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Man Pages


Manual Reference Pages  -  ROSE::HTML::OBJECT (3)

.ds Aq ’

NAME

Rose::HTML::Object - HTML object base class.

CONTENTS

SYNOPSIS



  #
  # Generic HTML construction
  #

  $o = Rose::HTML::Object->new(p);
  $o->push_child(Hi);

  print $o->html; # <p>hi</p>

  $br = Rose::HTML::Object->new(element => br, is_self_closing => 1);

  print $br->html;  # <br>
  print $br->xhtml; # <br />

  $o->unshift_children($br,  ); # add two children

  print $o->html; # <p><br> Hi</p>

  $b = Rose::HTML::Object->new(body, children => $o);

  print $b->html; # <body><p><br> Hi</p></body>

  foreach my $object ($b->descendants)
  {
    ...
  }

  $d = Rose::HTML::Object->new(div, class => x);

  $b->child(0)->parent($d); # re-parent: $o now belongs to $d

  print $b->html; # <body></body>
  print $d->html; # <div class="x"><p><br> Hi</p></div>

  #
  # Subclass to add strictures
  #

  package MyTag;

  use base Rose::HTML::Object;

  __PACKAGE__->add_valid_html_attrs
  (
    foo,
    bar,
    baz,
    ...
  );

  __PACKAGE__->add_required_html_attrs(
  {
    foo => 5,  # with default value
    goo => , # required implies valid
  });

  __PACKAGE__->add_boolean_html_attrs
  (
    selected, # boolean implies valid
  );

  sub html_element  { mytag }
  sub xhtml_element { mytag }

  ...

  my $o = MyTag->new(bar => hello, selected => 1);

  # prints: bar="hello" foo="5" goo="" selected
  print $o->html_attrs_string; 

  # prints: bar="hello" foo="5" goo="" selected="selected"
  print $o->xhtml_attrs_string;

  $o->html_attr(selected => 0);

  print "Has bar\n"  if($o->html_attr_exists(bar));
  $o->delete_html_attr(bar);

  $o->is_self_closing(1);

  print $o->html_tag;  # <mytag foo="5" goo="">
  print $o->xhtml_tag; # <mytag foo="5" goo="" />
  ...



DESCRIPTION

Rose::HTML::Object is the base class for HTML objects. It defines the HTML element name, provides methods for specifying, manipulating, and validating HTML attributes, and can serialize itself as either HTML or XHTML.

This class inherits from, and follows the conventions of, Rose::Object. See the Rose::Object documentation for more information.

HIERARCHY

Each Rose::HTML::Object may have zero or more children, each of which is another Rose::HTML::Object (or Rose::HTML::Object-derived) object. The html produced for an object will include the HTML for all of its descendants.

VALIDATION

Although several methods, data structures, and policies exist to aid the creation of valid HTML, they are in no way a replacement for real markup validation.

This class and those that inherit from it try to support a superset of the elements and attributes specified in the HTML 4.01 and XHTML 1.x specifications. As a result, these classes will tend to be more permissive than actual validation. The support of these standards is not exhaustive, and will inevitably expand. Also remember that there are several variant DTDs that make up XHTML 1.x. By trying to support a superset of these standards, this class can’t correctly enforce the rules of any individual standard.

So I say again: these classes are not a replacement for real markup validation. Use an external validator.

Going forward, the compatibility policy of these classes is that attribute specifications may be added in the future, but existing attribute specifications will never be removed (unless they originally existed in error, i.e., were never part of any HTML 4.01 or XHTML 1.x standard).

This support policy is pragmatic rather than ideological. There is enough default validation to catch most typos or other unintentional errors, but not so much that the entire class hierarchy is weighed down by language lawyering and bookkeeping.

If the runtime overhead of validating every HTML attribute is deemed too onerous, it can be turned off on a per-object basis with the validate_html_attrs method. Subclasses can set this attribute during object construction to make the effect class-wide. (You will also want to look at the autoload_html_attr_methods class attribute.)

There are also methods for adding and removing valid, required, and boolean HTML attributes for a class.

Finally, all element and attribute names are case-sensitive and lowercase in order to comply with XHTML (and to be easy to type).

