Jinja2 Template - for loop

Question

didn't find another post which has the similar problem, I'm trying to generate some checkboxes with flask and wtforms, at the moment I've got this piece of code:

<div class="control-group">
    <p><strong>Check the enabled BRI Ports</strong></p>
    <label class="checkbox inline">
        {{ form.bri1(value=1) }} {{ form.bri1.label }}
    </label>
    <label class="checkbox inline">
        {{ form.bri2(value=1) }} {{ form.bri2.label }}
    </label>
    <label class="checkbox inline">
        {{ form.bri3(value=1) }} {{ form.bri3.label }}
    </label>
    <label class="checkbox inline">
        {{ form.bri4(value=1) }} {{ form.bri4.label }}
    </label>
</div>

This works so far, but now I try to do this with a simple for-loop like:

<div class="control-group">
    <p><strong>Check the enabled BRI Ports</strong></p>
    {% for n in range(1,6) %}
    <label class="checkbox inline">
        {{ form.brin.label }}
    {% endfor %}
</div>

I tried with (), {} and {{}} ... is this even possible?

Solution

Try:

<div class="control-group">
    <p><strong>Check the enabled BRI Ports</strong></p>
    {% for name, field in form._fields.items() %}
        {% if name != 'csrf_token' %}
            <label class="checkbox inline">
                {{ field(value=1) }} {{ field.label }}
            </label>
        {% endif %}
    {% endfor %}
</div>

There you can set sorting instead form._fields.items() or condition instead {% if name != 'csrf_token' %}. Or:

<div class="control-group">
    <p><strong>Check the enabled BRI Ports</strong></p>
    {% for n in range(1,6) %}
        {% if form['bri' + n|string] %}
            <label class="checkbox inline">
                {{ form['bri' + n|string](value=1) }} {{ form['bri' + n|string].label }}
            </label>
        {% endif %}
    {% endfor %}
</div>

There you can also use n.__str__() instead filter n|string.

Comments

[Kilrathy]

I tried both, the second one gives me the error "TypeError: cannot concatenate 'str' and 'int' objects". The fist one partially works, but it gives me all field out, I only want the BooleanField bri1-4... any idea?

[tbicr]

Sorry, I updated second example. For first you can add own condition: {% if name.startswith('bri') %}.