如何忽略flask-wtf中的字段验证? [英] How can I ignore a field validation in flask-wtf?

问题描述

我有一个将项目添加到数据库的表单，该表单包含两个按钮: Cancel 和 Submit .我遇到的问题是，当我用空白表格按下 Cancel 按钮时，我得到一个请填写此字段.错误，而不是返回我的主页(请参阅 views.py 了解逻辑).那么，当我按下 Cancel 按钮时，如何让我的应用程序忽略 DataRequired 验证器?

I have a form to add an item to my database, which includes two buttons: Cancel and Submit. The problem I have is that when I press the Cancel button with an empty form, I get a Please fill out this field. error instead of returning to my home page (see views.py for logic). So how can I get my app to ignore the DataRequired validators when I press the Cancel button?

forms.py :

class ItemForm(FlaskForm):
  id = StringField('id', validators=[DataRequired()]
  name = StringField('Name', validators=[DataRequired()]
  cancel = SubmitField('Cancel')
  submit = SubmitField('Submit')

views.py :

def add_item()
  form = ItemForm()
  if form.validate_on_submit():
    if form.submit.data:
      # Code to add item to db, removed for brevity.
    elif form.cancel.data:
      flash('Add operation cancelled')
      return redirect(url_for('home.homepage'))

推荐答案

您的取消"按钮实际上不一定是提交"按钮.您可以简单地使用一个普通按钮将用户带回到首页(使用 href 或捕获 onclick 事件).

Your cancel button doesn't really need to be a submit button. You can simply have a normal button which takes the user back to the home page (using a href or capturing the onclick event).

如果您仍然希望 cancel 按钮成为WTForms字段，则一个选项是覆盖表单中的 validate 方法并删除 DataRequired 验证器上的 id 和 name .以下内容未经测试，但可能会为您提供一个起点.

If you still want the cancel button to be a WTForms field, one option would be to override the validate method in the form and remove the DataRequired validators on id and name. The below is untested but may give you a starting point to work from.

class ItemForm(FlaskForm):
  id = StringField('id')
  name = StringField('Name')
  cancel = SubmitField('Cancel')
  submit = SubmitField('Submit')

def validate(self):                                                         

    rv = Form.validate(self)                                                

    if not rv:                                                              
        return False                                                        

    if self.cancel.data
        return True

    if self.id.data is None or self.name.data is None:   
        return False                                                   

    return True  

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