因此,我正在处理具有两个输入和一个检查条件的表单。如果不满足检查条件,则引发错误。否则取数据库中的值。
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 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")
您可以看到两个字段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>
我正在我的flask函数中调用表单。在下面给出。
@app.route('/addquote/', methods=['GET', 'POST'])
def add_quote():
form = QuoteForm()
if form.is_submitted():
breakpoint()
result = request.form
qqauthor = result['qauthor']
qqstring = result['qstring']
add_tab = Quotes(quoteauthor=qqauthor,quotestring=qqstring)
db.session.add(add_tab)
db.session.commit()
return render_template("addquote_confirmation.html")
return render_template("addquote.html",form=form)
在这两种情况下,我都未收到错误,因为我在forms.py中提到的最小长度为3。 为什么错误不会出现或验证没有发生? 依赖关系: flask_wtf =='0.14.3' flask =='1.0.2'
答案 0 :(得分:1)
您需要调用表单的validate()
方法。可以更方便地调用validate_on_submit()
,这是检查活动请求是否为提交(POST,PUT,PATCH或DELETE)和表单数据有效(see docs)的快捷方式。>
@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)
下面是简单的完整示例代码,没有数据库会打印出表单数据。
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()
add-quote.html
<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>