X-Git-Url: https://git.njae.me.uk/?a=blobdiff_plain;f=vendor%2Frails%2Factionpack%2Flib%2Faction_view%2Fhelpers%2Fprototype_helper.rb;fp=vendor%2Frails%2Factionpack%2Flib%2Faction_view%2Fhelpers%2Fprototype_helper.rb;h=91ef72e54b053bb585f634b48dcf821a8f192602;hb=437aa336c44c74a30aeea16a06743c32747ed661;hp=0000000000000000000000000000000000000000;hpb=97a0772b06264134cfe38e7494f9427efe0840a0;p=feedcatcher.git diff --git a/vendor/rails/actionpack/lib/action_view/helpers/prototype_helper.rb b/vendor/rails/actionpack/lib/action_view/helpers/prototype_helper.rb new file mode 100644 index 0000000..91ef72e --- /dev/null +++ b/vendor/rails/actionpack/lib/action_view/helpers/prototype_helper.rb @@ -0,0 +1,1305 @@ +require 'set' +require 'active_support/json' + +module ActionView + module Helpers + # Prototype[http://www.prototypejs.org/] is a JavaScript library that provides + # DOM[http://en.wikipedia.org/wiki/Document_Object_Model] manipulation, + # Ajax[http://www.adaptivepath.com/publications/essays/archives/000385.php] + # functionality, and more traditional object-oriented facilities for JavaScript. + # This module provides a set of helpers to make it more convenient to call + # functions from Prototype using Rails, including functionality to call remote + # Rails methods (that is, making a background request to a Rails action) using Ajax. + # This means that you can call actions in your controllers without + # reloading the page, but still update certain parts of it using + # injections into the DOM. A common use case is having a form that adds + # a new element to a list without reloading the page or updating a shopping + # cart total when a new item is added. + # + # == Usage + # To be able to use these helpers, you must first include the Prototype + # JavaScript framework in your pages. + # + # javascript_include_tag 'prototype' + # + # (See the documentation for + # ActionView::Helpers::JavaScriptHelper for more information on including + # this and other JavaScript files in your Rails templates.) + # + # Now you're ready to call a remote action either through a link... + # + # link_to_remote "Add to cart", + # :url => { :action => "add", :id => product.id }, + # :update => { :success => "cart", :failure => "error" } + # + # ...through a form... + # + # <% form_remote_tag :url => '/shipping' do -%> + #
<%= submit_tag 'Recalculate Shipping' %>
+ # <% end -%> + # + # ...periodically... + # + # periodically_call_remote(:url => 'update', :frequency => '5', :update => 'ticker') + # + # ...or through an observer (i.e., a form or field that is observed and calls a remote + # action when changed). + # + # <%= observe_field(:searchbox, + # :url => { :action => :live_search }), + # :frequency => 0.5, + # :update => :hits, + # :with => 'query' + # %> + # + # As you can see, there are numerous ways to use Prototype's Ajax functions (and actually more than + # are listed here); check out the documentation for each method to find out more about its usage and options. + # + # === Common Options + # See link_to_remote for documentation of options common to all Ajax + # helpers; any of the options specified by link_to_remote can be used + # by the other helpers. + # + # == Designing your Rails actions for Ajax + # When building your action handlers (that is, the Rails actions that receive your background requests), it's + # important to remember a few things. First, whatever your action would normally return to the browser, it will + # return to the Ajax call. As such, you typically don't want to render with a layout. This call will cause + # the layout to be transmitted back to your page, and, if you have a full HTML/CSS, will likely mess a lot of things up. + # You can turn the layout off on particular actions by doing the following: + # + # class SiteController < ActionController::Base + # layout "standard", :except => [:ajax_method, :more_ajax, :another_ajax] + # end + # + # Optionally, you could do this in the method you wish to lack a layout: + # + # render :layout => false + # + # You can tell the type of request from within your action using the request.xhr? (XmlHttpRequest, the + # method that Ajax uses to make background requests) method. + # def name + # # Is this an XmlHttpRequest request? + # if (request.xhr?) + # render :text => @name.to_s + # else + # # No? Then render