flask-wtforms必填字段 [英] flask-wtforms field required

问题描述

如何在此烧瓶代码上添加所需的标签:

how i can add tag required on this flask code :

{{ form.youtube_href(type='url', class='form-control') }}

实际输出为:

<input class="form-control" id="youtube_href" name="youtube_href" value="" type="url">

需要此输出bat给出错误:

need this output bat give error :

<input class="form-control" id="youtube_href" name="youtube_href" value="" type="url" required>

我尝试过这个蝙蝠给错误:

im tried this bat give error :

{{ form.youtube_href(type='url', class='form-control', 'required') }}

推荐答案

从WTForms 2.2(2018年6月2日)开始，如果字段具有设置了required标志的验证器，则字段现在呈现required属性.作为DataRequired和InputRequired.如果由于某种原因您不想渲染该属性，则可以传递required=False.或者，如果要禁用所有浏览器验证，则可以在form标记中设置novalidate属性.通常，您应该宁愿使浏览器验证保持启用状态，因为这会阻止对简单验证的请求/响应，这是合乎需要的.

As of WTForms 2.2 (June 2nd, 2018), fields now render the required attribute if they have a validator that sets the required flag, such as DataRequired and InputRequired. If for some reason you don't want to render the attribute, you can pass required=False. Or if you want to disable all browser validation, you can set the novalidate attribute in the form tag. In general you should prefer to leave browser validation enabled, because it prevents a request/response for simple validation, which is desirable.

您在关键字参数之后传递了位置参数，这是一种语法错误.而是传递required=True，这将在标记上设置裸属性.检查字段上的标志，以查看是否设置了Required验证器:field.flags.required是布尔值.创建一个URLField而不是手动传递类型.

You are passing a positional argument after keyword arguments, which is a syntax error. Instead, pass required=True, which will set a bare attribute on the tag. Check the flags on a field to see if a Required validator was set: field.flags.required is a boolean. Create a URLField rather than passing the type manually.

from flask_wtf import Form
from wtforms.fields.html5 import URLField
from wtforms.validators import InputRequired

class MyForm(Form):
    youtube_href = URLField(validators=[InputRequired()])

form = MyForm()
print(form.youtube_href(required=form.youtube_href.flags.required))
# <input id="youtube_href" name="youtube_href" required type="url" value="">

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