我在同一页面上有多种形式,可以将发信请求发送到烧瓶中的同一处理程序。
我正在使用wtforms生成表单。
确定提交哪种表格的最佳方法是什么?
我目前正在使用action="?form=oneform"
。我认为应该有一些更好的方法来实现相同目标?
Answers:
上面的解决方案有一个验证错误,当一种形式导致验证错误时,两种形式都显示一条错误消息。我更改了if
解决此问题的顺序。
首先,SubmitField
使用不同的名称定义多个,例如:
class Form1(Form):
name = StringField('name')
submit1 = SubmitField('submit')
class Form2(Form):
name = StringField('name')
submit2 = SubmitField('submit')
....
然后在中添加一个过滤器view.py
:
....
form1 = Form1()
form2 = Form2()
....
if form1.submit1.data and form1.validate(): # notice the order
....
if form2.submit2.data and form2.validate(): # notice the order
....
现在问题解决了。
如果您想深入了解它,请继续阅读。
这里是validate_on_submit()
:
def validate_on_submit(self):
"""
Checks if form has been submitted and if so runs validate. This is
a shortcut, equivalent to ``form.is_submitted() and form.validate()``
"""
return self.is_submitted() and self.validate()
这里是is_submitted()
:
def is_submitted():
"""Consider the form submitted if there is an active request and
the method is ``POST``, ``PUT``, ``PATCH``, or ``DELETE``.
"""
return _is_submitted() # bool(request) and request.method in SUBMIT_METHODS
调用时form.validate_on_submit()
,无论单击哪个提交按钮,它都会检查表单是否通过HTTP方法提交。因此,上面的小技巧只是添加一个过滤器(检查提交是否有数据,即form1.submit1.data
)。
此外,我们更改的顺序if
,因此,当我们单击一个提交时,它仅调用validate()
此表单,从而防止了两种表单的验证错误。
故事还没有结束。这里是.data
:
@property
def data(self):
return dict((name, f.data) for name, f in iteritems(self._fields))
它返回一个具有字段名(键)和字段数据(值)的字典,但是,我们的两个表单提交按钮具有相同的名称submit
(键)!
当我们单击第一个提交按钮(在form1中)时,来自的调用将form1.submit1.data
返回一个类似这样的字典:
temp = {'submit': True}
毫无疑问,当我们打电话时if form1.submit.data:
,它会返回True
。
当我们单击第二个提交按钮(在form2中)时,对.data
in的调用首先if form1.submit.data:
在dict中添加键值,然后从中调用添加另一个键值,最后,该dict将如下所示:if form2.submit.data:
temp = {'submit': False, 'submit': True}
现在我们调用if form1.submit.data:
,True
即使我们单击的提交按钮位于form2中,它也会返回。
这就是为什么我们需要SubmitField
使用不同的名称来定义这两个。顺便说一句,感谢您的阅读(到这里)!
还有一种在一页上处理多种形式的方法。您可以使用多个视图来处理表单。例如:
...
@app.route('/')
def index():
register_form = RegisterForm()
login_form = LoginForm()
return render_template('index.html', register_form=register_form, login_form=login_form)
@app.route('/register', methods=['POST'])
def register():
register_form = RegisterForm()
login_form = LoginForm()
if register_form.validate_on_submit():
... # handle the register form
# render the same template to pass the error message
# or pass `form.errors` with `flash()` or `session` then redirect to /
return render_template('index.html', register_form=register_form, login_form=login_form)
@app.route('/login', methods=['POST'])
def login():
register_form = RegisterForm()
login_form = LoginForm()
if login_form.validate_on_submit():
... # handle the login form
# render the same template to pass the error message
# or pass `form.errors` with `flash()` or `session` then redirect to /
return render_template('index.html', register_form=register_form, login_form=login_form)
在模板(index.html)中,您需要呈现两个表单并将action
属性设置为目标视图:
<h1>Register</h1>
<form action="{{ url_for('register') }}" method="post">
{{ register_form.username }}
{{ register_form.password }}
{{ register_form.email }}
</form>
<h1>Login</h1>
<form action="{{ url_for('login') }}" method="post">
{{ login_form.username }}
{{ login_form.password }}
</form>
我一直在使用两个烧瓶片段的组合。首先将前缀添加到表单,然后使用validate_on_submit()检查前缀。我还使用LouisRoché的模板来确定在表单中按下了哪些按钮。
引用丹·雅各布:
例:
form1 = FormA(prefix="form1")
form2 = FormB(prefix="form2")
form3 = FormC(prefix="form3")
然后,添加一个隐藏字段(或仅检查提交字段):
if form1.validate_on_submit() and form1.submit.data:
引用LouisRoché的话:
我的模板中有:
<input type="submit" name="btn" value="Save">
<input type="submit" name="btn" value="Cancel">
为了找出服务器端通过了哪个按钮,我在views.py文件中有:
if request.form['btn'] == 'Save':
something0
else:
something1
一种简单的方法是为不同的提交字段使用不同的名称。例如:
表格.py:
class Login(Form):
...
