1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
|
Mix.install([
{:phoenix_playground, ">= 0.0.0"}
])
defmodule SimpleComponent do
use Phoenix.Component
attr :count, :integer, required: true
slot :inner_block, required: true
def counter(assigns) do
~H"""
<p>Count: {@count}</p>
<button
phx-click="component-clicked"
phx-value-count={@count + 1}>
{render_slot(@inner_block)}
</button>
"""
end
end
defmodule SimpleLiveView do
use Phoenix.LiveView
import SimpleComponent
def render(assigns) do
~H"""
<.counter count={@count}>Click me</.counter>
"""
end
def mount(_params, _session, socket) do
{:ok, assign(socket, count: 0)}
end
# This works, but our LiveView has no control besides the assign name.
def handle_event("component-clicked", %{"count" => count}, socket) do
count = String.to_integer(count)
{:noreply, assign(socket, count: count)}
end
end
defmodule SmartComponent do
use Phoenix.Component
attr :count, :integer, required: true
attr :on_click, :any, required: true
slot :inner_block, required: true
def counter(assigns) do
~H"""
<p>Count: {@count}</p>
<button phx-click={@on_click} phx-value-count={@count + 1}>
{render_slot(@inner_block)}
</button>
"""
end
end
defmodule SmartLiveView do
use Phoenix.LiveView
alias Phoenix.LiveView.JS
import SmartComponent
def render(assigns) do
~H"""
<h2>Custom Event Counter</h2>
<.counter count={@custom_event_count} on_click="custom-event">
Increment Custom Event Counter
</.counter>
<h2>Query Params Counter</h2>
<.counter
count={@query_params_count}
on_click={JS.patch("/smart?count=#{@query_params_count + 1}")}
>
Increment Query Params
</.counter>
"""
end
def mount(_params, _session, socket) do
{:ok, assign(socket, custom_event_count: 0, query_params_count: 0)}
end
def handle_event("custom-event", %{"count" => count}, socket) do
count = String.to_integer(count)
{:noreply, assign(socket, custom_event_count: count)}
end
def handle_params(params, _uri, socket) do
count = params["count"] || "0"
count = String.to_integer(count)
{:noreply, assign(socket, query_params_count: count)}
end
end
defmodule CallbackComponent do
use Phoenix.Component
attr :count, :integer, required: true
attr :on_click, :any, required: true
slot :inner_block, required: true
def counter(assigns) do
~H"""
<p>Count: {@count}</p>
<button
phx-click={@on_click && @on_click.(%{count: @count + 1})}
phx-value-count={@count + 1}
>
{render_slot(@inner_block)}
</button>
"""
end
end
defmodule CallbackLiveView do
use Phoenix.LiveView
alias Phoenix.LiveView.JS
import CallbackComponent
def render(assigns) do
~H"""
<h2>Query Params Counter</h2>
<.counter
count={@query_params_count}
on_click={fn %{count: new_count} ->
JS.patch("/callback?count=#{new_count}")
end}
>
Increment Query Params
</.counter>
<h2>Custom Event Counter</h2>
<.counter
count={@custom_event_count}
on_click={fn %{count: new_count} ->
JS.push("increment-counter", value: %{count: new_count})
end}
>
Click me
</.counter>
"""
end
def mount(_params, _session, socket) do
{:ok, assign(socket, query_params_count: 0, custom_event_count: 0)}
end
def handle_params(params, _uri, socket) do
count = params["count"] || "0"
count = String.to_integer(count)
{:noreply, assign(socket, query_params_count: count)}
end
def handle_event("increment-counter", %{"count" => count}, socket) do
{:noreply, assign(socket, custom_event_count: count)}
end
end
defmodule SmartestComponent do
use Phoenix.Component
alias Phoenix.LiveView.JS
attr :count, :integer, required: true
attr :on_click, :any, required: true
slot :inner_block, required: true
def counter(assigns) do
~H"""
<p>Count: {@count}</p>
<button
phx-click={generate_on_click(@on_click, %{count: @count + 1})}
phx-value-count={@count + 1}
>
{render_slot(@inner_block)}
</button>
"""
end
defp generate_on_click(on_click_attr, context) do
case on_click_attr do
nil -> nil
click when is_binary(click) -> click
%JS{} = click -> click
click when is_function(click, 1) -> click.(context)
end
end
end
defmodule SmartestLiveView do
