
Implementation
public function get headerRenderer():IFactory public function set headerRenderer(value:IFactory):voidRelated API Elements
headerText | property |
headerText:String| Language Version: | ActionScript 3.0 |
| Product Version: | Flex 4.5 |
| Runtime Versions: | Flash Player 10, AIR 2.5 |
Text for the header of this column.
By default, the associated grid control uses the value of
the dataField property as the header text.
This property can be used as the source for data binding. When this property is modified, it dispatches the headerTextChanged event.
Implementation
public function get headerText():String public function set headerText(value:String):voidimeMode | property |
imeMode:String| Language Version: | ActionScript 3.0 |
| Product Version: | Flex 4.5 |
| Runtime Versions: | Flash Player 10, AIR 2.5 |
Specifies the IME (Input Method Editor) mode. The IME enables users to enter text in Chinese, Japanese, and Korean. Flex sets the specified IME mode when the control gets the focus, and sets it back to the previous value when the control loses the focus.
The flash.system.IMEConversionMode class defines constants for the
valid values for this property.
You can also specify null to specify no IME.
The default value is null.
Implementation
public function get imeMode():String public function set imeMode(value:String):voidRelated API Elements
itemEditor | property |
itemEditor:IFactory| Language Version: | ActionScript 3.0 |
| Product Version: | Flex 4.5 |
| Runtime Versions: | Flash Player 10, AIR 2.5 |
A class factory for IGridItemEditor class used to edit individual
grid cells in this column.
If this property is null, and the column grid's owner is a DataGrid control,
then the value of the DataGrid control's itemEditor property is used.
If no item editor is specified by the DataGrid control,
then use the DefaultGridItemEditor class.
The default item editor is the DefaultGridItemEditor class, which lets you edit a simple text field. You can create custom item renderers by creating a subclass of the GridItemEditor class. Your custom item editor can write data to the entire row of the grid to define more complex editor.
The default value is null.
This property can be used as the source for data binding. When this property is modified, it dispatches the itemEditorChanged event.
Implementation
public function get itemEditor():IFactory public function set itemEditor(value:IFactory):voidRelated API Elements
itemRenderer | property |
itemRenderer:IFactory| Language Version: | ActionScript 3.0 |
| Product Version: | Flex 4.5 |
| Runtime Versions: | Flash Player 10, AIR 2.5 |
The class factory for the IGridItemRenderer class used to
render individual grid cells.
If not specified, use the value of the itemRenderer
property from the associated grid control.
The default item renderer is the DefaultGridItemRenderer class, which displays the data item as text. You can create custom item renderers by creating a subclass of the GridItemRenderer class. Your custom item renderer can access the data from the entire row of the grid to define more complex visual representation of the cell.
The default value is the value of the itemRenderer
property from the associated grid control, or null.
This property can be used as the source for data binding. When this property is modified, it dispatches the itemRendererChanged event.
Implementation
public function get itemRenderer():IFactory public function set itemRenderer(value:IFactory):voidRelated API Elements
itemRendererFunction | property |
itemRendererFunction:Function| Language Version: | ActionScript 3.0 |
| Product Version: | Flex 4.5 |
| Runtime Versions: | Flash Player 10, AIR 2.5 |
If specified, the value of this property must be an idempotent function
that returns an item renderer IFactory based on its data provider item
and column parameters.
Specifying a value to the itemRendererFunction property
makes it possible to use more than one item renderer in this column.
The function specified to the itemRendererFunction property
must have the following signature:
itemRendererFunction(item:Object, column:GridColumn):IFactory
The item parameter is the data provider item for an entire row.
The second parameter is this column object.
Shown below is an example of an item renderer function:
function myItemRendererFunction(item:Object, column:GridColumn):IFactory
{
return (item is Array) ? myArrayItemRenderer : myItemRenderer;
}
The default value is null.
This property can be used as the source for data binding. When this property is modified, it dispatches the itemRendererFunctionChanged event.
Implementation
public function get itemRendererFunction():Function public function set itemRendererFunction(value:Function):voidlabelFunction | property |
labelFunction:Function| Language Version: | ActionScript 3.0 |
| Product Version: | Flex 4.5 |
| Runtime Versions: | Flash Player 10, AIR 2.5 |
An idempotent function that converts a data provider item into a column-specific string
that's used to initialize the item renderer's label property.
You can use a label function to combine the values of several data provider items
into a single string.
