用数据填充WTForms FormField FieldList会在字段中产生HTML
亚伦·D
我有一个Flask应用程序，可以在其中通过上载CSV文件来填充表单数据，然后读取该文件。我想用从CSV读取的数据填充FieldList。但是，当我尝试填充数据时，它将原始HTML输入到TextFields中，而不仅仅是我想要的值。我究竟做错了什么？
app.py
from flask import Flask, render_template, request, url_for
from flask.ext.wtf import Form
from wtforms import StringField, FieldList, FormField, SelectField
from wtforms.validators import DataRequired
from werkzeug.datastructures import MultiDict
app = Flask(__name__)
app.config['SECRET_KEY']='asdfjlkghdsf'
# normally student data is read in from a file uploaded, but for this demo we use dummy data
student_info=[("123","Bob Jones"),("234","Peter Johnson"),("345","Carly Everett"),
("456","Josephine Edgewood"),("567","Pat White"),("678","Jesse Black")]
class FileUploadForm(Form):
pass
class StudentForm(Form):
student_id = StringField('Student ID', validators = [DataRequired()])
student_name = StringField('Student Name', validators = [DataRequired()])
class AddClassForm(Form):
name = StringField('classname', validators=[DataRequired()])
day = SelectField('classday',
choices=[(1,"Monday"),(2,"Tuesday"),(3,"Wednesday"),(4,"Thursday"),(5,"Friday")],
coerce=int)
students = FieldList(FormField(StudentForm), min_entries = 5) # show at least 5 blank fields by default
@app.route('/', methods=['GET', 'POST'])
def addclass():
fileform = FileUploadForm()
classform = AddClassForm()
# Check which 'submit' button was called to validate the correct form
if 'addclass' in request.form and classform.validate_on_submit():
# Add class to DB - not relevant for this example.
return redirect(url_for('addclass'))
if 'upload' in request.form and fileform.validate_on_submit():
# get the data file from the post - not relevant for this example.
# overwrite the classform by populating it with values read from file
classform = PopulateFormFromFile()
return render_template('addclass.html', classform=classform)
return render_template('addclass.html', fileform=fileform, classform=classform)
def PopulateFormFromFile():
classform = AddClassForm()
# normally we would read the file passed in as an argument and pull data out,
# but let's just use the dummy data from the top of this file, and some hardcoded values
classform.name.data = "Super Awesome Class"
classform.day.data = 4 # Thursday
# pop off any blank fields already in student info
while len(classform.students) > 0:
classform.students.pop_entry()
for student_id, name in student_info:
# either of these ways have the same end result.
#
# studentform = StudentForm()
# studentform.student_id.data = student_id
# studentform.student_name.data = name
#
# OR
student_data = MultiDict([('student_id',student_id), ('student_name',name)])
studentform = StudentForm(student_data)
classform.students.append_entry(studentform)
return classform
if __name__ == '__main__':
app.run(debug=True, port=5001)
templates / addclass.html
<html>
<head>
<title>Flask FieldList Demo</title>
</head>
<body>
<h1>Add Class</h1>
{% if fileform %}
<div>
<p>Add class from file:</p>
<form action="" method="post" enctype="multipart/form-data" name="fileform">
{{ fileform.hidden_tag() }}
<p><input type="submit" name="upload" value="Upload"></p>
</form>
</div>
<hr>
{% endif %}
<div>
<form action="" method="post" name="classform">
{{ classform.hidden_tag() }}
Class Name: {{ classform.name }}<br>
Day: {{ classform.day }}<br>
<br>
<div>
<table>
<tr>
<th> Student Number </th>
<th> Name </th>
</tr>
{% for student in classform.students %}
<tr>
<td>{{ student.student_id }}</td>
<td>{{ student.student_name }}</td>
</tr>
{% endfor %}
</table>
</div>
<p><input type="submit" name="addclass" value="Add Class"></p>
</form>
</div>
</body>
</html>
令人反感的代码段在此行发生classform.students.append_entry(studentform)。如果需要，我可以发布输出HTML。我期望的是这样的：
我得到的是：
亚伦·D
好的，我花了几个小时来解决这个问题，最后这是一个微不足道的代码更改。
大多数字段都允许您通过修改data属性来更改其值（就像我上面所做的那样）。实际上，在我的代码中，我的注释如上所述：
### either of these ways have the same end result.
#
# studentform = StudentForm()
# studentform.student_id.data = student_id
# studentform.student_name.data = name
#
### OR
#
# student_data = MultiDict([('student_id',student_id), ('student_name',name)])
# studentform = StudentForm(student_data)
但是，对于FormFields的FieldList，我们不应编辑data属性，而应编辑字段本身。以下代码按预期工作：
for student_id, name in student_info:
studentform = StudentForm()
studentform.student_id = student_id # not student_id.data
studentform.student_name = name
classform.students.append_entry(studentform)
我希望这可以帮助遇到同样问题的人。
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