Aug 13, 2013

Angular.js – create reusable HTML widgets with directives

What is a directive?

Angular directives are a very powerful component of the Angular framework. They can control how the page is rendered in many different ways. Many of the attributes and tags built in to Angular are directives, such as ‘ng-show’, ‘ng-hide’, ‘ng-repeat’, etc. One way they can be used is to create HTML an widget that you can re-use across different partials.

How to create a simple directive

The Angular.js directive documentation goes into deep technical detail on how directives are implemented. This deep dive could be useful for complex directives, but it can obscure how easy it is to create simple directives. For example, suppose we want a re-usable HTML widget that messages displays to the user. The first thing we’ll do is create the directive:

As you can see, the code to define the directive is pretty minimal. The ‘scope: false’ tells Angular to not create a separate scope for the directive and just pass through the scope from the parent controller. And the ‘restrict: E’ says to only allow this directive to be used in an HTML element.

Next, let’s create the template body:

partials/widgets/messages.html:

Since we set ‘scope: false’ in the directive definition, errorMessage and successMessage are coming from the parent controller’s $scope. The controller code may contain something along these lines:

Finally, to use the new widget we just include this snippet in one of our partials:

And that’s a quick way to create a re-usable HTML widget with Angular.js.

About the Author

Object Partners profile.

One thought on “Angular.js – create reusable HTML widgets with directives

Comments are closed.

Related Blog Posts
Performance Test Liquibase Update
When doing a liquibase update to a database if you’re having performance issues, it can be hard to find out which updates are causing problems. If you need to measure the time to apply each […]
TICK Stack Monitoring for the Non-Technical
TICK – Telegraf, Influx, Chronograf, and Kapacitor – is a method of monitoring your systems and applications. In this article, I discuss in non-technical terms what the difference is between TICK and Prometheus Grafana A […]
Design Systems, Part 1 • Introduction
Business leaders need a practical guide to plan and execute Design System Initiatives. The aim of this series is to be that guide. This installment introduces terms and definitions as a primer on Design Systems.
ML for Translating Dysarthria Speech (Pre-Part 1)
What is Dysarthria? Per the Mayo Clinic, Dysarthria occurs when the muscles you use for speech are weak or you have difficulty controlling them. Dysarthria often causes slurred or slow speech that can be difficult […]