CLASS METHODS

These class methods can be called with a class name or an object as the invocant. Either way, remember that the data structures and attributes affected are part of the class as a whole, not any individual object. For example, adding a valid HTML attribute makes it valid for all objects of the class, including any objects that already exist.

Many of the class methods manipulate inheritable sets, inherited sets, or inherited hashes. See the Rose::Class::MakeMethods::Set and Rose::Class::MakeMethods::Generic documentation for an explanation of these method types.

The sets of valid and boolean HTML attributes are inherited sets. The set of required HTML attributes is an inheritable set. The object_type_classes map is an inherited hash.

The inheritance behavior of these sets is noted here in order to facilitate subclassing. But it is an implementation detail, not a part of the public API. The requirements of the APIs themselves do not include any particular inheritance behavior.
<B>add_boolean_html_attr NAMEB> Adds a value to the list of boolean HTML attributes for this class. Boolean HTML attributes appear without values in HTML tags, (e.g., <dl compact>) or with fixed values in XHTML tags (e.g., <dl compact=compact>)
<B>add_boolean_html_attrs NAME1, NAME2, ...B> Adds one or more values to the list of boolean HTML attributes for this class. Boolean HTML attributes appear without values in HTML tags, (e.g., <dl compact>) or with fixed values in XHTML tags (e.g., <dl compact=compact>)
<B>add_object_type_classes [MAP]B> Add entries to the object_type_classes hash that maps object type strings to the names of the Rose::HTML::Object-derived classes. Example:



    My::HTML::Form->add_object_type_classes
    (
      blockquote => My::HTML::Blockquote,
      abbr       => My::HTML::Abbr,
      ...
    );



<B>add_required_html_attr NAME [, DEFAULT]B> Adds a value to the list of required HTML attributes for this class. Required HTML attributes will always appear in the HTML tag, with or without a non-empty value. You can set the default value for a required HTML attribute using the required_html_attr_value method or by passing the DEFAULT parameter to this method.
<B>add_required_html_attrs NAME1, NAME2, ... | HASHREFB> Adds one or more values to the list of required HTML attributes for this class. Required HTML attributes will always appear in the HTML tag, with or without a non-empty value. You can set the default value for a required HTML attribute using the required_html_attr_value method or by passing a reference to a hash containing name/default pairs.
<B>add_valid_html_attr NAMEB> Adds a value to the list of valid HTML attributes for this class. If the object property validate_html_attrs is true, then only valid attributes can be added to an object of this class.
<B>add_valid_html_attrs NAME1, NAME2, ...B> Adds one or more values to the list of valid HTML attributes for this class. If the object property validate_html_attrs is true, then only valid attributes can be added to an object of this class.
<B>autoload_html_attr_methods [BOOL]B> Get or set the boolean flag that determines whether or not any valid HTML attribute can be used as a method call of the same name. The default is true, and the value is inherited by subclasses unless overridden.

In the case of a name conflict, the existing method is called and a new method is not auto-created for the HTML attribute of the same name.

Examples:



    MyTag->add_valid_html_attrs(foo, bar, error);

    $o = MyTag->new;

    # Auto-created method, equivalent to $o->html_attr(foo => 5)
    $o->foo(5);

    # Fatal error: invalid HTML attribute and not an existing method
    print $o->blah;

    MyTag->autoload_html_attr_methods(0); # stop autoloading

    # Fatal error: method does not exist and was never auto-created
    print $o->bar;

    # This still works: once the method is auto-created, it stays
    print $o->foo; # prints "5"

    # Calls the existing error() object method; does not affect
    # the HTML attribute named "error"
    $o->error(99);



Yes, the existence of this capability means that adding a method to a future version of a Rose::HTML::Object-derived class that has the same name as a valid HTML attribute may cause older code that calls the auto-created method of the same name to break.

To avoid this, you can choose not to use any auto-created methods, opting instead to use the html_attr method everywhere (and you can set autoload_html_attr_methods to false to make sure that you don’t accidentally use such a method).

<B>boolean_html_attrsB> Returns a reference to a sorted list of boolean HTML attributes in scalar context, or a sorted list of boolean HTML attributes in list context. The default set of boolean HTML attributes is empty.

See the introduction to the CLASS METHODS section for more information about the inherited set implementation used by the set of boolean HTML attributes.

