Is it possible to have an event emitted by updating the socket or some other method independent of DOM events? A use case would be to have the LiveComponent emit an event when a state change satisfies a certain criteria.
This would be how I would like to use the event prop in code:
defmodule IsFiveCount do
use Surface.LiveComponent
prop is_five, :event
data count, :integer, default: 0
def render(assigns) do
~H"""
<div>
<h1 class="title">
{{ @count }}
</h1>
<div>
<button class="button is-info" :on-click="dec">-</button>
<button class="button is-info" :on-click="inc">+</button>
</div>
</div>
"""
end
def handle_event("inc", _, socket) do
if socket.assigns.count == 4 do
socket = emit(socket, :is_five)
end
{:noreply, update(socket, :count, &(&1 + 1))}
end
def handle_event("dec", _, socket) do
if socket.assigns.count == 6 do
socket = emit(socket, :is_five)
end
{:noreply, update(socket, :count, &(&1 - 1))}
end
defmodule Parent do
use Surface.LiveComponent
def render(assigns) do
~H"""
<IsFiveCount is_five="signal" />
"""
end
def handle_event("signal", _, socket) do
# Do something.
end
In Vue you would get this functionality using the $emit function.
