提交失败后，Flask-WTF Filefield值将消失 [英] Flask-WTF Filefield value disappear after unsuccessful submit

问题描述

  class DogForm（Form）：
 birthdate = DateField（u'Birthdate '，validators = [DataRequired（message = uUser correct form DMY）]，format ='％d。％m。％Y'）
 image = FileField（u'Image of a dog'，validators = [可选（）]）
 submit = SubmitField（u'Save'）
  

这个

  {{wtf.form_field（dogForm.birthdate）}} 
 {{wtf.form_field（dogForm.image ）}} 
 {{wtf.form_field（form.submit）}} 
  

，如果出生日期是错误的形式，

  form.validate_on_submit（）
  

停止验证过程并返回生日错误

查看

  form = dogForm（）
 if form.validate_on_submit（）：
 add_dog（form）
 
 return render_template dog.html，form = form）
  

我的问题是FileField的文件路径消失在重新加载的形式，我不能事件设置它像其他值

  form.image.data = somepath ..
  

解决方案

请记住设置您的enctype HTML form到multipart / form-data

 < form method =POSTenctype =multipart / form-data> ; 
 .... 
< / form> 
  

了解更多详情，请查看以下链接：

http://pythonhosted.org/Flask-WTF/form.html

I have form defined like this

class DogForm(Form):
    birthdate = DateField(u'Birthdate', validators=[DataRequired(message=u"User correct form D.M.Y")], format='%d.%m.%Y')
    image = FileField(u'Image of a dog', validators=[Optional()])
    submit = SubmitField(u'Save')

template like this

{{ wtf.form_field(dogForm.birthdate) }}
{{ wtf.form_field(dogForm.image) }}
{{ wtf.form_field(form.submit) }}

Upon subbmitting, if birthdate is given in wrong form,

form.validate_on_submit()

stops validating procces and gives back birthday error

view

form = dogForm()
if form.validate_on_submit():
    add_dog(form)

return render_template("dog.html", form=form)

My problem is that file path from the FileField disappears in reloaded form and i can not event set it like other values

form.image.data = "somepath.."

解决方案

Remember to set the enctype of your HTML form to multipart/form-data

<form  method="POST" enctype="multipart/form-data">
    ....
</form>

for more detail, check the following link:

http://pythonhosted.org/Flask-WTF/form.html

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