login = SubmitField('Login')
class Register(Form):
...
register = SubmitField('Register')
views.py:
@main.route('/')
def index():
login_form = Login()
register_form = Register()
if login_form.validate_on_submit() and login_form.login.data:
print "Login form is submitted"
elif register_form.validate_on_submit() and register_form.register.data:
print "Register form is submitted"
...
if login.validate_on_submit() and login_form.login.data:
应该是if login_form.validate_on_submit() and login_form.login.data:
SubmitField('textHere')
指定'textHere'是<form>标记的name属性的值吗?像这样:<form name='Login'>
对应于SubmitField('Login')
。
作为其他答案,我还为页面上的每个表单的每个提交按钮分配了唯一的名称。
然后,flask Web操作如下所示-注意formdata
和obj
参数,它们有助于相应地初始化/保留表单字段:
@bp.route('/do-stuff', methods=['GET', 'POST'])
def do_stuff():
result = None
form_1 = None
form_2 = None
form_3 = None
if "submit_1" in request.form:
form_1 = Form1()
result = do_1(form_1)
elif "submit_2" in request.form:
form_2 = Form2()
result = do_2(form_2)
elif "submit_3" in request.form:
form_3 = Form3()
result = do_3(form_3)
if result is not None:
return result
# Pre-populate not submitted forms with default data.
# For the submitted form, leave the fields as they were.
if form_1 is None:
form_1 = Form1(formdata=None, obj=...)
if form_2 is None:
form_2 = Form2(formdata=None, obj=...)
if form_3 is None:
form_3 = Form3(formdata=None, obj=...)
return render_template("page.html", f1=form_1, f2=form_2, f3=form_3)
def do_1(form):
if form.validate_on_submit():
flash("Success 1")
return redirect(url_for(".do-stuff"))
def do_2(form):
if form.validate_on_submit():
flash("Success 2")
return redirect(url_for(".do-stuff"))
def do_3(form):
if form.validate_on_submit():
flash("Success 3")
return redirect(url_for(".do-stuff"))
form not "clicked" being ignored/dead/not interfering
。谢谢!
好吧,这是一个简单的把戏
假设你有
Form1,Form2和索引
Form1 <form method="post" action="{{ url_for('index',formid=1) }}">
Form2 <form method="post" action="{{ url_for('index',formid=2) }}">
现在索引
@bp.route('/index', methods=['GET', 'POST'])
def index():
formid = request.args.get('formid', 1, type=int)
if formremote.validate_on_submit() and formid== 1:
return "Form One"
if form.validate_on_submit() and formid== 2:
return "Form Two"
我没有使用WTForms,但是无论如何都可以工作。这是一个非常快速和简单的答案。您需要做的就是为“提交”按钮使用不同的值。然后,您可以根据每个参数进行不同的定义。
在index.html中:
<div>
<form action="{{ url_for('do_stuff')}}" method="POST">
<h1>Plus</h1>
<input type = "number" id = "add_num1" name = "add_num1" required><label>Number 1</label><br>
<input type = "number" id = "add_num2" name = "add_num2" required><label>Number 2</label><br>
<input type = "submit" value = "submit_add" name = "submit" ><br>
</form>
<p>Answer: {{ add }}</p>
</div>
<div>
<form action="{{ url_for('do_stuff')}}" method="POST">
<h1>Minus</h1>
<input type = "number" id = "min_num1" name = "min_num1" required><label>Number 1</label><br>
<input type = "number" id = "min_num2" name = "min_num2" required><label>Number 2</label><br>
<input type = "submit" value = "submit_min" name = "submit"><br>
</form>
<p>Answer: {{ minus }}</p>
</div>
在app.py中:
@app.route('/',methods=["POST"])
def do_stuff():
if request.method == 'POST':
add = ""
minus = ""
if request.form['submit'] == 'submit_add':
num1 = request.form['add_num1']
num2 = request.form['add_num2']
add = int(num1) + int(num2)
if request.form['submit'] == 'submit_min':
num1 = request.form['min_num1']
num2 = request.form['min_num2']
minus = int(num1) - int(num2)
return render_template('index.html', add = add, minus = minus)
示例:单个html页面中有多个WTForm
app.py
"""
Purpose Create multiple form on single html page.
