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Keyword

Class TPager

TComponent
   |
   --TApplicationComponent
      |
      --TControl
         |
         --TWebControl
            |
            --TPager

Direct Known Sub-classes:

TPager class.

TPager creates a pager that provides UI for end-users to interactively specify which page of data to be rendered in a TDataBoundControl-derived control, such as TDataList, TRepeater, TCheckBoxList, etc. The target data-bound control is specified by ControlToPaginate, which must be the ID path of the target control reaching from the pager's naming container. Note, the target control must have its TDataBoundControl::setAllowPaging set to true.

TPager can display three different UIs, specified via Mode:

  • NextPrev: a next page and a previous page button are rendered.
  • Numeric: a list of page index buttons are rendered.
  • List: a dropdown list of page indices are rendered.
When the pager mode is either NextPrev or Numeric, the paging buttons may be displayed in three types by setting ButtonType:
  • LinkButton: a hyperlink button
  • PushButton: a normal button
  • ImageButton: an image button (please set XXXPageImageUrl properties accordingly to specify the button images.)
TPager raises an OnPageIndexChanged event when the end-user interacts with it and specifies a new page (e.g. clicking on a page button that leads to a new page.) The new page index may be obtained from the event parameter's property TPagerPageChangedEventParameter::getNewPageIndex. Normally, in the event handler, one can set the TDataBoundControl::getCurrentPageIndex to this new page index so that the new page of data is rendered.

Multiple pagers can be associated with the same data-bound control.

