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llms_ctx.txt
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<document>
<title>FastHTML Gallery Examples</title>
<description>FastHTML Gallery bring minimal examples of FastHTML apps to allow you to get started with FastHTML more easily</description>
<category name="Applications">
<example name="Annotate Text">
from fasthtml.common import *
import json
import httpx
# Set up the app, including daisyui and tailwind for the chat component
tlink = Script(src="https://cdn.tailwindcss.com?plugins=typography"),
dlink = Link(rel="stylesheet", href="https://cdn.jsdelivr.net/npm/[email protected]/dist/full.min.css")
def Arrow(arrow, hx_get, id):
# Grey out button if you're at the end
if arrow == "←": ptr_evnts = "pointer-events-none opacity-50" if id == 1 else ""
elif arrow == "→": ptr_evnts = " pointer-events-none opacity-50" if id == total_items_length - 1 else ""
# CSS Styling for both arrow buttons
common_classes = "relative inline-flex items-center bg-indigo-600 px-3 py-2 text-sm font-semibold text-white shadow-sm hover:bg-indigo-500 focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-indigo-600"
return A(Span(arrow, cls="sr-only"),
Span(arrow, cls="h-5 w-5", aria_hidden="true"),
hx_get=hx_get, hx_swap="outerHTML",
cls=f" {'' if arrow=='←' else '-ml-px'} rounded-{'l' if arrow=='←' else 'r'}-md {common_classes} {ptr_evnts}")
def AnnotateButton(value, feedback):
# Different button styling if it's already marked as correct/incorrect
classes = '' if feedback=='correct' else 'btn-outline'
# Green for correct red for incorrect
classes += f" btn-{'success' if value=='correct' else 'error'}"
classes += ' mr-2' if value=='correct' else ''
return Button(value.capitalize(), name='feedback', value=value, cls='btn hover:text-white '+classes)
def render(Item):
messages = json.loads(Item.messages)
card_header = Div(cls="border-b border-gray-200 bg-white p-4")(
Div(cls="flex justify-between items-center mb-4")(
H3(f"Sample {Item.id} out of {total_items_length}" if total_items_length else "No samples in DB", cls="text-base font-semibold leading-6 text-gray-9000"),
Div(cls="flex-shrink-0")(
Arrow("←", f"{Item.id - 2}" if Item.id > 0 else "#", Item.id),
Arrow("→", f"{Item.id}" if Item.id < total_items_length - 1 else "#", Item.id))),
Div(cls="-ml-4 -mt-4 flex flex-wrap items-center justify-between sm:flex-nowrap")(
Div(cls="ml-4 mt-4")(
P(messages[0]['content'], cls="mt-1 text-sm text-gray-500 max-h-16 overflow-y-auto whitespace-pre-wrap"))))
card_buttons_form = Div(cls="mt-4")(
Form(cls="flex items-center", method="post", hx_post=f"{Item.id}", target_id=f"item_{Item.id}", hx_swap="outerHTML", hx_encoding="multipart/form-data")(
Input(type="text", name="notes", value=Item.notes, placeholder="Additional notes?", cls="flex-grow p-2 my-4 border border-gray-300 rounded-md text-sm focus:outline-none focus:ring-2 focus:ring-indigo-500 focus:border-indigo-500 bg-transparent"),
Div(cls="flex-shrink-0 ml-4")(
AnnotateButton('correct', Item.feedback),
AnnotateButton('incorrect', Item.feedback))))
# Card component
card = Div(cls=" flex flex-col h-full flex-grow overflow-auto", id=f"item_{Item.id}",
style="min-height: calc(100vh - 6rem); max-height: calc(100vh - 16rem);")(
card_header,
Div(cls="bg-white shadow rounded-b-lg p-4 pt-0 pb-10 flex-grow overflow-scroll")(
Div(messages[1]['content'], id="main_text", cls="mt-2 w-full rounded-t-lg text-sm whitespace-pre-wrap h-auto marked")),
card_buttons_form)
return card
hdrs=(tlink, dlink, picolink, MarkdownJS(), HighlightJS())
app, rt, texts_db, Item = fast_app('texts.db',hdrs=hdrs, render=render, bodykw={"data-theme":"light"},
id=int, messages=list, feedback=bool, notes=str, pk='id')
# Get Dummy Data
data_url = 'https://raw.githubusercontent.com/AnswerDotAI/fasthtml-example/main/annotate_text/data/dummy_data.jsonl'
response = httpx.get(data_url)
