Integrating with the Token Module From Contrib for Drupal 7

The Token API built into Drupal 7 core provides the ability to add placeholder tokens and replace them with dynamic values. But it's missing some critical features. A UI for allowing end users to browse the list of available tokens for example. And core only provides some very basic tokens, missing support for things like field values. In this lesson we'll look at additional functionality provided by the token module from contrib and how we can make use if it to provide both a UI for browsing available tokens as well as better validation of form elements with tokens in them.

First we'll download and install the token module from contrib and look at some of the features it provides us with without having to write any code.

Then, we'll look at using theme_token_tree_link() to provide our end users with a user interface for browsing the tokens available in a given context. theme_token_tree_link() also allows us to specify the token types that should be displayed so we can limit the list to just those that are relevant.

Finally, we'll look at using the token_element_validate() function as an extra element validator on our Form API element where we allow users to enter strings of text that contain tokens. This validator will provide valuation of the tokens entered into the form element, for example: if the valid token types are 'node' which means they can only use 'node' tokens in that field. This makes sure that the tokens you enter into a field will work in that context.

Additional resources

• Token module
• Token module documentation