Since: 3.0.2
Author: Qiang Xue <qiang.xue@gmail.com>
Constants Inherited From TControl
AUTOMATIC_ID_PREFIX, CLIENT_ID_SEPARATOR, CS_CHILD_INITIALIZED, CS_CONSTRUCTED, CS_INITIALIZED, CS_LOADED, CS_PRERENDERED, CS_STATE_LOADED, ID_FORMAT, ID_SEPARATOR, IS_CHILD_CREATED, IS_CREATING_CHILD, IS_DISABLE_THEMING, IS_DISABLE_VIEWSTATE, IS_ID_SET, IS_SKIN_APPLIED, IS_STYLESHEET_APPLIED, RF_ADAPTER, RF_AUTO_BINDINGS, RF_CHILD_STATE, RF_CONTROLS, RF_CONTROLSTATE, RF_DATA_BINDINGS, RF_EVENTS, RF_NAMED_CONTROLS, RF_NAMED_CONTROLS_ID, RF_NAMED_OBJECTS, RF_SKIN_ID,
Method Summary
boolean
bubbleEvent ( TControl $sender, TEventParameter $param)
Processes a bubbled event.
protected  void
buildListPager ()
Builds a dropdown list pager
protected  void
buildNextPrevPager ()
Builds a next-prev pager
protected  void
buildNumericPager ()
Builds a numeric pager
protected  void
buildPager ()
Builds the pager content based on the pager mode.
protected  mixed
createPagerButton ( string $buttonType, boolean $enabled, string $text, string $commandName, string $commandParameter)
Creates a pager button.
TPagerButtonType
getButtonType ()
string
getControlToPaginate ()
integer
getCurrentPageIndex ()
string
getFirstPageImageUrl ()
string
getFirstPageText ()
boolean
getIsFirstPage ()
boolean
getIsLastPage ()
string
getLastPageImageUrl ()
string
getLastPageText ()
TPagerMode
getMode ()
string
getNextPageImageUrl ()
string
getNextPageText ()
string
getNumericPageImageUrl ()
integer
getPageButtonCount ()
integer
getPageCount ()
protected  void
getPageImageUrl ( string $text, string $commandName)
string
getPrevPageImageUrl ()
string
getPrevPageText ()
void
listIndexChanged ( TDropDownList $sender, TEventParameter $param)
Event handler to the OnSelectedIndexChanged event of the dropdown list.
void
loadState ()
Restores the pager state.
void
onPageIndexChanged ( TPagerPageChangedEventParameter $param)
This event is raised when page index is changed due to a page button click.
void
onPreRender ( Traversable $param)
Performs databinding to populate data items from data source.
void
render ( THtmlWriter $writer)
Renders the control.
void
setButtonType ( TPagerButtonType $value)
void
setControlToPaginate ( string $value)
Sets the ID path of the control whose content would be paginated.
protected  void
setCurrentPageIndex ( integer $value)
void
setFirstPageImageUrl ( string $value)
void
setFirstPageText ( string $value)
void
setLastPageImageUrl ( string $value)
void
setLastPageText ( string $value)
void
setMode ( TPagerMode $value)
void
setNextPageImageUrl ( string $value)
void
setNextPageText ( string $value)
void
setNumericPageImageUrl ( string $value)
Sets the image URL for the numeric page buttons.
void
setPageButtonCount ( integer $value)
protected  void
setPageCount ( integer $value)
void
setPrevPageImageUrl ( string $value)
void
setPrevPageText ( string $value)
Methods Inherited From TWebControl
TWebControl::addAttributesToRender(), TWebControl::clearStyle(), TWebControl::copyBaseAttributes(), TWebControl::createStyle(), TWebControl::getAccessKey(), TWebControl::getBackColor(), TWebControl::getBorderColor(), TWebControl::getBorderStyle(), TWebControl::getBorderWidth(), TWebControl::getCssClass(), TWebControl::getDisplay(), TWebControl::getFont(), TWebControl::getForeColor(), TWebControl::getHasStyle(), TWebControl::getHeight(), TWebControl::getStyle(), TWebControl::getTabIndex(), TWebControl::getTagName(), TWebControl::getToolTip(), TWebControl::getWidth(), TWebControl::render(), TWebControl::renderBeginTag(), TWebControl::renderContents(), TWebControl::renderEndTag(), TWebControl::setAccessKey(), TWebControl::setBackColor(), TWebControl::setBorderColor(), TWebControl::setBorderStyle(), TWebControl::setBorderWidth(), TWebControl::setCssClass(), TWebControl::setDisplay(), TWebControl::setForeColor(), TWebControl::setHeight(), TWebControl::setStyle(), TWebControl::setTabIndex(), TWebControl::setToolTip(), TWebControl::setWidth()
Methods Inherited From TControl
TControl::addedControl(), TControl::addParsedObject(), TControl::addToPostDataLoader(), TControl::applyStyleSheetSkin(), TControl::autoBindProperty(), TControl::autoDataBindProperties(), TControl::bindProperty(), TControl::broadcastEvent(), TControl::bubbleEvent(), TControl::clearChildState(), TControl::clearControlState(), TControl::clearNamingContainer(), TControl::clearViewState(), TControl::convertUniqueIdToClientId(), TControl::createChildControls(), TControl::createControlCollection(), TControl::dataBind(), TControl::dataBindChildren(), TControl::dataBindProperties(), TControl::ensureChildControls(), TControl::findControl(), TControl::findControlsByID(), TControl::findControlsByType(), TControl::focus(), TControl::getAdapter(), TControl::getAllowChildControls(), TControl::getAttribute(), TControl::getAttributes(), TControl::getChildControlsCreated(), TControl::getClientID(), TControl::getControls(), TControl::getControlStage(), TControl::getControlState(), TControl::getCustomData(), TControl::getEnabled(), TControl::getEnableTheming(), TControl::getEnableViewState(), TControl::getHasAdapter(), TControl::getHasAttributes(), TControl::getHasChildInitialized(), TControl::getHasControls(), TControl::getHasInitialized(), TControl::getHasLoaded(), TControl::getHasLoadedPostData(), TControl::getHasPreRendered(), TControl::getID(), TControl::getNamingContainer(), TControl::getPage(), TControl::getParent(), TControl::getRegisteredObject(), TControl::getSkinID(), TControl::getSourceTemplateControl(), TControl::getTemplateControl(), TControl::getUniqueID(), TControl::getViewState(), TControl::getVisible(), TControl::hasAttribute(), TControl::initRecursive(), TControl::isDescendentOf(), TControl::isObjectRegistered(), TControl::loadRecursive(), TControl::loadState(), TControl::loadStateRecursive(), TControl::onDataBinding(), TControl::onInit(), TControl::onLoad(), TControl::onPreRender(), TControl::onUnload(), TControl::preRenderRecursive(), TControl::raiseBubbleEvent(), TControl::registerObject(), TControl::removeAttribute(), TControl::removedControl(), TControl::render(), TControl::renderChildren(), TControl::renderControl(), TControl::saveState(), TControl::saveStateRecursive(), TControl::setAdapter(), TControl::setAttribute(), TControl::setChildControlsCreated(), TControl::setControlStage(), TControl::setControlState(), TControl::setCustomData(), TControl::setEnabled(), TControl::setEnableTheming(), TControl::setEnableViewState(), TControl::setID(), TControl::setPage(), TControl::setSkinID(), TControl::setTemplateControl(), TControl::setViewState(), TControl::setVisible(), TControl::trackViewState(), TControl::traverseChildControls(), TControl::unbindProperty(), TControl::unloadRecursive(), TControl::unregisterObject(), TControl::__get()
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()
Constant Summary
string CMD_PAGE Command name that TPager understands.
string CMD_PAGE_FIRST
string CMD_PAGE_LAST
string CMD_PAGE_NEXT
string CMD_PAGE_PREV
Method Details

bubbleEvent

public boolean bubbleEvent (TControl $sender , TEventParameter $param )

Processes a bubbled event.

