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Recently, I was creating an event registration Webform. I created a custom composite field with the fields needed for each registrant: first name, last name, and a set of three radio options for their organization status: member, non-member, membership fee included in event registration. Each status has a different registration fee. I then wanted to create a computed Twig field that would…

Continue reading Calculate a value from options field in Webform custom composite element with Twig - Drupal 8

A common pattern for websites is a list of content, for example news, with one (or more) featured items, followed by a list of a few more items, excluding the featured one(s). This seems like it should be simple to do, but it's not as straightforward as it seems. Here's an example of how to achieve it with Views in Drupal 8. There are many ways of flagging featured content. In this case, we want…

Continue reading How to create a View with a featured item and a list that excludes the featured item, Drupal 8

I've been working on a site with events, and tearing my hair out over how to print formatted dates with the correct timezone value in Twig templates, specifically node.html.twig and views-view-fields.html.twig. The issue was first, getting the formatted date to display in the template; and secondly, when I managed to get it displaying, it was not in the correct timezone; it was off by several…

Continue reading Print formatted date with correct timezone from datetime or daterange field in node and Views templates - Drupal 8

I'm working on a website which has icons on file upload links, like so: This works for people who can see the icons, but what about those who can't? Accessibility means giving all users an equivalent experience, regardless of how they're accessing the site. If the icons were inline images, we could add alt text with the filetype. However, in this case, they're background images. So, we want to…

Continue reading Add file type indicator to file field links for accessibility - Drupal 8

By default, the label for the core Search module text input in Drupal 8 is invisible, that is, it's present but visually hidden so users of assistive technology can read it. But what if you want to display it visually? There's no way to do it through configuration, and little to no information about how to do it with code. I found where the visibility was being set, in SearchBlockForm.php in the…

Continue reading How to make core search block form label visible - Drupal 8

Data attributes on HTML elements can be very handy for targeting certain elements with CSS and/or Javascript. Let's say, for example, we have a site with a menu whose links have a different background colour depending on what category they belong to, cats or dogs. The HTML might look like this: <ul class="menu">  <li class="menu-item">    <a…

Continue reading How to add title as data attribute to menu links in Drupal 8 and Twig

I've been working on a website with the requirement to truncate certain text fields—display the first several words of the text, with a "show more" link which on click, expands the rest of the text. I had to dig a bit into the Twig documentation to figure it out, but it's easily done with Twig filters and a bit of JavaScript. In this case, we're working with a field called "synopsis" and we…

Continue reading Truncated expanding text field with "show more" link in Drupal 8 & Twig

(Note that this technique is totally deprecated by Flexbox and CSS Grid, but it's interesting for historical purposes, I guess). If you've ever tried to do it, you know that vertically centring elements in CSS is notoriously difficult. Horizontal centring is a relative breeze, but vertical is another story. I often have a use-case where I want to vertically centre some text on top of an image,…

Continue reading How to vertically center text in an absolutely-positioned div over an image