Cool, thanks both of you! Both approaches actually work as I intended.
@Daniel: wow, AWESOME reply! Thanks for bringing me to the next directive
grokking level : )
Fwiw, I'll rename the resume func to something more verbose like
resumeCompilation as it not only applies to the ngModel directive.
Cheers,
Carsten
On Thursday, January 9, 2014 1:55:55 AM UTC+1, Daniel Tabuenca wrote:
>
> This is a common requirement, but it’s not immediately clear how to do it
> in a straight-forward fashion. I’ve talked with Miško from the angular team
> and he confirmed that the following is the propper way to dynamically add
> directives:
>
> app.directive('foo', function($compile, $parse) {
> return {
> restrict: 'A',
> priority: 9999,
> terminal: true, //Pause Compilation to give us the opportunity to add our
> directives
> compile: function(el, attr) {
> attr.$set('ngModel', 'name')
> var ngModelLink = $compile(el, null, 9999); //Resume compilation at
> priority 9999 so that our directive doesn't get re-compiled
> return function(scope) {
> ngModelLink(scope); //Return the link function from the new
> compilation
> }
> }
> }
> });
>
> The problem is that angular determines the list of directives to compile
> *BEFORE* your directive is called. By the time you are executing your
> compile function, it is too late and angular won’t compile any additional
> directives you add to the current element (although it will compile
> anything you add to children).
>
> We cannot simply add the directive to element and call $compile() on it
> either because then our directive will be compiled again, causing an
> infinite loop.
>
> What we have to do is stop compilation at our directive (by giving it a a
> high priority and adding terminal: true. We can then add the attributes
> to the element and call $compile() but pass it which priority to compile
> from. If we pass the same priority as our directive it means our directive
> and any higher-priority directives will not be compiled again (only
> directives lower than the priority passed in will get compiled). This
> allows us to essentially resume compilation allowing angular to scan for
> any new directives and compile them.
>
> There are a few other ways you can do this, but this one is the cleanest.
> I’ve seen other people inject the directives themselves (e.g.
> ngModelDirective) and then manually call the compile and link functions on
> them, but this gets tricky when directives have additional require:sections
> and is just not as clean.
>
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