This method overrides parent's implementation by wrapping event parameter for OnCommand event with item information.

Input
TControl$senderthe sender of the event
TEventParameter$paramevent parameter
Output
boolean whether the event bubbling should stop here.
Exception

buildListPager

protected void buildListPager ()

Builds a dropdown list pager

Output
Exception

buildNextPrevPager

protected void buildNextPrevPager ()

Builds a next-prev pager

Output
Exception

buildNumericPager

protected void buildNumericPager ()

Builds a numeric pager

Output
Exception

buildPager

protected void buildPager ()

Builds the pager content based on the pager mode.

Current implementation includes building 'NextPrev', 'Numeric' and 'DropDownList' pagers. Derived classes may override this method to provide additional pagers.

Output
Exception

createPagerButton

protected mixed createPagerButton (string $buttonType , boolean $enabled , string $text , string $commandName , string $commandParameter )

Creates a pager button.

Depending on the button type, a TLinkButton or a TButton may be created. If it is enabled (clickable), its command name and parameter will also be set. Derived classes may override this method to create additional types of buttons, such as TImageButton.

Input
string$buttonTypebutton type, either LinkButton or PushButton
boolean$enabledwhether the button should be enabled
string$textcaption of the button.
string$commandNameCommandName corresponding to the OnCommand event of the button.
string$commandParameterCommandParameter corresponding to the OnCommand event of the button
Output
mixed the button instance
Exception

getButtonType

public TPagerButtonType getButtonType ()

Output
TPagerButtonType the type of command button for paging. Defaults to TPagerButtonType::LinkButton.
Exception

getControlToPaginate

public string getControlToPaginate ()

Output
string the ID path of the control whose content would be paginated.
Exception

getCurrentPageIndex

public integer getCurrentPageIndex ()

Output
integer the zero-based index of the current page. Defaults to 0.
Exception

getFirstPageImageUrl

public string getFirstPageImageUrl ()

Output
string the image URL for the first page button. This is only used when ButtonType is 'ImageButton'.
Exception

getFirstPageText

public string getFirstPageText ()

Output
string text for the first page button. Defaults to ''.
Exception

getIsFirstPage

public boolean getIsFirstPage ()

Output
boolean whether the current page is the first page Defaults to false.
Exception

getIsLastPage

public boolean getIsLastPage ()

Output
boolean whether the current page is the last page
Exception

getLastPageImageUrl

public string getLastPageImageUrl ()

Output
string the image URL for the last page button. This is only used when ButtonType is 'ImageButton'.
Exception

getLastPageText

public string getLastPageText ()

Output
string text for the last page button. Defaults to '>>'.
Exception

getMode

public TPagerMode getMode ()

Output
TPagerMode pager mode. Defaults to TPagerMode::NextPrev.
Exception

getNextPageImageUrl

public string getNextPageImageUrl ()

Output
string the image URL for the next page button. This is only used when ButtonType is 'ImageButton'.
Exception

getNextPageText

public string getNextPageText ()

Output
string text for the next page button. Defaults to '>'.
Exception

getNumericPageImageUrl

public string getNumericPageImageUrl ()

Output
string the image URL for the numeric page buttons. This is only used when ButtonType is 'ImageButton' and Mode is 'Numeric'.
Exception

getPageButtonCount

public integer getPageButtonCount ()

Output
integer maximum number of pager buttons to be displayed. Defaults to 10.
Exception

getPageCount

public integer getPageCount ()

Output
integer number of pages of data items available
Exception

getPageImageUrl

protected void getPageImageUrl (string $text , string $commandName )

Input
string$textthe caption of the image button
string$commandNamethe command name associated with the image button
Output
Exception

getPrevPageImageUrl

public string getPrevPageImageUrl ()

Output
string the image URL for the previous page button. This is only used when ButtonType is 'ImageButton'.
Exception

getPrevPageText

public string getPrevPageText ()

Output
string text for the previous page button. Defaults to '<'.
Exception

listIndexChanged

public void listIndexChanged (TDropDownList $sender , TEventParameter $param )

Event handler to the OnSelectedIndexChanged event of the dropdown list.

