PHP Class Prado\Web\UI\WebControls\TImageButton

TImageButton creates an image button on the page. It is used to submit data to a page. You can create either a submit button or a command button. A command button has a command name (specified by the {@link setCommandName CommandName} property) and and a command parameter (specified by {@link setCommandParameter CommandParameter} property) associated with the button. This allows you to create multiple TLinkButton components on a Web page and programmatically determine which one is clicked with what parameter. You can provide an event handler for {@link onCommand OnCommand} event to programmatically control the actions performed when the command button is clicked. In the event handler, you can determine the {@link setCommandName CommandName} property value and the {@link setCommandParameter CommandParameter} property value through the {@link TCommandParameter::getName Name} and {@link TCommandParameter::getParameter Parameter} properties of the event parameter which is of type {@link \Prado\Web\UI\TCommandEventParameter}. A submit button does not have a command name associated with the button and clicking on it simply posts the Web page back to the server. By default, a TImageButton control is a submit button. You can provide an event handler for the {@link onClick OnClick} event to programmatically control the actions performed when the submit button is clicked. The coordinates of the clicking point can be obtained from the {@link onClick OnClick} event parameter, which is of type {@link TImageClickEventParameter}. Clicking on button can trigger form validation, if {@link setCausesValidation CausesValidation} is true. And the validation may be restricted within a certain group of validator controls by setting {@link setValidationGroup ValidationGroup} property. If validation is successful, the data will be post back to the same page. TImageButton displays the {@link setText Text} property as the hint text to the displayed image.
Since: 3.0
Author: Qiang Xue ([email protected])
Inheritance: extends TImage, implements Prado\Web\UI\IPostBackDataHandler, implements Prado\Web\UI\IPostBackEventHandler, implements Prado\Web\UI\IButtonControl
Datei anzeigen Open project: pradosoft/prado Class Usage Examples

Public Methods

Method Description
getCausesValidation ( ) : boolean
getCommandName ( ) : string
getCommandParameter ( ) : string
getDataChanged ( ) : boolean Returns a value indicating whether postback has caused the control data change.
getEnableClientScript ( ) : boolean
getIsDefaultButton ( ) : boolean
getText ( ) : string
getValidationGroup ( ) : string
loadPostData ( $key, $values ) : boolean This method checks if the TImageButton is clicked and loads the coordinates of the clicking position.
onClick ( $param ) This method is invoked when the button is clicked.
onCommand ( $param ) This method is invoked when the button is clicked.
onPreRender ( $param ) Registers the image button to receive postback data during postback.
raisePostBackEvent ( $param ) Raises the postback event.
raisePostDataChangedEvent ( ) A dummy implementation for the \Prado\Web\UI\IPostBackDataHandler interface.
renderContents ( $writer ) Renders the body content enclosed between the control tag.
setCausesValidation ( $value )
setCommandName ( $value )
setCommandParameter ( $value )
setEnableClientScript ( $value )
setIsDefaultButton ( $value )
setText ( $value )
setValidationGroup ( $value )

Protected Methods

Method Description
addAttributesToRender ( $writer ) Adds attribute name-value pairs to renderer.
canCauseValidation ( ) : boolean
getClientClassName ( ) : string Gets the name of the javascript class responsible for performing postback for this control.
getPostBackOptions ( ) : array Returns postback specifications for the button.
getTagName ( ) : string
needPostBackScript ( ) : boolean
renderClientControlScript ( $writer ) Renders the client-script code.

Method Details

addAttributesToRender() protected method

This overrides the parent implementation with additional button specific attributes.
protected addAttributesToRender ( $writer )

canCauseValidation() protected method

protected canCauseValidation ( ) : boolean
return boolean whether to perform validation if the button is clicked

getCausesValidation() public method

public getCausesValidation ( ) : boolean
return boolean whether postback event trigger by this button will cause input validation, default is true

getClientClassName() protected method

This method overrides the parent implementation.
protected getClientClassName ( ) : string
return string the javascript class name

getCommandName() public method

public getCommandName ( ) : string
return string the command name associated with the {@link onCommand OnCommand} event.

getCommandParameter() public method

public getCommandParameter ( ) : string
return string the parameter associated with the {@link onCommand OnCommand} event

getDataChanged() public method

This method is required by the \Prado\Web\UI\IPostBackDataHandler interface.
public getDataChanged ( ) : boolean
return boolean whether postback has caused the control data change. False if the page is not in postback mode.

getEnableClientScript() public method

public getEnableClientScript ( ) : boolean
return boolean whether to render javascript.

getIsDefaultButton() public method

public getIsDefaultButton ( ) : boolean
return boolean true if this button is registered as a default button for a panel.

getPostBackOptions() protected method

This method is used by framework and control developers.
protected getPostBackOptions ( ) : array
return array parameters about how the button defines its postback behavior.

getTagName() protected method

protected getTagName ( ) : string
return string tag name of the button

getText() public method

public getText ( ) : string
return string caption of the button

getValidationGroup() public method

public getValidationGroup ( ) : string
return string the group of validators which the button causes validation upon postback

loadPostData() public method

This method is primarly used by framework developers.
public loadPostData ( $key, $values ) : boolean
return boolean whether the data of the component has been changed

needPostBackScript() protected method

protected needPostBackScript ( ) : boolean
return boolean whether the button needs javascript to do postback

onClick() public method

The method raises 'OnClick' event to fire up the event handlers. If you override this method, be sure to call the parent implementation so that the event handler can be invoked.
public onClick ( $param )

onCommand() public method

The method raises 'OnCommand' event to fire up the event handlers. If you override this method, be sure to call the parent implementation so that the event handlers can be invoked.
public onCommand ( $param )

onPreRender() public method

This is necessary because an image button, when postback, does not have direct mapping between post data and the image button name. This method overrides the parent implementation and is invoked before render.
public onPreRender ( $param )

raisePostBackEvent() public method

This method is required by {@link IPostBackEventHandler} interface. If {@link getCausesValidation CausesValidation} is true, it will invoke the page's {@link TPage::validate validate} method first. It will raise {@link onClick OnClick} and {@link onCommand OnCommand} events. This method is mainly used by framework and control developers.
public raisePostBackEvent ( $param )

raisePostDataChangedEvent() public method

A dummy implementation for the \Prado\Web\UI\IPostBackDataHandler interface.
public raisePostDataChangedEvent ( )

renderClientControlScript() protected method

Renders the client-script code.
protected renderClientControlScript ( $writer )

renderContents() public method

This overrides the parent implementation with nothing to be rendered.
public renderContents ( $writer )

setCausesValidation() public method

public setCausesValidation ( $value )

setCommandName() public method

public setCommandName ( $value )

setCommandParameter() public method

public setCommandParameter ( $value )

setEnableClientScript() public method

public setEnableClientScript ( $value )

setIsDefaultButton() public method

public setIsDefaultButton ( $value )

setText() public method

public setText ( $value )

setValidationGroup() public method

public setValidationGroup ( $value )