组件

ft_html 和 ft_hx 函数为 ft 添加了一些便利功能，同时提供了一整套基础的 HTML 组件，以及用于处理表单和 FT 转换的函数。

from collections import UserDict
from lxml import html as lx
from pprint import pprint

Str 和 repr

在 notebook 中，FT 组件会以语法高亮的 XML/HTML 形式渲染。

sentence = P(Strong("FastHTML is ", I("Fast")), id='sentence_id')
sentence

<p id="sentence_id">
<strong>FastHTML is <i>Fast</i></strong></p>

在其他地方，它们则以其底层数据结构的形式表示。

print(repr(sentence))

p((strong(('FastHTML is ', i(('Fast',),{})),{}),),{'id': 'sentence_id'})

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源代码

FT.__str__

 FT.__str__ ()

返回 str(self)。

如果组件有 id，那么该 id 将用作组件的 str 表示。

f'hx_target=#{sentence}'

'hx_target=#sentence_id'

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源代码

FT.__radd__

 FT.__radd__ (b)

'hx_target=#' + sentence

'hx_target=#sentence_id'

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源代码

FT.__add__

 FT.__add__ (b)

sentence + '...'

'sentence_id...'

fh_html 和 fh_hx

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源代码

attrmap_x

 attrmap_x (o)

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源代码

ft_html

 ft_html (tag:str, *c, id=None, cls=None, title=None, style=None,
          attrmap=None, valmap=None, ft_cls=None, **kwargs)

ft_html('a', **{'@click.away':1})

<a @click.away="1"></a>

ft_html('a', {'@click.away':1})

<a @click.away="1"></a>

ft_html('a', UserDict({'@click.away':1}))

<a @click.away="1"></a>

c = Div(id='someid')

ft_html('a', id=c)

<a id="someid" name="someid"></a>

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源代码

ft_hx

 ft_hx (tag:str, *c, target_id=None, hx_vals=None, hx_target=None,
        id=None, cls=None, title=None, style=None, accesskey=None,
        contenteditable=None, dir=None, draggable=None, enterkeyhint=None,
        hidden=None, inert=None, inputmode=None, lang=None, popover=None,
        spellcheck=None, tabindex=None, translate=None, hx_get=None,
        hx_post=None, hx_put=None, hx_delete=None, hx_patch=None,
        hx_trigger=None, hx_swap=None, hx_swap_oob=None, hx_include=None,
        hx_select=None, hx_select_oob=None, hx_indicator=None,
        hx_push_url=None, hx_confirm=None, hx_disable=None,
        hx_replace_url=None, hx_disabled_elt=None, hx_ext=None,
        hx_headers=None, hx_history=None, hx_history_elt=None,
        hx_inherit=None, hx_params=None, hx_preserve=None, hx_prompt=None,
        hx_request=None, hx_sync=None, hx_validate=None, hx_on_blur=None,
        hx_on_change=None, hx_on_contextmenu=None, hx_on_focus=None,
        hx_on_input=None, hx_on_invalid=None, hx_on_reset=None,
        hx_on_select=None, hx_on_submit=None, hx_on_keydown=None,
        hx_on_keypress=None, hx_on_keyup=None, hx_on_click=None,
        hx_on_dblclick=None, hx_on_mousedown=None, hx_on_mouseenter=None,
        hx_on_mouseleave=None, hx_on_mousemove=None, hx_on_mouseout=None,
        hx_on_mouseover=None, hx_on_mouseup=None, hx_on_wheel=None,
        hx_on__abort=None, hx_on__after_on_load=None,
        hx_on__after_process_node=None, hx_on__after_request=None,
        hx_on__after_settle=None, hx_on__after_swap=None,
        hx_on__before_cleanup_element=None, hx_on__before_on_load=None,
        hx_on__before_process_node=None, hx_on__before_request=None,
        hx_on__before_swap=None, hx_on__before_send=None,
        hx_on__before_transition=None, hx_on__config_request=None,
        hx_on__confirm=None, hx_on__history_cache_error=None,
        hx_on__history_cache_miss=None,
        hx_on__history_cache_miss_error=None,
        hx_on__history_cache_miss_load=None, hx_on__history_restore=None,
        hx_on__before_history_save=None, hx_on__load=None,
        hx_on__no_sse_source_error=None, hx_on__on_load_error=None,
        hx_on__oob_after_swap=None, hx_on__oob_before_swap=None,
        hx_on__oob_error_no_target=None, hx_on__prompt=None,
        hx_on__pushed_into_history=None, hx_on__replaced_in_history=None,
        hx_on__response_error=None, hx_on__send_abort=None,
        hx_on__send_error=None, hx_on__sse_error=None,
        hx_on__sse_open=None, hx_on__swap_error=None,
        hx_on__target_error=None, hx_on__timeout=None,
        hx_on__validation_validate=None, hx_on__validation_failed=None,
        hx_on__validation_halted=None, hx_on__xhr_abort=None,
        hx_on__xhr_loadend=None, hx_on__xhr_loadstart=None,
        hx_on__xhr_progress=None, **kwargs)

