Python FileAllowed不显示错误消息
我用的是WT表格。我正在对文件上传进行验证,并将其限制为jpg、png和pdf格式。但是,如果输入错误,则不会显示错误消息 我遵循了这个教程Python FileAllowed不显示错误消息,python,flask,flask-wtforms,wtforms,Python,Flask,Flask Wtforms,Wtforms,我用的是WT表格。我正在对文件上传进行验证,并将其限制为jpg、png和pdf格式。但是,如果输入错误,则不会显示错误消息 我遵循了这个教程 photo=FileField('photo',验证器=[ FileRequired(), 允许文件(['png'、'pdf'、'jpg']、“格式错误!”) ]) 默认情况下,如果验证失败,flask wtf不会显示任何错误消息 可以捕获并显示每个字段或所有字段的错误消息 下面是一个在flask wtf中进行验证的文件上载示例 文件夹结构: . ├──
photo=FileField('photo',验证器=[
FileRequired(),
允许文件(['png'、'pdf'、'jpg']、“格式错误!”)
])
默认情况下,如果验证失败,flask wtf
不会显示任何错误消息
可以捕获并显示每个字段或所有字段的错误消息
下面是一个在flask wtf
中进行验证的文件上载示例
文件夹结构:
.
├── app.py
├── forms.py
├── requirements.txt
└── templates
└── upload.html
app.py
:
from flask import Flask, render_template
from forms import FileUploadForm
app = Flask(__name__)
app.secret_key = 'learnflask'
@app.route('/upload', methods=['GET', 'POST'])
def upload():
form = FileUploadForm()
if form.validate_on_submit():
f = form.photo_or_pdf_file.data
return f.filename
return render_template('upload.html', form=form)
from flask_wtf import FlaskForm
from wtforms import SubmitField
from flask_wtf.file import FileField, FileAllowed, FileRequired
class FileUploadForm(FlaskForm):
photo_or_pdf_file = FileField('photo', validators=[
FileRequired(),
FileAllowed(['png', 'pdf', 'jpg'], "wrong format!")
])
submit = SubmitField('Upload')
forms.py
:
from flask import Flask, render_template
from forms import FileUploadForm
app = Flask(__name__)
app.secret_key = 'learnflask'
@app.route('/upload', methods=['GET', 'POST'])
def upload():
form = FileUploadForm()
if form.validate_on_submit():
f = form.photo_or_pdf_file.data
return f.filename
return render_template('upload.html', form=form)
from flask_wtf import FlaskForm
from wtforms import SubmitField
from flask_wtf.file import FileField, FileAllowed, FileRequired
class FileUploadForm(FlaskForm):
photo_or_pdf_file = FileField('photo', validators=[
FileRequired(),
FileAllowed(['png', 'pdf', 'jpg'], "wrong format!")
])
submit = SubmitField('Upload')
模板/upload.html
:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>login</title>
<style>
.validation_error{
color: red;
}
</style>
</head>
<body>
<form method="POST" enctype="multipart/form-data">
{{ form.csrf_token }}
{{ form.photo_or_pdf_file.label }}<br>{{ form.photo_or_pdf_file }}
<span class="validation_error">{{ ', '.join(form.photo_or_pdf_file.errors) }}</span><br>
{{ form.submit }}<br>
</form>
</body>
</html>
运行应用程序:
export FLASK_APP=app.py
export FLASK_ENV=development
flask run
参考资料:
表单。提交时验证()
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