Quicktips

DrupalEasy Quicktips are short, focused posts intended to accomplish a very specific goal. Quicktips are exclusively available first via our @drupaleasy Twitter account.

Block Visibility

I was recently was asked by a client to assist them in creating and displaying a block that would only appear on certain pages within the site. In their case, they wanted to only display the block on node pages - but only when the node was of a particular content type.

Transparent PNGs

The Portable Network Graphics (PNG) format is a great way to display graphics on the web. It is meant to be a one-for-one replacement for the Graphics Interchange Format (GIF) but without all the proprietary craziness (for awhile there, UNISYS owned a patent that involved the GIF format). Unfortunately, its adoption has not been as fast or as complete as one would have hoped. The PNG format is lossless and generally compresses images better than GIF.

Finding the Right Module for the Job

With over 4,000 available modules, there's no way that anyone can know what each and every single module does. In my opinion, many developers often resort to writing custom modules too quickly without doing their due diligence in looking for an existing module to accomplish the same task.

When I'm working on a site that I think might require a custom module, there's a few steps I take before I break open my code editor (currently Espresso).

A Better Drupal API Documentation Site

The brainiacs over at Lullabot recently unveiled api.lullabot.com, their version of Drupal.org's API documentation site. While on the outset, it seems similar, there are some nice features of the Lullabot site that make it very worthwhile to use.

First and foremost, in addition to documentation for Drupal core, they also added the documentation for a large number of popular Drupal modules, including Views, CCK, and Ubercart.

Submitting Disabled Fields

The "disabled" attribute for form fields is a great little user interface helper that you can use to help protect data from accidental changes. It locks down an HTML input form element so that it can be viewed, but not be changed. This is handy when displaying a form to a user where you need an extra layer of protection for the data.

What happens when the user goes to submit a form with disabled elements? The value of the disabled elements are not passed back to the browser - this can quickly turn into a data validation and/or submission issue.

Your Best Friend When Theming Views

Views 2 for Drupal 6 was quite the upgrade for those of us who were comfortable with the original version. It was pretty much a stellar upgrade in all aspects, but it requires a bit of knowledge and commitment to reach the point where you feel comfortable and confident with it.

In my opinion, one aspect of Views 2 that doesn't get the attention it deserves is the fantastic template-based way that it handles theming. You can theme virtually any aspect of a views result by overriding any number of template file.

Module Development: Settings Variables in settings.php Using $conf

Sometimes you need to set some global variables in Drupal that aren't used by just a single module, but rather a set of modules. You can take advantage of the $conf array in your site's settings.php file to set these variables that your various modules can then access them using the "variable_get()" method.

For example, I have a client that pulls in some data from an external SQL Server database to their Drupal site. Data is pulled in by a variety of custom modules and they wanted to have a single, secure place to set the database connection information.