By Cody Fauser
ISBN-10: 0596528094
ISBN-13: 9780596528096
RJS templates are a thrilling and strong new form of template additional to Rails 1.1. in contrast to traditional Rails templates that generate HTML or XML, RJS templates generate JavaScript code that's performed whilst it's back to the browser. This JavaScript new release lets you practice a number of web page updates in-place with no web page reload utilizing Ajax. all of the JavaScript you wish is generated from easy templates written in Ruby. This record is helping you get conversant in how RJS templates healthy into the Rails framework and will get you begun with a number of easy-to-follow examples.
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Extra info for RJS Templates for Rails
Example text
InnerHTML); }); find(variable){|value, index| block } A synonym for JavaScriptCollectionProxy#detect(). find_all(variable){|value, index| block } Each element is passed to the given block. The block is converted to a JavaScript iterator function. The JavaScript variable is assigned to an Array of all elements for which the iterator function does not return false. empty(); }); grep(variable, pattern){|value, index| block } Each DOM element with a toString() matching the Regexp pattern is passed to the given block.
Ruby objects are automatically converted to JavaScript objects by calling the object's to_json method if it has one, or inspect if it doesn't. assign 'name', { :first => "Cody", :last => "Fauser" } // Generated JavaScript name = { "first": "Cody", "last": "Fauser" }; alert(message) Displays a JavaScript alert dialog box with the provided message. ) Calls a JavaScript function and passes in zero or more arguments. call 'displayError', 'An error occurred', 'Critical' // Generated JavaScript displayError("An error occurred", "Critical"); You can call methods on custom objects that you've added to your page by specifying the variable name and the method call.
It is great to have summary calculations and total expenses update automatically. It is amazing that all of this can be done with so little code (see Figure 6). Figure -2. Instant gratification updating multiple page elements with new data. Refactoring with RJS Helpers Now that the new expenses are being correctly inserted and the total is properly updated, we can go ahead and refactor the RJS template using the RJS helper methods. The separate tasks are displaying the errors to the user, updating the summary, inserting and highlighting a new expense, and updating the total amount.
RJS Templates for Rails by Cody Fauser
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