# Insert Dummy Data into Db
for line in response.text.splitlines():
item = json.loads(line)
texts_db.insert(messages=json.dumps(item), feedback=None, notes='')
# Set total_items_length after inserting dummy data
total_items_length = len(texts_db())
print(f"Inserted {total_items_length} items from dummy data")
@rt("/{idx}")
def post(idx: int, feedback: str = None, notes: str = None):
print(f"Posting feedback: {feedback} and notes: {notes} for item {idx}")
items = texts_db()
item = texts_db.get(idx)
item.feedback, item.notes = feedback, notes
texts_db.update(item)
next_item = next((i for i in items if i.id > item.id), items[0])
print(f"Updated item {item.id} with feedback: {feedback} and notes: {notes} moving to {next_item.id}")
return next_item
@rt("/")
@rt("/{idx}")
def get(idx:int = 0):
items = texts_db()
index = idx
if index >= len(items): index = len(items) - 1 if items else 0
# Container for card and buttons
content = Div(cls="w-full max-w-2xl mx-auto flex flex-col max-h-full")(
H1('LLM generated text annotation tool with FastHTML (and Tailwind)',cls="text-xl font-bold text-center text-gray-800 mb-8"),
items[index])
return Main(content,
cls="container mx-auto min-h-screen bg-gray-100 p-8 flex flex-col",
hx_target="this")
</example>
<example name="Cellular Automata">
from fasthtml.common import *
from starlette.responses import Response
from uuid import uuid4
generator = {}
bindict = {
(1,1,1):0,
(1,1,0):1,
(1,0,1):2,
(1,0,0):3,
(0,1,1):4,
(0,1,0):5,
(0,0,1):6,
(0,0,0):7}
initial_row = [0]*50 + [1] + [0]*50
color_map = {0:"white", 1:"black"}
####################
### HTML Widgets ###
####################
explanation = Div(
H1("Cellular Automata"),
H4("Input explanations:"),
Ul(Li(Strong("Rule: "),"Determines the next state of a cell based on the current state of the cell and its neighbors."),
Li(Strong("Generations: "),"Determines how many generations to run the automaton."),
Li(Strong("Width: "),"Determines the width of the grid."),))
def progress_bar(percent_complete: float):
return Div(hx_swap_oob="innerHTML:#progress_bar")(
Progress(value=percent_complete))
def mk_box(color,size=5):
return Div(cls="box", style=f"background-color:{color_map[color]};height:{size}px;width:{size}px;margin:0;display:inline-block;")
def mk_row(colors,font_size=0,size=5):
return Div(*[mk_box(color,size) for color in colors], cls="row",style=f"font-size:{font_size}px;")
def mk_button(show):
return Button("Hide Rule" if show else "Show Rule",
hx_get="show_rule?show=" + ("False" if show else "True"),
hx_target="#rule", id="sh_rule", hx_swap_oob="outerHTML",
hx_include="[name='rule_number']")
########################
### FastHTML Section ###
########################
app, rt = fast_app()
@rt
def index(sess):
if 'id' not in sess: sess['id'] = str(uuid4())
return Title("Cellular Automata"),Main(Div(
Div(P(explanation,id="explanations")),
Form(Group(
Div(hx_target='this', hx_swap='outerHTML')(Label(_for="rule_number", cls="form-label")("Rule"),
Input(type='number', name="rule_number", id='rule_set', value="30",hx_post='validate/rule_number')),
Div(hx_target='this', hx_swap='outerHTML')(Label("Generations", cls="form-label"),
Input(type='number',name="generations", id='generations_set', value="50",hx_post='validate/generations', hx_indicator='#generationsind')),
Div(hx_target='this', hx_swap='outerHTML')(Label("Width", cls="form-label"),
Input(type='number',name="width", id='width_set', value="100", hx_post='validate/width', hx_indicator='#widthind')),
Button(cls="btn btn-active btn-primary", type="submit", hx_get="run",
hx_target="#grid", hx_include="[name='rule_number'],[name='generations'],[name='width']", hx_swap="outerHTML")("Run"))),
Group(
Div(style="margin-left:50px")(
Div(id="progress_bar"),
Div(id="grid")),
Div(style="margin-right:50px; max-width:200px")(
mk_button(False),
Div(id="rule"),
))))
@rt('/show_rule')
def get(rule_number: int, show: bool):
