I am getting an array arr passed to my Django template. I want to access individual elements of the array in the array (e.g. arr[0], arr[1]) etc. instead of looping through the whole array.
Is there a way to do that in a Django template?
4 Answers
Remember that the dot notation in a Django template is used for four different notations in Python. In a template, foo.bar can mean any of:
foo[bar] # dictionary lookup
foo.bar # attribute lookup
foo.bar() # method call
foo[bar] # list-index lookup
It tries them in this order until it finds a match. So foo.3 will get you your list index because your object isn't a dict with 3 as a key, doesn't have an attribute named 3, and doesn't have a method named 3.
4 Comments
Bob Stein
Aren't the first and last more like
foo['bar']?
Vicky Chijwani
There seems to be no way to access a list item using a variable index :(
ehacinom
Agree with @VickyChijwani: the fourth option above is not valid. Django templates don't seem to do list-index lookups with variables
Csaba Toth
@hiyume How to overcome that?
arr.0
arr.1
etc.
3 Comments
Nandha Kumar
how to print dynamic like ex: arr.variablename
jhagege
Is there any way to do this without magic numbers? In other words to "name" the .0 .1 .2 etc...? Such as array["first name"], array["last name"] etc..
Ofri Raviv
@cyberjoac in that case use a dict. In the view: d = {'first_name':'foo', 'last_name': 'bar'}. In the template {{ d.first_name }} will work just fine.
You can access sequence elements with arr.0, arr.1 and so on. See The Django template system chapter of the django book for more information.
Comments
When you render a request to context some information, for example:
return render(request, 'path to template', {'username' :username, 'email' :email})
You can access to it on template, for variables
{% if username %}{{ username }}{% endif %}
for arrays
{% if username %}{{ username.1 }}{% endif %}
{% if username %}{{ username.2 }}{% endif %}
you can also name array objects in views.py and then use it as shown below:
{% if username %}{{ username.first }}{% endif %}
arr.0,arr.1, ... Another solution : write your own template tagarr|array_item: "0"or something like this.