an action. + # render :action => 'view_attribute', :attr => @name + # end + # end + # + # The else clause can be left off and the current action will render with full layout and template. An extension + # to this solution was posted to Ryan Heneise's blog at ArtOfMission["http://www.artofmission.com/"]. + # + # layout proc{ |c| c.request.xhr? ? false : "application" } + # + # Dropping this in your ApplicationController turns the layout off for every request that is an "xhr" request. + # + # If you are just returning a little data or don't want to build a template for your output, you may opt to simply + # render text output, like this: + # + # render :text => 'Return this from my method!' + # + # Since whatever the method returns is injected into the DOM, this will simply inject some text (or HTML, if you + # tell it to). This is usually how small updates, such updating a cart total or a file count, are handled. + # + # == Updating multiple elements + # See JavaScriptGenerator for information on updating multiple elements + # on the page in an Ajax response. + module PrototypeHelper + unless const_defined? :CALLBACKS + CALLBACKS = Set.new([ :create, :uninitialized, :loading, :loaded, + :interactive, :complete, :failure, :success ] + + (100..599).to_a) + AJAX_OPTIONS = Set.new([ :before, :after, :condition, :url, + :asynchronous, :method, :insertion, :position, + :form, :with, :update, :script, :type ]).merge(CALLBACKS) + end + + # Returns a link to a remote action defined by options[:url] + # (using the url_for format) 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]. + # Usually, the result would be a partial prepared by the controller with + # render :partial. + # + # Examples: + # # Generates: Delete this post + # link_to_remote "Delete this post", :update => "posts", + # :url => { :action => "destroy", :id => post.id } + # + # # Generates: Refresh + # link_to_remote(image_tag("refresh"), :update => "emails", + # :url => { :action => "list_emails" }) + # + # You can override the generated HTML options by specifying a hash in + # options[:html]. + # + # link_to_remote "Delete this post", :update => "posts", + # :url => post_url(@post), :method => :delete, + # :html => { :class => "destructive" } + # + # You can also specify a hash for options[:update] to allow for + # easy redirection of output to an other DOM element if a server-side + # error occurs: + # + # Example: + # # Generates: Delete this post + # link_to_remote "Delete this post", + # :url => { :action => "destroy", :id => post.id }, + # :update => { :success => "posts", :failure => "error" } + # + # Optionally, you can use the options[:position] parameter to + # influence how the target DOM element is updated. It must be one of + # :before, :top, :bottom, or :after. + # + # The method used is by default POST. You can also specify GET or you + # can simulate PUT or DELETE over POST. All specified with options[:method] + # + # Example: + # # Generates: Destroy + # link_to_remote "Destroy", :url => person_url(:id => person), :method => :delete + # + # By default, these remote requests are processed asynchronous during + # which various JavaScript callbacks can be triggered (for progress + # indicators and the likes). All callbacks get access to the + # request object, which holds the underlying XMLHttpRequest. + # + # To access the server response, use request.responseText, to + # find out the HTTP status, use request.status. + # + # Example: + # # Generates: hello + # word = 'hello' + # link_to_remote word, + # :url => { :action => "undo", :n => word_counter }, + # :complete => "undoRequestCompleted(request)" + # + # The callbacks that may be specified are (in order): + # + # :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. + # :success:: Called when the XMLHttpRequest is completed, + # and the HTTP status code is in the 2XX range. + # :failure:: Called when the XMLHttpRequest is completed, + # and the HTTP status code is not in the 2XX + # range. + # :complete:: Called when the XMLHttpRequest is complete + # (fires after success/failure if they are + # present). + # + # You can further refine :success and :failure by + # adding additional callbacks for specific status codes. + # + # Example: + # # Generates: hello + # link_to_remote word, + # :url => { :action => "action" }, + # 404 => "alert('Not