Python---The form component in Django (2) customizing properties and various validation of forms

Analysis Widget:

class Testform (forms. Form):    = Fields . Charfield (            = True,            = widgets. TextInput ()    )

Tracking widgets.py

__all__ = (    'Media','Mediadefiningclass','Widgets','TextInput','Numberinput',    'EmailInput','Urlinput','Passwordinput','Hiddeninput',    'Multiplehiddeninput','FileInput','Clearablefileinput','Textarea',    'Dateinput','Datetimeinput','Timeinput','Checkboxinput','Select',    'Nullbooleanselect','Selectmultiple','Radioselect',    'Checkboxselectmultiple','Multiwidget','Splitdatetimewidget',    'Splithiddendatetimewidget','Selectdatewidget',)

All Controls

class TextInput (Input):     ' text ' ' django/forms/widgets/text.html'  #模板html存放路径      

To trace the parent class:

classInput (Widget):"""Baseclass  forAll <input>widgets. """Input_type = None # subclasses must define This. Template_name='django/forms/widgets/input.html'def __init__ (self, attrs=None): #发现这里又参数attrs可以设置属性ifAttrs isNot none:attrs=attrs.copy () Self.input_type= Attrs.pop ('type', Self.input_type) super (input, self). __init__ (ATTRS) def get_context (self, name, value, attrs): cont Ext=Super (Input, self). Get_context (name, value, attrs) context['Widgets']['type'] =Self.input_typereturnContext

Found template file Template_name = ' django/forms/widgets/input.html ', actually does not exist, is called the parent class method

classWidget (Six.with_metaclass (Renamewidgetmethods)): Def get_context (self, name, value, Attrs): Context={} context['Widgets'] = {            'name': Name,'Is_hidden': Self.is_hidden,'Required': self.is_required,'value': Self.format_value (value),'Attrs': Self.build_attrs (Self.attrs, attrs),'Template_name': Self.template_name,}returnContext def render (self, name, value, Attrs=none, renderer=None):"""        Returns this Widget rendered as HTML, as a Unicode string. #生成对于html代码, return to use"""Context =self.get_context (name, value, Attrs)returnSelf._render (self.template_name, Context, renderer) def _render (self, template_name, context, renderer=None):ifRenderer isNone:renderer=Get_default_renderer ()returnMark_safe (Renderer.render (template_name, context))

So we can customize the style, properties

widget = widgets. TextInput (attrs={"class": "C1"}), #这个属性, to create the desired style by setting it on the front end

Add: Generate native strings on the server and do not escape when front-end rendering is required

" <input type= ' text '/> " = Mark_safe (txt) #前端可以正常显示  

Select Radio Box:

sel_inp= fields. Choicefield (    = [(1,'a'), (2,'b' ) ),])

Select box:

SEL_INP = Fields . Charfield (        = widgets. Select (choices=[(1,'a'), (2,'b ' ),]))

Combo Multi-Select:

radio_inp= fields. Multiplechoicefield (    = [(1,'a'), (2,'b ' ),]   #含有multiple时可以写在外, can also be written in, here is recommended    outside = widgets. Selectmultiple (attrs={'class':"C1"})) 

Radio checkbox:

    CHK_INP = Fields . Charfield (        = widgets. Checkboxinput ()    )

Multi-Select checkbox

    MCHK_INP = Fields . Multiplechoicefield (        = widgets. Checkboxselectmultiple (),        choices=[(1"D"), (2" e "), (3,'r')],        = [2,3 ]    )

Radio Radio:

    RAD_INP = Fields . Choicefield (        choices=[(1," male "), (2," female " ),],        initial=2,        =widgets. Radioselect (),    )

Fields are used to hold regular expressions, and HTML plugins are used to produce HTML tags (input)

Python---The form component in Django (2) customizing properties and various validation of forms