I need to check if the variable texts
is defined or not in index.html
.
If the variable is defined and not empty then I should render the loop. Otherwise, I want to show the error message {{error}}
.
Basically this in PHP
if (isset($texts) && !empty($texts)) {
for () { ... }
}
else {
print $error;
}
index.html
{% for text in texts %}
<div>{{error}}</div>
<div class="post">
<div class="post-title">{{text.subject}}</div>
<pre class="post-content">{{text.content}}</pre>
</div>
{% endfor %}
How do I say this in jinja2?
Take a look at the documentation of Jinja2 defined()
: http://jinja.pocoo.org/docs/templates/#defined
{% if variable is defined %}
value of variable: {{ variable }}
{% else %}
variable is not defined
{% endif %}
Is it clear enough? In your case it could look like this:
{% if texts is defined %}
{% for text in texts %}
<div>{{ error }}</div>
<div class="post">
<div class="post-title">{{ text.subject }}</div>
<pre class="post-content">{{ text.content }}</pre>
</div>
{% endfor %}
{% else %}
Error!
{% endif %}