found...? Wrong URL...?')", + # :failure => "alert('HTTP Error ' + request.status + '!')" + # + # A status code callback overrides the success/failure handlers if + # present. + # + # If you for some reason or another need synchronous processing (that'll + # 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. + # :submit:: Specifies the DOM element ID that's used + # as the parent of the form elements. By + # default this is the current form, but + # it could just as well be the ID of a + # table row or any other DOM element. + # :with:: A JavaScript expression specifying + # the parameters for the XMLHttpRequest. + # Any expressions should return a valid + # URL query string. + # + # Example: + # + # :with => "'name=' + $('name').value" + # + # You can generate a link that uses AJAX in the general case, while + # degrading gracefully to plain link behavior in the absence of + # JavaScript by setting html_options[:href] to an alternate URL. + # Note the extra curly braces around the options hash separate + # it as the second parameter from html_options, the third. + # + # Example: + # link_to_remote "Delete this post", + # { :update => "posts", :url => { :action => "destroy", :id => post.id } }, + # :href => url_for(:action => "destroy", :id => post.id) + def link_to_remote(name, options = {}, html_options = nil) + link_to_function(name, remote_function(options), html_options || options.delete(:html)) + end + + # Creates a button with an onclick event which calls a remote action + # via XMLHttpRequest + # The options for specifying the target with :url + # and defining callbacks is the same as link_to_remote. + def button_to_remote(name, options = {}, html_options = {}) + button_to_function(name, remote_function(options), html_options) + end + + # 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. + # Examples: + # # Call get_averages and put its results in 'avg' every 10 seconds + # # Generates: + # # new PeriodicalExecuter(function() {new Ajax.Updater('avg', '/grades/get_averages', + # # {asynchronous:true, evalScripts:true})}, 10) + # periodically_call_remote(:url => { :action => 'get_averages' }, :update => 'avg') + # + # # Call invoice every 10 seconds with the id of the customer + # # If it succeeds, update the invoice DIV; if it fails, update the error DIV + # # Generates: + # # new PeriodicalExecuter(function() {new Ajax.Updater({success:'invoice',failure:'error'}, + # # '/testing/invoice/16', {asynchronous:true, evalScripts:true})}, 10) + # periodically_call_remote(:url => { :action => 'invoice', :id => customer.id }, + # :update => { :success => "invoice", :failure => "error" } + # + # # Call update every 20 seconds and update the new_block DIV + # # Generates: + # # new PeriodicalExecuter(function() {new Ajax.Updater('news_block', 'update', {asynchronous:true, evalScripts:true})}, 20) + # periodically_call_remote(:url => 'update', :frequency => '20', :update => 'news_block') + # + def periodically_call_remote(options = {}) + frequency = options[:frequency] || 10 # every ten seconds by default + code = "new PeriodicalExecuter(function() {#{remote_function(options)}}, #{frequency})" + javascript_tag(code) + end + + # Returns a form tag that will submit using XMLHttpRequest in the + # background instead of the regular reloading POST arrangement. Even + # though it's using JavaScript to serialize the form elements, the form + # submission will work just like a regular submission as viewed by the + # receiving side (all elements available in params). The options for + # specifying the target with :url and defining callbacks is the same as + # +link_to_remote+. + # + # A "fall-through" target for browsers that doesn't do JavaScript can be + # specified with the :action/:method options on :html. + # + # Example: + # # Generates: + # #
+ # form_remote_tag :html => { :action => + # url_for(:controller => "some", :action => "place") } + # + # The Hash passed to the :html key is equivalent to the options (2nd) + # argument in the FormTagHelper.form_tag method. + # + # By default the fall-through action is the same as the one specified in + # the :url (and the default method is :post). + # + # form_remote_tag also takes a block, like form_tag: + # # Generates: + # #
+ # #
+ # <% form_remote_tag :url => '/posts' do -%> + #
<%= submit_tag 'Save' %>
