Ajax in Java

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Ajax
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1223 [](id)
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This returns a reference of the element identified by id in the DOM Further calls can then be made on this element reference like hide, show, and so on This behaves just like the $(id) construct in jQuery
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render :update do |page| page['my_div']hide # same thing as $('my_div')hide end
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12: Ajax on Rails
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1224 alert(message)
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This will display a JavaScript alert with the given message:
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render :update do |page| pagealert('Something is not right here') end
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1225 call(function, *arguments, & block)
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Calls the JavaScript function with the given arguments if any If a block is given, a new JavaScript generator will be created and all generated JavaScript will be wrapped in a function() { } and passed as the class final argument
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// applicationjs function my_method() { alert('my_method called'); } // my_controllersrb class MyControllers < Application def show render :update do |page| pagecall('my_method') end end end
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1226 delay(seconds = 1)
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This will execute the given block after the given number of seconds have passed
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render :update do |page| pagedelay(5) { pagevisual_effect :highlight, 'results_div', :duration => 15 } end
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1227 draggable(id, options = {})
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This creates a draggable element (draggable elements are discussed in the section Drag and Drop
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122 Writing JavaScript in Ruby with RJS
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1228 drop receiving(id, options = {})
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This creates a drop receiving element, which is discussed in the section Drag and Drop
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1229 hide(*ids)
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Hides the elements identified by the given DOM ids
render :update do |page| pagehide('options_div') pagehide('options_form', 'options_message') end
12210 insert html(position, id,
*options for render)
Inserts HTML at the given position relative to the given element identified by the DOM id Position can be any one of the values shown in Table 121 The options_for_render can be either a string of HTML to insert or options passed to render
render :update do |page| pageinsert_html :after, 'my_div', '<br/><p>My Text</p>' pageinsert_html :before, 'my_other_div', :partial => 'list_items' end
12211 literal(code)
This is used to pass a literal JavaScript expression as an argument to another JavaScript generator method The returned object will have a to_json method that will evaluate to code
Table 121 Options for insert_html Method Parameter Description
:top :bottom :before :after
Ajax
HTML is inserted inside the element, before the element s existing content HTML is inserted inside the element, after the element s existing content HTML is inserted immediately preceding the element HTML is inserted immediately following the element
12: Ajax on Rails
12212 redirect to(location)
Causes the browser to redirect to the given location
render :update do |page| pageredirect_to 'http://wwwberlinde' end
12213 remove(*ids)
Removes the given elements identified by the DOM ids
12214 replace(id, *options for render)
Replaces the entire element (not just its internal HTML) identified by the DOM id with either a string or render options set in options_for_render
render :update do |page| pagereplace 'my_div', '<div>Message</div>' pagereplace 'my_div', :partial => 'entry' end
12215 replace html(id, *options for render)
Replaces the internal HTML identified by the DOM id with either a string or render options set in options_for_render
12216 select(pattern)
Obtains a collection of element references by finding it through a CSS pattern You can use standard jQuery enumerations with the returned collection
render :update do |page| pageselect('divheader p')first pageselect('divbody ul li')each do |value| valuehide end end
12217 show(*ids)
Show the given hidden elements identified by the DOM ids
12218 sortable(id, options = {})
Creates a sortable element that is discussed in the section Sortable
123 Ajax and JSON
12219 toggle(*ids)
Toggles the visibility of the elements identified by the ids In other words, visible elements will become hidden and hidden elements will become visible
12220 visual effect(name, id = nil,
options = {})
This will start the named effect on the element identified by the DOM id From RJS you can call appear, fade, slidedown, slideup, blinddown, and blindup Each of these effects results in an element showing or hiding on the page You can also call toggle_appear, toggle_slide, and toggle_blind to toggle the effect For a complete list of visual effects, not just the displaying of elements, and options they take, consult the Scriptaculous documentation To fade an element, we would do the following:
render :update do |page| pagevisual_effect :fade, 'my_div' end
123 Ajax and JSON
JavaScript Object Notation (JSON) is a simple way to encode JavaScript objects It is also considered a language-independent data format, making it a compact, human-readable, and versatile interchange format This is the preferred method of interchanging data between the web application code running on the server and any code running in the browser, particularly for Ajax requests Rails provides a to_json on every object, using a sensible mechanism to do so for every type For example, BigDecimal objects, although numbers, are serialized to JSON as strings, since that is the best way to represent a BigDecimal in a language-independent manner You can always customize the to_json method of any of your classes if you wish, but it should not be necessary to do so