Passing variable data between blocks in twig

Question

Twig:

{% set var = 'apple' %}

{% block A %}
    {{ var }} {# This prints apple #}
{% endblock %}

{% block B %}
    {% set var = 'banana' %}
    {{ var }} {# This prints banana #}
{% endblock %}

{% block C %}
    {{ var }} {# This prints apple, but I want it to print banana #}
{% endblock %}

Is there any way to get the changed value from block B in block C?

e.g. In PHP i can do: $var= 0;if(true){$var =2;}echo $var; # value == 2 not 0 — Zuhayer Tahir
– Zuhayer Tahir, Commented Mar 17, 2017 at 10:29
Twig blocks have their own scope. So if you want block C to print banana, you have to override var outside block B. — mickdev
– mickdev, Commented Mar 17, 2017 at 11:15
Also, have a look at the with keyword in twig: twig.sensiolabs.org/doc/2.x/tags/with.html — Jan
– Jan, Commented Mar 17, 2017 at 11:24
@mickdev I want the changed value from Block B in Block C i.e. banana. The actual issue I have is I have a {body block} in which I set the value and I want access to that new value in my {javascript block}. — Zuhayer Tahir
– Zuhayer Tahir, Commented Mar 18, 2017 at 10:58
@Jan I tried it earlier, But I suspect I might have missed something. Let me check and get back to you. — Zuhayer Tahir
– Zuhayer Tahir, Commented Mar 18, 2017 at 10:59

Zuhayer · Accepted Answer · 2017-03-18 13:54:04Z

4

You can hack it and set the value in your $_SESSION variable and access it in the required block:

{% set var = 'apple' %}

{% block A %}
    {{ var }} {# This prints apple #}
{% endblock %}

{% block B %}
    {% set var = 'banana' %}
    {{ var }} {# This prints banana #}
    {{ app.session.set('var', var) }}
{% endblock %}

{% block C  %}
    {{ var }} {# This prints apple #}
    {% set var = app.session.get('var') %}
    {{ var }} {# This prints banana #}
{% endblock %}

Here is the twigfiddle to show you.

Or In the comment section you mentioned that you want to access a variable in {% block javascripts %} which has been set in {% block body %}. You can hack it and move your js code in your body block. But I prefer to keep my js code in one place.

{% set var = 'apple' %}

{% block A %}
    {{ var }} {# This prints apple #}
{% endblock %}

{% set var = 'banana' %}
{% block B %}
    {{ var }} {# This prints banana #}
`<script>{{ var }}</script>` {# Bring your js code in the required block#}
{% endblock %}

edited Mar 18, 2017 at 13:54

answered Mar 18, 2017 at 12:43

Zuhayer

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2 Comments

lcjury Over a year ago

This could solve the problem, but, please! stop putting everything into sessions and treating them as if the session were a global var. I consider this a bad practice and should be avoided.

Xavi Montero Over a year ago

A bit hacky and dirty. But for self-tools not intended to be published, it may do the trick. In my case I had a loop and at the end of the loop a footnote that only was displayed if within the loop I found X condition. As the loop grew, I moved the content of the loop out in a block. No longer I could update the variable where to track if it was found. Thanks for the trick.

Alvin Bunk · Accepted Answer · 2017-03-17 15:42:42Z

1

You have to do the set outside of the block like so:

{% set var = 'apple' %}

{% block A %}
    {{ var }} {# This prints apple #}
{% endblock %}

{% set var = 'banana' %}
{% block B %}
    {{ var }} {# This prints banana #}
{% endblock %}

{% block C %}
    {{ var }}
{% endblock %}

Here is the twigfiddle to show you.

answered Mar 17, 2017 at 15:42

Alvin Bunk

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1 Comment

Zuhayer Tahir Over a year ago

I want the changed value from Block B in Block C i.e. banana. The actual issue I have is I have a {body block} in which I set the value and I want access to that new value in my {javascript block}.

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