rule = [int(x) for x in f'{rule_number:08b}']
return Div(
Div(mk_button(show)),
Div(*[Group(
Div(mk_row(list(k),font_size=10,size=20),style="max-width:100px"),
Div(P(" -> "),style="max-width:100px"),
Div(mk_box(rule[v],size=20),style="max-width:100px")) for k,v in bindict.items()] if show else '')
)
@rt('/run')
def get(rule_number: int, generations: int, width: int, sess):
errors = {'rule_number': validate_rule_number(rule_number),
'generations': validate_generations(generations),
'width': validate_width(width)}
# Removes the None values from the errors dictionary (No errors)
errors = {k: v for k, v in errors.items() if v is not None}
# Return Button with error message if they exist
if errors:
return Div(Div(id="grid"),
Div(id="progress_bar",hx_swap_oob="outerHTML:#progress_bar"),
Div(id='submit-btn-container',hx_swap_oob="outerHTML:#submit-btn-container")(
Button(cls="btn btn-active btn-primary", type="submit",
hx_get="run", hx_target="#grid",
hx_include="[name='rule_number'],[name='generations'],[name='width']", hx_swap="outerHTML")("Run"),
*[Div(error, style='color: red;') for error in errors.values()]))
start = [0]*(width//2) + [1] + [0]*(width//2)
global generator
generator[sess['id']] = run(rule=rule_number,generations=generations,start=start)
return Div(
Div(style=f"width: {(width+1)*5}px",id="progress_bar",hx_swap_oob="outerHTML:#progress_bar"),
Div(id="next",hx_trigger="every .1s", hx_get="next", hx_target="#grid",hx_swap="beforeend"),id="grid")
@rt('/next')
def get(sess):
global generator
g,val = next(generator[sess['id']],(False,False))
if val: return Div(
progress_bar(g),
mk_row(val))
else:
del generator[sess['id']]
return Response(status_code=286)
@rt('/validate/rule_number')
def post(rule_number: int): return inputTemplate('Rule Number', 'rule_number',rule_number, validate_rule_number(rule_number))
@rt('/validate/generations')
def post(generations: int): return inputTemplate('Generations', 'generations', generations, validate_generations(generations))
@rt('/validate/width')
def post(width: int): return inputTemplate('Width', 'width', width, validate_width(width))
#########################
### Application Logic ###
#########################
def run(rule=30, start = initial_row, generations = 100):
rule = [int(x) for x in f'{rule:08b}']
yield 0, start
old_row = [0] + start + [0]
new_row = []
for g in range(1,generations):
for i in range(1,len(old_row)-1):
key=tuple(old_row[i-1:i+2])
new_row.append(rule[bindict[key]])
yield (g+1)/generations,new_row
old_row = [0] + new_row + [0]
new_row = []
########################
### Validation Logic ###
########################
def validate_rule_number(rule_number: int):
if (rule_number < 0) or (rule_number > 255 ): return "Enter an integer between 0 and 255 (inclusive)"
def validate_generations(generations: int):
if generations < 0: return "Enter a positive integer"
if generations > 200: return "Enter a number less than 200"
def validate_width(width: int):
if width < 0: return "Enter a positive integer"
if width > 200: return "Enter a number less than 200"
def inputTemplate(label, name, val, errorMsg=None, input_type='number'):
# Generic template for replacing the input field and showing the validation message
return Div(hx_target='this', hx_swap='outerHTML', cls=f"{errorMsg if errorMsg else 'Valid'}")(
Label(label), # Creates label for the input field
Input(name=name,type=input_type,value=f'{val}',style="width: 340px;",hx_post=f'validate/{name.lower()}'), # Creates input field
Div(f'{errorMsg}', style='color: red;') if errorMsg else None) # Creates red error message below if there is an error
</example>
<example name="Csv Editor">
from fasthtml.common import *
from uuid import uuid4
db = database('sqlite.db')
hdrs = (Style('''
button,input { margin: 0 1rem; }
[role="group"] { border: 1px solid #ccc; }
.edited { outline: 2px solid orange; }
'''), )
app, rt = fast_app(hdrs=hdrs)
