list cycle in template

[Luca Bertolotti]

Hello in the view a hve a list

mylist = ['aa','bb']

n = range(len(mylist))

return render(....{'mylist':mylist,'n':n,.....})

in the template i do this:

<tr>{% for a in n %} <td>{{ mylist.a }}</td></tr>

it never show nothing, but if i do:

<tr>{% for a in n %} <td>{{ mylist.0 }}</td></tr>

it show 'aa'

Where is the mistake?

Thanks

[Cornelis Poppema]

{{ mylist.a }} means: get attribute "a" from object "mylist". For the template it doesn't matter if you have defind a variable "a", it will get the literal "a". Also see https://stackoverflow.com/questions/4651172/reference-list-item-by-index-withdoesin-django-template for others with the same problem and a solution. You can add a template filter which does support variables. Your template will then look like {{ mylist|index:a }}. Credits to Bakuutin and WeizhongTu for this specific example:

from django import template
register = template.Library()

@register.filter
def index(indexable, i):
    return indexable[i]

{% load index %}
{{ mylist|index:a }}

I believe you will need to do the same if you want to access any property from that item, ie. {{ mylist|index:a }}.property doesn't work, you would need to write a new filter to be able to do {{ mylist|index:a|attr:"property" }}

Besides all this, is there a reason you cannot simply use a for-loop to iterate over mylist ?

{% for item in mylist %}

    {{ item.property }}

{% endfor %}

[Luqman Shofuleji]

1) you forgot to include  {% endfor %} in you template

2) I believe in your view all you actually need is:

mylist = ['aa','bb'] 

return render(....{'mylist':mylist})  

Then in your template:

                      <tr>
                        {% for a in mylist %}
                          <td>{{ mylist }}</td>
                        {% endfor %}
                      </tr>

 

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[Luqman Shofuleji]

Sorry little mistake there:

Then in your template:

                      <tr>
                        {% for a in mylist %}

                          <td>{{ a }}</td>
                        {% endfor %}
                      </tr>

[Luca Bertolotti]

Hello I have solved using a tuple because i need to compare value:

{% for matric,lotto,rimanenza in lista_finale %} {% if matric == dati.partn %}<td>{{ lotto }} -- {{ rimanenza }}</td>{% endif %}{% endfor %}</tr>

Where lista finale is a list of tuple

Thanks to all

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