How do I include inline JavaScript in Haml?

Question

:javascript
    $(document).ready( function() {
      $('body').addClass( 'test' );
    } );

Docs: http://haml.info/docs/yardoc/file.REFERENCE.html#javascript-filter

You can actually do what Chris Chalmers does in his answer, but you must make sure that HAML doesn't parse the JavaScript. This approach is actually useful when you need to use a different type than text/javascript, which is was I needed to do for MathJax.

You can use the plain filter to keep HAML from parsing the script and throwing an illegal nesting error:

%script{type: "text/x-mathjax-config"}
  :plain
    MathJax.Hub.Config({
      tex2jax: {
        inlineMath: [["$","$"],["\\(","\\)"]]
      }
    });

So i tried the above :javascript which works :) However HAML wraps the generated code in CDATA like so:

<script type="text/javascript">
  //<![CDATA[
    $(document).ready( function() {
       $('body').addClass( 'test' );
    } );
  //]]>
</script>

The following HAML will generate the typical tag for including (for example) typekit or google analytics code.

 %script{:type=>"text/javascript"}
  //your code goes here - dont forget the indent!

I'm using fileupload-jquery in haml. The original js is below:

<!-- The template to display files available for download -->
<script id="template-download" type="text/x-tmpl">
  {% for (var i=0, file; file=o.files[i]; i++) { %}
    <tr class="template-download fade">
      {% if (file.error) { %}
        <td></td>
        <td class="name"><span>{%=file.name%}</span></td>
        <td class="size"><span>{%=o.formatFileSize(file.size)%}</span></td>
        <td class="error" colspan="2"><span class="label label-important">{%=locale.fileupload.error%}</span> {%=locale.fileupload.errors[file.error] || file.error%}</td>
        {% } else { %}
        <td class="preview">{% if (file.thumbnail_url) { %}
          <a href="{%=file.url%}" title="{%=file.name%}" rel="gallery" download="{%=file.name%}"><img src="{%=file.thumbnail_url%}"></a>
          {% } %}</td>
        <td class="name">
          <a href="{%=file.url%}" title="{%=file.name%}" rel="{%=file.thumbnail_url&&'gallery'%}" download="{%=file.name%}">{%=file.name%}</a>
        </td>
        <td class="size"><span>{%=o.formatFileSize(file.size)%}</span></td>
        <td colspan="2"></td>
        {% } %}
      <td class="delete">
        <button class="btn btn-danger" data-type="{%=file.delete_type%}" data-url="{%=file.delete_url%}">
          <i class="icon-trash icon-white"></i>
          <span>{%=locale.fileupload.destroy%}</span>
        </button>
        <input type="checkbox" name="delete" value="1">
      </td>
    </tr>
    {% } %}
</script>

At first I used the :cdata to convert (from html2haml), it doesn't work properly (Delete button can't remove relevant component in callback).

<script id='template-download' type='text/x-tmpl'>
      <![CDATA[
          {% for (var i=0, file; file=o.files[i]; i++) { %}
          <tr class="template-download fade">
          {% if (file.error) { %}
          <td></td>
          <td class="name"><span>{%=file.name%}</span></td>
          <td class="size"><span>{%=o.formatFileSize(file.size)%}</span></td>
          <td class="error" colspan="2"><span class="label label-important">{%=locale.fileupload.error%}</span> {%=locale.fileupload.errors[file.error] || file.error%}</td>
          {% } else { %}
          <td class="preview">{% if (file.thumbnail_url) { %}
          <a href="{%=file.url%}" title="{%=file.name%}" rel="gallery" download="{%=file.name%}"><img src="{%=file.thumbnail_url%}"></a>
          {% } %}</td>
          <td class="name">
          <a href="{%=file.url%}" title="{%=file.name%}" rel="{%=file.thumbnail_url&&'gallery'%}" download="{%=file.name%}">{%=file.name%}</a>
          </td>
          <td class="size"><span>{%=o.formatFileSize(file.size)%}</span></td>
          <td colspan="2"></td>
          {% } %}
          <td class="delete">
          <button class="btn btn-danger" data-type="{%=file.delete_type%}" data-url="{%=file.delete_url%}">
          <i class="icon-trash icon-white"></i>
          <span>{%=locale.fileupload.destroy%}</span>
          </button>
          <input type="checkbox" name="delete" value="1">
          </td>
          </tr>
          {% } %}
      ]]>
    </script>

So I use :plain filter:

%script#template-download{:type => "text/x-tmpl"}
  :plain
    {% for (var i=0, file; file=o.files[i]; i++) { %}
    <tr class="template-download fade">
    {% if (file.error) { %}
    <td></td>
    <td class="name"><span>{%=file.name%}</span></td>
    <td class="size"><span>{%=o.formatFileSize(file.size)%}</span></td>
    <td class="error" colspan="2"><span class="label label-important">{%=locale.fileupload.error%}</span> {%=locale.fileupload.errors[file.error] || file.error%}</td>
    {% } else { %}
    <td class="preview">{% if (file.thumbnail_url) { %}
    <a href="{%=file.url%}" title="{%=file.name%}" rel="gallery" download="{%=file.name%}"><img src="{%=file.thumbnail_url%}"></a>
    {% } %}</td>
    <td class="name">
    <a href="{%=file.url%}" title="{%=file.name%}" rel="{%=file.thumbnail_url&&'gallery'%}" download="{%=file.name%}">{%=file.name%}</a>
    </td>
    <td class="size"><span>{%=o.formatFileSize(file.size)%}</span></td>
    <td colspan="2"></td>
    {% } %}
    <td class="delete">
    <button class="btn btn-danger" data-type="{%=file.delete_type%}" data-url="{%=file.delete_url%}">
    <i class="icon-trash icon-white"></i>
    <span>{%=locale.fileupload.destroy%}</span>
    </button>
    <input type="checkbox" name="delete" value="1">
    </td>
    </tr>
    {% } %}

The converted result is exactly the same as the original.

So :plain filter in this senario fits my need.

:plain Does not parse the filtered text. This is useful for large blocks of text without HTML tags, when you don’t want lines starting with . or - to be parsed.

For more detail, please refer to haml.info