ng-scope class is set on root DOM element linked with public linking function (returned by $compile()) even if directive does not create new scope

[danilsomsikov]

See http://jsfiddle.net/danilsomsikov/aEpkh/

Original fiddle with transclusion function http://jsfiddle.net/danilsomsikov/mMWyU/4/

[pkozlowski-opensource]

@danilsomsikov this works as designed. In fact a directive can create 2 sibling scopes as explained in http://docs.angularjs.org/guide/directive (check the "Understanding Transclusion and Scopes" section).

BTW: there was a nice article published just few days back that also touches on problem of transclusion:
http://blog.omkarpatil.com/2012/11/transclude-in-angularjs.html

[petebacondarwin]

Is this not because the transclusion itself creates a new scope?

On 30 November 2012 15:48, Danil Somsikov notifications@github.com wrote:

See http://jsfiddle.net/danilsomsikov/mMWyU/4/

—
Reply to this email directly or view it on GitHubhttps://github.com//issues/1633.

[danilsomsikov]

But as you can see in fiddle there's only one scope created, however there're two elements having css class ng-scope.

[pkozlowski-opensource]

@danilsomsikov oh, sorry, didn't notice that both scopes got the same ID, I was sure that we are talking about this case: http://jsfiddle.net/GqqmS/4/

Anyway, I saw already an issue opened for those spans: #1293
There was a thread about is well: https://groups.google.com/forum/?fromgroups=#!msg/angular/2rPL2lqdCho/QU37wXUPyxoJ

Comments from Misko were:

You can thank microsoft for the spans. :-) So in IE we have this issue that we can't attach data to text content. We solve this by wrapping the text in spans. And that is what you see. Simply get rid of whitespace in your markup and spans will disappear with it. This is a bug, so you should file it, although I am not sure we can fix it without breaking IE.

On a related note, i think maybe you should do it differently. Try using the compile function to manually change the DOM structure. The template property is a short hand for compile and it looks like you have reached the end of what it can do.

So I guess it is the best to comment on your case in #1293 as this one seems to be duplicate of #1293.

[danilsomsikov]

Spans are not the case as well. I don't know why did I put it to the sample code.
The problems persist without any spans.
See http://jsfiddle.net/danilsomsikov/mMWyU/5/
Directive element has ng-scope class on it, which it should not have.

[pkozlowski-opensource]

@danilsomsikov Danil, thnx for providing more info, this starts to look interesting now. So this is not a new transcusion scope nor additional spans and I can't explain why this scope class is added without digging more into the code.

Re-opening this one, probably people more familiar with $compile should look into it.

[danilsomsikov]

The class is added at this line.

[petebacondarwin]

ng-scope is also added in applyDirectivesToNode() on line 558: https://github.com/angular/angular.js/blob/master/src/ng/compile.js#L558

[danilsomsikov]

Yes, however it is not the case in the issue I report.

[petebacondarwin]

Yes you are right!

So at https://github.com/angular/angular.js/blob/master/src/ng/compile.js#L585 you can see that the transclude function is created by a call to compile(). It is this call to compile that applies the ng-scope.

Now I guess the assumption is that if you are transcluding then you are going to create a new child scope for the transclusion, i.e. scope.$new(...). You are not doing this. You are just passing the directive's original scope into the transclusion function.

But then you are not really getting much use out of transclude in this case - you could just let the compiler pass down to the child elements itself.

I guess that you real use case is doing something more clever. But if it is then you should probably be creating a new scope and then being responsible for destroying it later, if necessary.

[petebacondarwin]

http://plnkr.co/edit/k6qR7KCw4GJ1X2EA375w?p=preview

[danilsomsikov]

It turns that public linking function (the one returned by $compile(...)) is setting ng-scope CSS class and $scope data even if element does not create new scope.