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Classes:
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Keyword

Class TDropDownListColumn

TComponent
   |
   --TApplicationComponent
      |
      --TDataGridColumn
         |
         --TDropDownListColumn

TDropDownListColumn class

TDropDownListColumn represents a column that is bound to a field in a data source. The cells in the column will be displayed using the data indexed by DataTextField. You can customize the display by setting DataTextFormatString.

If ReadOnly is false, TDropDownListColumn will display cells in edit mode with dropdown lists. Otherwise, a static text is displayed. The currently selected dropndown list item is specified by the data indexed with DataValueField.

There are two approaches to specify the list items available for selection. The first approach uses template syntax as follows,

  1. <com:TDropDownListColumn ....>
  2. <com:TListItem Value="1" Text="first item" />
  3. <com:TListItem Value="2" Text="second item" />
  4. <com:TListItem Value="3" Text="third item" />
  5. </com:TDropDownListColumn>
The second approach specifies a data source to be bound to the dropdown lists by setting ListDataSource. Like generic list controls, you may also want to specify which data fields are used for item values and texts by setting ListValueField and ListTextField, respectively. Furthermore, the item texts may be formatted by using ListTextFormatString. Note, if you specify ListDataSource, do it before calling the datagrid's dataBind().

The dropdown list control in the TDropDownListColumn can be accessed by one of the following two methods:

  1. $datagridItem->DropDownListColumnID->DropDownList
  2. $datagridItem->DropDownListColumnID->Controls[0]
The second method is possible because the dropdown list control created within the datagrid cell is the first child.

Since: 3.0.4
Author: Qiang Xue <qiang.xue@gmail.com>

Constructor Summary
public

Method Summary
void
addParsedObject ( mixed $object)
Adds object parsed from template to the control.
void
dataBindColumn ( mixed $sender, mixed $param)
Databinds a cell in the column.
string
string
string
Traversable
string
string
string
boolean
void
initializeCell ( TTableCell $cell, integer $columnIndex, string $itemType)
Initializes the specified cell to its initial values.
void
loadState ( mixed $state)
Loads items from viewstate.
void
Saves items into viewstate.
void
setDataTextField ( string $value)
Sets the field of the data source that provides the text content of the column.
void
setDataTextFormatString ( string $value)
void
setDataValueField ( string $value)
Sets the field of the data source that provides the key selecting an item in dropdown list.
void
setListDataSource ( Traversable|array|string $value)
void
setListTextField ( string $value)
void
setListTextFormatString ( string $value)
void
setListValueField ( string $value)
void
setReadOnly ( boolean $value)
Methods Inherited From TDataGridColumn
TDataGridColumn::formatDataValue(), TDataGridColumn::getAllowSorting(), TDataGridColumn::getDataFieldValue(), TDataGridColumn::getEnableCellGrouping(), TDataGridColumn::getFooterRenderer(), TDataGridColumn::getFooterStyle(), TDataGridColumn::getFooterText(), TDataGridColumn::getHeaderImageUrl(), TDataGridColumn::getHeaderRenderer(), TDataGridColumn::getHeaderStyle(), TDataGridColumn::getHeaderText(), TDataGridColumn::getID(), TDataGridColumn::getItemStyle(), TDataGridColumn::getOwner(), TDataGridColumn::getSortExpression(), TDataGridColumn::getViewState(), TDataGridColumn::getVisible(), TDataGridColumn::initialize(), TDataGridColumn::initializeCell(), TDataGridColumn::initializeFooterCell(), TDataGridColumn::initializeHeaderCell(), TDataGridColumn::loadState(), TDataGridColumn::saveState(), TDataGridColumn::setEnableCellGrouping(), TDataGridColumn::setFooterRenderer(), TDataGridColumn::setFooterText(), TDataGridColumn::setHeaderImageUrl(), TDataGridColumn::setHeaderRenderer(), TDataGridColumn::setHeaderText(), TDataGridColumn::setID(), TDataGridColumn::setOwner(), TDataGridColumn::setSortExpression(), TDataGridColumn::setViewState(), TDataGridColumn::setVisible()
Methods Inherited From TApplicationComponent
TApplicationComponent::getApplication(), TApplicationComponent::getRequest(), TApplicationComponent::getResponse(), TApplicationComponent::getService(), TApplicationComponent::getSession(), TApplicationComponent::getUser(), TApplicationComponent::publishAsset(), TApplicationComponent::publishFilePath()
Methods Inherited From TComponent
TComponent::addParsedObject(), TComponent::attachEventHandler(), TComponent::canGetProperty(), TComponent::canSetProperty(), TComponent::createdOnTemplate(), TComponent::detachEventHandler(), TComponent::evaluateExpression(), TComponent::evaluateStatements(), TComponent::getEventHandlers(), TComponent::getSubProperty(), TComponent::hasEvent(), TComponent::hasEventHandler(), TComponent::hasProperty(), TComponent::raiseEvent(), TComponent::setSubProperty(), TComponent::__get(), TComponent::__set()

