Yii Framework v1.1.10 类参考

CSort

包	system.web
继承	class CSort » CComponent
版本	$Id: CSort.php 3554 2012-02-08 16:31:30Z alexander.makarow $
源码	framework/web/CSort.php

属性详细

list of attributes that are allowed to be sorted. For example, array('user_id','create_time') would specify that only 'user_id' and 'create_time' of the model modelClass can be sorted. By default, this property is an empty array, which means all attributes in modelClass are allowed to be sorted.

This property can also be used to specify complex sorting. To do so, a virtual attribute can be declared in terms of a key-value pair in the array. The key refers to the name of the virtual attribute that may appear in the sort request, while the value specifies the definition of the virtual attribute.

In the simple case, a key-value pair can be like 'user'=>'user_id' where 'user' is the name of the virtual attribute while 'user_id' means the virtual attribute is the 'user_id' attribute in the modelClass.

A more flexible way is to specify the key-value pair as

'user'=>array(
    'asc'=>'first_name, last_name',
    'desc'=>'first_name DESC, last_name DESC',
    'label'=>'Name'
)

where 'user' is the name of the virtual attribute that specifies the full name of user (a compound attribute consisting of first name and last name of user). In this case, we have to use an array to define the virtual attribute with three elements: 'asc', 'desc' and 'label'.

The above approach can also be used to declare virtual attributes that consist of relational attributes. For example,

'price'=>array(
    'asc'=>'item.price',
    'desc'=>'item.price DESC',
    'label'=>'Item Price'
)

Note, the attribute name should not contain '-' or '.' characters because they are used as separators.

Starting from version 1.1.3, an additional option named 'default' can be used in the virtual attribute declaration. This option specifies whether an attribute should be sorted in ascending or descending order upon user clicking the corresponding sort hyperlink if it is not currently sorted. The valid option values include 'asc' (default) and 'desc'. For example,

'price'=>array(
    'asc'=>'item.price',
    'desc'=>'item.price DESC',
    'label'=>'Item Price',
    'default'=>'desc',
)

Also starting from version 1.1.3, you can include a star ('*') element in this property so that all model attributes are available for sorting, in addition to those virtual attributes. For example,

'attributes'=>array(
    'price'=>array(
        'asc'=>'item.price',
        'desc'=>'item.price DESC',
        'label'=>'Item Price',
        'default'=>'desc',
    ),
    '*',
)

Note that when a name appears as both a model attribute and a virtual attribute, the position of the star element in the array determines which one takes precedence. In particular, if the star element is the first element in the array, the model attribute takes precedence; and if the star element is the last one, the virtual attribute takes precedence.

the default order that should be applied to the query criteria when the current request does not specify any sort. For example, 'name, create_time DESC' or 'UPPER(name)'.

Starting from version 1.1.3, you can also specify the default order using an array. The array keys could be attribute names or virtual attribute names as declared in attributes, and the array values indicate whether the sorting of the corresponding attributes should be in descending order. For example,

'defaultOrder'=>array(
    'price'=>CSort::SORT_DESC,
)

Please note when using array to specify the default order, the corresponding attributes will be put into directions and thus affect how the sort links are rendered (e.g. an arrow may be displayed next to the currently active sort link).

the tag appeared in the GET parameter that indicates the attribute should be sorted in descending order. Defaults to 'desc'.

Returns the currently requested sort information.

the name of the model class whose attributes can be sorted. The model class must be a child class of CActiveRecord.

whether the sorting can be applied to multiple attributes simultaneously. Defaults to false, which means each time the data can only be sorted by one attribute.

the order-by columns represented by this sort object. This can be put in the ORDER BY clause of a SQL statement.

the additional GET parameters (name=>value) that should be used when generating sort URLs. Defaults to null, meaning using the currently available GET parameters.

the route (controller ID and action ID) for generating the sorted contents. Defaults to empty string, meaning using the currently requested route.

separators used in the generated URL. This must be an array consisting of two elements. The first element specifies the character separating different attributes, while the second element specifies the character separating attribute name and the corresponding sort direction. Defaults to array('-','.').

the name of the GET parameter that specifies which attributes to be sorted in which direction. Defaults to 'sort'.

方法详细

public void __construct(string $modelClass=NULL)
$modelClass	string	the class name of data models that need to be sorted. This should be a child class of CActiveRecord.

Constructor.

public void applyOrder(CDbCriteria $criteria)
$criteria	CDbCriteria	the query criteria

Modifies the query criteria by changing its CDbCriteria::order property. This method will use directions to determine which columns need to be sorted. They will be put in the ORDER BY clause. If the criteria already has non-empty CDbCriteria::order value, the new value will be appended to it.

protected string createLink(string $attribute, string $label, string $url, array $htmlOptions)
$attribute	string	the name of the attribute that this link is for
$label	string	the label of the hyperlink
$url	string	the URL
$htmlOptions	array	additional HTML options
{return}	string	the generated hyperlink

Creates a hyperlink based on the given label and URL. You may override this method to customize the link generation.

public string createUrl(CController $controller, array $directions)
$controller	CController	the controller that will be used to create the URL.
$directions	array	the sort directions indexed by attribute names. The sort direction can be either CSort::SORT_ASC for ascending order or CSort::SORT_DESC for descending order.
{return}	string	the URL for sorting

Creates a URL that can lead to generating sorted data.

public mixed getDirection(string $attribute)
$attribute	string	the attribute name
{return}	mixed	Sort direction of the attribute. Can be either CSort::SORT_ASC for ascending order or CSort::SORT_DESC for descending order. Value is null if the attribute doesn't need to be sorted.

Returns the sort direction of the specified attribute in the current request.

public array getDirections()
{return}	array	sort directions indexed by attribute names. Sort direction can be either CSort::SORT_ASC for ascending order or CSort::SORT_DESC for descending order.

Returns the currently requested sort information.

public string getOrderBy()
{return}	string	the order-by columns represented by this sort object. This can be put in the ORDER BY clause of a SQL statement.

public string link(string $attribute, string $label=NULL, array $htmlOptions=array ( ))
$attribute	string	the attribute name. This must be the actual attribute name, not alias. If it is an attribute of a related AR object, the name should be prefixed with the relation name (e.g. 'author.name', where 'author' is the relation name).
$label	string	the link label. If null, the label will be determined according to the attribute (see resolveLabel).
$htmlOptions	array	additional HTML attributes for the hyperlink tag
{return}	string	the generated hyperlink

Generates a hyperlink that can be clicked to cause sorting.

public mixed resolveAttribute(string $attribute)
$attribute	string	the attribute name that the user requests to sort on
{return}	mixed	the attribute name or the virtual attribute definition. False if the attribute cannot be sorted.

Returns the real definition of an attribute given its name.

The resolution is based on attributes and CActiveRecord::attributeNames.

• When attributes is an empty array, if the name refers to an attribute of modelClass, then the name is returned back.
• When attributes is not empty, if the name refers to an attribute declared in attributes, then the corresponding virtual attribute definition is returned. Starting from version 1.1.3, if attributes contains a star ('*') element, the name will also be used to match against all model attributes.
• In all other cases, false is returned, meaning the name does not refer to a valid attribute.

public string resolveLabel(string $attribute)
$attribute	string	the attribute name.
{return}	string	the attribute label

Resolves the attribute label for the specified attribute. This will invoke CActiveRecord::getAttributeLabel to determine what label to use. If the attribute refers to a virtual attribute declared in attributes, then the label given in the attributes will be returned instead.

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