@rt
async def get_test_file():
import httpx
url = "https://raw.githubusercontent.com/AnswerDotAI/FastHTML-Gallery/main/applications/start_simple/csv_editor/ex_data.csv"
response = await httpx.AsyncClient().get(url)
return Response(response.text, media_type="text/csv",
headers={'Content-Disposition': 'attachment; filename="ex_data.csv"'})
@rt
def index(sess):
if 'id' not in sess: sess['id'] = str(uuid4())
return Titled("CSV Uploader",
A('Download Example CSV', href="get_test_file", download="ex_data.csv"),
Group(Input(type="file", name="csv_file", accept=".csv"),
Button("Upload", hx_post="upload", hx_target="#results",
hx_encoding="multipart/form-data", hx_include='previous input'),
A('Download', href='download', type="button")),
Div(id="results"))
def render_row(row):
vals = [Td(Input(value=v, name=k, oninput="this.classList.add('edited')")) for k,v in row.items()]
vals.append(Td(Group(Button('delete', hx_delete=remove.rt(id=row['id']).lstrip('/')),
Button('update', hx_post='update', hx_include="closest tr"))))
return Tr(*vals, hx_target='closest tr', hx_swap='outerHTML')
@rt
def download(sess):
tbl = db[sess['id']]
csv_data = [",".join(map(str, tbl.columns_dict))]
csv_data += [",".join(map(str, row.values())) for row in tbl()]
headers = {'Content-Disposition': 'attachment; filename="data.csv"'}
return Response("\n".join(csv_data), media_type="text/csv", headers=headers)
@rt('/update')
def post(d:dict, sess): return render_row(db[sess['id']].update(d))
@app.delete('/remove')
def remove(id:int, sess): db[sess['id']].delete(id)
@rt("/upload")
def post(csv_file: UploadFile, sess):
db[sess['id']].drop(ignore=True)
if not csv_file.filename.endswith('.csv'): return "Please upload a CSV file"
content = b''
for i, line in enumerate(csv_file.file):
if i >= 51: break
content += line
tbl = db.import_file(sess['id'], content, pk='id')
header = Tr(*map(Th, tbl.columns_dict))
vals = [render_row(row) for row in tbl()]
return (Span('First 50 rows only', style="color: red;") if i>=51 else '', Table(Thead(header), Tbody(*vals)))
serve()
</example>
<example name="Tic Tac Toe">
from fasthtml.common import *
style = Style("""body{
min-height: 100vh;
margin:0;
background-color: #1A1A1E;
display:grid;
}""") # custom style to be applied globally.
hdrs = (Script(src="https://cdn.tailwindcss.com") ,
Link(rel="stylesheet", href="/files/examples/applications/tic_tac_toe/output.css"))
app, rt = fast_app(hdrs=(hdrs, style), pico=False)
current_state_index = -1 #Used to navigate the current snapshot of the board
button_states = [[None for _ in range(9)] for _ in range(9)] #2D array to store snapshots of board
win_states = [
[0, 1, 2],
[3, 4, 5],
[6, 7, 8],
[0, 3, 6],
[1, 4, 7],
[2, 5, 8],
[0, 4, 8],
[2, 4, 6],
] #possible win streaks/states for Xs and Os
winner_found_game_ended = False
def check_win(player) -> bool:
global button_states, current_state_index, winner_found_game_ended
"""Checks if there's a win streak present in the board. Uses the win states list to check
If text at all text indices are equal and its not the placeholder text ("."), change the global variable "winner_found_game_ended" to True"""
for cell_1, cell_2, cell_3 in win_states:
if (
button_states[current_state_index][cell_1] != None
and button_states[current_state_index][cell_1]
== button_states[current_state_index][cell_2]
and button_states[current_state_index][cell_2]
== button_states[current_state_index][cell_3]):
winner_found_game_ended = True
return f"Player {player} wins the game!"
if all(value is not None for value in button_states[current_state_index]):
#if the current snapshot of the board doesn't have any placeholder text and there is no winning streak
winner_found_game_ended = True
return "No Winner :("
#will keep returning this value [because its called after every button click], until a winner or none is found
return f'''Player {'X' if player == 'O' else 'O'}'s turn!'''
