次のようにフォーム エラーを処理するマクロを作成しました。
{% macro render_field_with_errors(field) %}
<p>
{{ field.label }} {{ field(**kwargs)|safe }}
{% if field.errors %}
<ul>
{% for error in field.errors %}
<li style="color: red;">{{ error }}</li>
{% endfor %}
</ul>
{% endif %}
</p>
{% endmacro %}
{% macro render_field(field) %}
<p>{{ field(**kwargs)|safe }}</p>
{% endmacro %}
私のforms.pyは次のとおりです:
from flask.ext.wtf import Form, TextField, BooleanField, PasswordField, RadioField, SelectMultipleField
from flask.ext.wtf import Required
class LoginForm(Form):
username = TextField('email', validators = [Required()])
password = PasswordField('password', validators=[Required()])
remember_me = BooleanField('remember_me', default = False)
私のログインフォームは次のとおりです。
<!-- Login form -->
{% from "includes/_formhelpers.html" import render_field_with_errors %}
<form method="POST" action="/login" focus="first">
<div class="span5">
{{ login_form.hidden_tag() }}
{{ render_field_with_errors(login_form.username(placeholder="Username / Email", class="span10")) }}
<br>
{{ render_field_with_errors(login_form.password(placeholder="Password", class="span10")) }}
<br>
<div class="qp-log">
{{ render_field_with_errors(login_form.remember_me(class="qp-login", value="remember_me")) }} Remember Me
<br>
<button type="submit" class="btn qp-btn" style="height:30px;width:56px;">Login</button>
<button type="Reset" class="btn">Clear</button>
</div>
<div class="qp-pass">
Forgot Password? <a href ="#">click here</a>
</div>
</div>
<div class="span2">
<br>
<br>
<br>
<img src="{{ url_for('static', filename='img/or_icon.gif') }}">
</div>
<div class="span5">
<center>
<br>
<button class="btn btn-facebook">
<small>Connect with</small>
<big> Facebook </big>
</button>
<h4> or </h4>
<button type="Submit" class="btn qp-btn">
<a href="signup.html" style="color:white;">Sign Up for Free</a>
</button>
</center>
</div>
</form>
<!-- Form End -->
次のエラーが表示されます:
Traceback (most recent call last):
File "/home/rahul/git/webapp/venv/lib/python2.7/site-packages/flask/app.py", line 1701, in __call__
return self.wsgi_app(environ, start_response)
File "/home/rahul/git/webapp/venv/lib/python2.7/site-packages/flask/app.py", line 1689, in wsgi_app
response = self.make_response(self.handle_exception(e))
File "/home/rahul/git/webapp/venv/lib/python2.7/site-packages/flask/app.py", line 1687, in wsgi_app
response = self.full_dispatch_request()
File "/home/rahul/git/webapp/venv/lib/python2.7/site-packages/flask/app.py", line 1360, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/home/rahul/git/webapp/venv/lib/python2.7/site-packages/flask/app.py", line 1358, in full_dispatch_request
rv = self.dispatch_request()
File "/home/rahul/git/webapp/venv/lib/python2.7/site-packages/flask/app.py", line 1344, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "/home/rahul/git/webapp/webapp/routes.py", line 14, in index
return render_template("public/index.html", login_form=login_form)#, registration_form=registration_form)
File "/home/rahul/git/webapp/venv/lib/python2.7/site-packages/flask/templating.py", line 125, in render_template
context, ctx.app)
File "/home/rahul/git/webapp/venv/lib/python2.7/site-packages/flask/templating.py", line 107, in _render
rv = template.render(context)
File "/home/rahul/git/webapp/venv/lib/python2.7/site-packages/jinja2/environment.py", line 969, in render
return self.environment.handle_exception(exc_info, True)
File "/home/rahul/git/webapp/venv/lib/python2.7/site-packages/jinja2/environment.py", line 742, in handle_exception
reraise(exc_type, exc_value, tb)
File "/home/rahul/git/webapp/webapp/templates/public/index.html", line 1, in top-level template code
{% extends "public/base.html" %}
File "/home/rahul/git/webapp/webapp/templates/public/base.html", line 1, in top-level template code
{% extends 'layout.html' %}
File "/home/rahul/git/webapp/webapp/templates/layout.html", line 35, in top-level template code
{% block content %}{% endblock %}
File "/home/rahul/git/webapp/webapp/templates/public/index.html", line 4, in block "content"
{% include 'public/login.html' %}
File "/home/rahul/git/webapp/webapp/templates/public/login.html", line 6, in top-level template code
{{ render_field_with_errors(login_form.username(placeholder="Username / Email", class="span10")) }}
File "/home/rahul/git/webapp/webapp/templates/includes/_formhelpers.html", line 3, in template
{{ field.label }} {{ field(**kwargs)|safe }}
AttributeError: 'HTMLString' object has no attribute '__call__'
コードで何が間違っているのですか?HTML ファイルからマクロを削除し、代わりにエラー処理用の for ループを HTML 形式で含めると、完全に機能します。私が思うに、エラーの原因となる要素に含まれるプレースホルダーとクラスですが、その理由はわかりませんか?