Class JsHelper

Javascript Generator helper class for easy use of JavaScript.

JsHelper provides an abstract interface for authoring JavaScript with a given client-side library.

Object

Overloadable

Helper

AppHelper

JsHelper

Package: cake\cake\libs\view\helpers
Copyright: Copyright 2005-2012, Cake Software Foundation, Inc.
License: License (http://www.opensource.org/licenses/mit-license.php)
Location: view/helpers/js.php

Properties summary

$__bufferedScripts public

array

Scripts that are queued for output
$__engineName public

string

Current Javascript Engine that is being used
$__jsVars public

array

Variables to pass to Javascript.
$bufferScripts public

boolean

Whether or not you want scripts to be buffered or output.
$helpers public

array

helpers
$setVariable public

string

The javascript variable created by set() variables.

Inherited Properties

__cleaned, __tainted, action, argSeparator, base, data, here, namedArgs, params, plugin, tags, theme, validationErrors, webroot

Method Summary

__construct() public

Constructor - determines engine helper
_createVars() public

Generates the object string for variables passed to javascript.
_getHtmlOptions() public

Parse a set of Options and extract the Html options. Extracted Html Options are removed from the $options param.
buffer() public

Write a script to the buffered scripts.
call__() public

call__ Allows for dispatching of methods to the Engine Helper. methods in the Engines bufferedMethods list will be automatically buffered. You can control buffering with the buffer param as well. By setting the last parameter to any engine method to a boolean you can force or disable buffering.
getBuffer() public

Get all the buffered scripts
link() public

Generate an 'Ajax' link. Uses the selected JS engine to create a link element that is enhanced with Javascript. Options can include both those for HtmlHelper::link() and JsBaseEngine::request(), JsBaseEngine::event();
object() public deprecated

Workaround for Object::Object() existing. Since Object::object exists, it does not fall into call__ and is not passed onto the engine helper. See JsBaseEngineHelper::object() for more information on this method.
set() public

Pass variables into Javascript. Allows you to set variables that will be output when the buffer is fetched with JsHelper::getBuffer() or JsHelper::writeBuffer() The Javascript variable used to output set variables can be controlled with JsHelper::$setVariable
submit() public

Uses the selected JS engine to create a submit input element that is enhanced with Javascript. Options can include both those for FormHelper::submit() and JsBaseEngine::request(), JsBaseEngine::event();
value() public

Overwrite inherited Helper::value() See JsBaseEngineHelper::value() for more information on this method.
writeBuffer() public

Writes all Javascript generated so far to a code block or caches them to a file and returns a linked script. If no scripts have been buffered this method will return null. If the request is an XHR(ajax) request onDomReady will be set to false. As the dom is already 'ready'.

Method Detail

__construct() public ¶

__construct( array $settings = array() )

Constructor - determines engine helper

Parameters

array $settings optional array(): Settings array contains name of engine helper.

Overrides

Object::__construct()

_createVars() public ¶

_createVars( )

Generates the object string for variables passed to javascript.

Returns

string
Generated JSON object of all set vars

_getHtmlOptions() public ¶

_getHtmlOptions( array $options , array $additional = array() )

Parse a set of Options and extract the Html options. Extracted Html Options are removed from the $options param.

Parameters

array $options: Options to filter.
array $additional optional array(): Array of additional keys to extract and include in the return options array.

Returns

array
Array of js options and Htmloptions

buffer() public ¶

buffer( string $script , boolean $top = false )

Write a script to the buffered scripts.

Parameters

string $script: Script string to add to the buffer.
boolean $top optional false: If true the script will be added to the top of the buffered scripts array. If false the bottom.

call__() public ¶

call__( string $method , array $params )

call__ Allows for dispatching of methods to the Engine Helper. methods in the Engines bufferedMethods list will be automatically buffered. You can control buffering with the buffer param as well. By setting the last parameter to any engine method to a boolean you can force or disable buffering.

e.g. $js->get('#foo')->effect('fadeIn', array('speed' => 'slow'), true);

Will force buffering for the effect method. If the method takes an options array you may also add a 'buffer' param to the options array and control buffering there as well.

e.g. $js->get('#foo')->event('click', $functionContents, array('buffer' => true));

The buffer parameter will not be passed onto the EngineHelper.