This handler will raise OnPageIndexChanged event.

Input
TDropDownList$senderthe dropdown list control raising the event
TEventParameter$paramevent parameter
Output
Exception

loadState

public void loadState ()

Restores the pager state.

This method overrides the parent implementation and is invoked when the control is loading persistent state.

Output
Exception

onPageIndexChanged

public void onPageIndexChanged (TPagerPageChangedEventParameter $param )

This event is raised when page index is changed due to a page button click.

Input
TPagerPageChangedEventParameter$paramevent parameter
Output
Exception

onPreRender

public void onPreRender (Traversable $param )

Performs databinding to populate data items from data source.

This method is invoked by dataBind(). You may override this function to provide your own way of data population.

Input
Traversable$paramthe bound data
Output
Exception

render

public void render (THtmlWriter $writer )

Renders the control.

The method overrides the parent implementation by rendering the pager only when there are two or more pages.

Input
THtmlWriter$writerthe writer
Output
Exception

setButtonType

public void setButtonType (TPagerButtonType $value )

Input
TPagerButtonType$valuethe type of command button for paging.
Output
Exception

setControlToPaginate

public void setControlToPaginate (string $value )

Sets the ID path of the control whose content would be paginated.

The ID path is the dot-connected IDs of the controls reaching from the pager's naming container to the target control.

Input
string$valuethe ID path
Output
Exception

setCurrentPageIndex

protected void setCurrentPageIndex (integer $value )

Input
integer$valuethe zero-based index of the current page
Output
Exception
throwsTInvalidDataValueException if the value is less than 0

setFirstPageImageUrl

public void setFirstPageImageUrl (string $value )

Input
string$valuethe image URL for the first page button. This is only used when ButtonType is 'ImageButton'.
Output
Exception

setFirstPageText

public void setFirstPageText (string $value )

Input
string$valuetext for the first page button. If empty, the first page button will not be rendered.
Output
Exception

setLastPageImageUrl

public void setLastPageImageUrl (string $value )

Input
string$valuethe image URL for the last page button. This is only used when ButtonType is 'ImageButton'.
Output
Exception

setLastPageText

public void setLastPageText (string $value )

Input
string$valuetext for the last page button. If empty, the last page button will not be rendered.
Output
Exception

setMode

public void setMode (TPagerMode $value )

Input
TPagerMode$valuepager mode.
Output
Exception

setNextPageImageUrl

public void setNextPageImageUrl (string $value )

Input
string$valuethe image URL for the next page button. This is only used when ButtonType is 'ImageButton'.
Output
Exception

setNextPageText

public void setNextPageText (string $value )

Input
string$valuetext for the next page button.
Output
Exception

setNumericPageImageUrl

public void setNumericPageImageUrl (string $value )

Sets the image URL for the numeric page buttons.

This is actually a template for generating a set of URLs corresponding to numeric button 1, 2, 3, .., etc. Use {0} as the placeholder for the numbers. For example, the image URL http://example.com/images/button{0}.gif will be replaced as http://example.com/images/button1.gif, http://example.com/images/button2.gif, etc.

Input
string$valuethe image URL for the numeric page buttons. This is only used when ButtonType is 'ImageButton' and Mode is 'Numeric'.
Output
Exception

setPageButtonCount

public void setPageButtonCount (integer $value )

Input
integer$valuemaximum number of pager buttons to be displayed
Output
Exception
throwsTInvalidDataValueException if the value is less than 1.

setPageCount

protected void setPageCount (integer $value )

Input
integer$valuenumber of pages of data items available
Output
Exception
throwsTInvalidDataValueException if the value is less than 0

setPrevPageImageUrl

public void setPrevPageImageUrl (string $value )

Input
string$valuethe image URL for the previous page button. This is only used when ButtonType is 'ImageButton'.
Output
Exception

setPrevPageText

public void setPrevPageText (string $value )

Input
string$valuetext for the next page button.
Output
Exception
Constant Details

CMD_PAGE

Command name that TPager understands.

Type:

string

Value:

'Page'

CMD_PAGE_FIRST

Type:

string

Value:

'First'

CMD_PAGE_LAST

Type:

string

Value:

'Last'

CMD_PAGE_NEXT

Type:

string

Value:

'Next'

CMD_PAGE_PREV

Type:

string

Value:

'Previous'