help_text – Django 表单字段验证

Django 表单中的内置表单字段验证是为所有字段预定义的默认验证。每个字段都带有来自 Django 验证器的一些内置验证。每个 Field 类的构造函数都有一些固定的参数。

help_text参数允许您为该字段指定描述性文本。如果您提供 help_text，当 Field 由一种便利的 Form 方法呈现时，它将显示在 Field 旁边。字段的默认 help_text 为空。让我们检查一下如何在使用项目的字段中使用 help_text。

句法

field_name = models.Field(option = value)

Django 表单字段验证help_text解释

使用示例说明 help_text。考虑一个名为geeks的项目，它有一个名为geeksforgeeks的应用程序。

Refer to the following articles to check how to create a project and an app in Django.

• How to Create a Basic Project using MVT in Django?
• How to Create an App in Django ?

在geeks app的forms.py文件中输入以下代码。我们将使用 CharField 来试验所有字段选项。

from django import forms
  
class GeeksForm(forms.Form):
    geeks_field = forms.CharField(help_text = "Enter your Name")

将极客应用添加到INSTALLED_APPS

# Application definition
  
INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'geeks',
]

现在要将这个表单渲染到一个视图中，我们需要一个视图和一个映射到该视图的 URL。我们先在geeks app的views.py中创建一个视图，

from django.shortcuts import render
from .forms import GeeksForm
  
# Create your views here.
def home_view(request):
    context = {}
    form = GeeksForm(request.POST or None)
    context['form'] = form
    if request.POST:
        if form.is_valid():
            temp = form.cleaned_data.get("geeks_field")
            print(temp)
    return render(request, "home.html", context)

在这里，我们从 forms.py 导入该特定表单并在视图中创建它的对象，以便可以在模板中呈现它。
现在，要启动一个 Django 表单，您需要创建 home.html，在其中可以根据需要设计内容。让我们在home.html中创建一个表单。

    {% csrf_token %}
    {{ form }}
    

最后，在 urls.py 中映射到该视图的 URL

from django.urls import path
  
# importing views from views..py
from .views import home_view
  
URLpatterns = [
    path('', home_view ),
]

让我们运行服务器并检查实际发生了什么，运行

Python manage.py runserver

因此，使用 help_text “Enter your Name” 创建了一个geeks_field CharField 。

更多内置表单验证

Field Options	Description
required	By default, each Field class assumes the value is required, so to make it not required you need to set required=False
label	The label argument lets you specify the “human-friendly” label for this field. This is used when the Field is displayed in a Form.
label_suffix	The label_suffix argument lets you override the form’s label_suffix on a per-field basis.
widget	The widget argument lets you specify a Widget class to use when rendering this Field. See Widgets for more information.
help_text	The help_text argument lets you specify descriptive text for this Field. If you provide help_text, it will be displayed next to the Field when the Field is rendered by one of the convenience Form methods.
error_messages	The error_messages argument lets you override the default messages that the field will raise. Pass in a dictionary with keys matching the error messages you want to override.
validators	The validators argument lets you provide a list of validation functions for this field.
localize	The localize argument enables the localization of form data input, as well as the rendered output.
disabled.	The disabled boolean argument, when set to True, disables a form field using the disabled HTML attribute so that it won’t be editable by users.

在评论中写代码？请使用 ide.geeksforgeeks.org，生成链接并在此处分享链接。