| Module | ActionView::Helpers::PrototypeHelper::JavaScriptGenerator::GeneratorMethods |
| In: |
lib/action_view/helpers/prototype_helper.rb
|
JavaScriptGenerator generates blocks of JavaScript code that allow you to change the content and presentation of multiple DOM elements. Use this in your Ajax response bodies, either in a <script> tag or as plain JavaScript sent with a Content-type of "text/javascript".
Create new instances with PrototypeHelper#update_page or with ActionController::Base#render, then call insert_html, replace_html, remove, show, hide, visual_effect, or any other of the built-in methods on the yielded generator in any order you like to modify the content and appearance of the current page.
Example:
# Generates:
# new Insertion.Bottom("list", "<li>Some item</li>");
# new Effect.Highlight("list");
# ["status-indicator", "cancel-link"].each(Element.hide);
update_page do |page|
page.insert_html :bottom, 'list', "<li>#{@item.name}</li>"
page.visual_effect :highlight, 'list'
page.hide 'status-indicator', 'cancel-link'
end
Helper methods can be used in conjunction with JavaScriptGenerator. When a helper method is called inside an update block on the page object, that method will also have access to a page object.
Example:
module ApplicationHelper
def update_time
page.replace_html 'time', Time.now.to_s(:db)
page.visual_effect :highlight, 'time'
end
end
# Controller action
def poll
render(:update) { |page| page.update_time }
end
Calls to JavaScriptGenerator not matching a helper method below generate a proxy to the JavaScript Class named by the method called.
Examples:
# Generates:
# Foo.init();
update_page do |page|
page.foo.init
end
# Generates:
# Event.observe('one', 'click', function () {
# $('two').show();
# });
update_page do |page|
page.event.observe('one', 'click') do |p|
p[:two].show
end
end
You can also use PrototypeHelper#update_page_tag instead of PrototypeHelper#update_page to wrap the generated JavaScript in a <script> tag.
Returns a element reference by finding it through id in the DOM. This element can then be used for further method calls. Examples:
page['blank_slate'] # => $('blank_slate');
page['blank_slate'].show # => $('blank_slate').show();
page['blank_slate'].show('first').up # => $('blank_slate').show('first').up();
You can also pass in a record, which will use ActionController::RecordIdentifier.dom_id to lookup the correct id:
page[@post] # => $('post_45')
page[Post.new] # => $('new_post')
Displays an alert dialog with the given message.
Example:
# Generates: alert('This message is from Rails!')
page.alert('This message is from Rails!')
Assigns the JavaScript variable the given value.
Examples:
# Generates: my_string = "This is mine!"; page.assign 'my_string', 'This is mine!' # Generates: record_count = 33; page.assign 'record_count', 33 # Generates: tabulated_total = 47 page.assign 'tabulated_total', @total_from_cart
Calls the JavaScript function, optionally with the given arguments.
If a block is given, the block will be passed to a new JavaScriptGenerator; the resulting JavaScript code will then be wrapped inside function() { … } and passed as the called function‘s final argument.
Examples:
# Generates: Element.replace(my_element, "My content to replace with.")
page.call 'Element.replace', 'my_element', "My content to replace with."
# Generates: alert('My message!')
page.call 'alert', 'My message!'
# Generates:
# my_method(function() {
# $("one").show();
# $("two").hide();
# });
page.call(:my_method) do |p|
p[:one].show
p[:two].hide
end
Executes the content of the block after a delay of seconds. Example:
# Generates:
# setTimeout(function() {
# ;
# new Effect.Fade("notice",{});
# }, 20000);
page.delay(20) do
page.visual_effect :fade, 'notice'
end
Creates a script.aculo.us draggable element. See ActionView::Helpers::ScriptaculousHelper for more information.
Creates a script.aculo.us drop receiving element. See ActionView::Helpers::ScriptaculousHelper for more information.
Hides the visible DOM elements with the given ids.
