fix(core): not inserting ViewContainerRef nodes when inside root of a component #39599
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crisbeto
reviewed
Nov 7, 2020
| const tNode = tData[parentTNode.index] as TNode; | ||
| const encapsulation = (tData[tNode.directiveStart] as ComponentDef<any>).encapsulation; | ||
| const encapsulation = | ||
| (tView.data[parentTNode.directiveStart] as ComponentDef<unknown>).encapsulation; |
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These changes aren't required for the fix, I just noticed that the tNode and parentTNode are always the same here.
petebacondarwin
reviewed
Nov 9, 2020
… component When a `ViewContainerRef` is injected, we dynamically create a comment node next to the host so that it can be used as an anchor point for inserting views. The comment node is inserted through the `appendChild` helper from `node_manipulation.ts` in most cases. The problem with using `appendChild` here is that it has some extra logic which doesn't return a parent `RNode` if an element is at the root of a component. I __think__ that this is a performance optimization which is used to avoid inserting an element in one place in the DOM and then moving it a bit later when it is projected. This can break down in some cases when creating a `ViewContainerRef` for a non-component node at the root of another component like the following: ``` <root> <div #viewContainerRef></div> </root> ``` In this case the `#viewContainerRef` node is at the root of a component so we intentionally don't insert it, but since its anchor element was created manually, it'll never be projected. This will prevent any views added through the `ViewContainerRef` from being inserted into the DOM. These changes resolve the issue by not going through `appendChild` at all when creating a comment node for `ViewContainerRef`. This should work identically since `appendChild` doesn't really do anything with the T structures anyway, it only uses them to reach the relevant DOM nodes. Fixes angular#39556.
…ot of a component
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@AndrewKushnir the feedback has been addressed. |
crisbeto
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@crisbeto FYI presubmit is successful for the changes in this PR. The missing piece is the "target" label, could you please set one when you get a chance? Thank you. |
atscott
added a commit
that referenced
this issue
Nov 12, 2020
… component (#39599) When a `ViewContainerRef` is injected, we dynamically create a comment node next to the host so that it can be used as an anchor point for inserting views. The comment node is inserted through the `appendChild` helper from `node_manipulation.ts` in most cases. The problem with using `appendChild` here is that it has some extra logic which doesn't return a parent `RNode` if an element is at the root of a component. I __think__ that this is a performance optimization which is used to avoid inserting an element in one place in the DOM and then moving it a bit later when it is projected. This can break down in some cases when creating a `ViewContainerRef` for a non-component node at the root of another component like the following: ``` <root> <div #viewContainerRef></div> </root> ``` In this case the `#viewContainerRef` node is at the root of a component so we intentionally don't insert it, but since its anchor element was created manually, it'll never be projected. This will prevent any views added through the `ViewContainerRef` from being inserted into the DOM. These changes resolve the issue by not going through `appendChild` at all when creating a comment node for `ViewContainerRef`. This should work identically since `appendChild` doesn't really do anything with the T structures anyway, it only uses them to reach the relevant DOM nodes. Fixes #39556. PR Close #39599
basherr
added a commit
to basherr/angular
that referenced
this issue
Nov 14, 2020
… component (angular#39599) When a `ViewContainerRef` is injected, we dynamically create a comment node next to the host so that it can be used as an anchor point for inserting views. The comment node is inserted through the `appendChild` helper from `node_manipulation.ts` in most cases. The problem with using `appendChild` here is that it has some extra logic which doesn't return a parent `RNode` if an element is at the root of a component. I __think__ that this is a performance optimization which is used to avoid inserting an element in one place in the DOM and then moving it a bit later when it is projected. This can break down in some cases when creating a `ViewContainerRef` for a non-component node at the root of another component like the following: ``` <root> <div #viewContainerRef></div> </root> ``` In this case the `#viewContainerRef` node is at the root of a component so we intentionally don't insert it, but since its anchor element was created manually, it'll never be projected. This will prevent any views added through the `ViewContainerRef` from being inserted into the DOM. These changes resolve the issue by not going through `appendChild` at all when creating a comment node for `ViewContainerRef`. This should work identically since `appendChild` doesn't really do anything with the T structures anyway, it only uses them to reach the relevant DOM nodes. Fixes angular#39556. PR Close angular#39599
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When a
ViewContainerRefis injected, we dynamically create a comment node next to the host so that it can be used as an anchor point for inserting views. The comment node is inserted through theappendChildhelper fromnode_manipulation.tsin most cases.The problem with using
appendChildhere is that it has some extra logic which doesn't return a parentRNodeif an element is at the root of a component. I think that this is a performance optimization which is used to avoid inserting an element in one place in the DOM and then moving it a bit later when it is projected. This can break down in some cases when creating aViewContainerReffor a non-component node at the root of another component like the following:In this case the
#viewContainerRefnode is at the root of a component so we intentionally don't insert it, but since its anchor element was created manually, it'll never be projected. This will prevent any views added through theViewContainerReffrom being inserted into the DOM.These changes resolve the issue by not going through
appendChildat all when creating a comment node forViewContainerRef. This should work identically sinceappendChilddoesn't really do anything with the T structures anyway, it only uses them to reach the relevant DOM nodes.Fixes #39556.