<B>default_html_attr_value NAME [, VALUE]B> Returns the default value for the HTML attribute NAME.

If passed both an attribute NAME and a VALUE, it adds NAME to the set of required HTML attributes and sets its default value to VALUE.

<B>default_locale [LOCALE]B> Get or set the default locale for this class. The default value en.
<B>default_localizer [LOCALIZER]B> Get or set the default Rose::HTML::Object::Message::Localizer-derived localizer object. Defaults to a new Rose::HTML::Object::Message::Localizer-derived object.
<B>delete_boolean_html_attr NAMEB> Removes the HTML attribute NAME from the set of boolean HTML attributes.
<B>delete_object_type_class TYPEB> Delete the type/class mapping entry for the object type TYPE.
<B>delete_required_html_attr NAMEB> Removes the HTML attribute NAME from the set of required HTML attributes.
<B>delete_valid_html_attr NAMEB> Removes the HTML attribute NAME from the set of valid HTML attributes. The attribute is also removed from the set of required and boolean HTML attributes, if it existed in either set.
<B>html_attr_is_boolean NAMEB> Returns a boolean value indicating whether or not the attribute NAME is a boolean HTML attribute. A boolean attribute must also be a valid attribute.
<B>html_attr_is_required NAMEB> Returns a boolean value indicating whether or not the attribute NAME is a required HTML attribute. A required attribute must also be a valid attribute.
<B>html_attr_is_valid NAMEB> Returns a boolean value indicating whether or not the attribute NAME is a valid HTML attribute.
<B>load_all_messagesB> Ask the localizer to load_all_messages from this class.
<B>locale [LOCALE]B> This method may be called as a class method or an object method.

When called as a class method and a LOCALE is passed, then the default_locale is set. When called as an object method and a LOCALE is passed, then the locale of this object is set.

If no locale is set for this class (when called as a class method) then the localizer’s locale is returned, if it is set. Otherwise, the default_locale is returned.

If no locale is set for this object (when called as an object method), then the the first defined locale from the object’s parent_group, parent_field, parent_form, or generic parent is returned. If none of those locales are defined, then the localizer’s locale is returned, if it is set. Otherwise, the default_locale is returned.

<B>object_type_class TYPE [, CLASS]B> Given the object type string TYPE, return the name of the Rose::HTML::Object-derived class mapped to that name. If a CLASS is passed, the object type TYPE is mapped to CLASS.

This map of type names to classes is an inherited hash representing the union of the hashes of all superclasses, minus any keys that are explicitly deleted in the current class.

<B>object_type_classes [MAP]B> Get or set the hash that maps object type strings to the names of the Rose::HTML::Object-derived classes.

If passed MAP (a list of type/class pairs or a reference to a hash of the same) then MAP replaces the current object type mapping. Returns a list of type/class pairs (in list context) or a reference to a hash of type/class mappings (in scalar context).

This map of type names to classes is an inherited hash representing the union of the hashes of all superclasses, minus any keys that are explicitly deleted in the current class.

The default mapping of type names to class names is:



  image              => Rose::HTML::Image
  label              => Rose::HTML::Label
  link               => Rose::HTML::Link
  script             => Rose::HTML::Script
  literal text       => Rose::HTML::Text

  form               => Rose::HTML::Form
  repeatable form    => Rose::HTML::Form::Repeatable

  text               => Rose::HTML::Form::Field::Text
  scalar             => Rose::HTML::Form::Field::Text
  char               => Rose::HTML::Form::Field::Text
  character          => Rose::HTML::Form::Field::Text
  varchar            => Rose::HTML::Form::Field::Text
  string             => Rose::HTML::Form::Field::Text

  text area          => Rose::HTML::Form::Field::TextArea
  textarea           => Rose::HTML::Form::Field::TextArea
  blob               => Rose::HTML::Form::Field::TextArea

  option             => Rose::HTML::Form::Field::Option
  option group       => Rose::HTML::Form::Field::OptionGroup

  checkbox           => Rose::HTML::Form::Field::Checkbox
  check              => Rose::HTML::Form::Field::Checkbox

  radio button       => Rose::HTML::Form::Field::RadioButton
  radio              => Rose::HTML::Form::Field::RadioButton

  checkboxes         => Rose::HTML::Form::Field::CheckboxGroup
  checks             => Rose::HTML::Form::Field::CheckboxGroup
  checkbox group     => Rose::HTML::Form::Field::CheckboxGroup
  check group        => Rose::HTML::Form::Field::CheckboxGroup

  radio buttons      => Rose::HTML::Form::Field::RadioButtonGroup
  radios             => Rose::HTML::Form::Field::RadioButtonGroup
  radio button group => Rose::HTML::Form::Field::RadioButtonGroup
  radio group        => Rose::HTML::Form::Field::RadioButtonGroup

  pop-up menu        => Rose::HTML::Form::Field::PopUpMenu
  popup menu         => Rose::HTML::Form::Field::PopUpMenu
  menu               => Rose::HTML::Form::Field::PopUpMenu

  select box         => Rose::HTML::Form::Field::SelectBox
  selectbox          => Rose::HTML::Form::Field::SelectBox
  select             => Rose::HTML::Form::Field::SelectBox

  submit             => Rose::HTML::Form::Field::Submit
  submit button      => Rose::HTML::Form::Field::Submit

  reset              => Rose::HTML::Form::Field::Reset
  reset button       => Rose::HTML::Form::Field::Reset

  file               => Rose::HTML::Form::Field::File
  upload             => Rose::HTML::Form::Field::File

  password           => Rose::HTML::Form::Field::Password

  hidden             => Rose::HTML::Form::Field::Hidden

  num                => Rose::HTML::Form::Field::Numeric
  number             => Rose::HTML::Form::Field::Numeric
  numeric            => Rose::HTML::Form::Field::Numeric

  int                => Rose::HTML::Form::Field::Integer
  integer            => Rose::HTML::Form::Field::Integer

  email              => Rose::HTML::Form::Field::Email

  phone              => Rose::HTML::Form::Field::PhoneNumber::US
  phone us           => Rose::HTML::Form::Field::PhoneNumber::US

  phone us split =>
    Rose::HTML::Form::Field::PhoneNumber::US::Split

  set  => Rose::HTML::Form::Field::Set

  time => Rose::HTML::Form::Field::Time

  time split hms =>
    Rose::HTML::Form::Field::Time::Split::HourMinuteSecond

  time hours       => Rose::HTML::Form::Field::Time::Hours
  time minutes     => Rose::HTML::Form::Field::Time::Minutes
  time seconds     => Rose::HTML::Form::Field::Time::Seconds

  date             => Rose::HTML::Form::Field::Date
  datetime         => Rose::HTML::Form::Field::DateTime

  datetime range   => Rose::HTML::Form::Field::DateTime::Range

  datetime start   => Rose::HTML::Form::Field::DateTime::StartDate
  datetime end     => Rose::HTML::Form::Field::DateTime::EndDate

  datetime split mdy =>
    Rose::HTML::Form::Field::DateTime::Split::MonthDayYear

  datetime split mdyhms =>
    Rose::HTML::Form::Field::DateTime::Split::MDYHMS



<B>required_html_attrsB> Returns a reference to a sorted list of required HTML attributes in scalar context, or a sorted list of required HTML attributes in list context. The default set of required HTML attributes is empty.

Required HTML attributes are included in the strings generated by the html_attrs_string and xhtml_attrs_string methods, even if they have been deleted using the delete_html_attr method or one of its variants. If a required HTML attribute does not have a default value, its value defaults to an empty string or, if the attribute is also boolean, the name of the attribute.

See the introduction to the CLASS METHODS section for more information about the inheritable set implementation used by the set of boolean HTML attributes.

<B>required_html_attr_value ATTR [, VALUE]B> Get or set the default value of the required HTML attrbute ATTR. If both ATTR and VALUE are passed, the value is set. The current value is returned.
<B>valid_html_attrsB> Returns a reference to a sorted list of valid HTML attributes in scalar context, or a sorted list of valid HTML attributes in list context. The default set is:



    id
    class
    style
    title
    lang
    xml:lang
    dir
    onclick
    ondblclick
    onmousedown
    onmouseup
    onmouseover
    onmousemove
    onmouseout
    onkeypress
    onkeydown
    onkeyup



See the VALIDATION section for more on the philosophy and policy of validation. See the introduction to the CLASS METHODS section for more information about the inherited set implementation used by the set of valid HTML attributes.

<B>xhtml_element [NAME]B> Get or set the name of the XHTML element. The XHTML element is the name of the tag, e.g. img, p, a, select, textarea, etc.

This attribute may be read-only in subclasses, but is read/write here for increased flexibility. The value is inherited by subclasses.

CONSTRUCTOR

<B>new [ PARAMS | ELEMENT, PARAMS ]B> Constructs a new Rose::HTML::Object object. If an odd number of arguments is passed, the first argument is taken as the value for the element parameter. Otherwise an even number of PARAMS name/value pairs are expected. Any object method is a valid parameter name.

OBJECT METHODS

<B>add_child OBJECTB> This is an alias for the push_child method.
<B>add_children OBJECTSB> This is an alias for the push_children method.
<B>child INTB> Returns the child at the index specified by INT. The first child is at index zero (0).
<B>children [LIST]B> Get or set the list of Rose::HTML::Object-derived objects that are contained within, or otherwise children of this object. Any plain scalar in LIST is converted to a Rose::HTML::Text object, with the scalar used as the value of the text attribute.

Returns a list (in list context) or a reference to an array (in scalar context) of Rose::HTML::Object-derived objects. The array reference return value should be treated as read-only. The individual items may be treated as read/write provided that you understand that you’re modifying the actual children, not copies.

<B>clear_all_html_attrsB> Clears all the HTML attributes by settings their values to undef.
<B>clear_html_attr NAMEB> Clears the HTML attribute NAME by settings its value to undef.
<B>clear_html_attrs NAME1, NAME2, ...B> Clears the HTML attributes specified by NAME1, NAME2, etc. by settings their values to undef.
<B>delete_all_html_attrsB> Deletes all the HTML attributes.
<B>delete_child [ INDEX | OBJECT ]B> Delete the child at INDEX (starting from zero) or the exact child OBJECT.
<B>delete_childrenB> Deletes all children.
<B>delete_html_attr NAMEB> Deletes the HTML attribute NAME.
<B>delete_html_attrs NAME1, NAME2, ...B> Deletes the HTML attributes specified by NAME1, NAME2, etc.
<B>descendantsB> Returns a list of the children of this object, plus all their children, and so on.
<B>element [NAME]B> If passed a NAME, sets both html_element and xhtml_element to NAME. Returns html_element.
<B>error [TEXT]B> Get or set an error string.
<B>error_id [ID [, ARGS]]B> Get or set an integer error id. When setting the error id, an optional ARGS hash reference should be passed if the localized text for the corresponding message contains any placeholders. Example:



  # Set error id, passing args for the label and value placeholders
  $obj->error_id(NUM_ABOVE_MAX, { label => $l, => value => $v });



<B>escape_html [BOOL]B> This flag may be used by other methods to decide whether or not to escape HTML. It is set to true by default. The only method in Rose::HTML::Object that references it is html_error. All other HTML is escaped as appropriate regardless of the escape_html setting (e.g. the text returned by html_attrs_string always has its attribute values escaped). Subclasses may consult this flag for similar purposes (which they must document, of course).
<B>has_child OBJECTB> Returns true if OBJECT is a child of this object, false otherwise.
<B>has_childrenB> Returns true if there are any children, false otherwise.
<B>has_parentB> Returns true if this object is the child of another object, false otherwise.
<B>has_errorB> Returns true if an error is set, false otherwise.
<B>htmlB> A synonym for the html_tag method.
<B>html_attr NAME [, VALUE]B> Get or set the HTML attribute NAME. If just NAME is passed, it returns the value of the HTML attribute specified by NAME, or undef if there is no such attribute.

If both NAME and VALUE are passed, it sets the HTML attribute NAME to VALUE.

If NAME is not a valid attribute, a fatal error is thrown.

Examples:



    $o->html_attr(color => red);   # set color to red
    $color = $o->html_attr(color); # get color



<B>html_attrs [ATTRS]B> If called with an argument, this method sets and/or adds the HTML attributes specified by ATTRS, where ATTRS is a series of name/value pairs or a reference to a hash of name/value pairs.

