Update Placeholder after initialization

[mugnap]

Hello,

I'd like to have the ability, for an Inline editor, to update the placeholder at runtime (i.e. after the editor has been created). Is there any way to do that? Currently the placeholder is set in the configuration options, so I can't change it later. I found this thread #7383 but I think nothing has changed yet.
Thanks!

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[urbanspr1nter]

I'd really like to know if there's any ability to do this yet.. Is there an easy way in v37+?

@Witoso something probably worth thinking about. CKE5 can be used for a variety of scenarios such as chat apps. For example, in Slack, the placeholder will change depending on which channel or chat you are in.

Having a convenient way to update the root editable placeholder would be really nice..

[Witoso]

@urbanspr1nter thanks for bringing this to my attention! I haven't found an easy way to do that, unfortunately :/ I will keep it in my mind in our future API discussion.

[mlewand]

Some precedence is with viewportOffset config. At runtime it is reflected in EditorUI#viewportOffset property.

Currently the enablePlaceholder method is called in EditorUI implementation (e.g. in ClassicEditorUI). It passes the placeholder text, editingRoot and couple of auxillary properties.

Logically, the placeholder is a property of a specific RootEditableElement instance, so it make sense to set the placeholder value there.

By doing so we could remove the need of passing placeholder text all along, as enablePlaceholder should start listen to the placeholder property of a passed RootEditableElement instance.

If the integrator wants to change the placeholder value at a runtime would need to execute editor.editing.view.document.getRoot( 'main' ).placeholder = 'new placeholder' to make a change.

Remarks

• Remember there's multiroot configuration and it must be possible to specify a distinct placeholder for a given root.
• There's a guide related to placeholoders. We should add an example on how to change the placeholder at a runtime.