Another day, another post with me talking about something I barely know about. Today I’m going to show you my
first second stab at a recursive Angular.js directive.
Let’s first have a look at the end goal (forgive the as of yet unfinished css and bad contrasting colors)
Basically we have a list of objects in the dependency tree, each of these in turn can contain a list of children.
Lets have a look at the JSON we are trying to represent
It’s pretty simple, each dependency can have children that are in fact themselves the very same object literal types.
I created two directives, one for the dependency and one for it’s children.
As seen from the screen clipping the directives are pretty simple, however I’d like to draw your attentions to the link function of the curve directive. The reason I had to do this is because on my first attempt I tried to just call the <dependencies in the template itself with an angular ng-if, however angular.js just kept going into an infinite loop, so I added the children <ul> on the fly and $compiled them in (note: $compile is injected).
The templates for these widgets are pretty trivial (i could have in-lined with “template” but choose to use templateUrl as I much prefer this approach.
This template just creates a <ul> and then calls the other directive that creates the <li> entries.
This template shows the <li> entries, remember that I $compile in any children in the directive, it also adds a good or bad class if necessary for styling.
I hope this helps someone should they also encounter the same problem I did with the infinite loop, I’m definitely not saying what is presented above is best practise as I’m relatively new to angular.js after hanging up my knockout.js belt (it was good while it lasted but angular is much more in line what what I need for SPA apps).