def handle_click(index: int):
"""This function handles what text gets sent to the button's face depending on whose turn it is uses a weird algorithm"""
global button_states, current_state_index
next_index = current_state_index + 1
button_states[next_index] = button_states[current_state_index][:] #make a copy of the current snapshot to add to the next snapshot
if button_states[current_state_index][index] is None:
if "X" not in button_states[current_state_index] or button_states[
current_state_index
].count("X") <= button_states[current_state_index].count("O"):
button_states[next_index][index] = "X"
else:
button_states[next_index][index] = "O"
current_state_index += 1
return button_states[next_index][index]
@app.get("/on_click") # On click, call helper function to alternate between X and O
def render_button(index:int):
global button_states, current_state_index
player = handle_click(index)
winner = check_win(player) # function that checks if there's a winner
buttons = [Button(
f'''{text if text is not None else '.' }''',
cls="tic-button-disabled" if (text is not None) or winner_found_game_ended else "tic-button",
disabled=True if (text is not None) or winner_found_game_ended else False,
hx_get=f"on_click?index={idx}",
hx_target=".buttons-div", hx_swap='outerHTML')
for idx, text in enumerate(button_states[current_state_index])
]
"""rerenders buttons based on the next snapshot.
I initially made this to render only the button that gets clicked.
But to be able to check the winner and stop the game, I have to use the next snapshot instead
if you wanna see the previous implementation, it should be in one of the commits."""
board = Div(
Div(winner, cls="justify-self-center"),
Div(*buttons, cls="grid grid-cols-3 grid-rows-3"),
cls="buttons-div font-bevan text-white font-light grid justify-center")
return board
# Rerenders the board if the restart button is clicked.
# Also responsible for initial rendering of board when webpage is reloaded
@app.get("/restart")
def render_board():
global button_states, current_state_index, winner_found_game_ended
current_state_index = -1
button_states = [[None for _ in range(9)] for _ in range(9)]
winner_found_game_ended = False
# button component
buttons = [
Button(
".",
cls="tic-button",
hx_get=f"on_click?index={i}",
hx_swap="outerHTML", hx_target=".buttons-div")
for i, _ in enumerate(button_states[current_state_index])
]
return Div(Div("Player X starts the game",cls="font-bevan text-white justify-self-center"),
Div(*buttons, cls="grid grid-cols-3 grid-rows-3"),
cls="buttons-div grid")
@app.get("/")
def homepage():
global button_states
return Div(
Div(
H1("Tic Tac Toe!", cls="font-bevan text-5xl text-white"),
P("A FastHTML app by Adedara Adeloro", cls="font-bevan text-custom-blue font-light"),
cls="m-14"),
Div(
render_board.__wrapped__(), # render buttons.
Div(
Button(
"Restart!",
disabled=False,
cls="restart-button",
hx_get="restart", hx_target=".buttons-div", hx_swap="outerHTML"),
cls="flex flex-col items-center justify-center m-10"),
cls="flex flex-col items-center justify-center"),
cls="justify-center items-center min-h-screen bg-custom-background")
</example>
</category>
<category name="Dynamic User Interface (Htmx)">
<example name="Animations">
import random
from fasthtml.common import *
app, rt = fast_app(hdrs=(Style("""
/* CSS to center content of the app */
body { max-width: 800px; padding: 20px; width: 90%; margin: 0 auto; }
* { text-align: center; }
/* CSS to fade in to full opacity in 1 second */
#fade-me-in.htmx-added {
opacity: 0;
}
#fade-me-in {
opacity: 1;
transition: opacity 1s ease-out;
}
/* CSS to fade out to 0 opacity in 1 second */
.fade-me-out {
opacity: 1;
}
.fade-me-out.htmx-swapping {
opacity: 0;
transition: opacity 1s ease-out;
}
"""),))
@rt
def color_throb_demo():
# Each time this route is called it chooses a random color
random_color = random.choice(['red', 'blue', 'green', 'yellow', 'orange', 'purple', 'pink'])
return P("Groovy baby, yeah!", id="color-demo",
# Make text random color and do a smooth transition
style=f"color: {random_color}; transition: all 1s ease-in;",
# Call this route and replace the text every 1 second
get=color_throb_demo, hx_swap="outerHTML", hx_trigger="every 1s")
# 2. Settling Transitions
@rt
def fade_in_demo():
return Button( "Fade Me In", id="fade-me-in", class_="btn primary",
# hx_trigger defaults to click so we do not have to specify it
# When the button is clicked, create a new button with a 1 second settling transition
post=fade_in_demo, hx_swap="outerHTML settle:1s")
def in_flight_animation_demo():
" Create a form that changes its look on click. In this case it displays a 'Submitted!' response. "
return Form(
Input(name="name", style="width: 300px;", placeholder="Content field"),
Button("Submit", class_="btn primary"),
