Jinja check every loop index value

Question

how can i do this in jinja condition

My goal is to check the value of value_index every index of the loop if the next index value is same then it will not print . until the next value is not equal to value_index it will print it.

sample data:

users = [ ('username1','password1'),('username2','password1') ]
contacts  = [('0909','0909','0011','0011','0011','0908')]

so far i have this code but its not working as i expected

{% for items in users %}
  {% set i = loop %}
  {% set value_index = '' %}
  {% print(items[0]) %}

  {% for item in contacts %} 
     {% if value_index  != item  %}
        {% print(item) %}  
    {% endif %} 
    {% set value_index = item %}

  {% endfor %} 
{% endfor %}

My expected output is

username1
0909
0011
0908
username2
0909
0011
0908

Sergei Sadovnikov · Accepted Answer · 2019-09-17 08:55:26Z

1

I suppose you're looking for loop.changed(*val) method: https://jinja.palletsprojects.com/en/2.10.x/templates/#for (see table). So, you just need to call the method in your if tag like this:

{% for items in users %}
  {% print(items[0]) %}

  {% for item in contacts %}
     {% if loop.changed(item)  %}
        {{ item }}
     {% endif %} 
  {% endfor %} 
{% endfor %}

If the value of item actually changed from the previous call of loop.changed the result of the call is true. false otherwise.

edited Sep 17, 2019 at 8:55

answered Sep 17, 2019 at 8:48

Sergei Sadovnikov

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1 Comment

Jakegarbo Over a year ago

Works like a charm! @sergei sadovnikov THANK YOU! :) :D

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