Python 3.x 当验证器条件不满足时,为什么wtforms不生成错误?
所以我正在研究一个表单,它有两个输入和一个检查条件。如果不满足检查条件,则引发错误。否则取db中的值。 下面是我的Python 3.x 当验证器条件不满足时,为什么wtforms不生成错误?,python-3.x,flask-sqlalchemy,flask-wtforms,Python 3.x,Flask Sqlalchemy,Flask Wtforms,所以我正在研究一个表单,它有两个输入和一个检查条件。如果不满足检查条件,则引发错误。否则取db中的值。 下面是我的forms.py脚本 from flask_wtf import FlaskForm from wtforms import StringField, SubmitField, validators # Define QuoteForm below class QuoteForm(FlaskForm): # qauthor = StringField("Quote A
forms.py
脚本
from flask_wtf import FlaskForm
from wtforms import StringField, SubmitField, validators
# Define QuoteForm below
class QuoteForm(FlaskForm):
# qauthor = StringField("Quote Author",[validators.DataRequired(message="This field is required"),validators.Length(min =3, max =100,message = "Field must be between 3 and 100 characters long.")])
qauthor = StringField("Quote Author",validators=[validators.DataRequired(message="This field is required"),validators.Length(min =3, max =100,message = "Field must be between 3 and 200 characters long.")])
qstring = StringField("Quote",validators=[validators.DataRequired(message="This field is required"),validators.Length(min =3, max =200,message = "Field must be between 3 and 200 characters long.")])
submit = SubmitField(" Add Quote")
如您所见,两个文件的最小长度都应大于3。
我还在HTML页面addquote.HTML
<body>
<h2>QuoteForm</h2>
<form action="", method="post">
<p>
{{form.qauthor.label}} : {{form.qauthor}}<br>
{%for error in form.qauthor.errors%}
<span style="color: red;">[{{ error }}]</span><br>
{% endfor %}
</p>
<p>
{{form.qstring.label}} : {{form.qstring}}<br>
{%for error in form.qstring.errors%}
<span style="color: red;">[{{ error }}]</span><br>
{% endfor %}
</p>
<p>{{form.submit}}</p>
</form>
</body>
- 现在我传递的输入是引述作者:“在”和引述作者:“这是一个美丽的世界”
- 引用作者:“AT”和引用作者:“RT”
flask=='1.0.2'您需要调用表单的
validate()
方法。通过调用validate\u on\u submit()
,可以更方便地完成此操作,这是检查活动请求是否提交(POST、PUT、PATCH或DELETE)以及表单数据是否有效的快捷方式()
下面是简单的完整示例代码,没有数据库,只是打印出表单的数据
app.py
from flask import Flask, render_template, url_for
from flask_wtf import FlaskForm
from markupsafe import Markup
from wtforms import StringField, SubmitField, validators
class QuoteForm(FlaskForm):
author = StringField(
"Quote Author",
validators=[
validators.DataRequired(message="This field is required"),
validators.Length(min=3, max=100, message="Field must be between 3 and 200 characters long.")
]
)
quote = StringField(
"Quote",
validators=[
validators.DataRequired(message="This field is required"),
validators.Length(min=3, max=200, message="Field must be between 3 and 200 characters long.")