+ # <% end -%> + def form_remote_tag(options = {}, &block) + options[:form] = true + + options[:html] ||= {} + options[:html][:onsubmit] = + (options[:html][:onsubmit] ? options[:html][:onsubmit] + "; " : "") + + "#{remote_function(options)}; return false;" + + form_tag(options[:html].delete(:action) || url_for(options[:url]), options[:html], &block) + end + + # Creates a form that will submit using XMLHttpRequest in the background + # instead of the regular reloading POST arrangement and a scope around a + # specific resource that is used as a base for questioning about + # values for the fields. + # + # === Resource + # + # Example: + # <% remote_form_for(@post) do |f| %> + # ... + # <% end %> + # + # This will expand to be the same as: + # + # <% remote_form_for :post, @post, :url => post_path(@post), :html => { :method => :put, :class => "edit_post", :id => "edit_post_45" } do |f| %> + # ... + # <% end %> + # + # === Nested Resource + # + # Example: + # <% remote_form_for([@post, @comment]) do |f| %> + # ... + # <% end %> + # + # This will expand to be the same as: + # + # <% remote_form_for :comment, @comment, :url => post_comment_path(@post, @comment), :html => { :method => :put, :class => "edit_comment", :id => "edit_comment_45" } do |f| %> + # ... + # <% end %> + # + # If you don't need to attach a form to a resource, then check out form_remote_tag. + # + # See FormHelper#form_for for additional semantics. + def remote_form_for(record_or_name_or_array, *args, &proc) + options = args.extract_options! + + case record_or_name_or_array + when String, Symbol + object_name = record_or_name_or_array + when Array + object = record_or_name_or_array.last + object_name = ActionController::RecordIdentifier.singular_class_name(object) + apply_form_for_options!(record_or_name_or_array, options) + args.unshift object + else + object = record_or_name_or_array + object_name = ActionController::RecordIdentifier.singular_class_name(record_or_name_or_array) + apply_form_for_options!(object, options) + args.unshift object + end + + concat(form_remote_tag(options)) + fields_for(object_name, *(args << options), &proc) + concat('') + end + alias_method :form_remote_for, :remote_form_for + + # Returns a button input tag with the element name of +name+ and a value (i.e., display text) of +value+ + # that will submit form using XMLHttpRequest in the background instead of a regular POST request that + # reloads the page. + # + # # Create a button that submits to the create action + # # + # # Generates: + # <%= submit_to_remote 'create_btn', 'Create', :url => { :action => 'create' } %> + # + # # Submit to the remote action update and update the DIV succeed or fail based + # # on the success or failure of the request + # # + # # Generates: + # <%= submit_to_remote 'update_btn', 'Update', :url => { :action => 'update' }, + # :update => { :success => "succeed", :failure => "fail" } + # + # options argument is the same as in form_remote_tag. + def submit_to_remote(name, value, options = {}) + options[:with] ||= 'Form.serialize(this.form)' + + html_options = options.delete(:html) || {} + html_options[:name] = name + + button_to_remote(value, options, html_options) + end + + # 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. + def evaluate_remote_response + "eval(request.responseText)" + end + + # Returns the JavaScript needed for a remote function. + # Takes the same arguments as link_to_remote. + # + # Example: + # # Generates: { :action => :update_options }) %>"> + # + # + # + def remote_function(options) + javascript_options = options_for_ajax(options) + + update = '' + if options[:update] && options[:update].is_a?(Hash) + update = [] + update << "success:'#{options[:update][:success]}'" if options[:update][:success] + update << "failure:'#{options[:update][:failure]}'" if options[:update][:failure] + update = '{' + update.join(',') + '}' + elsif options[:update] + update << "'#{options[:update]}'" + end + + function = update.empty? ? + "new Ajax.Request(" : + "new Ajax.Updater(#{update}, " + + url_options = options[:url] + url_options = url_options.merge(:escape => false) if url_options.is_a?