Cannot link to another blocks anchors

[StephenMakrogianni]

Issue:

In the WYSIWYG editor, content authors cannot link to another blocks anchors.

Proposed solution

• Create a hook or move existing hook on SiteTree::getAnchorsOnPage() and update the list with the selected page's anchors categorized by the Elemental block they are in.

• Change how the list is displayed to something similar to the tree drop down field where the content author could select the Elemental block to anchor to or one of it's "children" (anchors in the WYSIWYG).

Note:
I have started working on the solution and am taking the following into consideration:

• Multiple EementalArea on a single page
• Multiple HTMLText fields on an Element
• Making this an optional configuration
• A setting to make the Element undiscoverable
• An optional name to be used as the id of the Element. Will fallback to the Title or generate UID if Title is unset
• Ensure anchor link doesn't display as broken in WYSIWYG.

Anything else put it in a comment.

Related

#894

PRs

• [WIP] API Enable support for extensions to get anchor links silverstripe-cms#2675
• NEW Get anchor links from elemental pages #911

[mfendeksilverstripe]

I suggest to use getUniqueKey() to generate the anchor IDs.

[StephenMakrogianni]

Nice one @mfendeksilverstripe 👍 will do.

[brynwhyman]

Hey @StephenMakrogianni how have you been getting on with a solution here?

[StephenMakrogianni]

@brynwhyman haven't had a chance to get to it yet mate. Hack day is coming up though so might give it a nudge then

[GuySartorelli]

The root problem here is that anchors inside an elemental block are not properly supported. This will be resolved with #186, so I'm closing this issue in favour of that one.