我是网络开发新手,我正在使用Flask创建一个房地产价格预测网站
我有一个函数validate_on_submit不起作用。它没有显示任何错误,表单已提交,只是没有验证。单击提交表单时,它需要转到下一页。代码如下:
@app.route('/route1', methods=['POST', 'GET'])
def predict():
form = Form_1()
# These errors, submitted and validated just for some context, not in the actual code
print(form.errors) # Returns {}
if form.submit():
print("submitted") # Returns "submitted"
if form.validate():
print("validated") # Page shows error 'NoneType' object is not iterable
# more code
if form.validate_on_submit():
print("validated on submit") # This is not working
# more code
return redirect(url_for('page_x'))
return render_template('page_x.html', title='Page X', form=form)
以下是HTML:
<div class="content" align="center">
<div class="content-section">
<form method = "POST" action="">
{{ form.hidden_tag() }}
<table style="width:15%">
<tr>
<td>{{ form.select_field.label() }}</td>
<td>:</td>
<td>{{ form.select_field() }}</td>
</tr>
<tr>
<td></td>
<td></td>
<td>{{ form.submit() }}</td>
</tr>
</table>
</form>
</div>
</div>
这很奇怪,因为我有另一个类似的代码:
@app.route('/route2', methods=['POST', 'GET'])
def add_data():
form = Form_2()
if form.validate_on_submit():
# more code
return redirect(url_for('page_y')
return render_template('page_y.html', title='Page Y', form=form)
HTML:
<div class="content" align="center">
<h1>Help Us Improve by Uploading a New Dataset</h1>
<div class="content-section">
<form method="POST" action="" enctype="multipart/form-data">
{{ form.hidden_tag() }}
{{ form.add_file() }} {{ form.submit() }}
</form>
</div>
</div>
我不确定出了什么问题。任何帮助都将不胜感激。多谢各位
我发现了问题。我使用的是SelectField表单。我放置了一个
coerce
参数,它就工作了帮助我的文章:Not a Valid Choice for Dynamic Select Field WTFORMS
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