(Hash) + function << "'#{escape_javascript(url_for(url_options))}'" + function << ", #{javascript_options})" + + function = "#{options[:before]}; #{function}" if options[:before] + function = "#{function}; #{options[:after]}" if options[:after] + function = "if (#{options[:condition]}) { #{function}; }" if options[:condition] + function = "if (confirm('#{escape_javascript(options[:confirm])}')) { #{function}; }" if options[:confirm] + + return function + end + + # Observes the field with the DOM ID specified by +field_id+ and calls a + # callback when its contents have changed. The default callback is an + # Ajax call. By default the value of the observed field is sent as a + # parameter with the Ajax call. + # + # Example: + # # Generates: new Form.Element.Observer('suggest', 0.25, function(element, value) {new Ajax.Updater('suggest', + # # '/testing/find_suggestion', {asynchronous:true, evalScripts:true, parameters:'q=' + value})}) + # <%= observe_field :suggest, :url => { :action => :find_suggestion }, + # :frequency => 0.25, + # :update => :suggest, + # :with => 'q' + # %> + # + # Required +options+ are either of: + # :url:: +url_for+-style options for the action to call + # when the field has changed. + # :function:: Instead of making a remote call to a URL, you + # can specify javascript code to be called instead. + # Note that the value of this option is used as the + # *body* of the javascript function, a function definition + # with parameters named element and value will be generated for you + # for example: + # observe_field("glass", :frequency => 1, :function => "alert('Element changed')") + # will generate: + # new Form.Element.Observer('glass', 1, function(element, value) {alert('Element changed')}) + # The element parameter is the DOM element being observed, and the value is its value at the + # time the observer is triggered. + # + # Additional options are: + # :frequency:: The frequency (in seconds) at which changes to + # this field will be detected. Not setting this + # option at all or to a value equal to or less than + # zero will use event based observation instead of + # time based observation. + # :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. The default is to send the + # key and value of the observed field. Any custom + # expressions should return a valid URL query string. + # The value of the field is stored in the JavaScript + # variable +value+. + # + # Examples + # + # :with => "'my_custom_key=' + value" + # :with => "'person[name]=' + prompt('New name')" + # :with => "Form.Element.serialize('other-field')" + # + # Finally + # :with => 'name' + # is shorthand for + # :with => "'name=' + value" + # This essentially just changes the key of the parameter. + # + # Additionally, you may specify any of the options documented in the + # Common options section at the top of this document. + # + # Example: + # + # # Sends params: {:title => 'Title of the book'} when the book_title input + # # field is changed. + # observe_field 'book_title', + # :url => 'http://example.com/books/edit/1', + # :with => 'title' + # + # + def observe_field(field_id, options = {}) + if options[:frequency] && options[:frequency] > 0 + build_observer('Form.Element.Observer', field_id, options) + else + build_observer('Form.Element.EventObserver', field_id, options) + end + end + + # Observes the form with the DOM ID specified by +form_id+ and calls a + # callback when its contents have changed. The default callback is an + # Ajax call. By default all fields of the observed field are sent as + # parameters with the Ajax call. + # + # The +options+ for +observe_form+ are the same as the options for + # +observe_field+. The JavaScript variable +value+ available to the + # :with option is set to the serialized form by default. + def observe_form(form_id, options = {}) + if options[:frequency] + build_observer('Form.Observer', form_id, options) + else + build_observer('Form.EventObserver', form_id, options) + end + end + + # All the methods were moved to GeneratorMethods so that + # #include_helpers_from_context has nothing to overwrite. + class JavaScriptGenerator #:nodoc: + def initialize(context, &block) #:nodoc: + @context, @lines = context, [] + include_helpers_from_context + @context.with_output_buffer(@lines) do + @context.instance_exec(self, &block) + end + end + + private + def include_helpers_from_context + extend @context.helpers if @context.respond_to?(:helpers) + extend GeneratorMethods + end + + # 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