# When the button is clicked, swap it with the button specified in form_completion_message
post=form_completion_message, hx_swap="outerHTML")
@rt
def form_completion_message():
# A button with green background and white text
return Button("Submitted!", class_="btn primary",
style="background-color: green; color: white;")
# Helper function to create a section for an example
def section(title, desc, content): return Card(H2(title), P(desc), Br(), content, Br())
@rt
def index():
return Div(
H1("Text Animations"), Br(),
section("Color Throb",
"Change text color every second in a smooth transition.",
color_throb_demo()),
section("Settling Transitions",
"Make a button disappear on click and gradually fade in.",
fade_in_demo()),
section("Request In Flight Animation",
"Let a form change its look on click. In this case it displays a 'Submitted!' response.",
in_flight_animation_demo()))
serve()
</example>
<example name="Cascading Dropdowns">
from fasthtml.common import *
app, rt = fast_app()
chapters = ['ch1', 'ch2', 'ch3']
lessons = {
'ch1': ['lesson1', 'lesson2', 'lesson3'],
'ch2': ['lesson4', 'lesson5', 'lesson6'],
'ch3': ['lesson7', 'lesson8', 'lesson9']}
def mk_opts(nm, cs):
return (
Option(f'-- select {nm} --', disabled='', selected='', value=''),
*map(Option, cs))
@rt
def get_lessons(chapter: str):
return Select(*mk_opts('lesson', lessons[chapter]), name='lesson')
@rt
def index():
chapter_dropdown = Select(
*mk_opts('chapter', chapters),
name='chapter',
get='get_lessons', hx_target='#lessons')
return Div(
Div(Label("Chapter:", for_="chapter"),
chapter_dropdown),
Div(Label("Lesson:", for_="lesson"),
Div(Div(id='lessons')),))
</example>
<example name="Click To Edit">
from fasthtml.common import *
app, rt = fast_app()
flds = dict(firstName='First Name', lastName='Last Name', email='Email')
@dataclass
class Contact:
firstName:str; lastName:str; email:str; edit:bool=False
def __ft__(self):
def item(k, v):
val = getattr(self,v)
return Div(Label(Strong(k), val), Hidden(val, id=v))
return Form(
*(item(v,k) for k,v in flds.items()),
Button('Click To Edit'),
post='form', hx_swap='outerHTML')
contacts = [Contact('Joe', 'Blow', '[email protected]')]
@rt
def index(): return contacts[0]
@rt
def form(c:Contact):
def item(k,v): return Div(Label(k), Input(name=v, value=getattr(c,v)))
return Form(
*(item(v,k) for k,v in flds.items()),
Button('Submit', name='btn', value='submit'),
Button('Cancel', name='btn', value='cancel'),
post="contact", hx_swap='outerHTML'
)
@rt
def contact(c:Contact, btn:str):
if btn=='submit': contacts[0] = c
return contacts[0]
</example>
<example name="Click To Load">
from uuid import uuid4
from fasthtml.common import *
app, rt = fast_app()
agent_num = 0
@rt
def add_row():
global agent_num
agent_num += 1
return Tr(map(Td, (
f"Agent Smith {agent_num}",
f"smith{agent_num}@matrix.com",
uuid4())))
@rt
def index():
first_row = add_row()
return Div(
H1("Click to Load"),
P("Dynamically add rows to a table using HTMX."),
Table(Tr(map(Th, ("Name", "Email", "ID"))), first_row, id='tbl'),
Button("Load More...", get=add_row, hx_target="#tbl", hx_swap="beforeend"),
style="text-align: center;")
serve()
</example>
<example name="Configurable Select">
from fasthtml.common import *
from monsterui.all import *
app, rt = fast_app(hdrs=Theme.blue.headers())
@rt
def index(): return Container(H1('Configurable Select'), mk_form())
@rt
def mk_form(add_option:str=None, options:str='isaac,hamel,curtis'):
opts = options.split(',')
if add_option: opts.append(add_option)
return Form(
# fh-frankenui helper that adds both a form label and input
# and does proper linking with for, id, and name automatically
LabelInput("Add an Option", id="add_option"),
Button("Add"),
# fh-frankenui select allows for search boxes
UkSelect(map(Option, opts), searchable=True),
# When the "Add" button is pressed, make a new form
get=mk_form,
# Store options state in DOM
hx_vals={"options": ','.join(opts)},
# Replace the whole form
hx_swap="outerHTML")
serve()
</example>
<example name="Custom Keybindings">
from fasthtml.common import *
app, rt = fast_app()
@rt
def index():return Titled(
"Custom Keybindings with HTMX",
render_button("DO IT (Press `Shift + u`)"))
@rt
def doit(): return render_button("😀 DID IT! ")
def render_button(text):
return Button(text,
# Auto-focus on load
autofocus=True,
# Activate with click or U key as long as focus is in body
hx_trigger="click, keyup[key=='U'] from:body",
get=doit)
serve()
</example>
<example name="Delete Row">
from fasthtml.common import *
app, rt = fast_app()
# This represents the data we are rendering
# The data could original from a database, or any other datastore
@dataclass
class Contact:
# Data points
id: int
name: str
email: str
status: str
def __ft__(self):