Here we are having tow forms first is Employee_Info and CompanyDetails
"""
from flask import Flask, render_template, request
from flask_wtf import FlaskForm
from wtforms import StringField, IntegerField, FloatField, validators
from wtforms.validators import InputRequired
app = Flask(__name__)
app.config['SECRET_KEY'] = 'Thisisasecret'
class EmployeeInfo(FlaskForm):
"""
EmployeeInfo class will have Name,Dept
"""
fullName = StringField('Full Name',[validators.InputRequired()])
dept = StringField('Department',[validators.InputRequired()])
class CompanyDetails(FlaskForm):
"""
CompanyDetails will have yearOfExp.
"""
yearsOfExp = IntegerField('Year of Experiece',[validators.InputRequired()])
@app.route('/', methods = ['GET','POST'] )
def index():
"""
View will render index.html page.
If form is validated then showData.html will load the employee or company data.
"""
companydetails = CompanyDetails()
employeeInfo = EmployeeInfo()
if companydetails.validate_on_submit():
return render_template('showData.html', form = companydetails)
if employeeInfo.validate_on_submit():
return render_template('showData.html', form1 = employeeInfo)
return render_template('index.html',form1 = employeeInfo, form = companydetails)
if __name__ == '__main__':
app.run(debug= True, port =8092)
templates / index.html
<html>
<head>
</head>
<body>
<h4> Company Details </h4>
<form method="POST" action="{{url_for('index')}}">
{{ form.csrf_token }}
{{ form.yearsOfExp.label }} {{ form.yearsOfExp }}
<input type="submit" value="Submit">
</form>
<hr>
<h4> Employee Form </h4>
<form method="POST" action="{{url_for('index')}}" >
{{ form1.csrf_token }}
{{ form1.fullName.label }} {{ form1.fullName }}
{{ form1.dept.label }} {{ form1.dept }}
<input type="submit" value="Submit">
</form>
</body>
</html>
showData.html
<html>
<head>
</head>
<body>
{% if form1 %}
<h2> Employee Details </h2>
{{ form1.fullName.data }}
{{ form1.dept.data }}
{% endif %}
{% if form %}
<h2> Company Details </h2>
{{ form.yearsOfExp.data }}
{% endif %}
</body>
</html>
我通常使用隐藏标签作为标识符。
这是一个例子:
class Form1(Form):
identifier = StringField()
name = StringField('name')
submit = SubmitField('submit')
class Form2(Form):
identifier = StringField()
name = StringField('name')
submit = SubmitField('submit')
然后,您可以在view.py中添加一个过滤器:
....
form1 = Form1()
form2 = Form2()
....
if form1.identifier.data == 'FORM1' and form1.validate_on_submit():
....
if form2.identifier.data == 'FORM2' and form2.validate_on_submit():
....
最后是HTML:
<form method="POST">
{{ form1.indentifier(hidden=True, value='FORM1') }}
</form>
<form method="POST">
{{ form2.indentifier(hidden=True, value='FORM2') }}
</form>
如果您在if语句中这样做,它将检查标识符是什么,如果相等,它将运行代码中包含的表单内容。
methods=['POST']
似乎丢失了@app.route
)