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require 'action_view/helpers/tag_helper'
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require 'action_view/helpers/prototype_helper'
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# Provides functionality for working with JavaScript in your views.
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# == Ajax, controls and visual effects
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# * For information on using Ajax, see
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# ActionView::Helpers::PrototypeHelper.
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# * For information on using controls and visual effects, see
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# ActionView::Helpers::ScriptaculousHelper.
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# == Including the JavaScript libraries into your pages
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# Rails includes the Prototype JavaScript framework and the Scriptaculous
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# JavaScript controls and visual effects library. If you wish to use
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# these libraries and their helpers (ActionView::Helpers::PrototypeHelper
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# and ActionView::Helpers::ScriptaculousHelper), you must do one of the
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# * Use <tt><%= javascript_include_tag :defaults %></tt> in the HEAD
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# section of your page (recommended): This function will return
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# references to the JavaScript files created by the +rails+ command in
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# your <tt>public/javascripts</tt> directory. Using it is recommended as
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# the browser can then cache the libraries instead of fetching all the
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# functions anew on every request.
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# * Use <tt><%= javascript_include_tag 'prototype' %></tt>: As above, but
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# will only include the Prototype core library, which means you are able
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# to use all basic AJAX functionality. For the Scriptaculous-based
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# JavaScript helpers, like visual effects, autocompletion, drag and drop
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# and so on, you should use the method described above.
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# For documentation on +javascript_include_tag+ see
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# ActionView::Helpers::AssetTagHelper.
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module JavaScriptHelper
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unless const_defined? :JAVASCRIPT_PATH
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JAVASCRIPT_PATH = File.join(File.dirname(__FILE__), 'javascripts')
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include PrototypeHelper
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# Returns a link of the given +name+ that will trigger a JavaScript +function+ using the
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# onclick handler and return false after the fact.
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# The first argument +name+ is used as the link text.
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# The next arguments are optional and may include the javascript function definition and a hash of html_options.
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# The +function+ argument can be omitted in favor of an +update_page+
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# block, which evaluates to a string when the template is rendered
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# (instead of making an Ajax request first).
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# The +html_options+ will accept a hash of html attributes for the link tag. Some examples are :class => "nav_button", :id => "articles_nav_button"
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# Note: if you choose to specify the javascript function in a block, but would like to pass html_options, set the +function+ parameter to nil
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# link_to_function "Greeting", "alert('Hello world!')"
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# <a onclick="alert('Hello world!'); return false;" href="#">Greeting</a>
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# link_to_function(image_tag("delete"), "if (confirm('Really?')) do_delete()")
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# <a onclick="if (confirm('Really?')) do_delete(); return false;" href="#">
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# <img src="/images/delete.png?" alt="Delete"/>
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# link_to_function("Show me more", nil, :id => "more_link") do |page|
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# page[:details].visual_effect :toggle_blind
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# page[:more_link].replace_html "Show me less"
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# <a href="#" id="more_link" onclick="try {
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# $("details").visualEffect("toggle_blind");
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# $("more_link").update("Show me less");
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# alert('RJS error:\n\n' + e.toString());
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# alert('$(\"details\").visualEffect(\"toggle_blind\");
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# \n$(\"more_link\").update(\"Show me less\");');
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# return false;">Show me more</a>
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def link_to_function(name, *args, &block)
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html_options = args.extract_options!.symbolize_keys
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function = block_given? ? update_page(&block) : args[0] || ''
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onclick = "#{"#{html_options[:onclick]}; " if html_options[:onclick]}#{function}; return false;"
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href = html_options[:href] || '#'
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content_tag(:a, name, html_options.merge(:href => href, :onclick => onclick))
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# Returns a button with the given +name+ text that'll trigger a JavaScript +function+ using the
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# The first argument +name+ is used as the button's value or display text.
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# The next arguments are optional and may include the javascript function definition and a hash of html_options.
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# The +function+ argument can be omitted in favor of an +update_page+
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# block, which evaluates to a string when the template is rendered
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# (instead of making an Ajax request first).
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# The +html_options+ will accept a hash of html attributes for the link tag. Some examples are :class => "nav_button", :id => "articles_nav_button"
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# Note: if you choose to specify the javascript function in a block, but would like to pass html_options, set the +function+ parameter to nil
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# button_to_function "Greeting", "alert('Hello world!')"
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# button_to_function "Delete", "if (confirm('Really?')) do_delete()"
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# button_to_function "Details" do |page|
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# page[:details].visual_effect :toggle_slide
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# button_to_function "Details", :class => "details_button" do |page|
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# page[:details].visual_effect :toggle_slide
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def button_to_function(name, *args, &block)
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html_options = args.extract_options!.symbolize_keys
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function = block_given? ? update_page(&block) : args[0] || ''
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onclick = "#{"#{html_options[:onclick]}; " if html_options[:onclick]}#{function};"
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tag(:input, html_options.merge(:type => 'button', :value => name, :onclick => onclick))
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# Escape carrier returns and single and double quotes for JavaScript segments.
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def escape_javascript(javascript)
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javascript.gsub(/(\\|<\/|\r\n|[\n\r"'])/) { JS_ESCAPE_MAP[$1] }
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# Returns a JavaScript tag with the +content+ inside. Example:
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# javascript_tag "alert('All is good')"
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# <script type="text/javascript">
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# alert('All is good')
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# +html_options+ may be a hash of attributes for the <script> tag. Example:
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# javascript_tag "alert('All is good')", :defer => 'defer'
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# # => <script defer="defer" type="text/javascript">alert('All is good')</script>
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# Instead of passing the content as an argument, you can also use a block
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# in which case, you pass your +html_options+ as the first parameter.
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# <% javascript_tag :defer => 'defer' do -%>
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# alert('All is good')
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def javascript_tag(content_or_options_with_block = nil, html_options = {}, &block)
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html_options = content_or_options_with_block if content_or_options_with_block.is_a?(Hash)
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content_or_options_with_block
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tag = content_tag(:script, javascript_cdata_section(content), html_options.merge(:type => Mime::JS))
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if block_called_from_erb?(block)
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def javascript_cdata_section(content) #:nodoc:
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"\n//#{cdata_section("\n#{content}\n//")}\n"
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def options_for_javascript(options)
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"{#{options.keys.map { |k| "#{k}:#{options[k]}" }.sort.join(', ')}}"
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def array_or_string_for_javascript(option)
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if option.kind_of?(Array)
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"['#{option.join('\',\'')}']"