Parameters

string $method: Method to be called
array $params: Parameters for the method being called.

Returns

mixed
Depends on the return of the dispatched method, or it could be an instance of the EngineHelper

Overrides

Helper::call__()

getBuffer() public ¶

getBuffer( boolean $clear = true )

Get all the buffered scripts

Parameters

boolean $clear optional true: Whether or not to clear the script caches (default true)

Returns

array
Array of scripts added to the request.

link() public ¶

link( string $title , mixed $url = null , array $options = array() )

Generate an 'Ajax' link. Uses the selected JS engine to create a link element that is enhanced with Javascript. Options can include both those for HtmlHelper::link() and JsBaseEngine::request(), JsBaseEngine::event();

Options

confirm - Generate a confirm() dialog before sending the event.
id - use a custom id.
htmlAttributes - additional non-standard htmlAttributes. Standard attributes are class, id, rel, title, escape, onblur and onfocus.
buffer - Disable the buffering and return a script tag in addition to the link.

Parameters

string $title: Title for the link.
mixed $url optional null: Mixed either a string URL or an cake url array.
array $options optional array(): Options for both the HTML element and Js::request()

Returns

string
Completed link. If buffering is disabled a script tag will be returned as well.

object() public deprecated ¶

object( mixed $data = array() , array $options = array() )

Workaround for Object::Object() existing. Since Object::object exists, it does not fall into call__ and is not passed onto the engine helper. See JsBaseEngineHelper::object() for more information on this method.

Deprecated

Remove when support for PHP4 and Object::object are removed.

Parameters

mixed $data optional array(): Data to convert into JSON
array $options optional array(): Options to use for encoding JSON. See JsBaseEngineHelper::object() for more details.

Returns

string
encoded JSON

set() public ¶

set( mixed $one , mixed $two = null )

Pass variables into Javascript. Allows you to set variables that will be output when the buffer is fetched with JsHelper::getBuffer() or JsHelper::writeBuffer() The Javascript variable used to output set variables can be controlled with JsHelper::$setVariable

Parameters

mixed $one: Either an array of variables to set, or the name of the variable to set.
mixed $two optional null: If $one is a string, $two is the value for that key.

submit() public ¶

submit( string $caption = null , array $options = array() )

Uses the selected JS engine to create a submit input element that is enhanced with Javascript. Options can include both those for FormHelper::submit() and JsBaseEngine::request(), JsBaseEngine::event();

Forms submitting with this method, cannot send files. Files do not transfer over XmlHttpRequest and require an iframe or flash.

Options

url The url you wish the XHR request to submit to.
confirm A string to use for a confirm() message prior to submitting the request.
method The method you wish the form to send by, defaults to POST
buffer Whether or not you wish the script code to be buffered, defaults to true.
Also see options for JsHelper::request() and JsHelper::event()

Parameters

string $caption optional null: $title The display text of the submit button.
array $options optional array(): Array of options to use. See the options for the above mentioned methods.

Returns

string
Completed submit button.

value() public ¶

value( mixed $val , boolean $quoteString = true )

Overwrite inherited Helper::value() See JsBaseEngineHelper::value() for more information on this method.

Parameters

mixed $val: A PHP variable to be converted to JSON
boolean $quoteString optional true: $quoteStrings If false, leaves string values unquoted

Returns

string
a JavaScript-safe/JSON representation of $val

Overrides

Helper::value()

writeBuffer() public ¶

writeBuffer( array $options = array() )

Writes all Javascript generated so far to a code block or caches them to a file and returns a linked script. If no scripts have been buffered this method will return null. If the request is an XHR(ajax) request onDomReady will be set to false. As the dom is already 'ready'.

Options

inline - Set to true to have scripts output as a script block inline if cache is also true, a script link tag will be generated. (default true)
cache - Set to true to have scripts cached to a file and linked in (default false)
clear - Set to false to prevent script cache from being cleared (default true)
onDomReady - wrap cached scripts in domready event (default true)
safe - if an inline block is generated should it be wrapped in (default true)

Parameters

array $options optional array(): options for the code block

Returns

mixed

Completed javascript tag if there are scripts, if there are no buffered scripts null will be returned.

