Python:在表单中添加验证 [英] Python : add validation in form

问题描述

谁能告诉我如何在 textInput 上设置 required 验证
什么时候点击Ok按钮?
这时点击 Ok 按钮然后我检查每个 TextInput 像这样.
if self.name.text.strip() == "":
但是如果我的表单有超过 50 字段，那么代码会很长?有人可以告诉我另一种在 TextInputrequired 验证的简短方法>.

Can someone tell me that how to set required validation on textInput
when click on Ok button?
At this time click on Ok button then i check every TextInput like that.
if self.name.text.strip() == "":
But if my form have more than 50 feilds then it will be very lengthy code?Can someone tell me another short way to set required validation on TextInput.

from kivy.uix.screenmanager import Screen
from kivy.app import App
from kivy.lang import Builder
from kivy.core.window import Window
from kivy.properties import ObjectProperty
from kivy.uix.textinput import TextInput
Window.size = (500, 330)

class FloatInput(TextInput):

    def __init__(self, **kwargs):
        super(FloatInput, self).__init__(**kwargs)

    def on_text(self, instance, text):
        if text !="":
            print(text)

class TestScreen(Screen):
    name = ObjectProperty(None)
    clas = ObjectProperty(None)

    def check_validation(self):
        if self.name.text.strip() == "":
            print("Name is blank")
        elif self.clas.text.strip() == "":
            print("clas is blank")



class Test(App):
    def build(self):
        self.root = Builder.load_file('test.kv')
        return self.root


if __name__ == '__main__':
    Test().run()

test.kv

#:kivy 1.10.0
TestScreen:
    name:name
    clas:clas

    GridLayout:
        cols: 2
        padding : 30,30
        spacing: 10, 10
        row_default_height: '40dp'

        Label:
            text: 'Name'

        FloatInput:
            id: name

        Label:
            text: 'Class'

        FloatInput:
            id: clas


        Button:
            text: 'Ok'
            on_release: root.check_validation()

        Button:
            text: 'Cancel'

推荐答案

1. 创建一个GridLayout
的ScrollView
2. 使用循环创建由 Label 和 TextInput 小部件组成的表单的每一行
3. 使用循环访问 self.container.children 中的子小部件.

1. Create a ScrollView of GridLayout
2. Use a loop to create each line of the form consisting of a Label and TextInput widgets
3. Use a loop to access child widget in self.container.children.

详情请参考以下示例.

from kivy.app import App
from kivy.core.window import Window
from kivy.uix.screenmanager import Screen
from kivy.uix.label import Label
from kivy.uix.textinput import TextInput
from kivy.metrics import dp
from kivy.properties import ObjectProperty, DictProperty

Window.size = (500, 330)


class FloatInput(TextInput):

    def on_text(self, instance, text):
        if text != "":
            print("id={0}, text={1}".format(instance.id, text))


class TestScreen(Screen):
    container = ObjectProperty(None)

    def __init__(self, **kwargs):
        super(TestScreen, self).__init__(**kwargs)
        self.container.bind(minimum_height=self.container.setter('height'))
        self.create_form()

    def create_form(self):
        # create 50 labels and text inputs
        for i in range(50):
            label = Label(text="Label {}".format(i), size_hint_y=None, height=dp(40))
            text_input = FloatInput(id=str(i), hint_text="TextInput {}".format(i), size_hint_y=None, height=dp(40))
            self.container.add_widget(label)
            self.container.add_widget(text_input)

    def check_validation(self):
        for child in reversed(self.container.children):
            if isinstance(child, Label):
                label_text = child.text
            if isinstance(child, FloatInput):
                if child.text.strip() == "":
                    print("{0} - TextInput is blank, obj={1}".format(label_text, child))


class Test(App):
    def build(self):
        return TestScreen()


if __name__ == '__main__':
    Test().run()

test.kv

#:kivy 1.10.0

<TestScreen>:
    container: container

    BoxLayout:
        orientation: 'vertical'

        BoxLayout:
            orientation: 'vertical'

            ScrollView:

                GridLayout:
                    id: container
                    cols: 2
                    size_hint_y: None
                    padding : 30,30
                    spacing: 10, 10

        BoxLayout:
            size_hint_y: 0.2

            Button:
                text: 'Ok'
                on_release: root.check_validation()

            Button:
                text: 'Cancel'

输出

这篇关于Python:在表单中添加验证的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！