If specified, this property is used by the
itemToLabel() method, which computes the value of each item
renderer's label property in this column.
The function specified to the labelFunction property
must have the following signature:
labelFunction(item:Object, column:GridColumn):String
The item parameter is the data provider item for an entire row.
The second parameter is this column object.
A typical label function could concatenate the firstName and lastName properties of the data provider item , or do some custom formatting on a Date value property.
The default value is null.
This property can be used as the source for data binding. When this property is modified, it dispatches the labelFunctionChanged event.
Implementation
public function get labelFunction():Function public function set labelFunction(value:Function):voidRelated API Elements
maxWidth | property |
maxWidth:Number| Language Version: | ActionScript 3.0 |
| Product Version: | Flex 4.5 |
| Runtime Versions: | Flash Player 10, AIR 2.5 |
The maximum width of this column in pixels.
If specified, the grid's layout makes the column's layout width the
smaller of the width of the typicalItem and the maxWidth.
If this column is resizable, this property limits how wide the user can make this column.
Setting this property does not change the width
or minWidth properties.
The default value is NaN.
This property can be used as the source for data binding. When this property is modified, it dispatches the maxWidthChanged event.
Implementation
public function get maxWidth():Number public function set maxWidth(value:Number):voidminWidth | property |
minWidth:Number| Language Version: | ActionScript 3.0 |
| Product Version: | Flex 4.5 |
| Runtime Versions: | Flash Player 10, AIR 2.5 |
The minimum width of this column in pixels.
If specified, the grid's layout makes the column's layout
width the larger of the width of the typicalItem and
the minWidth.
If this column is resizable, this property limits how small
the user can make this column.
Setting this property does not change the width
or maxWidth properties.
The default value is 20.
This property can be used as the source for data binding. When this property is modified, it dispatches the minWidthChanged event.
Implementation
public function get minWidth():Number public function set minWidth(value:Number):voidrendererIsEditable | property |
rendererIsEditable:Boolean| Language Version: | ActionScript 3.0 |
| Product Version: | Flex 4.5 |
| Runtime Versions: | Flash Player 10, AIR 2.5 |
Determines whether any of the item renderer's controls are editable. If the column is editable, the focusable controls in the item renderer are given keyboard focus when the user starts editing the item renderer.
When you set this property to true, the cell becomes
editable when the user clicks inside of it.
Because the cell is editable, the DataGrid displays the editorIndicator
skin part, which appears on top of the selectionIndicator skin part.
Therefore, the user does not see an indicator for cell selection until the
edit session is complete.
You can create a custom skin to remove or modify the editorIndicator
skin part so that the selectionIndicator skin part appears.
For example, you can set alpha property of the editorIndicator
to allow the selectionIndicator to show through, or change
the size of the editorIndicator so that it is smaller than the cell.
By setting this property to true, you take responsibility for
validating and saving input collected by the item renderer.
If the item renderer contains an override of the IGridItemRenderer.prepare() method,
then you must ensure that unsaved input field changes are not overwritten.
For example, rendererIsEditable is true
and the renderer contains a single TextInput element that displays
the value of data.myDataField.
If the renderer's prepare() method sets the TextInput control's
text property, then the prepare() method must
not set the text property when there are pending changes.
The default value is false.
This property can be used as the source for data binding. When this property is modified, it dispatches the rendererIsEditableChanged event.
Implementation
public function get rendererIsEditable():Boolean public function set rendererIsEditable(value:Boolean):voidresizable | property |
resizable:Boolean| Language Version: | ActionScript 3.0 |
| Product Version: | Flex 4.5 |
| Runtime Versions: | Flash Player 10, AIR 2.5 |
Indicates whether the user is allowed to resize
the width of the column.
If true, and the resizableColumns property of
the associated grid is also true, the user can drag
the grid lines between the column headers to resize the column.
The default value is true.
This property can be used as the source for data binding. When this property is modified, it dispatches the resizableChanged event.
Implementation
public function get resizable():Boolean public function set resizable(value:Boolean):voidshowDataTips | property |
showDataTips:*| Language Version: | ActionScript 3.0 |
| Product Version: | Flex 4.5 |
| Runtime Versions: | Flash Player 10, AIR 2.5 |
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.
If this property's value is undefined, the default, then the associated
grid's showDataTips property determines if datatips are shown.
If this property is set, the grid's showDataTips property is ignored.
The default value is undefined.
This property can be used as the source for data binding. When this property is modified, it dispatches the showDataTipsChanged event.