Methods inherited from Helper

__clean() public ¶

__clean( )

Removes harmful content from output

__formatAttribute() public ¶

__formatAttribute( string $key , string $value , $escape = true )

Formats an individual attribute, and returns the string value of the composed attribute. Works with minimized attributes that have the same value as their name such as 'disabled' and 'checked'

Parameters

string $key: The name of the attribute to create
string $value: The value of the attribute to create.
$escape optional true

Returns

string
The composed attribute.

__reset() public ¶

__reset( )

Resets the vars used by Helper::clean() to null

__selectedArray() public ¶

__selectedArray( mixed $data , string $key = 'id' )

Transforms a recordset from a hasAndBelongsToMany association to a list of selected options for a multiple select element

Parameters

mixed $data
string $key optional 'id'

Returns

array

_initInputField() public ¶

_initInputField( string $field , array $options = array() )

Sets the defaults for an input tag. Will set the name, value, and id attributes for an array of html attributes. Will also add a 'form-error' class if the field contains validation errors.

Parameters

string $field: The field name to initialize.
array $options optional array(): Array of options to use while initializing an input field.

Returns

array
Array options for the form input.

_name() public ¶

_name( mixed $options = array() , string $field = null , string $key = 'name' )

Gets the input field name for the current tag. Creates input name attributes using CakePHP's data[Model][field] formatting.

Parameters

mixed $options optional array(): If an array, should be an array of attributes that $key needs to be added to. If a string or null, will be used as the View entity.
string $field optional null
string $key optional 'name': The name of the attribute to be set, defaults to 'name'

Returns

mixed

If an array was given for $options, an array with $key set will be returned. If a string was supplied a string will be returned.

_parseAttributes() public ¶

_parseAttributes( array $options , array $exclude = null , string $insertBefore = ' ' , string $insertAfter = null )

Returns a space-delimited string with items of the $options array. If a key of $options array happens to be one of:

'compact'
'checked'
'declare'
'readonly'
'disabled'
'selected'
'defer'
'ismap'
'nohref'
'noshade'
'nowrap'
'multiple'
'noresize'

And its value is one of:

'1' (string)
1 (integer)
true (boolean)
'true' (string)

Then the value will be reset to be identical with key's name. If the value is not one of these 3, the parameter is not output.

'escape' is a special option in that it controls the conversion of attributes to their html-entity encoded equivalents. Set to false to disable html-encoding.

If value for any option key is set to null or false, that option will be excluded from output.

Parameters

array $options: Array of options.
array $exclude optional null: Array of options to be excluded, the options here will not be part of the return.
string $insertBefore optional ' ': String to be inserted before options.
string $insertAfter optional null: String to be inserted after options.

Returns

string
Composed attributes.

addClass() public ¶

addClass( array $options = array() , string $class = null , string $key = 'class' )

Adds the given class to the element options

Parameters

array $options optional array(): Array options/attributes to add a class to
string $class optional null: The classname being added.
string $key optional 'class': the key to use for class.

Returns

array
Array of options with $key set.

afterLayout() public ¶

afterLayout( )

After layout callback. afterLayout is called after the layout has rendered.

Overridden in subclasses.

afterRender() public ¶

afterRender( )

After render callback. afterRender is called after the view file is rendered but before the layout has been rendered.

Overridden in subclasses.

assetTimestamp() public ¶

assetTimestamp( string $path )

Adds a timestamp to a file based resource based on the value of Asset.timestamp in Configure. If Asset.timestamp is true and debug > 0, or Asset.timestamp == 'force' a timestamp will be added.

Parameters

string $path: The file path to timestamp, the path must be inside WWW_ROOT

Returns

string
Path with a timestamp added, or not.

beforeLayout() public ¶

beforeLayout( )

Before layout callback. beforeLayout is called before the layout is rendered.

Overridden in subclasses.

beforeRender() public ¶

beforeRender( )

Before render callback. beforeRender is called before the view file is rendered.

