diff options
Diffstat (limited to 'actionpack/lib/action_view/helpers/prototype_helper.rb')
| -rw-r--r-- | actionpack/lib/action_view/helpers/prototype_helper.rb | 449 |
1 files changed, 446 insertions, 3 deletions
diff --git a/actionpack/lib/action_view/helpers/prototype_helper.rb b/actionpack/lib/action_view/helpers/prototype_helper.rb index d861810f19..bef93dd0f8 100644 --- a/actionpack/lib/action_view/helpers/prototype_helper.rb +++ b/actionpack/lib/action_view/helpers/prototype_helper.rb @@ -1,7 +1,6 @@ require 'set' require 'active_support/json' require 'active_support/core_ext/object/returning' -require 'action_view/helpers/scriptaculous_helper' module ActionView module Helpers @@ -28,6 +27,40 @@ module ActionView # 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 -%> + # <div><%= submit_tag 'Recalculate Shipping' %></div> + # <% 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 @@ -74,8 +107,6 @@ module ActionView # See JavaScriptGenerator for information on updating multiple elements # on the page in an Ajax response. module PrototypeHelper - include ScriptaculousHelper - unless const_defined? :CALLBACKS CALLBACKS = Set.new([ :create, :uninitialized, :loading, :loaded, :interactive, :complete, :failure, :success ] + @@ -85,6 +116,325 @@ module ActionView :form, :with, :update, :script, :type ]).merge(CALLBACKS) end + # Returns a link to a remote action defined by <tt>options[:url]</tt> + # (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 <tt>options[:update]</tt>. + # Usually, the result would be a partial prepared by the controller with + # render :partial. + # + # Examples: + # # Generates: <a href="#" onclick="new Ajax.Updater('posts', '/blog/destroy/3', {asynchronous:true, evalScripts:true}); + # # return false;">Delete this post</a> + # link_to_remote "Delete this post", :update => "posts", + # :url => { :action => "destroy", :id => post.id } + # + # # Generates: <a href="#" onclick="new Ajax.Updater('emails', '/mail/list_emails', {asynchronous:true, evalScripts:true}); + # # return false;"><img alt="Refresh" src="/images/refresh.png?" /></a> + # link_to_remote(image_tag("refresh"), :update => "emails", + # :url => { :action => "list_emails" }) + # + # You can override the generated HTML options by specifying a hash in + # <tt>options[:html]</tt>. + # + # link_to_remote "Delete this post", :update => "posts", + # :url => post_url(@post), :method => :delete, + # :html => { :class => "destructive" } + # + # You can also specify a hash for <tt>options[:update]</tt> to allow for + # easy redirection of output to an other DOM element if a server-side + # error occurs: + # + # Example: + # # Generates: <a href="#" onclick="new Ajax.Updater({success:'posts',failure:'error'}, '/blog/destroy/5', + # # {asynchronous:true, evalScripts:true}); return false;">Delete this post</a> + # link_to_remote "Delete this post", + # :url => { :action => "destroy", :id => post.id }, + # :update => { :success => "posts", :failure => "error" } + # + # Optionally, you can use the <tt>options[:position]</tt> parameter to + # influence how the target DOM element is updated. It must be one of + # <tt>:before</tt>, <tt>:top</tt>, <tt>:bottom</tt>, or <tt>:after</tt>. + # + # The method used is by default POST. You can also specify GET or you + # can simulate PUT or DELETE over POST. All specified with <tt>options[:method]</tt> + # + # Example: + # # Generates: <a href="#" onclick="new Ajax.Request('/person/4', {asynchronous:true, evalScripts:true, method:'delete'}); + # # return false;">Destroy</a> + # 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 + # <tt>request</tt> object, which holds the underlying XMLHttpRequest. + # + # To access the server response, use <tt>request.responseText</tt>, to + # find out the HTTP status, use <tt>request.status</tt>. + # + # Example: + # # Generates: <a href="#" onclick="new Ajax.Request('/words/undo?n=33', {asynchronous:true, evalScripts:true, + # # onComplete:function(request){undoRequestCompleted(request)}}); return false;">hello</a> + # word = 'hello' + # link_to_remote word, + # :url => { :action => "undo", :n => word_counter }, + # :complete => "undoRequestCompleted(request)" + # + # The callbacks that may be specified are (in order): + # + # <tt>:loading</tt>:: Called when the remote document is being + # loaded with data by the browser. + # <tt>:loaded</tt>:: Called when the browser has finished loading + # the remote document. + # <tt>:interactive</tt>:: Called when the user can interact with the + # remote document, even though it has not + # finished loading. + # <tt>:success</tt>:: Called when the XMLHttpRequest is completed, + # and the HTTP status code is in the 2XX range. + # <tt>:failure</tt>:: Called when the XMLHttpRequest is completed, + # and the HTTP status code is not in the 2XX + # range. + # <tt>:complete</tt>:: Called when the XMLHttpRequest is complete + # (fires after success/failure if they are + # present). + # + # You can further refine <tt>:success</tt> and <tt>:failure</tt> by + # adding additional callbacks for specific status codes. + # + # Example: + # # Generates: <a href="#" onclick="new Ajax.Request('/testing/action', {asynchronous:true, evalScripts:true, + # # on404:function(request){alert('Not found...? Wrong URL...?')