# __ft__ method is used by FastHTML to render an item in the UI
# By defining this, a `Contact` will show up as a table row automatically
return Tr(
*map(Td, (self.name, self.email, self.status)),
Td(Button('Delete',
hx_delete=delete.to(id=self.id).lstrip('/'),
# Give a confirmation prompt before deleting
hx_confirm="Are you sure?",
# Target the closest row (The one you clicked on)
hx_target="closest tr",
# Removes the row with htmx
hx_swap="delete")))
# Sample data
# Often this would come from a database
contacts = [{'id':1, 'name': "Bob Deer", 'email': "[email protected]", 'status': "Active" },
{'id':2, 'name': "Jon Doe", 'email': "[email protected]", 'status': "Inactive"},
{'id':3, 'name': "Jane Smith",'email': "[email protected]",'status': "Active" }]
@rt
def index(sess):
# Save a copy of contacts in your session
# This is the demo doesn't conflict with other users
sess['contacts'] = contacts
# Create initial table
return Table(
Thead(Tr(*map(Th, ["Name", "Email", "Status", ""]))),
# A `Contact` object is rendered as a row automatically using the `__ft__` method
Tbody(*(Contact(**x) for x in sess['contacts'])))
@app.delete
def delete(id: int, sess):
sess['contacts'] = [c for c in sess['contacts'] if c['id'] != id]
serve()
</example>
<example name="Infinite Scroll">
from fasthtml.common import *
import uuid
column_names = ('name', 'email', 'id')
def generate_contact(id: int) -> Dict[str, str]:
return {'name': 'Agent Smith',
'email': f'void{str(id)}@matrix.com',
'id': str(uuid.uuid4())
}
def generate_table_row(row_num: int) -> Tr:
contact = generate_contact(row_num)
return Tr(*[Td(contact[key]) for key in column_names])
def generate_table_part(part_num: int = 1, size: int = 20) -> Tuple[Tr]:
paginated = [generate_table_row((part_num - 1) * size + i) for i in range(size)]
paginated[-1].attrs.update({
'get': f'page?idx={part_num + 1}',
'hx-trigger': 'revealed',
'hx-swap': 'afterend'})
return tuple(paginated)
app, rt = fast_app()
@rt
def index():
return Titled('Infinite Scroll',
Div(Table(
Thead(Tr(*[Th(key) for key in column_names])),
Tbody(generate_table_part(1)))))
@rt
def page(idx:int|None = 0):
return generate_table_part(idx)
</example>
<example name="Inline Validation">
from fasthtml.common import *
import re
################
### FastHTML ###
################
app, rt = fast_app()
@rt
def index():
return Form(post='submit', hx_target='#submit-btn-container', hx_swap='outerHTML')(
# Calls /email route to validate email
Div(hx_target='this', hx_swap='outerHTML')(
Label(_for='email')('Email Address'),
Input(type='text', name='email', id='email', post='email')),
# Calls /cool route to validate cool
Div(hx_target='this', hx_swap='outerHTML')(
Label(_for='cool')('Is this cool?'),
Input(type='text', name='cool', id='cool', post='cool')),
# Calls /coolscale route to validate coolscale
Div(hx_target='this', hx_swap='outerHTML')(
Label(_for='CoolScale')('How cool (scale of 1 - 10)?'),
Input(type='number', name='CoolScale', id='CoolScale', post='coolscale')),
# Submits the form which calls /submit route to validate whole form
Div(id='submit-btn-container')(
Button(type='submit', id='submit-btn',)('Submit')))
### Field Validation Routing ###
# Validates the field and generates FastHTML with appropriate validation and template function
@rt
def email(email: str): return inputTemplate('Email Address', 'email', email, validate_email(email))
@rt
def cool(cool: str): return inputTemplate('Is this cool?', 'cool', cool, validate_cool(cool))
@rt
def coolscale(CoolScale: int): return inputTemplate('How cool (scale of 1 - 10)?', 'CoolScale', CoolScale, validate_coolscale(CoolScale), input_type='number')
@rt
def submit(email: str, cool: str, CoolScale: int):
# Validates all fields in the form
errors = {'email': validate_email(email),
'cool': validate_cool(cool),
'coolscale': validate_coolscale(CoolScale) }
# Removes the None values from the errors dictionary (No errors)
errors = {k: v for k, v in errors.items() if v is not None}
# Return Button with error message if they exist
return Div(id='submit-btn-container')(
Button(type='submit', id='submit-btn', post='submit', hx_target='#submit-btn-container', hx_swap='outerHTML')('Submit'),
*[Div(error, style='color: red;') for error in errors.values()])
########################
### Validation Logic ###
########################
def validate_email(email: str):
# Check if email address is a valid one
email_regex = r'\b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Z|a-z]{2,}\b'
if not re.match(email_regex, email): return "Please enter a valid email address"
# Check if email address is already taken (in this case only [email protected] will pass)
elif email != "[email protected]": return "That email is already taken. Please enter another email (only [email protected] will pass)."