Overridden in subclasses.

clean() public ¶

clean( mixed $output )

Used to remove harmful tags from content. Removes a number of well known XSS attacks from content. However, is not guaranteed to remove all possiblities. Escaping content is the best way to prevent all possible attacks.

Parameters

mixed $output: Either an array of strings to clean or a single string to clean.

Returns

cleaned
content for output

domId() public ¶

domId( mixed $options = null , string $id = 'id' )

Generates a DOM ID for the selected element, if one is not set. Uses the current View::entity() settings to generate a CamelCased id attribute.

Parameters

mixed $options optional null: Either an array of html attributes to add $id into, or a string with a view entity path to get a domId for.
string $id optional 'id': The name of the 'id' attribute.

Returns

mixed

If $options was an array, an array will be returned with $id set. If a string was supplied, a string will be returned.

field() public ¶

field( )

Gets the currently-used model field of the rendering context.

Returns

string

get__() public ¶

get__( $name )

Default overload methods

loadConfig() public ¶

loadConfig( $name = 'tags' )

Parses tag templates into $this->tags.

Parameters

$name optional 'tags': name inside app/config to load.

Returns

array
merged tags from config/$name.php

model() public ¶

model( )

Gets the currently-used model of the rendering context.

Returns

string

modelID() public ¶

modelID( )

Gets the ID of the currently-used model of the rendering context.

Returns

mixed

output() public deprecated ¶

output( string $str )

Returns a string generated by a helper method

This method can be overridden in subclasses to do generalized output post-processing

Deprecated

This method will be removed in future versions.

Parameters

string $str: String to be output.

Returns

string

setEntity() public ¶

setEntity( mixed $entity , boolean $setScope = false )

Sets this helper's model and field properties to the dot-separated value-pair in $entity.

Parameters

mixed $entity: A field name, like "ModelName.fieldName" or "ModelName.ID.fieldName"
boolean $setScope optional false: Sets the view scope to the model specified in $tagValue

set__() public ¶

set__( $name , $value )

tagIsInvalid() public ¶

tagIsInvalid( string $model = null , string $field = null , integer $modelID = null )

Returns null if given FORM field has no errors. Otherwise it returns the constant set in the array Model->validationErrors.

Parameters

string $model optional null: Model name as a string
string $field optional null: Fieldname as a string
integer $modelID optional null: Unique index identifying this record within the form

Returns

mixed
Null if no errors, string with error otherwhise.

url() public ¶

url( mixed $url = null , boolean $full = false )

Finds URL for specified action.

Returns a URL pointing at the provided parameters.

Parameters

mixed $url optional null: Either a relative string url like /products/view/23 or an array of url parameters. Using an array for urls will allow you to leverage the reverse routing features of CakePHP.
boolean $full optional false: If true, the full base URL will be prepended to the result

Returns

string
Full translated URL with base path.

Link

http://book.cakephp.org/view/1448/url

webroot() public ¶

webroot( string $file )

Checks if a file exists when theme is used, if no file is found default location is returned

Parameters

string $file: The file to create a webroot path to.

Returns

string
Web accessible path to file.

Methods inherited from Overloadable

__call() public ¶

__call( string $method , array $params )

Magic method handler.

Parameters

string $method: Method name
array $params: Parameters to send to method

Returns

mixed
Return value from method

overload() public ¶

overload( )

Overload implementation. No need for implementation in PHP5.

Methods inherited from Object

Object() public ¶

Object( )

A hack to support __construct() on PHP 4 Hint: descendant classes have no PHP4 class_name() constructors, so this constructor gets called first and calls the top-layer __construct() which (if present) should call parent::__construct()

Returns

Object

__openPersistent() public ¶

__openPersistent( string $name , string $type = null )

Open the persistent class file for reading Used by Object::_persist()

Parameters

string $name: Name of persisted class
string $type optional null: Type of persistance (e.g: registry)

_persist() public ¶

_persist( string $name , string $return , $object , $type = null )

Checks for a persistent class file, if found file is opened and true returned If file is not found a file is created and false returned If used in other locations of the model you should choose a unique name for the persistent file There are many uses for this method, see manual for examples

Parameters

string $name: name of the class to persist
string $return: $object the object to persist
$object
$type optional null

Returns

boolean
Success

_savePersistent() public ¶

_savePersistent( string $name , object $object )

You should choose a unique name for the persistent file

There are many uses for this method, see manual for examples

Parameters

string $name: name used for object to cache
object $object: the object to persist

Returns

boolean
true on save, throws error if file can not be created

_set() public ¶

_set( array $properties = array() )

Allows setting of multiple properties of the object in a single line of code. Will only set properties that are part of a class declaration.