}, + # # onFailure:function(request){alert('HTTP Error ' + request.status + '!')}}); return false;">hello</a> + # 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 + # <tt>options[:type] = :synchronous</tt>. + # + # 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: + # + # <tt>:confirm</tt>:: Adds confirmation dialog. + # <tt>:condition</tt>:: Perform remote request conditionally + # by this expression. Use this to + # describe browser-side conditions when + # request should not be initiated. + # <tt>:before</tt>:: Called before request is initiated. + # <tt>:after</tt>:: Called immediately after request was + # initiated and before <tt>:loading</tt>. + # <tt>:submit</tt>:: 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. + # <tt>:with</tt>:: 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 <tt>html_options[:href]</tt> to an alternate URL. + # Note the extra curly braces around the <tt>options</tt> hash separate + # it as the second parameter from <tt>html_options</tt>, 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 (<tt>options[:url]</tt>) every + # <tt>options[:frequency]</tt> seconds (default is 10). Usually used to + # update a specified div (<tt>options[:update]</tt>) with the results + # of the remote call. The options for specifying the target with <tt>:url</tt> + # 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 <tt>params</tt>). The options for + # specifying the target with <tt>:url</tt> 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 <tt>:action</tt>/<tt>:method</tt> options on <tt>:html</tt>. + # + # Example: + # # Generates: + # # <form action="/some/place" method="post" onsubmit="new Ajax.Request('', + # # {asynchronous:true, evalScripts:true, parameters:Form.serialize(this)}); return false;"> + # form_remote_tag :html => { :action => + # url_for(:controller => "some", :action => "place") } + # + # The Hash passed to the <tt>:html</tt> 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 <tt>:url</tt> (and the default method is <tt>:post</tt>). + # + # form_remote_tag also takes a block, like form_tag: + # # Generates: + # # <form action="/" method="post" onsubmit="new Ajax.Request('/', + # # {asynchronous:true, evalScripts:true, parameters:Form.serialize(this)}); + # # return false;"> <div><input name="commit" type="submit" value="Save" /></div> + # # </form> + # <% form_remote_tag :url => '/posts' do -%> + # <div><%= submit_tag 'Save' %></div> + # <% 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('</form>'.html_safe!) + 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: <input name="create_btn" onclick="new Ajax.Request('/testing/create', + # # {asynchronous:true, evalScripts:true, parameters:Form.serialize(this.form)}); + # # return false;" type="button" value="Create" /> + # <%= 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: <input name="update_btn" onclick="new Ajax.Updater({success:'succeed',failure:'fail'}, + # # '/testing/update', {asynchronous:true, evalScripts:true, parameters:Form.serialize(this.form)}); + # # return false;" type="button" value="Update" /> + # <%= submit_to_remote 'update_btn', 'Update', :url => { :action => 'update' }, + # :update => { :success => "succeed", :failure => "fail" } + # + # <tt>options</tt> 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 '<tt>eval(request.responseText)</tt>' which is the JavaScript function + # that +form_remote_tag+ can call in <tt>:complete</tt> 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. # @@ -126,6 +476,99 @@ module ActionView 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: + # <tt>:url</tt>:: +url_for+-style options for the action to call + # when the field has changed. + # <tt>:function</tt>:: 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: + # <tt>:frequency</tt>:: 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. + # <tt>:update</tt>:: Specifies the DOM ID of the element whose + # innerHTML should be updated with the + # XMLHttpRequest response text. + # <tt>:with</tt>:: 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 + # <em>Common options</em> 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 + # <tt>:with</tt> 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: |