# If no errors, return None (default of python)
def validate_cool(cool: str):
if cool.lower() not in ["yes", "definitely"]: return "Yes or definitely are the only correct answers"
def validate_coolscale(CoolScale: int):
if CoolScale < 1 or CoolScale > 10: return "Please enter a number between 1 and 10"
######################
### HTML Templates ###
######################
def inputTemplate(label, name, val, errorMsg=None, input_type='text'):
# Generic template for replacing the input field and showing the validation message
return Div(hx_target='this', hx_swap='outerHTML', cls=f"{errorMsg if errorMsg else 'Valid'}")(
Label(label), # Creates label for the input field
Input(name=name,type=input_type,value=f'{val}',post=f'{name.lower()}'), # Creates input field
Div(f'{errorMsg}', style='color: red;') if errorMsg else None) # Creates red error message below if there is an error
</example>
<example name="Loading Indicator">
from fasthtml.common import *
from monsterui.all import *
import asyncio
app, rt = fast_app(hdrs=Theme.blue.headers())
@rt
def index():
return Titled("Loading Demo",
# Button to trigger an HTMX request
Button("Load", id='load',
# Trigger HTMX request to add content to #content
get=load, hx_target='#content', hx_swap='beforeend',
# While request in flight, show loading indicator
hx_indicator='#loading'),
# A place to put content from request
Div(id='content'),
# Loading indicator ready for htmx use
# For more options see https://monsterui.answer.ai/api_ref/docs_loading
Loading(id='loading', htmx_indicator=True))
@rt
async def load():
# Sleep for a second to simulate a long request
await asyncio.sleep(1)
return P("Loading Demo")
serve()
</example>
<example name="Multi Image Upload">
from base64 import b64encode
from fasthtml.common import *
app, rt = fast_app()
@rt
def index():
inp = Card(
H3("Drag and drop images here", style="text-align: center;"),
# HTMX for uploading multiple images
Input(type="file",name="images", multiple=True, required=True,
# Call the upload route on change
post=upload, hx_target="#image-list", hx_swap="afterbegin", hx_trigger="change",
# encoding for multipart
hx_encoding="multipart/form-data",accept="image/*"),
# Make a nice border to show the drop zone
style="border: 2px solid #ccc; border-radius: 8px;",)
return Titled("Multi Image Upload",
inp,
H3("👇 Uploaded images 👇", style="text-align: center;"),
Div(id="image-list"))
async def ImageCard(image):
contents = await image.read()
# Create a base64 string
img_data = f"data:{image.content_type};base64,{b64encode(contents).decode()}"
# Create a card with the image
return Card(H4(image.filename), Img(src=img_data, alt=image.filename))
@rt
async def upload(images: list[UploadFile]):
# Create a grid filled with 1 image card per image
return Grid(*[await ImageCard(image) for image in images])
serve()
</example>
<example name="Progress Bar">
from fasthtml.common import *
import random
app, rt = fast_app()
def get_progress(percent_complete: int):
"Simulate progress check"
return percent_complete + random.random()/3
@rt
def index():
return (Div(H3("Start the job to see progress!"),id='progress_bar'),
Button("Start Job",post=update_status, hx_target="#progress_bar"))
@rt
def update_status():