use Phoenix.LiveView
alias Phoenix.LiveView.JS
import SmartestComponent
def render(assigns) do
~H"""
<h2>Query Params Counter</h2>
<.counter
count={@query_params_count}
on_click={fn %{count: new_count} ->
JS.patch("/smartest?count=#{new_count}")
end}
>
Increment Query Params
</.counter>
<h2>Custom Event Counter</h2>
<.counter
count={@custom_event_count}
on_click={fn %{count: new_count} ->
JS.push("increment-event", value: %{count: new_count})
end}
>
Click me
</.counter>
<h2>JS Push Counter</h2>
<.counter count={@js_push_count} on_click={fn %{count: new_count} ->
JS.push("js-push-increment", value: %{count: new_count})
end}
>
Click me
</.counter>
"""
end
def mount(_params, _session, socket) do
{:ok, assign(socket, query_params_count: 0, custom_event_count: 0, js_push_count: 0)}
end
def handle_event("increment-event", %{"count" => count}, socket) do
count = String.to_integer(count)
{:noreply, assign(socket, custom_event_count: count)}
end
def handle_event("js-push-increment", %{"count" => count}, socket) do
count = String.to_integer(count)
{:noreply, assign(socket, js_push_count: count)}
end
def handle_params(params, _uri, socket) do
count = params["count"] || "0"
count = String.to_integer(count)
{:noreply, assign(socket, query_params_count: count)}
end
end
defmodule CalendarComponent do
use Phoenix.Component
attr :current_date, :map, required: true
attr :selected_month, :map, required: true
attr :events, :list, default: []
attr :date_changed, :any, required: true
attr :date_clicked, :any, default: nil
def calendar(assigns) do
assigns = assign(assigns, events_map: Enum.group_by(assigns.events, & &1.date))
~H"""
<div style="width: 100%; max-width: 800px; margin: 0 auto;">
<div style="display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px;">
<button phx-click={@date_changed && @date_changed.(%{selected_month: shift_month(@selected_month, -1)})} style="padding: 8px 16px; border: 1px solid #ddd; background: #fff; cursor: pointer;">
Previous
</button>
<button phx-click={@date_changed && @date_changed.(%{selected_month: shift_month(Date.utc_today(), 0)})} style="padding: 8px 16px; border: 1px solid #ddd; background: #fff; cursor: pointer;">
Today
</button>
<h2 style="margin: 0; font-size: 1.5rem;">
<%= Calendar.strftime(@selected_month, "%B %Y") %>
</h2>
<button phx-click={@date_changed && @date_changed.(%{selected_month: Date.shift(@selected_month, month: 1)})} style="padding: 8px 16px; border: 1px solid #ddd; background: #fff; cursor: pointer;">
Next
</button>
</div>
<div style="display: grid; grid-template-columns: repeat(7, 1fr); gap: 1px; background: #ddd;">
<%= for day <- ["Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"] do %>
<div style="background: #f8f8f8; padding: 10px; text-align: center; font-weight: bold;">
<%= day %>
</div>
<% end %>
<%= for date <- calendar_days(@selected_month) do %>
<div phx-click={@date_clicked && @date_clicked.(%{date: date})} style={"background: #fff; padding: 10px; min-height: 100px; position: relative;#{if run_handler(@date_clicked, %{date: date}), do: " cursor: pointer;", else: ""}#{if date == @current_date, do: " background: lightyellow;", else: ""}"}>
<div style={"position: absolute; top: 5px; left: 5px;#{if date.month != @selected_month.month, do: " color: #999", else: ""}"}>
<%= date.day %>
</div>
<div style="margin-top: 25px;">
<%= for event <- Map.get(@events_map, date, []) do %>
<div
phx-click={run_handler(@date_clicked, %{date: date, event: event})}
style={"background: #e3f2fd; padding: 4px 8px; margin-bottom: 4px; border-radius: 4px; font-size: 0.875rem;#{if run_handler(@date_clicked, %{date: date, event: event}), do: " cursor: pointer;", else: ""}"}
>
<%= event.title %>
</div>
<% end %>
</div>
</div>
<% end %>
</div>
</div>
"""
end
defp shift_month(date, amount), do: Date.shift(date, month: amount)
defp run_handler(handler, context), do: handler && handler.(context)
defp calendar_days(date) do
first_day = Date.beginning_of_month(date)