ft_hx('a', hx_vals={'a':1})

<a hx-vals='{"a": 1}'></a>

ft_hx('a', hx_target=c)

<a hx-target="#someid"></a>

对于具有 name 属性的标签，如果没有明确提供，它的值将被设置为 id 的值。

Form(Button(target_id='foo', id='btn'),
     hx_post='/', target_id='tgt', id='frm')

<form hx-post="/" hx-target="#tgt" id="frm" name="frm"><button hx-target="#foo" id="btn" name="btn"></button></form>

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源代码

文件

 File (fname)

直接使用文件 fname 中未经转义的文本。

a = Input(name='nm')
a

<input name="nm">

a(hx_swap_oob='true')

<input name="nm" hx-swap-oob="true">

a

<input name="nm" hx-swap-oob="true">

显示

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源代码

显示

 show (ft, *rest, iframe=False, height='auto', style=None)

在 Jupyter notebook 中将 FT 组件渲染为 HTML。

当放置在 show() 函数中时，这将在 Jupyter notebook 中渲染 HTML。

show(sentence)

FastHTML 是快速的

你也可以在 iframe 中显示完整的嵌入式页面。

picocss = "https://cdn.jsdelivr.net.cn/npm/@picocss/pico@latest/css/pico.min.css"
picolink = (Link(rel="stylesheet", href=picocss))

fullpage = Html(
    Head(picolink),
    Body(
        H2("Heading 2"),
        P("Paragraph")
    )
)

show(fullpage, height=100, iframe=True)

fill_form 和 find_inputs

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源代码

fill_form

 fill_form (form:fastcore.xml.FT, obj)

使用 obj 中的属性填充 form 中的命名项。

@dataclass
class TodoItem:
    title:str; id:int; done:bool; details:str; opt:str='a'

todo = TodoItem(id=2, title="Profit", done=True, details="Details", opt='b')
check = Label(Input(type="checkbox", cls="checkboxer", name="done", data_foo="bar"), "Done", cls='px-2')
form = Form(Fieldset(Input(cls="char", id="title", value="a"), check, Input(type="hidden", id="id"),
                     Select(Option(value='a'), Option(value='b'), name='opt'),
                     Textarea(id='details'), Button("Save"),
                     name="stuff"))
form = fill_form(form, todo)
assert '<textarea id="details" name="details">Details</textarea>' in to_xml(form)
form

<form><fieldset name="stuff">    <input value="Profit" id="title" class="char" name="title">
<label class="px-2">      <input type="checkbox" name="done" data-foo="bar" class="checkboxer" checked="1">
Done</label>    <input type="hidden" id="id" name="id" value="2">
<select name="opt"><option value="a"></option><option value="b" selected="1"></option></select><textarea id="details" name="details">Details</textarea><button>Save</button></fieldset></form>

@dataclass
class MultiSelect:
    items: list[str]

multiselect = MultiSelect(items=['a', 'c'])
multiform = Form(Select(Option('a', value='a'), Option('b', value='b'), Option('c', value='c'), multiple='1', name='items'))
multiform = fill_form(multiform, multiselect)
assert '<option value="a" selected="1">a</option>' in to_xml(multiform)
assert '<option value="b">b</option>' in to_xml(multiform)
assert '<option value="c" selected="1">c</option>' in to_xml(multiform)
multiform

<form><select multiple="1" name="items"><option value="a" selected="1">a</option><option value="b">b</option><option value="c" selected="1">c</option></select></form>

@dataclass
class MultiCheck:
    items: list[str]

multicheck = MultiCheck(items=['a', 'c'])
multiform = Form(Fieldset(Label(Input(type='checkbox', name='items', value='a'), 'a'),
                          Label(Input(type='checkbox', name='items', value='b'), 'b'),
                          Label(Input(type='checkbox', name='items', value='c'), 'c')))
multiform = fill_form(multiform, multicheck)
assert '<input type="checkbox" name="items" value="a" checked="1">' in to_xml(multiform)
assert '<input type="checkbox" name="items" value="b">' in to_xml(multiform)
assert '<input type="checkbox" name="items" value="c" checked="1">' in to_xml(multiform)
multiform

