![]() ![]() If there is some logic or programming needed to generate the content of theīlock or page. Note that you should only write code to provide blocks and menu router entries These steps are described in the following sections. Then write a function to generate the output in the case of a menu routerĮntry, you will also need to define permissions for accessing the URL. InĮither case, you will need to register with Drupal for the block or URL, and To provide a chunk of output that can be placed on one or more of a site’s HTML-based pages. Is used by a Flash script on your site, an RSS feed, or an AJAX response). Page, or in some cases, the entire output for the URL (such as XML output that A menu router entryĪllows you to respond to a URL request by providing the main HTML content for that Whether to provide a menu router entry or a block. Need your module to output some content, the first choice you need to make is In Drupal 7 and earlier versions of Drupal, assuming that you have decided you Methods in this section of the book for best results. Standard processes, rather than working within the Drupal framework. Most of these ways would, however, amount to subverting Drupal’s Response to a URL request, or that would place content in a region on a page or Ways that you could consider writing code for Drupal that would return output in Given that Drupal has many hooks and that it is written in PHP, there are many Writing and maintaining contributed modules on, custom programmingįor the website, and providing patches for Drupal core andĬontributed modules, the Registering for URLs and Displaying Content section covers the common threads. I’ve done for the Drupal project, which has included Use existing contributed modules wherever I can, rather than jumping straight Programming I’ve needed to do as a freelance site builder, given that I tend to Needed to do in my freelance work as a Drupal site builder and my volunteer work I chose these particular examples because they are all things I’ve actually There, and then read them in more detail when you need them. My advice would be to skim the sections of this chapter now so you know what is In Drupal programming that you can use to enhance websites built with Drupal. Your programming skills to work! This section of the book covers special topics If you're not familiar with field collections, try to first digest the answer to " this question".Now that you have learned the basic principles of Drupal programming and how toĪvoid making common Drupal programming mistakes, it’s time to put Īfter adding a price of 2.45 for field collection item with id 1, subtotal is 2.45.Īfter adding a price of 9.15 for field collection item with id 2, subtotal is 11.60.Īfter adding a price of 1.23 for field collection item with id 4, subtotal is 16.23. the Drupal messages that are shown: Drupal calculator started. Here is a sample of my test results, i.e. So that only item 2 and 3 (without its last sub-bullet) is left as Rules Actions. ![]() After you're convinced it works as it should, just remove all Rules Actions with Show a message on the site. ![]() ![]() Obviously, this rule is rather a prototype. The Total price for all prices included as field collection items is 26.23. Show a message on the site, with a message like so:Īfter adding a price of 3.40 for field collection item with id 3, subtotal is 15.00. Remark: not sure (not tested), but maybe this calculation_result variable can be replaced straight by total_price (in the previous action), so that you would not need this action. Set a data value, which simply copies the value stored in variable calculation_result in my total_price (defined in Rules Action 2 above). Show a message on the site, with a message like so:Īdd a variable, whereas it is a variable named total_price, decimal (2 digits), initial value 0.Īdd a loop, to iterate over each item of my field collection field (with machine name field_article_details), and perform these Rules Actions for each iteration:Ĭalculate a value, which calculates the sum of total_price (defined in Rules Action 2 above) and article-details-item:field-price (this is the machine name of the field in the field collection that contains the prices, decimal with 2 digits), and stores the result (sum) in variable calculation_result.Wake up, here is where the magic (fun?) is going to happen. Rules Condition:Įntity has field, whereas the entity is "node", and the machine name of my field collection field is field_article_details (adapt this machine name to whatever fits, but make sure you use the field collection field itself). Rules Event:Ĭontent is viewed (of type Article), adapt the machine name of the content type article to whatever fits (or use any other Rules Event that fits). Some more details about this rule are below. Processing Field collection items with Rules is fun, really! Have a look at this Rule (in Rules export format): ![]()
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