This attribute changes tag attribute(s) value(s).

            <a href="http://www.foo.com" title="some foo link" tal:attributes="href somelink/href; title somelink/title" tal:content="somelink/text">sample link</a>

          

With a ' somelink' having:

            $somelink->href = "http://www.google.com";
$somelink->title = "google search engine";
$somelink->text = "the google search engine";

          

Will produce:

            <a href="http://www.google.com" title="google search engine">the google search engine</a>

          

Semicolon ( ;) separates attributes. If you want semicolon to be output in an attribute, you have to double it ( ;;).

A somewhat complicated example involving tal:repeat:

            <tr tal:repeat="ranking playerRankings" tal:attributes="class php: repeat.ranking.odd ? 'odd' : NULL">
    …
</tr>

          

The php: modifier will be explained later, basically if the line is odd then tr will have a class attribute with "odd" as value, otherwise, no class will be set.

The " condition ? then : else" is a regular PHP expression which must be used with care but has proven to be useful on more than one occasion.

A better way to achieve the same result would be to ask your PHP coder to create a custom modifier for your needs (see PHP integration / custom modifiers) which would be used as follows:

            <tr tal:repeat="ranking playerRankings" tal:attributes="class css-odd:repeat/ranking/odd">
  …
</tr>

          

The modifier would return "odd" if repeat/ranking/odd is true, NULL otherwise.

              … tal:attributes="title object/tooltip | nothing"> 
            

              <input type="checkbox" tal:attributes="checked object/isChecked"/>