使用块将Smarty 3转换为Twig 2

问题描述：

hopefully this will be my last point of confusion.

In my Smarty templates I have what equates to the twig code below which sets the 'heading' block conditionally depending on what 'show' is set to. The template code I have inserted below doesn't work, it gives an error saying that the heading block is already defined. I did some research and I figured out that this doesn't work with Twig, I guess because it is compiling it before it is checking the if statement which to me is totally counter intuitive but I didn't create Twig. =)

{% if show is defined %}
        {% if show == 'add_form' %}
            {% block heading %}Add{% endblock %}
        {% elseif show == 'main' %}
            {% block heading %}Main{% endblock %}
 {% endif %}

I only use this style in templates where there are a bunch of very tiny views (literally 2-3 lines of HTML) so I suppose that I could just make separate template files for each of them but that just seems like a ton of extra files. What is the "right" way to do this in Twig?

Thanks again

希望这将是我最后的困惑点。 p>

在我的Smarty模板中，我有什么等同于下面的树枝代码，它根据设置的'show'有条件地设置'heading'块。我在下面插入的模板代码不起作用，它给出了一个错误，说明已经定义了标题块。我做了一些研究，我发现这不适用于Twig，我想是因为它在检查if语句之前编译它对我来说完全反直觉但我没有创建Twig。 =） p>

  {％if show is defined％} 
 {％if if show =='add_form'％} 
 {％block heading％}添加{％endblock％  } 
 {％elseif show =='main'％} 
 {％block heading％} Main {％endblock％} 
 {％endif％} 
  code>  pre> 
 
  
 
 再次感谢 p> 
  div>

答

Right, you can't define the same block multiple times, even if they are in separate logical branches.

These both work:

{% if show is defined %}
    {% block heading %}
        {% if show == 'add_form' %}
            Add
        {% elseif show == 'main' %}
            Main
        {% endif %}
    {% endblock %}
{% endif %}

{% block heading %}
    {% if show is defined %}
        {% if show == 'add_form' %}
            Add
        {% elseif show == 'main' %}
            Main
        {% endif %}
    {% endif %}
{% endblock %}

See TwigFiddle

I think the second one is clearer (at least in this case), because a template that extends another one cannot include contents outside Twig blocks. What this means is that if you try to do something like this:

{% extends 'layout.twig' %}

{% block heading %}
    Some content
{% endblock %}

Hello world!

You'll get a Twig_Error_Syntax exception with this message:

A template that extends another one cannot include contents outside Twig blocks. Did you forget to put the contents inside a {% block %} tag?

So, the template stays clear if you put all code inside blocks.

使用块将Smarty 3转换为Twig 2

相关推荐