Ruby HAML-JS

Precompiles the HAML-JS templates into a function.

Compatibility

This gem is compatible with Sprocket 2 and 3 only.

Due to changes in the transformer/processor interface of Sprockets 4, Tilt (this gem relies on the Tilt::Template class) can't work with Sprockets 4 as expected anymore.

Reference: Tilt's issue.

How to use

This can be used as a standalone template or as part of Rails 3.1 assets pipeline.

For example, if you have a file app/assets/javascripts/templates/comment.jst.hamljs with the following content:

.comment
  .author= author
  .text= text

Then it will be compiled on the server side into a plain JavaScript function. It doesn't require you to do anything on the client side. And the result will look like this:

(function() {
  this.JST || (this.JST = {});
  this.JST["templates/comment"] = function (locals) { function html_escape(text) {
      return (text + "").
        replace(/&/g, "&").
        replace(/</g, "&lt;").
        replace(/>/g, "&gt;").
        replace(/\"/g, "&quot;");
    }
  with(locals || {}) {
    try {
     var _$output="<div class=\"comment\"><div class=\"author\">" + 
  html_escape(author) + 
  "</div><div class=\"text\">" + 
  html_escape(text) + 
  "</div></div>";
   return _$output;  } catch (e) {
      return "\n<pre class='error'>" + html_escape(e.stack) + "</pre>\n";
    }
  }
  };
}).call(this);

Then you access that template like so:

var commentView = JST['templates/comment'];
// ...
// Somewhere in your code later:
var html = commentView({author: 'Dima', text: 'Looks nice'});

Installation

# Gemfile
gem 'ruby-haml-js'

# Then install it
bundle

Usage - with Rails 3.1 assets pipeline

1. Put your template unders app/assets/javascripts (or other path where Rails can find it).
2. Use the naming my-template.jst.hamljs.
3. Serve the template to browser by require my-template from application.js or link to it as my-template.js
4. Use the template from the JavaScript: JST['my-template']({your: 'local', variables: 'go here'})

Configuration

Custom HTML escape

You can change the escape function from the built-in, autogenerated to your own:

# Set it somewhere, before generating the template.
# Good place can be a Rails initializer.
RubyHamlJs::Template.custom_escape = "App.escape_html"

This will use the given function and will not generate custom escape code inside each template. But you need to make sure that the function is defined before using the templates in JavaScript.

Custom haml.js

If you need a custom version of haml.js library you may specify it using the haml_path

RubyHamlJs::Template.haml_path = "path/to/haml.js"

Development

• Source hosted at GitHub
• Report issues and feature requests to GitHub Issues

Pull requests are very welcome! But please write the specs.

To start, clone the repo and then:

bundle install
bundle exec rspec spec/