flask-wtforms中的TextField即使在输入日期后也会返回一个空字符串

我使用包含TextField和DateField的烧瓶wtforms创建了一个表单。这是我的表单类：

class SubmitReportForm(Form):
    projectName=TextField('Name of Project', [Required('Please enter name of the project')])
    workDone=TextAreaField('work', [Required('Please state your progress')])
    fromDate=DateField('fromDate', [Required('Please mention a start date')])
    toDate=DateField('toDate', [Required('Please mention an end date')])
    submit=SubmitField('Submit')

我处理此表单的视图函数是：

@app.route('/user/<userName>/submit', methods=['GET', 'POST'])
@login_required
def submit(userName):
    form=SubmitReportForm()
    if request.method=='GET' :
        return render_template("submit.html", userName=userName, form=form)
    elif request.method =='POST' :
        if form.is_submitted():
            print 'submitted'
            if form.validate():
                print 'validated'
            print form.errors
            if form.validate_on_submit():
                project=form.projectName.data
                fromDate=form.fromDate.data
                toDate=form.toDate.data
                progress=form.workDone.data
                report=writeToFile(current_user.userName, project, fromDate, toDate, progress)
                recipient=['blah@blah.com']
                subject="Monthly report by : " + current_user.userName
                msg = Message(subject, sender =(current_user.userName, 'blah@blah.com'), recipients = recipient)
                msg.body= "Please find the attached report by "+ current_user.userName
                with app.open_resource(report.name) as fp:
                    msg.attach(report.name, "text/plain", fp.read())
                mail.send(msg)
                return render_template('successSubmit.html')
    else:
        flash(u'Please fill all the fields', 'error')
        return render_template("submit.html", userName=userName, form=form)

现在，当我单击提交按钮时，form.validate_on_submit（）总是返回 false。经过一些调试，我发现表单已提交但未验证，因为即使在表单中输入日期后，form.fromDate.data 也始终返回 None 类型对象。

我的 HTML 文件：

{% extends 'base.html' %}
{% block content %}
    {% with messages = get_flashed_messages() %}
        {% if messages %}
            {% for message in messages %}
                <p><span style="color: red;">{{ message }}</span></p>
            {% endfor %}
        {% endif %}
    {% endwith %}
    <form action ='{{url_for('submit', userName=userName)}}' method='POST'>
        {{form.hidden_tag()}}
        <p>
            Project Name: {{form.projectName}}
        </p>
        <br>
        <p>
            <label>Start Date : </label>  {{form.fromDate}}
        </p>
        <br>
        <p>
            <label>End Date : </label>  {{form.toDate}}
        </p>
        <br>
        <p>
            Progress Done: {{form.workDone(style="width: 699px; height: 297px;")}} 
        </p>
        <br>
        <p>
            <input type='submit' value='Send Report'>
        </p>
        <br>
    </form>
{% endblock %}

即使我使用文本字段代替日期字段，我也会得到一个空字符串。所以请告诉我我哪里出错了？？提前感谢。

以下代码应该很有用：

from flask import Flask, render_template, request
from wtforms import Form
from wtforms.fields import DateField
from wtforms.validators import Required

app = Flask(__name__)
app.config['DEBUG'] = True

class TestForm(Form):
    foo_date = DateField('Foo Date',
                         [Required('Foo Date is required')],
                         format='%Y-%m-%d',
                         description='Date format: YYYY-MM-DD')
@app.route("/", methods=['GET', 'POST'])
def index():
    submitted_date = None
    if request.method == 'POST':
        form = TestForm(request.form) # PAY ATTENTION HERE
        if form.validate():
            submitted_date = form.foo_date.data
    else:
        form = TestForm()
    return render_template('tpl.html', form=form, submitted_date=submitted_date)

if __name__ == "__main__":
    app.run()

模板 tpl.html（在"模板"文件夹中）：

<!DOCTYPE html>
<html>
<body>
<form method='POST' action=''>
    <p>{{ form.foo_date.label }}: {{ form.foo_date }} {{ form.foo_date.description }}</p>
    <input type='submit' value='Send foo date'>
</form>
{% if submitted_date %}
<p style="color: green">You submitted successfully the following date: {{ submitted_date }}</p>
{% endif %}
{% if form.errors %}
<h2>Errors</h2>
<p style="color: red">{{ form.errors }}</p>
{% endif %}
</body>
</html>

请注意，当请求方法是 POST 时，您没有正确初始化表单类（请参阅我的代码）。

您的模板中是否有{{ form.csrf_token }}（您可以将其放在form中）。试一试，也许可以工作...如果你已经完成了，那么...我刚刚遇到了一个问题，它是由 CSRF 引起的，所以我添加了这个变量并且它起作用了。

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