My last post covered the topic how ActiveScaffold and Unobtrusive Javascript may fit together. This time I would like to give you an example.
It s Activescaffold’s TinyMCE Bridge. It s a perfect example, cause it s a pure javascript feature.
Let’s take a look at the bridge file using obtrusive javascript:

Loading tinymce editor

Obtrusive Javascript

def active_scaffold_input_text_editor(column, options)
    options[:class] = "#{options[:class]} mceEditor #{column.options[:class]}".strip
    html = []
    html << send(override_input(:textarea), column, options)
    html << javascript_tag("tinyMCE.execCommand('mceAddControl', false, '#{options[:id]}');") if request.xhr?
    html.join "\n"
end

We use an activescaffold input override to add javascript code to our textareas.

Unobtrusive Javascript

$('form.as_form').live('as:form_loaded', function(event) {
  var as_form = $(this).closest("form");
  as_form.find('textarea.as_mceEditor').each(function(index, elem) {
    tinyMCE.execCommand('mceAddControl', false, $(elem).attr('id'));
  });
  return true;
});

A listener to activescaffold form_load event, finding all textareas and adding tinyMCE control.

Submitting tinymce editor

Obtrusive Javascript

def onsubmit
    if ActiveScaffold.js_framework == :jquery
       submit_js = 'tinyMCE.triggerSave();$(\'textarea.mceEditor\').each(function(index, elem) { tinyMCE.execCommand(\'mceRemoveControl\', false, $(elem).attr(\'id\')); });' if using_tiny_mce?
    else
       submit_js = 'tinyMCE.triggerSave();this.select(\'textarea.mceEditor\').each(function(elem) { tinyMCE.execCommand(\'mceRemoveControl\', false, elem.id); });' if using_tiny_mce?
    end
    [super, submit_js].compact.join ';'
end

We use form submit method override to add javascript code, which will call tinyMCE.triggerSave method.

Unobtrusive Javascript

$('form.as_form').live('as:form_submit', function(event) {
  var as_form = $(this).closest("form");
  if (as_form.has('textarea.as_mceEditor').length > 0) {
    tinyMCE.triggerSave();
  }
  return true;
});

A listener to activescaffold form_submit event, finding all textareas using tinyMCE and calling triggerSave.

Removing tinymce editor

Obtrusive Javascript

def active_scaffold_includes(*args)
        if ActiveScaffold.js_framework == :jquery
          tiny_mce_js = javascript_tag(%|
var action_link_close = ActiveScaffold.ActionLink.Abstract.prototype.close;
ActiveScaffold.ActionLink.Abstract.prototype.close = function() {
$(this.adapter).find('textarea.mceEditor').each(function(index, elem) {
tinyMCE.execCommand('mceRemoveControl', false, $(elem).attr('id'));
});
action_link_close.apply(this);
};
|) if using_tiny_mce?
        else
        ....
        end
        super(*args) + (include_tiny_mce_if_needed || '') + (tiny_mce_js || '')
      end

Ok, we add a javascript code snippet to activescaffold includes in case using_tiny_mce? returns true. Javascript code will link into action link.close action management and will remove our tiny_mce_editor. To be honest I do not like that solution at all. :-)

Unobtrusive Version

$('form.as_form').live('as:form_unloaded', function(event) {
  var as_form = $(this).closest("form");
  as_form.find('textarea.as_mceEditor').each(function(index, elem) {
    tinyMCE.execCommand('mceRemoveControl', false, $(elem).attr('id'));
  });
  return true;
});

A listener to activescaffold form_unload event, finding all textareas and removing tinyMCE control.

Summary

Did we achieve our goals?
We ve separated javascript code from ruby code. which improves code quality and maintainability. You do not have to be an activescaffold expert anymore to add javascript functionality to forms, form_columns, list_columns. You just need to know javascript.

Hope that helps.

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