Implementation
public function get showDataTips():* public function set showDataTips(value:any):voidRelated API Elements
sortable | property |
sortable:Boolean| Language Version: | ActionScript 3.0 |
| Product Version: | Flex 4.5 |
| Runtime Versions: | Flash Player 10, AIR 2.5 |
If true, and if the grid's data provider is an ICollectionView,
and if the associated grid's sortableColumns property is true,
then this column supports interactive sorting.
Typically the column's header handles mouse clicks by setting the data provider's
sort property to a Sort object whose SortField is this column's dataField.
If the data provider is not an ICollectionView, then this property has no effect.
The default value is true.
This property can be used as the source for data binding. When this property is modified, it dispatches the sortableChanged event.
Implementation
public function get sortable():Boolean public function set sortable(value:Boolean):voidsortCompareFunction | property |
sortCompareFunction:Function| Language Version: | ActionScript 3.0 |
| Product Version: | Flex 4.5 |
| Runtime Versions: | Flash Player 10, AIR 2.5 |
The function that compares two elements during a sort of on the
data elements of this column.
If you specify a value of the labelFunction property,
you typically also provide a sortCompareFunction.
The sortCompareFunction's signature must match the following:
sortCompareFunction(obj1:Object, obj2:Object, column:GridColumn):int
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.
The function may use the column parameter to write generic compare functions.
Note: The obj1 and
obj2 parameters are entire data provider elements and not
just the data for the item.
If the dataProvider is not an ICollectionView, then this property has no effect.
The default value is null.
This property can be used as the source for data binding. When this property is modified, it dispatches the sortCompareFunctionChanged event.
Implementation
public function get sortCompareFunction():Function public function set sortCompareFunction(value:Function):voidsortDescending | property |
sortDescending:Boolean| Language Version: | ActionScript 3.0 |
| Product Version: | Flex 4.5 |
| Runtime Versions: | Flash Player 10, AIR 2.5 |
If true, this column is sorted in descending order.
For example, if the column's dataField contains a numeric value,
then the first row would be the one with the largest value
for this column.
Setting this property does not start a sort; it only sets the sort direction.
When the dataProvider.refresh() method is called, the sort is performed.
If the data provider is not an ICollectionView, then this property has no effect.
The default value is false.
This property can be used as the source for data binding. When this property is modified, it dispatches the sortDescendingChanged event.
Implementation
public function get sortDescending():Boolean public function set sortDescending(value:Boolean):voidsortField | property |
sortField:SortField [read-only] | Language Version: | ActionScript 3.0 |
| Product Version: | Flex 4.5 |
| Runtime Versions: | Flash Player 10, AIR 2.5 |
Returns a SortField that can be used to sort a collection by this
column's dataField.
If the sortCompareFunction property is defined,
then the SortField's compareFunction is automatically set.
If the sortCompareFunction property is not defined
and the dataField is complex, then the SortField's
compare function is assigned to a closure around a default compare
function that handles the complex dataField.
If the sortCompareFunction and
dataField properties are not defined, but the
labelFunction property is defined, then it assigns the
compareFunction to a closure that does a basic string compare
on the labelFunction applied to the data objects.
Implementation
public function get sortField():SortFieldRelated API Elements
visible | property |
visible:Boolean| Language Version: | ActionScript 3.0 |
| Product Version: | Flex 4.5 |
| Runtime Versions: | Flash Player 10, AIR 2.5 |
If true, then display this column.
If false, no space will be allocated
for this column; it will not be included in the layout.
The default value is true.
This property can be used as the source for data binding. When this property is modified, it dispatches the visibleChanged event.
Implementation
public function get visible():Boolean public function set visible(value:Boolean):voidwidth | property |
width:Number| Language Version: | ActionScript 3.0 |
| Product Version: | Flex 4.5 |
| Runtime Versions: | Flash Player 10, AIR 2.5 |
The width of this column in pixels.
If specified, the grid's layout ignores its
typicalItem property and this column's
minWidth and maxWidth properties.
The default value is NaN.
This property can be used as the source for data binding. When this property is modified, it dispatches the widthChanged event.
Implementation
public function get width():Number public function set width(value:Number):voidGridColumn | () | Constructor |
itemToDataTip | () | method |
public function itemToDataTip(item:Object):String| Language Version: | ActionScript 3.0 |
| Product Version: | Flex 4.5 |
| Runtime Versions: | Flash Player 10, AIR 2.5 |
Convert the specified data provider item to a column-specific datatip String.
