Linked Lovelace UI by @daredoes

A pure JS client-side implementation of re-usable cards between Home Assistant Dashboards (excluding Overview).

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Hey you! Help me out for a couple of :beers: or a :coffee:!

Create cards in the Lovelace UI that can be linked to multiple dashboards
Provide templating when creating linked cards using https://eta.js.org/
- Create dynamic partials from local templates, or online templates!
- Access Template Data with variable context e.g. <%= context.name %>

Add through HACS

Name	Type	Requirement	Description	Default
type	string	Required	While normally required, this will be replaced
ll_template	string	Optional	ll_key name	``
ll_context	object	Optional	An object that can be accessed inside of EtaJS as `context`	``

Name	Type	Requirement	Description	Default
type	string	Required	A normal Lovelace card type
ll_key	string	Required	The name you want to use for this template	``
ll_priority	number	Optional	Used in sorting the order that templates are added to the system for nesting. Lowest number comes first.	`0`

Name	Type	Requirement	Description	Default
type	string	Required	`custom:linked-lovelace-partials`
partials	list	Optional	A list of partials you want to use in Eta JS	``

A `partial` object has the following shape	Name	Type	Requirement	Description
key	string	Required	The name you want to use for this partial in Eta JS
priority	number	Optional	Used in sorting the order that templates are added to the system for nesting. Lowest number comes first.	`0`
url	string	Optional	A url that will have a GET request made to it, and have its response body used as `template`.	``
template	string	Required	The content that will be used as the Eta JS. If `url` is given, it will be downloaded and replace this.	``

Install Linked Lovelace 2.0
Navigate to a user-created dashboard. (pretty much anything but Overview I think)
Put the content from sample-dashboard.yml into your dashboard using the raw configuration editor. The result should look like
Click "Update All" and it should now look like Before -> After
Reverse engineer it for your own needs, or file an issue, or join the discord to chat with me directly about it.

You no longer need "Template Dashboards". Make any top-level card in a view on any user-created dashboard a template by adding ll_key: template_name to the config.
- If you need to choose the order these templates are processed for nested templates you can use ll_priority: 0.
- The templates are sorted by lowest number first, so if you want to use templateA in templateB, templateB should have ll_priority: 1 to be rendered after templateA has been added to our collection of available templates.
template_data or ll_data must now be set to ll_context
template must now be set to ll_template
ll_keys mostly works still. two tests involving overriding context failed if someone wants to fix them. I'm considering removing this feature entirely.
To convert an old template data variable, $example$ , just swap the first $ to <%= and the second $ to %>, and retrieve the variable from context.
- example: <%= context.example %>
file an issue if I forgot something plz UwU