Question

在我的表单上，我有两个用于提交表单的按钮。一个按钮删除所选文件（在表格中显示，一个对象复选框），另一个按钮选择它们进行处理。

删除时选择文件时，不需要验证（除了检查至少选择了一个文件）。但是，为了处理，我需要确保只有一个特定扩展名的文件。 基本上，我需要根据用户点击的按钮进行不同的验证过程。

我怎样才能做到最好？我知道我可以在视图中执行验证，但我更倾向于在表单中验证它，因为它更清晰。

以下是相关表格：

class ButtonWidget(object):
    """A widget to conveniently display buttons.
    """
    def __call__(self, field, **kwargs):
        if field.name is not None:
            kwargs.setdefault('name', field.name)
        if field.value is not None:
            kwargs.setdefault('value', field.value)
        kwargs.setdefault('type', "submit")
        return HTMLString('<button %s>%s</button>' % (
            html_params(**kwargs),
            escape(field._value())
            ))

class ButtonField(Field):
    """A field to conveniently use buttons in flask forms.
    """
    widget = ButtonWidget()

    def __init__(self, text=None, name=None, value=None, **kwargs):
        super(ButtonField, self).__init__(**kwargs)
        self.text = text
        self.value = value
        if name is not None:
            self.name = name

    def _value(self):
        return str(self.text)

class MultiCheckboxField(SelectMultipleField):
    """
    A multiple-select, except displays a list of checkboxes.

    Iterating the field will produce subfields, allowing custom rendering of
    the enclosed checkbox fields.
    """
    widget = ListWidget(prefix_label=False)
    option_widget = CheckboxInput()

class ProcessForm(Form, HiddenSubmitted):
    """
    Allows the user to select which objects should be
    processed/deleted/whatever.
    """

    PROCESS = "0"
    DELETE = "-1"

    files = MultiCheckboxField("Select", coerce=int, validators=[
        Required()
        ]) # This is the list of the files available for selection
    process_button = ButtonField("Process", name="action", value=PROCESS)
    delete_button = ButtonField("Delete",  name="action", value=DELETE)

    def validate_files(form, field):
        # How do I check which button was clicked here?
        pass

Answer 1

关于HTML中按钮的关键要点是只有按下的按钮才会将其数据发送回服务器。因此，您只需检查按钮的data字段是否使用if form.process_button.data进行设置，一般情况下就会有效。

在您的特定情况下，由于您的两个按钮都从相同的基础参数名称（action）中提取数据，因此您需要检查其中一个按钮字段中的数据是否符合预期： / p>

def validate_files(form, field):
    # If the ButtonFields used different names then this would just be
    # if form.process_button.data:
    if form.process_button.data == ProcessForm.PROCESS:
        # Then the user clicked process_button
    else:
        # The user clicked delete_button

根据单击按钮验证WTForm表单

1 个答案: