RadioField永远不会正确验证

问题描述

我是不熟悉烧瓶的人，尝试建立一个简单的人口统计调查.验证 StringField (例如国籍)可以正常工作时， RadioField 遇到了麻烦.如果我没有为 RadioField 提供任何输入，则不会出现错误消息.我认为问题出在我的jinja2模板中，但我找不到我做错的事情.

I'm new to flask and try to build a simple demographics survey. While validating a StringField (e.g. Nationality) works fine, I have trouble with the RadioField. No error messages occur if I don't provide any input for the RadioField. I think the problem lies in my jinja2 template but I'm not able to find what I'm doing wrong.

有什么建议吗?

从main.py中提取:

extract from main.py:

class DemographicsForm(FlaskForm):
Gender = RadioField(
                    'Gender',
                    choices=[('M', 'Male'), ('F', 'Female'), ('O', 'Other')],
                    validators=[InputRequired()]
                    )


@app.route("/demographics", methods=['GET', 'POST'])
def demographics():
    form = DemographicsForm()
    return render_template('demographics.html', title='Demographic Information', form=form)

从demographics.html中提取:

extract from demographics.html:

<div class="form-group">
    {{ form.Gender.label(class='radio') }}

    {% if form.Gender.errors %}
       {{ form.Gender(class='radio is-invalid') }}
        <div class="invalid-feedback">
            {% for error in form.Gender.errors %}
                <span>{{ error }}</span>
            {% endfor %}
        </div>
    {% else %}
        {{ form.Gender(class='radio') }}
    {% endif %}
</div>

推荐答案

实际上，问题出在您的Jinja代码中.您实施错误处理的方式非常令人困惑.它应该像这样简单:

Actually the problem comes from your Jinja code. The way you implemented error handling is pretty confusing. It should be as simple as this one:

<div class="form-group">
    {{ form.Gender.label(class='radio') }}
    {{ form.Gender(class='radio') }}
    {% for error in form.Gender.errors %}
        <span style="color: red;">[{{ error }}]</span>
    {% endfor %}
</div>

因此，当您在未选择单选按钮的情况下发送表单时，错误消息将出现在页面上(在上面的代码中将显示为红色)和控制台中.

Thus, when you send the form without having selected a radio button, an error message will appear on your page (in the code above it will appear in red) and in your console.

此处有更多详细信息

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