#Html treeview code#
The above code snippet details about ng-template where elements are used. The advantage of using ng-container directive is that it will not be added as another DOM element in the DOM tree except the template it refers too. The above code snippet lets Angular engine know that it has to render the HTML code defined inside an ng-template with name treeViewList and pass items as an implicit variable. Okay, let's dissect the HTML code snippet together: Hierarchical TreeView list is generated after updating template HTML with the above code snippet. This will enable us to dynamically render the HTML instead of hard/hand-coding.
Ng-container, ng-template, and ngTemplateOut are angular structure directives which are used to change the structure of the DOM by adding or removing elements.įirst, is updated to use the JSONArray that we mentioned at the beginning of the post. Data-driven hierarchical tree view implementation using ng-container, ng-template, and ngTemplateOutlet recursively. Let’s see how we can incorporate this in our tree view component. We also discussed that in real-world scenarios, instead of hand-coding the HTML code, quite often a JSONArray data is provided which is used to render the Tree View Structure. If we observe the static HTML code, it is obvious that same combination is repeated for parent and child nodes i.e., a template with just one can be called recursively with appropriate contextual data to render the hierarchical structure. Let's go ahead and start implementing Hierarchical TreeView list.Īt the beginning of this post, we briefly discussed how a combination of ul and li tag can be used to generate a Hierarchical Tree View List. Now that we have successfully integrated the newly created TreeViewComponent with AppModule. Step by Step implementation of angular tree view component (hierarchical list) which is screen-reader friendly and is keyboard navigableīefore we jump into implementing an angular component, let us quickly look at how a simple basic (without accessible attributes) HTML code snippet looks like:Īngular renders default implementation of after adding My attempt here is to bridge the missing gap and build reusable angular web components which are easy to configure and 100% accessible. Most of the open-source solutions provided are really good but quite often lack accessibility features like keyboard navigation, appropriate roles, ARIA attributes, or state management, etc., which will make them screen-reader friendly. The file system navigation would be a classic example and quick google search would yield various results ranging from open to proprietary angular libraries which can be readily used in any web application projects.
An item(or node) in the hierarchical list may have child items which either expand or collapse to show or hide child items. In this post, we will discuss an angular (version 8) Tree View component which presents a hierarchical list. Web Accessibility: Angular Hierarchical Tree View Component with keyboard navigation
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