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python - 用数据填充 WTForms FormField FieldList 会在字段中生成 HTML

转载 作者:IT老高 更新时间:2023-10-28 20:53:02 26 4
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我有一个 Flask 应用程序,我可以通过上传一个 CSV 文件来填充表单数据,然后读取该文件。我想用从 CSV 读取的数据填充一个 FieldList。但是,当我尝试填充数据时,它会将原始 HTML 输入到 TextField 中,而不仅仅是我想要的值。我做错了什么?

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>

有问题的代码片段发生在 classform.students.append_entry(studentform) 行。如果需要,我可以发布输出 HTML。我期望的是这样的: Expected Output我得到的是: enter image description here

最佳答案

好的,我花了好几个小时在这上面,最后它只是一个微不足道的代码更改。

大多数字段允许您通过修改 data 属性来更改它们的值(就像我在上面所做的那样)。事实上,在我的代码中,我有这样的评论:

    ### 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。

关于python - 用数据填充 WTForms FormField FieldList 会在字段中生成 HTML,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/29514798/

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