Question

如何在提交后从WTForms表单中获取数据？我想在表单中输入电子邮件。

class ApplicationForm(Form):
    email = StringField()

@app.route('/', methods=['GET', 'POST'])
def index():
    form = ApplicationForm()

    if form.validate_on_submit():
        return redirect('index')

    return render_template('index.html', form=form)

<form enctype="multipart/form-data" method="post">
    {{ form.csrf_token }}
    {{ form.email }}
    <input type=submit>
</form>

Answer 1

使用Form.attrs进行操作的最可能的地方是index函数。我在方法参数上添加了一些条件保护。如果他们使用GET或POST，您也希望执行不同的操作。还有其他方法可以做到这一切，但我不想立刻改变太多。但是你应该这样清楚地思考它。如果我没有表单数据，因为我刚刚提出了初始请求，那么我将使用GET。在模板中呈现表单后，我将发送POST（您可以在模板顶部看到）。所以我需要先处理这两个案件。

然后，一旦表单被渲染并返回，我将有数据或没有数据。因此，处理数据将在控制器的POST分支中发生。

@app.route('/index', methods=['GET', 'POST'])
def index():
    errors = '' 

    form = ApplicationForm(request.form)
    if request.method == 'POST':
        if form.is_submitted():
            print "Form successfully submitted"
        if form.validate_on_submit():
            flash('Success!')
            # Here I can assume that I have data and do things with it.
            # I can access each of the form elements as a data attribute on the
            # Form object.
            flash(form.name.data, form.email.data)
            # I could also pass them onto a new route in a call.
            # You probably don't want to redirect to `index` here but to a 
            # new view and display the results of the form filling.
            # If you want to save state, say in a DB, you would probably
            # do that here before moving onto a new view.
            return redirect('index')
        else:  # You only want to print the errors since fail on validate
            print(form.errors)  
            return render_template('index.html',
                                   title='Application Form',
                                   form=form)
    elif request.method == 'GET':
        return render_template('index.html', 
                               title='Application Form',
                                   form=form)

为了提供帮助，我在一些工作代码中添加了一个简单的示例。根据您的代码和我的演练，您应该能够遵循它。

def create_brochure():
    form = CreateBrochureForm()
    if request.method == 'POST':
        if not form.validate():
            flash('There was a problem with your submission. Check the error message below.')
            return render_template('create-brochure.html', form=form)
        else:
            flash('Succesfully created new brochure: {0}'.format(form.name.data))
            new_brochure = Brochure(form.name.data,
                                    form.sales_tax.data,
                                    True,
                                    datetime.datetime.now(),
                                    datetime.datetime.now())
            db.session.add(new_brochure)
            db.session.commit()
            return redirect('brochures')
    elif request.method == 'GET':
        return render_template('create-brochure.html', form=form)

Answer 2

每个字段都有data属性，其中包含已处理的数据。

the_email = form.email.data

getting started doc。

中介绍了使用表单数据

从WTForms表单获取数据

2 个答案: