Provided by: libhtml-prototype-perl_1.48-5_all 
NAME
HTML::Prototype - Generate HTML and Javascript for the Prototype library
SYNOPSIS
use HTML::Prototype;
my $prototype = HTML::Prototype->new;
print $prototype->auto_complete_field(...);
print $prototype->auto_complete_result(...);
print $prototype->auto_complete_stylesheet(...);
print $prototype->content_tag(...);
print $prototype->define_javascript_functions;
print $prototype->draggable_element(...);
print $prototype->drop_receiving_element(...);
print $prototype->evaluate_remote_response(...);
print $prototype->form_remote_tag(...);
print $prototype->in_place_editor(...);
print $prototype->in_place_editor_field(...);
print $prototype->in_place_editor_stylesheet(...);
print $prototype->javascript_tag(...);
print $prototype->link_to_function(...);
print $prototype->link_to_remote(...);
print $prototype->observe_field(...);
print $prototype->observe_form(...);
print $prototype->periodically_call_remote(...);
print $prototype->sortable_element(...);
print $prototype->submit_to_remote(...);
print $prototype->tag(...);
print $prototype->text_field_with_auto_complete(...);
print $prototype->update_element_function(...);
print $prototype->visual_effect(...);
DESCRIPTION
The module contains some code generators for Prototype, the famous JavaScript OO library
and the script.aculous extensions.
The Prototype library (http://prototype.conio.net/) is designed to make AJAX easy.
Catalyst::Plugin::Prototype makes it easy to connect to the Prototype library.
This is mostly a port of the Ruby on Rails helper tags for JavaScript for use in Catalyst.
METHODS
$prototype->in_place_editor( $field_id, \%options )
Makes an HTML element specified by the DOM ID $field_id become an in-place editor of a
property.
A form is automatically created and displayed when the user clicks the element,
something like this:
<form id="myElement-in-place-edit-form" target="specified url">
<input name="value" text="The content of myElement"/>
<input type="submit" value="ok"/>
<a onClick="javascript to cancel the editing">cancel</a>
</form>
The form is serialized and sent to the server using an Ajax call, the action on the
server should process the value and return the updated value in the body of the
reponse. The element will automatically be updated with the changed value (as returned
from the server).
Required options are:
"url": Specifies the url where the updated value should be sent after the user presses
"ok".
Addtional options are:
"rows": Number of rows (more than 1 will use a TEXTAREA)
"cols": The number of columns the text area should span (works for both single line or
multi line).
"size": Synonym for XcolsX when using single-line (rows=1) input
"cancel_text": The text on the cancel link. (default: "cancel")
"form_class_name": CSS class used for the in place edit form. (default:
"inplaceeditor-form")
"save_text": The text on the save link. (default: "ok")
"saving_class_name": CSS class added to the element while displaying "Saving..."
(removed when server responds). (default: "inplaceeditor-saving")
"load_text_url": Will cause the text to be loaded from the server (useful if your text
is actually textile and formatted on the server)
"loading_text": If the "load_text_url" option is specified then this text is displayed
while the text is being loaded from the server. (default: "Loading...")
"click_to_edit_text": The text on the click-to-edit link. (default: "click to edit")
"external_control": The id of an external control used to enter edit mode.
"ajax_options": Pass through options to the AJAX call (see prototype's Ajax.Updater)
"with": JavaScript snippet that should return what is to be sent in the Ajax call,
"form" and "value" are implicit parameters
$prototype->in_place_editor_field( $object, $method, \%tag_options,
\%in_place_editor_options )
Renders the value of the specified object and method with in-place editing
capabilities.
$prototype->in_place_editor_stylesheet
Returns the in_place_editor stylesheet.
$prototype->auto_complete_field( $field_id, \%options )
Adds Ajax autocomplete functionality to the text input field with the DOM ID specified
by $field_id.
This function expects that the called action returns a HTML <ul> list, or nothing if
no entries should be displayed for autocompletion.
Required options are:
"url": Specifies the URL to be used in the AJAX call.
