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POHow to get red borders when a field is invalid using WTForms with GAE and Jinja2?
 

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  1. POHow to get red borders when a field is invalid using WTForms with GAE and Jinja2?
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    <p>I've got validation practically working and part of my requirement is that when a field is not valid there should be a red border around the field that is not valid:</p> <p><img src="https://i.stack.imgur.com/1i7v6.png" alt="enter image description here"></p> <pre><code>&lt;tr&gt;&lt;td valign="top"&gt; &lt;div class="labelform" id="lname"&gt; {% filter capitalize %}{% trans %}name{% endtrans %}{% endfilter %}: &lt;/div&gt;&lt;/td&gt;&lt;td&gt; &lt;div class="adinput"&gt; {% if user or current_user %} &lt;input type="text" id="name" name="name" value="{{ current_user.name }}{% if not current_user %}{{ user.nickname() }}{% endif %}" size="35" maxlength="50" readonly/&gt; {% else %} {{ form.name|safe }} {% endif %} {% if form.name.errors %} &lt;ul class="errors"&gt;{% for error in form.name.errors %}&lt;li&gt;{{ error }}&lt;/li&gt;{% endfor %}&lt;/ul&gt; {% endif %} &lt;/div&gt; &lt;/td&gt;&lt;/tr&gt; </code></pre> <p>Can you tell me how I should achieve the red border around the form field conditioned on that the name field is not valid? Here's my python code for my form class:</p> <pre><code>class AdForm(Form): name = TextField(_('Name'), [validators.Length(min=4, max=50, message=_('Name is required'))]) title = TextField(_('title')) text = TextAreaField(_('Text'), widget=TextArea()) phonenumber = TextField(_('Phone number')) phoneview = BooleanField(_('Display phone number on site')) price = TextField(_('Price')) password = PasswordField(_('Password')) email = TextField(_('Email')) </code></pre> <p>The code that handles the HTTP POST of the form is:</p> <pre><code>... form = AdForm(self.request.params) if form.validate(): ad.title = form.title.data ad.name = form.name.data ad.email = form.email.data ad.text = form.text.data ad.set_password(form.password.data) ad.price = form.price.data try: form.price.data=form.price.data.replace(',','.').replace(' ', '') ad.decimal_price = form.price.data except: pass ad.phoneview = form.phoneview.data ad.url = os.environ.get('HTTP_HOST', os.environ['SERVER_NAME']) ad.place = self.request.get('place') ad.postaladress = self.request.get('place') ad.put() else: logging.info('form did not validate') self.render_jinja( 'insert_jinja', facebook_app_id=facebookconf.FACEBOOK_APP_ID, form=form, form_url=blobstore.create_upload_url('/upload_form'), user=(users.get_current_user() if users.get_current_user() else None), user_url=(users.create_logout_url(self.request.uri) if users.get_current_user() else None), current_user=self.current_user, ) return ... </code></pre> <p>Can you tell me how I should get the red border when a field is invalid? </p> <p>Thank you</p>
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