last_day = Date.end_of_month(date)
first_calendar_day = Date.add(first_day, -rem(Date.day_of_week(first_day) - 1, 7))
last_calendar_day = Date.add(last_day, 7 - rem(Date.day_of_week(last_day), 7))
Date.range(first_calendar_day, last_calendar_day)
end
end
defmodule CalendarLive do
use Phoenix.LiveView
alias Phoenix.LiveView.JS
import CalendarComponent
def render(assigns) do
~H"""
<.calendar
:if={@live_action == :calendar}
current_date={@current_date}
selected_month={@selected_month}
events={@events}
date_changed={fn %{selected_month: new_month} -> JS.patch("/calendar?selected_month=#{new_month}") end}
date_clicked={&build_date_clicked/1}
/>
<%= if @live_action == :event do %>
<.link patch={"/calendar?selected_month=#{@selected_month}"}>Back to calendar</.link>
<h2>Event</h2>
<dl>
<dt>ID</dt>
<dd><%= @event.id %></dd>
<dt>Title</dt>
<dd><%= @event.title %></dd>
<dt>Date</dt>
<dd><%= Calendar.strftime(@event.date, "%B %d, %Y") %></dd>
</dl>
<% end %>
"""
end
defp build_date_clicked(%{date: _date, event: event}) do
if event[:disabled] do
nil
else
JS.patch("/calendar/event/#{event[:id]}")
end
end
defp build_date_clicked(_), do: nil
def mount(_params, _session, socket) do
current_date = Date.utc_today()
socket = socket
|> assign(:current_date, current_date)
|> assign(:events, events_for_month(current_date))
{:ok, socket}
end
def handle_params(%{"id" => id}, _uri, socket) do
event = get_event(id)
event_date = event.date
{:noreply, socket |> assign(event: event) |> assign_new(:selected_month, fn -> event_date end)}
end
def handle_params(params, _uri, socket) do
selected_month =
if month_str = params["selected_month"] do
Date.from_iso8601!(month_str)
else
Date.utc_today()
end
events = events_for_month(selected_month)
{:noreply, assign(socket, selected_month: selected_month, events: events)}
end
defp get_event(id) do
sample_events() |> Enum.find(&(&1.id == String.to_integer(id)))
end
defp events_for_month(month) do
sample_events()
|> Enum.filter(fn event -> event.date.month == month.month && event.date.year == month.year end)
end
defp sample_events do
reference_date = Date.utc_today()
[
%{id: 1, date: reference_date, title: "Pretzel Day"},
%{id: 2, date: reference_date, title: "Brains Storming"},
%{id: 3, date: Date.add(reference_date, 2), title: "Neon Night Market"},
%{id: 4, date: Date.shift(reference_date, month: 1), title: "National Noodle Day"},
%{id: 5, date: Date.shift(reference_date, month: 2), title: "Client Review"},
%{id: 6, date: Date.add(reference_date, -5), title: "Time Traveler's Meeting"}
]
end
end
defmodule Layouts do
use Phoenix.Component
def playground(assigns) do
~H"""
<header style="display: flex; justify-content: center; gap: 10px; margin-bottom: 20px;">
<.link patch="/simple">Simple</.link>
<.link patch="/smart">Smart</.link>
<.link patch="/callback">Callback</.link>
<.link patch="/smartest">Smartest</.link>
<.link patch="/calendar">Calendar</.link>
</header>
<main style="display: flex; justify-content: center;">
<div style="width: 100%; max-width: 800px;">
{@inner_content}
</div>
</main>
"""
end
end
defmodule RedirectController do
use Phoenix.Controller
def index(conn, _params) do
redirect(conn, to: conn.private[:to])
end
end
defmodule PlaygroundRouter do
use Phoenix.Router
import Phoenix.LiveView.Router
pipeline :browser do
plug :accepts, ["html"]
plug :fetch_session
plug :put_root_layout, html: {PhoenixPlayground.Layout, :root}
plug :put_layout, html: {Layouts, :playground}
plug :put_secure_browser_headers
end
scope "/" do
pipe_through :browser
get "/", RedirectController, :index, private: %{to: "/simple"}
live_session :playground, layout: {Layouts, :playground} do
live "/simple", SimpleLiveView
live "/smart", SmartLiveView
live "/callback", CallbackLiveView
live "/smartest", SmartestLiveView
live "/calendar", CalendarLive, :calendar
live "/calendar/event/:id", CalendarLive, :event
end
end
end
PhoenixPlayground.start(plug: PlaygroundRouter)
# Run this file with:
# iex playground.exs
|
