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CCaptcha

Package	system.web.widgets.captcha
Inheritance	class CCaptcha » CWidget » CBaseController » CComponent
Since	1.0
Version	$Id: CCaptcha.php 2185 2010-06-14 21:21:11Z qiang.xue $

CCaptcha renders a CAPTCHA image element.

CCaptcha is used together with CCaptchaAction to provide CAPTCHA - a way of preventing site spam.

The image element rendered by CCaptcha will display a CAPTCHA image generated by an action of class CCaptchaAction belonging to the current controller. By default, the action ID should be 'captcha', which can be changed by setting captchaAction.

CCaptcha may also render a button next to the CAPTCHA image. Clicking on the button will change the CAPTCHA image to be a new one in an AJAX way.

Since version 1.0.8, if clickableImage is set true, clicking on the CAPTCHA image will refresh the CAPTCHA.

A CCaptchaValidator may be used to validate that the user enters a verification code matching the code displayed in the CAPTCHA image.

Public Properties

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Property	Type	Description	Defined By
actionPrefix	string	the prefix to the IDs of the actions.	CWidget
buttonLabel	string	the label for the refresh button.	CCaptcha
buttonOptions	array	HTML attributes to be applied to the rendered refresh button element.	CCaptcha
buttonType	string	the type of the refresh button.	CCaptcha
captchaAction	string	the ID of the action that should provide CAPTCHA image.	CCaptcha
clickableImage	boolean	whether to allow clicking on the CAPTCHA image to refresh the CAPTCHA letters.	CCaptcha
controller	CController	the controller that this widget belongs to.	CWidget
id	string	id of the widget.	CWidget
imageOptions	array	HTML attributes to be applied to the rendered image element.	CCaptcha
owner	CBaseController	owner/creator of this widget.	CWidget
showRefreshButton	boolean	whether to display a button next to the CAPTCHA image.	CCaptcha
skin	mixed	the name of the skin to be used by this widget.	CWidget
viewPath	string	Returns the directory containing the view files for this widget.	CWidget

Public Methods

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Method	Description	Defined By
__call()	Calls the named method which is not a class method.	CComponent
__construct()	Constructor.	CWidget
__get()	Returns a property value, an event handler list or a behavior based on its name.	CComponent
__isset()	Checks if a property value is null.	CComponent
__set()	Sets value of a component property.	CComponent
__unset()	Sets a component property to be null.	CComponent
actions()	Returns a list of actions that are used by this widget.	CWidget
asa()	Returns the named behavior object.	CComponent
attachBehavior()	Attaches a behavior to this component.	CComponent
attachBehaviors()	Attaches a list of behaviors to the component.	CComponent
attachEventHandler()	Attaches an event handler to an event.	CComponent
beginCache()	Begins fragment caching.	CBaseController
beginClip()	Begins recording a clip.	CBaseController
beginContent()	Begins the rendering of content that is to be decorated by the specified view.	CBaseController
beginWidget()	Creates a widget and executes it.	CBaseController
canGetProperty()	Determines whether a property can be read.	CComponent
canSetProperty()	Determines whether a property can be set.	CComponent
createWidget()	Creates a widget and initializes it.	CBaseController
detachBehavior()	Detaches a behavior from the component.	CComponent
detachBehaviors()	Detaches all behaviors from the component.	CComponent
detachEventHandler()	Detaches an existing event handler.	CComponent
disableBehavior()	Disables an attached behavior.	CComponent
disableBehaviors()	Disables all behaviors attached to this component.	CComponent
enableBehavior()	Enables an attached behavior.	CComponent
enableBehaviors()	Enables all behaviors attached to this component.	CComponent
endCache()	Ends fragment caching.	CBaseController
endClip()	Ends recording a clip.	CBaseController
endContent()	Ends the rendering of content.	CBaseController
endWidget()	Ends the execution of the named widget.	CBaseController
evaluateExpression()	Evaluates a PHP expression or callback under the context of this component.	CComponent
getController()		CWidget
getEventHandlers()	Returns the list of attached event handlers for an event.	CComponent
getId()		CWidget
getOwner()		CWidget
getViewFile()	Looks for the view script file according to the view name.	CWidget
getViewPath()	Returns the directory containing the view files for this widget.	CWidget
hasEvent()	Determines whether an event is defined.	CComponent
hasEventHandler()	Checks whether the named event has attached handlers.	CComponent
hasProperty()	Determines whether a property is defined.	CComponent
init()	Initializes the widget.	CWidget
raiseEvent()	Raises an event.	CComponent
registerClientScript()	Registers the needed client scripts.	CCaptcha
render()	Renders a view.	CWidget
renderFile()	Renders a view file.	CBaseController
renderInternal()	Renders a view file.	CBaseController
run()	Renders the widget.	CCaptcha
setId()		CWidget
widget()	Creates a widget and executes it.	CBaseController

Protected Methods

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Method	Description	Defined By
renderImage()	Renders the CAPTCHA image.	CCaptcha

Property Details

buttonLabel property

public string $buttonLabel;

the label for the refresh button. Defaults to 'Get a new code'.

buttonOptions property

public array $buttonOptions;

HTML attributes to be applied to the rendered refresh button element.

buttonType property

public string $buttonType;

the type of the refresh button. This should be either 'link' or 'button'. The former refers to hyperlink button while the latter a normal push button. Defaults to 'link'.

captchaAction property

public string $captchaAction;

the ID of the action that should provide CAPTCHA image. Defaults to 'captcha', meaning the 'captcha' action of the current controller. This property may also be in the format of 'ControllerID/ActionID'. Underneath, this property is used by CController::createUrl to create the URL that would serve the CAPTCHA image. The action has to be of CCaptchaAction.

clickableImage property (available since v1.0.8)

public boolean $clickableImage;

whether to allow clicking on the CAPTCHA image to refresh the CAPTCHA letters. Defaults to false. Hint: you may want to set showRefreshButton to false if you set this property to be true because they serve for the same purpose. To enhance accessibility, you may set imageOptions to provide hints to end-users that the image is clickable.

imageOptions property

public array $imageOptions;

HTML attributes to be applied to the rendered image element.

showRefreshButton property

public boolean $showRefreshButton;

whether to display a button next to the CAPTCHA image. Clicking on the button will cause the CAPTCHA image to be changed to a new one. Defaults to true.

Method Details

registerClientScript() method (available since v1.0.2)

public void registerClientScript()

Registers the needed client scripts.

renderImage() method

protected void renderImage()

Renders the CAPTCHA image.

run() method

public void run()

Renders the widget.