Constructor Details

__construct

public __construct


Method Details

addParsedObject

public void addParsedObject (mixed $object )

Adds object parsed from template to the control.

This method adds only TListItem objects into the getItems collection. All other objects are ignored.

Input
mixed$objectobject parsed from template
Output
Exception

dataBindColumn

public void dataBindColumn (mixed $sender , mixed $param )

Databinds a cell in the column.

This method is invoked when datagrid performs databinding. It populates the content of the cell with the relevant data from data source.

Input
mixed$sender
mixed$param
Output
Exception

getDataTextField

public string getDataTextField ()

Output
string the field of the data source that provides the text content of the column.
Exception

getDataTextFormatString

public string getDataTextFormatString ()

Output
string the formatting string used to control how the bound data will be displayed.
Exception

getDataValueField

public string getDataValueField ()

Output
string the field of the data source that provides the key selecting an item in dropdown list.
Exception

getListDataSource

public Traversable getListDataSource ()

Output
Traversable data source to be bound to the dropdown list boxes.
Exception

getListTextField

public string getListTextField ()

Output
string the data field used to populate the texts of the dropdown list items. Defaults to empty.
Exception

getListTextFormatString

public string getListTextFormatString ()

Output
string the formatting string used to control how the list item texts will be displayed.
Exception

getListValueField

public string getListValueField ()

Output
string the data field used to populate the values of the dropdown list items. Defaults to empty.
Exception

getReadOnly

public boolean getReadOnly ()

Output
boolean whether the items in the column can be edited. Defaults to false.
Exception

initializeCell

public void initializeCell (TTableCell $cell , integer $columnIndex , string $itemType )

Initializes the specified cell to its initial values.

This method overrides the parent implementation. It creates a textbox for item in edit mode and the column is not read-only. Otherwise it displays a static text. The caption of the button and the static text are retrieved from the datasource.

Input
TTableCell$cellthe cell to be initialized.
integer$columnIndexthe index to the Columns property that the cell resides in.
string$itemTypethe type of cell (Header,Footer,Item,AlternatingItem,EditItem,SelectedItem)
Output
Exception

loadState

public void loadState (mixed $state )

Loads items from viewstate.

This method overrides the parent implementation by loading list items

Input
mixed$statestate values
Output
Exception

saveState

public void saveState ()

Saves items into viewstate.

This method overrides the parent implementation by saving list items

Output
Exception

setDataTextField

public void setDataTextField (string $value )

Sets the field of the data source that provides the text content of the column.

If this is not set, the data specified via DataValueField will be displayed in the column.

Input
string$valuethe field of the data source that provides the text content of the column.
Output
Exception

setDataTextFormatString

public void setDataTextFormatString (string $value )

Input
string$valuethe formatting string used to control how the bound data will be displayed.
Output
Exception

setDataValueField

public void setDataValueField (string $value )

Sets the field of the data source that provides the key selecting an item in dropdown list.

If this is not present, the data specified via DataTextField (without applying the formatting string) will be used for selection, instead.

Input
string$valuethe field of the data source that provides the key selecting an item in dropdown list.
Output
Exception

setListDataSource

public void setListDataSource (Traversable|array|string $value )

Input
Traversable|array|string$valuedata source to be bound to the dropdown list boxes.
Output
Exception

setListTextField

public void setListTextField (string $value )

Input
string$valuethe data field used to populate the texts of the dropdown list items
Output
Exception

setListTextFormatString

public void setListTextFormatString (string $value )

Input
string$valuethe formatting string used to control how the list item texts will be displayed.
Output
Exception

setListValueField

public void setListValueField (string $value )

Input
string$valuethe data field used to populate the values of the dropdown list items
Output
Exception

setReadOnly

public void setReadOnly (boolean $value )

Input
boolean$valuewhether the items in the column can be edited
Output
Exception