link_to_function

Returns a link that will trigger a JavaScript function using the onclick handler and return false after the fact.

The function argument can be omitted in favor of an update_page block, which evaluates to a string when the template is rendered (instead of making an Ajax request first).

Examples:

  link_to_function "Greeting", "alert('Hello world!')"
    Produces:
      <a onclick="alert('Hello world!'); return false;" href="#">Greeting</a>

  link_to_function(image_tag("delete"), "if (confirm('Really?')) do_delete()")
    Produces:
      <a onclick="if (confirm('Really?')) do_delete(); return false;" href="#">
        <img src="/images/delete.png?" alt="Delete"/>
      </a>

  link_to_function("Show me more", nil, :id => "more_link") do |page|
    page[:details].visual_effect  :toggle_blind
    page[:more_link].replace_html "Show me less"
  end
    Produces:
      <a href="#" id="more_link" onclick="try {
        $(&quot;details&quot;).visualEffect(&quot;toggle_blind&quot;);
        $(&quot;more_link&quot;).update(&quot;Show me less&quot;);
      }
      catch (e) {
        alert('RJS error:\n\n' + e.toString());
        alert('$(\&quot;details\&quot;).visualEffect(\&quot;toggle_blind\&quot;);
        \n$(\&quot;more_link\&quot;).update(\&quot;Show me less\&quot;);');
        throw e
      };
      return false;">Show me more</a>