Parameters

array $properties optional array(): An associative array containing properties and corresponding values.

_stop() public ¶

_stop( $status = 0 )

Stop execution of the current script. Wraps exit() making testing easier.

Parameters

$status optional 0: http://php.net/exit for values

cakeError() public ¶

cakeError( string $method , array $messages = array() )

Used to report user friendly errors. If there is a file app/error.php or app/app_error.php this file will be loaded error.php is the AppError class it should extend ErrorHandler class.

Parameters

string $method: Method to be called in the error class (AppError or ErrorHandler classes)
array $messages optional array(): Message that is to be displayed by the error class

Returns

error
message

dispatchMethod() public ¶

dispatchMethod( string $method , array $params = array() )

Calls a method on this object with the given parameters. Provides an OO wrapper for call_user_func_array

Parameters

string $method: Name of the method to call
array $params optional array(): Parameter list to use when calling $method

Returns

mixed
Returns the result of the method call

log() public ¶

log( string $msg , integer $type = LOG_ERROR )

Convience method to write a message to CakeLog. See CakeLog::write() for more information on writing to logs.

Parameters

string $msg: Log message
integer $type optional LOG_ERROR: Error type constant. Defined in app/config/core.php.

Returns

boolean
Success of log write

requestAction() public ¶

requestAction( mixed $url , array $extra = array() )

Calls a controller's method from any location. Can be used to connect controllers together or tie plugins into a main application. requestAction can be used to return rendered views or fetch the return value from controller actions.

Parameters

mixed $url: String or array-based url.
array $extra optional array(): if array includes the key "return" it sets the AutoRender to true.

Returns

mixed

Boolean true or false on success/failure, or contents of rendered action if 'return' is set in $extra.

toString() public ¶

toString( )

Object-to-string conversion. Each class can override this method as necessary.

Returns

string
The name of this class

Properties detail

`$__bufferedScripts` ¶

public array

Scripts that are queued for output

See

JsHelper::buffer()

array()

`$__engineName` ¶

public string

Current Javascript Engine that is being used

`$__jsVars` ¶

public array

Variables to pass to Javascript.

See

JsHelper::set()

array()

`$bufferScripts` ¶

public boolean

Whether or not you want scripts to be buffered or output.

true

`$helpers` ¶

public array

helpers

array('Html', 'Form')

`$setVariable` ¶

public string

The javascript variable created by set() variables.

'app'

Classes

Functions

Class JsHelper

Properties summary

Inherited Properties

Method Summary

__construct() public

_createVars() public

_getHtmlOptions() public

buffer() public

call__() public

getBuffer() public

link() public

object() public deprecated

set() public

submit() public

value() public

writeBuffer() public

Method Detail

__construct() public ¶

Parameters

Overrides

_createVars() public ¶

Returns

_getHtmlOptions() public ¶

Parameters

Returns

buffer() public ¶

Parameters

call__() public ¶

Parameters

Returns

Overrides

getBuffer() public ¶

Parameters

Returns

link() public ¶

Options

Parameters

Returns

object() public deprecated ¶

Deprecated

Parameters

Returns

set() public ¶

Parameters

submit() public ¶

Options

Parameters

Returns

value() public ¶

Parameters

Returns

Overrides

writeBuffer() public ¶

Options

Parameters

Returns

Methods inherited from Helper

__clean() public ¶

__formatAttribute() public ¶

Parameters

Returns

__reset() public ¶

__selectedArray() public ¶

Parameters

Returns

_initInputField() public ¶

Parameters

Returns

_name() public ¶

Parameters

Returns

_parseAttributes() public ¶

Parameters

Returns

addClass() public ¶

Parameters

Returns

afterLayout() public ¶