Returns all of the existing HTML attributes as a hash (in list context) or a reference to a hash (in scalar context).

Note that the reference returned in scalar context is a reference to the object’s actual hash of attributes; modifying it will change the state of the object! I recommend that you treat the contents of the referenced hash as read-only, and I cannot promise that I will not find a way to force it to be read-only in the future.

The order of the attributes in the return value is indeterminate.

Examples:



    # Set/add attributes
    $o->html_attrs(color => red, age => 5); # name/value pairs
    $o->html_attrs({ style => fancy });       # hashref

    %h = $o->html_attrs; # get all three attributes as a hash
    $h = $o->html_attrs; # get all three attributes as a hash ref



<B>html_attrs_stringB> If there are any HTML attributes, it returns a sorted list of HTML attributes and their values in a string suitable for use in an HTML tag. The string includes a leading space.

If there are no HTML attributes, an empty string is returned.

Examples:



    MyTag->add_valid_html_attrs(color, age);
    MyTag->add_boolean_html_attr(happy);

    $o = MyTag->new;

    $o->html_attrs(color => red<, age => 5, happy => 12345);

    $s = $o->html_attrs_string; #  age="5" color="red<" happy



<B>html_attr_hook NAME [, CODE]B> If called with two arguments, it sets the hook method for the attribute NAME to the code reference CODE.

If called with one or two arguments, it returns the hook method for the HTML attribute NAME as a code reference, or undef if there is no hook method.

Hook methods are called whenever their corresponding HTML attribute is set or retrieved. When the attribute is set, the hook method gets the proposed value of the attribute as an argument. The return value of the hook method is then used as the actual value of the attribute.

When an attribute is retrieved, the hook method is called with no arguments, and its return value is what is actually returned to the caller.

In both cases, the default variable $_ is localized and then set to the new or existing value of the attribute before the hook method is called.

Examples:



    # Set hook for color attribute
    $o->html_attr_hook(color => sub
    {
      my($self) = shift;

      if(@_) # attribute is being set
      {
        return uc shift; # make it uppercase
      }

      # attribute being retrieved:
      return $_; # return the existing attribute value as-is
    });

    $o->html_attr(color => red);   # color set to RED
    $color = $o->html_attr(color); # $color = RED



<B>html_element [NAME]B> Get or set the name of the HTML element. The HTML element is the name of the tag, e.g. img, p, a, select, textarea, etc.

This attribute may be read-only in subclasses.

<B>html_errorB> Returns the error text, if any, as a snippet of HTML that looks like this:



    <span class="error">Error text goes here</span>



If the escape_html flag is set to true (the default), then the error text has any HTML in it escaped.

<B>html_tagB> Serializes the object as an HTML tag. In other words, it is the concatenation of the strings returned by the html_element and html_attrs_string methods, wrapped with the appropriate angled brackets.
<B>is_self_closing [BOOL]B> Get or set a boolean attribute that determines whether or not the HTML for this object requires a separate closing tag. If set to true, then an empty foo tag would look like this:



     HTML: <foo>
    XHTML: <foo />



If false, then the tags above would look like this instead:



     HTML: <foo></foo>
    XHTML: <foo></foo>



The default value is false. This attribute may be read-only in subclasses.

<B>locale [LOCALE]B> This method may be called as a class method or an object method.

When called as an object method and a LOCALE is passed, then the locale of this object is set. When called as a class method and a LOCALE is passed, then the default_locale is set.

If no locale is set for this object (when called as an object method), then the the first defined locale from the object’s parent_group, parent_field, parent_form, or generic parent is returned. If none of those locales are defined, then the localizer’s locale is returned, if it is set. Otherwise, the default_locale is returned.

If no locale is set for this class (when called as a class method) then the localizer’s locale is returned, if it is set. Otherwise, the default_locale is returned.