<form><fieldset><label>      <input type="checkbox" name="items" value="a" checked="1">
a</label><label>      <input type="checkbox" name="items" value="b">
b</label><label>      <input type="checkbox" name="items" value="c" checked="1">
c</label></fieldset></form>

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源代码

fill_dataclass

 fill_dataclass (src, dest)

原地修改数据类并返回它。

nt = TodoItem('', 0, False, '')
fill_dataclass(todo, nt)
nt

TodoItem(title='Profit', id=2, done=True, details='Details', opt='b')

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源代码

find_inputs

 find_inputs (e, tags='input', **kw)

在 e 中递归查找所有标签为 tags 且属性与 kw 匹配的元素。

inps = find_inputs(form, id='title')
test_eq(len(inps), 1)
inps

[input((),{'value': 'Profit', 'id': 'title', 'class': 'char', 'name': 'title'})]

你也可以使用 lxml 进行更复杂的搜索。

elem = lx.fromstring(to_xml(form))
test_eq(elem.xpath("//input[@id='title']/@value"), ['Profit'])

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源代码

getattr

 __getattr__ (tag)

html2ft

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源代码

html2ft

 html2ft (html, attr1st=False)

将 HTML 转换为 ft 表达式。

h = to_xml(form)
hl_md(html2ft(h), 'python')

Form(
    Fieldset(
        Input(value='Profit', id='title', name='title', cls='char'),
        Label(
            Input(type='checkbox', name='done', data_foo='bar', checked='1', cls='checkboxer'),
            'Done',
            cls='px-2'
        ),
        Input(type='hidden', id='id', name='id', value='2'),
        Select(
            Option(value='a'),
            Option(value='b', selected='1'),
            name='opt'
        ),
        Textarea('Details', id='details', name='details'),
        Button('Save'),
        name='stuff'
    )
)

hl_md(html2ft(h, attr1st=True), 'python')

Form(
    Fieldset(name='stuff')(
        Input(value='Profit', id='title', name='title', cls='char')(),
        Label(cls='px-2')(
            Input(type='checkbox', name='done', data_foo='bar', checked='1', cls='checkboxer')(),
            'Done'
        ),
        Input(type='hidden', id='id', name='id', value='2')(),
        Select(name='opt')(
            Option(value='a')(),
            Option(value='b', selected='1')()
        ),
        Textarea(id='details', name='details')('Details'),
        Button()('Save')
    )
)

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源代码

sse_message

 sse_message (elm, event='message')

将元素 elm 转换为适合 SSE 流式传输的格式。

print(sse_message(Div(P('hi'), P('there'))))

event: message
data: <div>
data:   <p>hi</p>
data:   <p>there</p>
data: </div>

测试

test_html2ft('<input value="Profit" name="title" id="title" class="char">', attr1st=True)
test_html2ft('<input value="Profit" name="title" id="title" class="char">')
test_html2ft('<div id="foo"></div>')
test_html2ft('<div id="foo">hi</div>')
test_html2ft('<div x-show="open" x-transition:enter="transition duration-300" x-transition:enter-start="opacity-0 scale-90">Hello 👋</div>')
test_html2ft('<div x-transition:enter.scale.80 x-transition:leave.scale.90>hello</div>')

assert html2ft('<div id="foo">hi</div>', attr1st=True) == "Div(id='foo')('hi')"
assert html2ft('<div id="foo" hidden>hi</div>', attr1st=True) == "Div(id='foo', hidden=True)('hi')"
assert html2ft("""
  <div x-show="open" x-transition:enter="transition duration-300" x-transition:enter-start="opacity-0 scale-90">Hello 👋</div>
""") == "Div('Hello 👋', x_show='open', **{'x-transition:enter': 'transition duration-300', 'x-transition:enter-start': 'opacity-0 scale-90'})"
assert html2ft('<div x-transition:enter.scale.80 x-transition:leave.scale.90>hello</div>') == "Div('hello', **{'x-transition:enter.scale.80': True, 'x-transition:leave.scale.90': True})"
assert html2ft("<img alt=' ' />") == "Img(alt=' ')"

“## 导出 -