Addtional options are:
"update": Specifies the DOM ID of the element whose innerHTML should be updated with
the autocomplete entries returned by the Ajax request. Defaults to field_id +
'_auto_complete'.
"with": A Javascript expression specifying the parameters for the XMLHttpRequest.
This defaults to 'value', which in the evaluated context refers to the new field
value.
"indicator": Specifies the DOM ID of an elment which will be displayed Here's an
example using Catalyst::View::Mason with an indicator against the auto_complete_result
example below on the server side. Notice the 'style="display:none"' in the indicator
<span>.
<% $c->prototype->define_javascript_functions %>
<form action="/bar" method="post" id="baz">
<fieldset>
<legend>Type search terms</legend>
<label for="acomp"><span class="field">Search:</span></label>
<input type="text" name="acomp" id="acomp"/>
<span style="display:none" id="acomp_stat">Searching...</span><br />
</fieldset>
</form>
<span id="acomp_auto_complete"></span><br/>
<% $c->prototype->auto_complete_field( 'acomp', { url => '/autocomplete', indicator => 'acomp_stat' } ) %>
while autocomplete is running.
"tokens": A string or an array of strings containing separator tokens for tokenized
incremental autocompletion. Example: "<tokens =" ','>> would allow multiple
autocompletion entries, separated by commas.
"min_chars": The minimum number of characters that should be in the input field before
an Ajax call is made to the server.
"on_hide": A Javascript expression that is called when the autocompletion div is
hidden. The expression should take two variables: element and update. Element is a
DOM element for the field, update is a DOM element for the div from which the
innerHTML is replaced.
"on_show": Like on_hide, only now the expression is called then the div is shown.
"select": Pick the class of the element from which the value for insertion should be
extracted. If this is not specified, the entire element is used
$prototype->auto_complete_result(\@items, $fieldname, [$phrase])
Returns a list, to communcate with the Autocompleter.
Here's an example for Catalyst:
sub autocomplete : Global {
my ( $self, $c ) = @_;
my @items = qw/foo bar baz/;
$c->res->body( $c->prototype->auto_complete_result(\@items) );
}
$prototype->text_field_with_auto_complete($method, [\%tag_options],
[\%completion_options])
Wrapper for text_field with added Ajax autocompletion functionality.
In your controller, you'll need to define an action called
auto_complete_for_object_method to respond the AJAX calls,
$prototype->auto_complete_stylesheet
Returns the auto_complete stylesheet.
$prototype->content_tag( $name, $content, \%html_options )
Returns a block with opening tag, content, and ending tag. Useful for autogenerating
tags like <a href="http://catalyst.perl.org"Catalyst Homepage</a>>. The first
parameter is the tag name, i.e. 'a' or 'img'.
$prototype->text_field( $name, $method, $html_options )
Returns an input tag of the "text" type tailored for accessing a specified attribute
(identified by $method) on an object assigned to the template (identified by $object).
Additional options on the input tag can be passed as a hash ref with $html_options.
$prototype->define_javascript_functions
Returns the library of JavaScript functions and objects, in a script block.
Notes for Catalyst users:
You can use "script/myapp_create.pl Prototype" to generate a static JavaScript file
which then can be included via remote "script" tag.
$prototype->draggable_element( $element_id, \%options )
Makes the element with the DOM ID specified by "element_id" draggable.
Example:
$prototype->draggable_element( 'my_image', { revert => 'true' } );
The available options are:
handle
Default: none. Sets whether the element should only be draggable by an embedded
handle. The value is a string referencing a CSS class. The first
child/grandchild/etc. element found within the element that has this CSS class
will be used as the handle.
revert
Default: false. If set to true, the element returns to its original position when
the drags ends.
constraint
Default: none. If set to 'horizontal' or 'vertical' the drag will be constrained
to take place only horizontally or vertically.
change
Javascript callback function called whenever the Draggable is moved by dragging.
It should be a string whose contents is a valid JavaScript function definition.
The called function gets the Draggable instance as its parameter. It might look
something like this:
'function (element) { // do something with dragged element }'
See http://script.aculo.us for more documentation.