This method uses the values dataTipField
and dataTipFunction.
If those properties are null, it uses the corresponding properties
from the associated grid control.
If dataTipField properties is also null in the grid control,
then use the dataField property.
If dataTipFunction and dataTipFormatter are
null, then this method's value is the same as:
item[dataTipField].toString(). If dataTipFormatter is
specified then this method's value is the same as:
dataTipFormatter.format(item[dataTipField])
If resolving the item's dataField
causes an error to be thrown, ERROR_TEXT is returned.
If item and dataTipFunction
are not null, then this method returns
dataTipFunction(item, this), where the second argument is
this GridColumn.
Parameters
item:Object — The value of grid.dataProvider.getItemAt(rowIndex).
|
String — A column-specific string for the specified data provider item
or ERROR_TEXT.
|
itemToLabel | () | method |
public function itemToLabel(item:Object):String| Language Version: | ActionScript 3.0 |
| Product Version: | Flex 4.5 |
| Runtime Versions: | Flash Player 10, AIR 2.5 |
Convert the specified data provider item to a column-specific String.
This method is used to initialize item renderers' label property.
If labelFunction is null, and dataField
is a string that does not contain "." field name separator characters,
and formatter is null, then this method is equivalent to:
item[dataField].toString()
If the formatter was specified, then this method's value is:
formatter.format(item[dataField])
If dataField is a "." separated
path, then this method looks up each successive path element.
For example if ="foo.bar.baz", then this method returns
a string based on the value of item.foo.bar.baz.
If resolving the item's dataField
causes an error to be thrown, ERROR_TEXT is returned.
If item and labelFunction are not null,
then this method returns labelFunction(item, this),
where the second argument is this GridColumn.
Parameters
item:Object — The value of grid.dataProvider.getItemAt(rowIndex).
|
String — A column-specific string for the specified dataProvider item or ERROR_TEXT.
|
itemToRenderer | () | method |
public function itemToRenderer(item:Object):IFactory| Language Version: | ActionScript 3.0 |
| Product Version: | Flex 4.5 |
| Runtime Versions: | Flash Player 10, AIR 2.5 |
Convert the specified data provider item to a column-specific item renderer factory.
By default this method calls the itemRendererFunction if it's
non-null, otherwise it just returns the value of the column's itemRenderer
property.
Parameters
item:Object — The value of grid.dataProvider.getItemAt(rowIndex).
|
IFactory — A column-specific item renderer factory for the specified dataProvider item.
|
ERROR_TEXT | Constant |
public static const ERROR_TEXT:String = "unknown"| Language Version: | ActionScript 3.0 |
| Product Version: | Flex 4.5 |
| Runtime Versions: | Flash Player 10, AIR 2.5 |
The return value for the itemToLabel() or
itemToDataTip() method if resolving the corresponding
property name (path) fails.
The value of this constant is a single space String: " ".
Related API Elements
<?xml version="1.0" encoding="utf-8"?>
<!--
A simple example of a DataGrid with explicitly specified columns.
The DataGrid's columns are specified by an ArrayList (an IList) and can always be accessed as such.
For example dataGrid.columns.length returns the total number of columns and
dataGrid.columns.getItemAt(index) returns the GridColumn at the specified index. The columns list
is mutable, which means that GridColumns can be added or removed at any time.
Column widths do not depend on the column's headerText, they're based on the rendered widths of
the DataGrid's typicalItem. If that's not specified, then the first data item is used. That's the
case here. Each column can specify an explicit width and by default all GridColumns are
resizable="true", which means that the column can be interactively resized by dragging the edges
between columns. Interactively resizing column widths changes the DataGrid's measuredWidth which
can be a little disconcerting if the DataGrid's width is not constrained. In this example we've
constrained the DataGrid's left and right edges which prevents changes in the DataGrid's
measuredWidth from affecting its actual width.