]
)
submit = SubmitField(" Add Quote")
app = Flask(__name__)
app.config['SECRET_KEY'] = 'MY SECRET KEY'
@app.route('/', methods=['GET'])
def index():
_quote_url = url_for('add_quote')
return Markup(f'<a href="{_quote_url}">Add Quote</a')
@app.route('/add-quote/', methods=['GET', 'POST'])
def add_quote():
form = QuoteForm()
if form.validate_on_submit():
print(f'Author: {form.author.data}')
print(f'Quote: {form.quote.data}')
return "Quote form is validated"
return render_template("add-quote.html", form=form)
if __name__ == '__main__':
app.run()
从烧瓶导入烧瓶,呈现模板,url
来自flask_wtf进口FlaskForm
从markupsafe导入标记
从wtforms导入StringField、SubmitField和validators
等级报价表(烧瓶形式):
作者=StringField(
“引用作者”,
验证器=[
validators.DataRequired(message=“此字段为必填项”),
validators.Length(最小值=3,最大值=100,message=“字段长度必须介于3到200个字符之间。”)
]
)
quote=StringField(
“引用”,
验证器=[
validators.DataRequired(message=“此字段为必填项”),
validators.Length(最小值=3,最大值=200,message=“字段长度必须介于3到200个字符之间。”)
]
)
提交=提交字段(“添加报价”)
app=烧瓶(名称)
app.config['SECRET_KEY']='MY SECRET KEY'
@app.route('/',方法=['GET'])
def index():
_quote\u url=url\u for('add\u quote'))
返回标记(f'Add Quote表单验证成功。正在进行检查。问题是,现在程序没有使用您提供的代码执行if条件。是的,我已经删除了断点。还使用if块内的一些打印语句进行了检查。if块不执行。@DanishXavier-您没有将csrf_令牌
包含在表单中。我已经添加了一个简单的完整示例(我已经更改了一些变量名)。没有。我是这个wtf表单的新手。是否需要添加csrf_令牌?@DanishXavier-因为您从FlaskForm
csrf令牌字段(csrf_令牌
)继承了您的表单正在自动生成,您必须将其包含在表单的HTML中,否则在验证特定表单字段之前验证将失败。请尝试在HTML中注释出csrf_标记
,然后提交报价,您将看到一条关于csrf的错误消息。@DanishXavier-参见此。
@app.route('/addquote/', methods=['GET', 'POST'])
def add_quote():
form = QuoteForm()
if form.validate_on_submit():
breakpoint()
add_tab = Quotes(quoteauthor=form.qqauthor.data, quotestring=form.qqstring.data)
db.session.add(add_tab)
db.session.commit()
return render_template("addquote_confirmation.html")
return render_template("addquote.html",form=form)
from flask import Flask, render_template, url_for
from flask_wtf import FlaskForm
from markupsafe import Markup
from wtforms import StringField, SubmitField, validators
class QuoteForm(FlaskForm):
author = StringField(
"Quote Author",
validators=[
validators.DataRequired(message="This field is required"),
validators.Length(min=3, max=100, message="Field must be between 3 and 200 characters long.")
]
)
quote = StringField(
"Quote",
validators=[
validators.DataRequired(message="This field is required"),
validators.Length(min=3, max=200, message="Field must be between 3 and 200 characters long.")
]
)
submit = SubmitField(" Add Quote")
app = Flask(__name__)
app.config['SECRET_KEY'] = 'MY SECRET KEY'
@app.route('/', methods=['GET'])
def index():
_quote_url = url_for('add_quote')
return Markup(f'<a href="{_quote_url}">Add Quote</a')
@app.route('/add-quote/', methods=['GET', 'POST'])
def add_quote():
form = QuoteForm()
if form.validate_on_submit():
print(f'Author: {form.author.data}')
print(f'Quote: {form.quote.data}')
return "Quote form is validated"
return render_template("add-quote.html", form=form)
if __name__ == '__main__':
app.run()
<body>
<h2>QuoteForm</h2>
<form action="" method="post">
{{ form.csrf_token }}
<p>
{% for error in form.errors %}
<span style="color: red;">[{{ error }}]</span><br>
{% endfor %}
</p>
<p>
{{ form.author.label }} : {{ form.author }}<br>
{% for error in form.author.errors %}
<span style="color: red;">[{{ error }}]</span><br>
{% endfor %}
</p>
<p>
{{ form.quote.label }} : {{ form.quote }}<br>
{% for error in form.quote.errors %}
<span style="color: red;">[{{ error }}]</span><br>
{% endfor %}
</p>
<p>{{ form.submit }}</p>
</form>
</body>