<B>localizer [LOCALIZER]B> Get or set the Rose::HTML::Object::Message::Localizer-derived object used to localize message text on behalf of this object. If no localizer is set then the default_localizer is returned.
<B>message_for_error_id [PARAMS]B> Given an error id, return the corresponding message object. The default implementation simply looks for a message with the same integer id as the error. Valid PARAMS name/value pairs are:
<B>error_id IDB> The integer error id. This parameter is required.
<B>args HASHREFB> A reference to a hash of name/value pairs to be used as the message arguments.
<B>parent [OBJECT]B> Get or set the parent object.
<B>pop_child [INT]B> Remove an object from the end of the list of children and return it.
<B>pop_children [INT]B> Remove INT objects from the end of the list of children and return them. If INT is ommitted, it defaults to 1.
<B>push_child OBJECTB> Add OBJECT to the end of the list of children. The object must be of or derived from the Rose::HTML::Object class, or a plain scalar. If it’s a plain scalar, it will be converted to a Rose::HTML::Text object, with the scalar used as the value of the text attribute.
<B>push_children OBJECT1 [, OBJECT2, ...]B> Add objects on to the end of the list of children. Each object must be of or derived from the Rose::HTML::Object class, or a plain scalar. All plain scalars will be converted to Rose::HTML::Text objects, with the scalar used as the value of the text attribute.
<B>set_errorB> Set the error to a defined but invisible (zero-length) value. This value will not be displayed by the html_error or xhtml_error methods. Use this method when you want to flag a field as having an error, but don’t want a visible error message.
<B>shift_child [INT]B> Remove an object from the start of the list of children and return it.
<B>shift_children [INT]B> Remove INT objects from the start of the list of children and return them. If INT is ommitted, it defaults to 1.
<B>unshift_child OBJECTB> Add OBJECT to the start of the list of children. The object must be of or derived from the Rose::HTML::Object class, or a plain scalar. If it’s a plain scalar, it will be converted to a Rose::HTML::Text object, with the scalar used as the value of the text attribute.
<B>unshift_children OBJECT1 [, OBJECT2, ...]B> Add objects to the start of the list of children. Each object must be of or derived from the Rose::HTML::Object class, or a plain scalar. All plain scalars will be converted to Rose::HTML::Text objects, with the scalar used as the value of the text attribute.
<B>unset_errorB> Set the error to a undef.
<B>validate_html_attrs BOOLB> If set to true, HTML attribute arguments to html_attr and html_attr_hook will be validated by calling html_attr_is_valid(ATTR), where ATTR is the name of the attribute being set or read. The default value is true for any class derived from Rose::HTML::Object, but false for objects whose class is Rose::HTML::Object.
<B>xhtmlB> A synonym for the xhtml_tag method.
<B>xhtml_element [NAME]B> Get or set the name of the XHTML element. The XHTML element is the name of the tag, e.g. img, p, a, select, textarea, etc.

This attribute may be read-only in subclasses.

<B>xhtml_errorB> Returns the error text, if any, as a snippet of XHTML that looks like this:



    <span class="error">Error text goes here</span>



If the escape_html flag is set to true (the default), then the error text has any HTML in it escaped.

<B>xhtml_tagB> Serializes the object as an XHTML tag. In other words, it is the concatenation of the strings returned by the xhtml_element and xhtml_attrs_string methods, wrapped with the appropriate angled brackets and forward slash character.
<B>xhtml_attrs_stringB> If there are any HTML attributes, it returns a sorted list of HTML attributes and their values in a string suitable for use in an XHTML tag. The string includes a leading space.

If there are no HTML attributes, an empty string is returned.

Examples:



    MyTag->add_valid_html_attrs(color, age);
    MyTag->add_boolean_html_attr(happy);

    $o = MyTag->new;

    $o->html_attrs(color => red<, age => 5, happy => 12345);

    #  age="5" color="red<" happy="happy"
    $s = $o->xhtml_attrs_string;



SUPPORT

Any Rose::HTML::Objects questions or problems can be posted to the Rose::HTML::Objects mailing list. To subscribe to the list or search the archives, go here:

<http://groups.google.com/group/rose-html-objects>

Although the mailing list is the preferred support mechanism, you can also email the author (see below) or file bugs using the CPAN bug tracking system:

<http://rt.cpan.org/NoAuth/Bugs.html?Dist=Rose-HTML-Objects>

There’s also a wiki and other resources linked from the Rose project home page:

<http://rosecode.org>

AUTHOR

John C. Siracusa (siracusa@gmail.com)

LICENSE

Copyright (c) 2010 by John C. Siracusa. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
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