CODEWITHSUNDEEP
djangodjango-templates
user479808
user479808

Reputation: 663

Need to convert a string to int in a django template


I am trying to pass in url parameters to a django template like this...

response = render_to_string('persistConTemplate.html', request.GET)

This the calling line from my views.py file. persistConTemplate.html is the name of my template and request.GET is the dictionary that contains the url parameters.

In the template I try to use one of the parameters like this...

{% for item in (numItems) %}

  item {{item}}

{% endfor %}

numItems is one of the url parameters that I am sending in my request like this...

http:/someDomain/persistentConTest.html/?numItems=12

When I try the for loop above, I get an output like this....

image 1 image 2

I am expecting and would like to see the word image printed 12 times...

image 1 image 2 image 3 image 4 image 5 image 6 image 7 image 8 image 9 image 10 image 11 image 12

Can anyone please tell me what I am going wrong?

Upvotes: 65

Views: 113334

Answers (8)

Shaiful Islam
Shaiful Islam

Reputation: 442

You can do like that: if "select" tag used.

{% if i.0|stringformat:'s' == request.GET.status %} selected {% endif %}

Upvotes: 1

cirsam
cirsam

Reputation: 9

In my case one of the items was a string and you can not compare a string to an integer so I had to coerce the string into an integer see below

{% if questions.correct_answer|add:"0" == answers.id %}
    <span>Correct</span>
{% endif %}

Upvotes: 1

Akash
Akash

Reputation: 599

The easiest way to do this is using inbuilt floatformat filter.

For Integer

{{ value|floatformat:"0" }}

For float value with 2 precision 

{{ value|floatformat:"2" }}

It will also round to nearest value. for more details, you can check https://docs.djangoproject.com/en/1.10/ref/templates/builtins/#floatformat.

Upvotes: 12

WesternGun
WesternGun

Reputation: 12817

My solution is kind of a hack and very specific..

In the template I want to compare a percentage with 0.9, and it never reaches 1, but all the values are considered string in the template, and no way to convert string to float.

So I did this:

{% if "0.9" in value %}
...
{% else %}
...
{% endif %}

If I want to detect some value is beyond 0.8, I must do:

{% if ("0.9" in value) or ("0.8" in value) %}
...
{% else %}
...
{% endif %}

This is a hack, but suffice in my case. I hope it could help others.

Upvotes: -1

scytale
scytale

Reputation: 12641

you can coerce a str to an int using the add filter 

{% for item in numItems|add:"0" %}

https://docs.djangoproject.com/en/dev/ref/templates/builtins/#add

to coerce int to str just use slugify

{{ some_int|slugify }}

EDIT: that said, I agree with the others that normally you should do this in the view - use these tricks only when the alternatives are much worse.

Upvotes: 148

clime
clime

Reputation: 8885

I like making a custom filter:

# templatetags/tag_library.py

from django import template

register = template.Library()

@register.filter()
def to_int(value):
    return int(value)

Usage:

{% load tag_library %}
{{ value|to_int }}

It is for cases where this cannot be easily done in view.

Upvotes: 39

Yuji &#39;Tomita&#39; Tomita
Yuji &#39;Tomita&#39; Tomita

Reputation: 118538

Yes, the place for this is in the view.

I feel like the above example won't work -- you can't iterate over an integer.

numItems = request.GET.get('numItems')

if numItems:
   numItems = range(1, int(numItems)+1)

return direct_to_template(request, "mytemplate.html", {'numItems': numItems})


{% for item in numItems %}
 {{ item }}
{% endfor %}

Upvotes: 10

Ned Batchelder
Ned Batchelder

Reputation: 376052

You should add some code to your view to unpack the GET params and convert them to the values you want. Even if numItems were an integer, the syntax you're showing wouldn't give you the output you want.

Try this:

ctx = dict(request.GET)
ctx['numItems'] = int(ctx['numItems'])
response = render_to_string('persistConTemplate.html', ctx)

Upvotes: 2

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