Example:
# Hide a few people # Generates: ["person_29", "person_9", "person_0"].each(Element.hide); page.hide 'person_29', 'person_9', 'person_0'
Inserts HTML at the specified position relative to the DOM element identified by the given id.
position may be one of:
| :top: | HTML is inserted inside the element, before the element‘s existing content. |
| :bottom: | HTML is inserted inside the element, after the element‘s existing content. |
| :before: | HTML is inserted immediately preceding the element. |
| :after: | HTML is inserted immediately following the element. |
options_for_render may be either a string of HTML to insert, or a hash of options to be passed to ActionView::Base#render. For example:
# Insert the rendered 'navigation' partial just before the DOM
# element with ID 'content'.
# Generates: new Insertion.Before("content", "-- Contents of 'navigation' partial --");
page.insert_html :before, 'content', :partial => 'navigation'
# Add a list item to the bottom of the <ul> with ID 'list'.
# Generates: new Insertion.Bottom("list", "<li>Last item</li>");
page.insert_html :bottom, 'list', '<li>Last item</li>'
Returns an object whose to_json evaluates to code. Use this to pass a literal JavaScript expression as an argument to another JavaScriptGenerator method.
Redirects the browser to the given location using JavaScript, in the same form as url_for.
Examples:
# Generates: window.location.href = "/mycontroller"; page.redirect_to(:action => 'index') # Generates: window.location.href = "/account/signup"; page.redirect_to(:controller => 'account', :action => 'signup')
Removes the DOM elements with the given ids from the page.
Example:
# Remove a few people # Generates: ["person_23", "person_9", "person_2"].each(Element.remove); page.remove 'person_23', 'person_9', 'person_2'
Replaces the "outer HTML" (i.e., the entire element, not just its contents) of the DOM element with the given id.
options_for_render may be either a string of HTML to insert, or a hash of options to be passed to ActionView::Base#render. For example:
# Replace the DOM element having ID 'person-45' with the # 'person' partial for the appropriate object. page.replace 'person-45', :partial => 'person', :object => @person
This allows the same partial that is used for the insert_html to be also used for the input to replace without resorting to the use of wrapper elements.
Examples:
<div id="people">
<%= render :partial => 'person', :collection => @people %>
</div>
# Insert a new person
#
# Generates: new Insertion.Bottom({object: "Matz", partial: "person"}, "");
page.insert_html :bottom, :partial => 'person', :object => @person
# Replace an existing person
# Generates: Element.replace("person_45", "-- Contents of partial --");
page.replace 'person_45', :partial => 'person', :object => @person
Replaces the inner HTML of the DOM element with the given id.
options_for_render may be either a string of HTML to insert, or a hash of options to be passed to ActionView::Base#render. For example:
# Replace the HTML of the DOM element having ID 'person-45' with the
# 'person' partial for the appropriate object.
# Generates: Element.update("person-45", "-- Contents of 'person' partial --");
page.replace_html 'person-45', :partial => 'person', :object => @person
Returns a collection reference by finding it through a CSS pattern in the DOM. This collection can then be used for further method calls. Examples:
page.select('p') # => $$('p');
page.select('p.welcome b').first # => $$('p.welcome b').first();
page.select('p.welcome b').first.hide # => $$('p.welcome b').first().hide();
You can also use prototype enumerations with the collection. Observe:
# Generates: $$('#items li').each(function(value) { value.hide(); });
page.select('#items li').each do |value|
value.hide
end
Though you can call the block param anything you want, they are always rendered in the javascript as ‘value, index.’ Other enumerations, like collect() return the last statement:
# Generates: var hidden = $$('#items li').collect(function(value, index) { return value.hide(); });
page.select('#items li').collect('hidden') do |item|
item.hide
end
Shows hidden DOM elements with the given ids.
Example:
# Show a few people # Generates: ["person_6", "person_13", "person_223"].each(Element.show); page.show 'person_6', 'person_13', 'person_223'
Creates a script.aculo.us sortable element. Useful to recreate sortable elements after items get added or deleted. See ActionView::Helpers::ScriptaculousHelper for more information.
Toggles the visibility of the DOM elements with the given ids. Example:
# Show a few people # Generates: ["person_14", "person_12", "person_23"].each(Element.toggle); page.toggle 'person_14', 'person_12', 'person_23' # Hides the elements page.toggle 'person_14', 'person_12', 'person_23' # Shows the previously hidden elements
Starts a script.aculo.us visual effect. See ActionView::Helpers::ScriptaculousHelper for more information.