$prototype->drop_receiving_element( $element_id, \%options )
Makes the element with the DOM ID specified by "element_id" receive dropped draggable
elements (created by draggable_element).
And make an AJAX call.
By default, the action called gets the DOM ID of the element as parameter.
Example:
$prototype->drop_receiving_element(
'my_cart', { url => 'http://foo.bar/add' } );
Required options are:
url The URL for the AJAX call.
Additional options are:
accept
Default: none. Set accept to a string or an array of strings describing CSS
classes. The Droppable will only accept Draggables that have one or more of these
CSS classes.
containment
Default: none. The droppable will only accept the Draggable if the Draggable is
contained in the given elements (or element ids). Can be a single element or an
array of elements. This is option is used by Sortables to control Drag-and-Drop
between Sortables.
overlap
Default: none. If set to 'horizontal' or 'vertical' the droppable will only react
to a Draggable if it overlaps by more than 50% in the given direction. Used by
Sortables.
Additionally, the following JavaScript callback functions can be used in the
option parameter:
onHover
Javascript function called whenever a Draggable is moved over the Droppable and
the Droppable is affected (would accept it). The callback gets three parameters:
the Draggable, the Droppable element, and the percentage of overlapping as defined
by the overlap option. Used by Sortables. The function might look something like
this:
'function (draggable, droppable, pcnt) { // do something }'
See http://script.aculo.us for more documentation.
$prototype->evaluate_remote_response
Returns 'eval(request.responseText)' which is the Javascript function that
form_remote_tag can call in :complete to evaluate a multiple update return document
using update_element_function calls.
$prototype->form_remote_tag(\%options)
Returns a form tag that will submit in the background using XMLHttpRequest, instead of
the regular reloading POST arrangement.
Even though it is using JavaScript to serialize the form elements, the form submission
will work just like a regular submission as viewed by the receiving side.
The options for specifying the target with "url" and defining callbacks are the same
as "link_to_remote".
$prototype->javascript_tag( $content, \%html_options )
Returns a javascript block with opening tag, content and ending tag.
$prototype->link_to_function( $name, $function, \%html_options )
Returns a link that will trigger a JavaScript function using the onClick handler and
return false after the fact.
Examples:
$prototype->link_to_function( "Greeting", "alert('Hello world!') )
$prototype->link_to_function( '<img src="really.png"/>', 'do_delete()', { entities => '' } )
$prototype->link_to_remote( $content, \%options, \%html_options )
Returns a link to a remote action defined by options "url" that's called in the
background using XMLHttpRequest.
The result of that request can then be inserted into a DOM object whose id can be
specified with options->{update}.
Examples:
$prototype->link_to_remote( 'Delete', {
update => 'posts',
url => 'http://localhost/posts/'
} )
$prototype->link_to_remote( '<img src="refresh.png"/>', {
update => 'emails',
url => 'http://localhost/refresh/'
} )
By default, these remote requests are processed asynchronously, during which various
callbacks can be triggered (e.g. for progress indicators and the like).
Example:
$prototype->link_to_remote( 'count', {
url => 'http://localhost/count/',
complete => 'doStuff(request)'
} )
The callbacks that may be specified are:
"loading": Called when the remote document is being loaded with data by the browser.
"loaded": Called when the browser has finished loading the remote document.
"interactive": Called when the user can interact with the remote document, even though
it has not finished loading.
"complete": Called when the XMLHttpRequest is complete.
If you do need synchronous processing (this will block the browser while the request
is happening), you can specify $options->{type} = 'synchronous'.
You can customize further browser side call logic by passing in Javascript code
snippets via some optional parameters. In their order of use these are:
"confirm": Adds confirmation dialog.
"condition": Perform remote request conditionally by this expression. Use this to
describe browser-side conditions when request should not be initiated.
"before": Called before request is initiated.
"after": Called immediately after request was initiated and before "loading".
$prototype->observe_field( $id, \%options)
Observes the field with the DOM ID specified by $id and makes an Ajax when its
contents have changed.
Required options are:
"frequency": The frequency (in seconds) at which changes to this field will be
detected.
"url": url to be called when field content has changed.
Additional options are:
"update": Specifies the DOM ID of the element whose innerHTML should be updated with
the XMLHttpRequest response text.
"with": A JavaScript expression specifying the parameters for the XMLHttpRequest.
This defaults to value, which in the evaluated context refers to the new field value.
Additionally, you may specify any of the options documented in "link_to_remote".
Example TT2 template in Catalyst:
[% c.prototype.define_javascript_functions %]
<h1>[% page.title %]</h1>
<div id="view"></div>
<textarea id="editor" rows="24" cols="80">[% page.body %]</textarea>
[% url = base _ 'edit/' _ page.title %]
[% c.prototype.observe_field( 'editor', {
url => url,
with => "'body='+value",
update => 'view'
} ) %]
$prototype->observe_form( $id, \%options )
Like "observe_field", but operates on an entire form identified by the DOM ID $id.
Options are the same as "observe_field", except the default value of the "with" option
evaluates to the serialized (request string) value of the form.
$prototype->periodically_call_remote( \%options )
Periodically calls the specified url $options->{url} every $options->{frequency}
seconds (default is 10).
Usually used to update a specified div $options->{update} with the results of the
remote call.
The options for specifying the target with "url" and defining callbacks is the same as
"link_to_remote".
$prototype->sortable_element( $element_id, \%options )
Makes the element with the DOM ID specified by $element_id sortable by drag-and-drop
and make an Ajax call whenever the sort order has changed. By default, the action
called gets the serialized sortable element as parameters.
Example:
$prototype->sortable_element( 'my_list', { url => 'http://foo.bar/baz' } );
In the example, the action gets a "my_list" array parameter containing the values of
the ids of elements the sortable consists of, in the current order.
You can change the behaviour with various options, see http://script.aculo.us for more
documentation.
$prototype->submit_to_remote( $name, $value, \%options )
Returns a button input tag that will submit a form using XMLHttpRequest in the
background instead of a typical reloading via POST.
"options" argument is the same as in "form_remote_tag"
$prototype->tag( $name, \%options, $starttag );
Returns a opening tag.
$prototype->update_element_function( $element_id, \%options, \&code )
Returns a Javascript function (or expression) that'll update a DOM element according
to the options passed.
"content": The content to use for updating. Can be left out if using block, see
example.
"action": Valid options are "update" (assumed by default), :empty, :remove
"position": If the :action is :update, you can optionally specify one of the following
positions: :before, :top, :bottom, :after.
Example:
$prototype->javascript_tag( $prototype->update_element_function(
'products', { position => 'bottom', content => '<p>New product!</p>'
) );
This method can also be used in combination with remote method call where the result
is evaluated afterwards to cause multiple updates on a page.
Example:
# View
$prototype->form_remote_tag( {
url => { "http://foo.bar/buy" },
complete => $prototype->evaluate_remote_response
} );
# Returning view
$prototype->update_element_function( 'cart', {
action => 'update',
position => 'bottom',
content => "<p>New Product: $product_name</p>"
} );
$prototype->update_element_function( 'status',
{ binding => "You've bought a new product!" } );
$prototype->visual_effect( $name, $element_id, \%js_options )
Returns a JavaScript snippet to be used on the Ajax callbacks for starting visual
effects.
$prototype->link_to_remote( 'Reload', {
update => 'posts',
url => 'http://foo.bar/baz',
complete => $prototype->visual_effect( 'highlight', 'posts', {
duration => '0.5'
} )
} );
SEE ALSO
Catalyst::Plugin::Prototype, Catalyst. <http://prototype.conio.net/>
AUTHOR
Sascha Kiefer, "esskar@cpan.org" Sebastian Riedel, "sri@oook.de" Marcus Ramberg,
"mramberg@cpan.org"
Built around Prototype by Sam Stephenson. Much code is ported from Ruby on Rails
javascript helpers.
THANK YOU
Drew Taylor, Leon Brocard, Andreas Marienborg
LICENSE
This library is free software. You can redistribute it and/or modify it under the same
terms as perl itself.