-->
<s:Application
xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark">
<s:Panel title="Spark DataGrid Control Example which demonstrates a simple DataGrid with explicitly specified columns"
width="75%" height="75%"
horizontalCenter="0" verticalCenter="0">
<s:DataGrid id="dataGrid" left="5" right="5" top="5" bottom="5">
<s:columns>
<s:ArrayList>
<s:GridColumn dataField="key" headerText="Key"/>
<s:GridColumn dataField="name" headerText="Name"/>
<s:GridColumn dataField="price" headerText="Price"/>
<s:GridColumn dataField="call" headerText="Call"/>
</s:ArrayList>
</s:columns>
<s:ArrayCollection>
<s:DataItem key="1000" name="Abrasive" price="100.11" call="false"/>
<s:DataItem key="1001" name="Brush" price="110.01" call="true"/>
<s:DataItem key="1002" name="Clamp" price="120.02" call="false"/>
<s:DataItem key="1003" name="Drill" price="130.03" call="true"/>
<s:DataItem key="1004" name="Epoxy" price="140.04" call="false"/>
<s:DataItem key="1005" name="File" price="150.05" call="true"/>
<s:DataItem key="1006" name="Gouge" price="160.06" call="false"/>
<s:DataItem key="1007" name="Hook" price="170.07" call="true"/>
<s:DataItem key="1008" name="Ink" price="180.08" call="false"/>
<s:DataItem key="1009" name="Jack" price="190.09" call="true"/>
</s:ArrayCollection>
</s:DataGrid>
</s:Panel>
</s:Application>
<?xml version="1.0" encoding="utf-8"?>
<!--
Demonstrate the GridColumn visible property and the support for dynamically adding and removing columns.
After selecting a column it's visibility can be changed, a copy of the column can be inserted, and the column can be removed.
The DataGrid columns property is a mutable list - an IList, like ArrayList - and columns can be added or removed at any time. The difference
between an IList and an intrinsic collection type like Array or Vector is that ILists dispatch events when they're changed. That's why the
DropDownList, whose dataProvider is the list of columns, tracks the changes made with the Add/Remove buttons.
Changing a column's visibility does not change its presence or position in the columns IList but it prevents the DataGrid from displaying it.
-->
<s:Application
xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark">
<fx:Script>
<![CDATA[
// Insert a column to the left of specified column
private function addNewColumn(column:GridColumn):void
{
const newColumn:GridColumn = new GridColumn();
newColumn.dataField = column.dataField;
newColumn.headerText = column.headerText + "+";
dataGrid.columns.addItemAt(newColumn, column.columnIndex);
}
// Remove the specified column
private function removeColumn(column:GridColumn):void
{
dataGrid.columns.removeItemAt(column.columnIndex);
}
]]>
</fx:Script>
<s:Panel title="Spark DataGrid Control Example which demonstrates the GridColumn visible property and dynamically adding and removing columns"
width="75%" height="75%"
horizontalCenter="0" verticalCenter="0">
<s:controlBarContent>
<s:HGroup verticalAlign="baseline">
<s:DropDownList id="ddl" prompt="Select" dataProvider="{dataGrid.columns}" labelField="headerText"/>
<s:Label text="Visible:"/>
<s:CheckBox selected="@{ddl.selectedItem.visible}" enabled="{ddl.selectedItem}"/>
<s:Button label="Add" click="addNewColumn(ddl.selectedItem)" enabled="{ddl.selectedItem}"/>
<s:Button label="Remove" click="removeColumn(ddl.selectedItem)" enabled="{ddl.selectedItem}"/>
</s:HGroup>
</s:controlBarContent>
<s:DataGrid id="dataGrid" left="5" right="5" top="5" bottom="5">
<s:columns>
<s:ArrayList>
<s:GridColumn dataField="key" headerText="Key"/>
<s:GridColumn dataField="name" headerText="Name"/>
<s:GridColumn dataField="price" headerText="Price"/>
<s:GridColumn dataField="call" headerText="Call"/>
</s:ArrayList>
</s:columns>
<s:ArrayCollection>
<s:DataItem key="1000" name="Abrasive" price="100.11" call="false"/>
<s:DataItem key="1001" name="Brush" price="110.01" call="true"/>
<s:DataItem key="1002" name="Clamp" price="120.02" call="false"/>
<s:DataItem key="1003" name="Drill" price="130.03" call="true"/>
<s:DataItem key="1004" name="Epoxy" price="140.04" call="false"/>
<s:DataItem key="1005" name="File" price="150.05" call="true"/>
<s:DataItem key="1006" name="Gouge" price="160.06" call="false"/>
<s:DataItem key="1007" name="Hook" price="170.07" call="true"/>
<s:DataItem key="1008" name="Ink" price="180.08" call="false"/>
<s:DataItem key="1009" name="Jack" price="190.09" call="true"/>
</s:ArrayCollection>
</s:DataGrid>
</s:Panel>
</s:Application>
Thu Dec 6 2018, 01:12 PM -08:00