在wtForms中创建自定义字段

Question

在我的表单中,我试图创建一个带有选择的自定义数组字段.

自定义表单字段:

class CustomField(Field):
    widget = TextInput()
    def _value(self):
        if self.data:
            return u', '.join(self.data)
        else:
            return u''

    def process_formdata(self, valuelist):
        if valuelist:
            self.data = [x.strip() for x in valuelist[0].split(',')]
        else:
            self.data = []

实际表单调用自定义表单字段

class PostForm(Form):

    status = CustomField()

每当我发布的数据PostForm,它调用自定义字段,但在任何不通过valuelist到process_formatdata.自定义字段始终返回空列表.
我在这里遗漏了什么.

Answer 1

你的代码对我有用,这是一个有效的例子 -

example.py

from flask import Flask, render_template
from flask.ext.wtf import Form, SubmitField, Field, TextInput

app = Flask(__name__)
app.config['SECRET_KEY'] = 'Shh!'


class CustomField(Field):
    widget = TextInput()

    def _value(self):
        if self.data:
            return u', '.join(self.data)
        else:
            return u''

    def process_formdata(self, valuelist):
        if valuelist:
            self.data = [x.strip() for x in valuelist[0].split(',')]
        else:
            self.data = []


class ExampleForm(Form):
    status = CustomField()
    submit = SubmitField('POST')


@app.route('/', methods=['post', 'get'])
def hello_world():
    form = ExampleForm()
    if form.validate_on_submit():
        for entry in form.status.data:
            print '{}'.format(entry)
    return render_template('test.html', form=form)


if __name__ == '__main__':
    app.run(debug=True)

模板/ test.html中

<form action="." method="post">
    {{ form.hidden_tag() }}
    {{ form.status }}
    {{ form.submit }}
</form>