如何获得for循环中的第二个元素 [英] How to get the second element in a for loop

问题描述

我在Twig中有一个for循环。我试图访问for循环中的不同元素，所以我可以在我的网站上的不同地方使用它们。

让我们有一个名为'图像'的模板。在这个模板中，我有一个for循环，如下所示：

  {％图像中的图像％} 
< div> ; 
< img src ={{image | url_image}}width =100height =100/> 
< / div> 
 {％endfor％} 
  

在另一个模板中，图像模板。所以我得到的是：

$ p $ {％include'images.html'％}


现在我所面临的问题是我只想要images.html模板中for循环的第二个元素。你是怎么做到的？

所以我想要这样的东西：

 < DIV> 
 {％include'images.html'with {'second element'} only％} 
< / div> 
  

有人知道最好的方法是什么或者你是如何做的？你可以看到我是Twig的新手）

解决方案

你几乎已经找到了你的答案！ b
$ b

使用作为条件语法：

  {％key，图片中的图片if key == elementNumber％} 
< ; DIV> 
< img src ={{image | url_image}}width =100height =100/> 
< / div> 
 {％endfor％} 
  

然后用你需要的参数值记住 key 从0开始，所以下面的示例会给你第二个元素）：

pre > < DIV>
{％include'images.html'with {elementNumber：1}％}
< / div>


如果你想做一些精心制作的东西，比如如果key< elementNumber

但是，如果你一次只需要一个元素，这可能会更好，而不是for循环： p>

 < div> 
< img src ={{images [elementNumber] | url_image}}width =100height =100/> 
< / div> 
  

I have a for loop in Twig. I'm trying to access different elements in a for loop so I can use them in different places on my website.

Let'say I have a template called 'images'. Inside that template I have a for loop like so:

{% for image in images %}
<div>
  <img src="{{ image | url_image }}" width="100" height="100" />
</div>
{% endfor %}

In a different template I'm trying to include this 'images' template. So what I have is this:

{% include 'images.html' %}

The problem I'm facing right now is that I only want the second element from the for loop in the images.html template. How do you do that?

So I want something like this:

<div>
{% include 'images.html' with {'second element'} only %}
</div>

Does anyone know what the best approach is or how do you do that? I'm pretty new to Twig as you can see ;)

解决方案

You almost already found your answer!

Use the for with condition syntax:

{% for key,image in images if key==elementNumber %}
<div>
  <img src="{{ image | url_image }}" width="100" height="100" />
</div>
{% endfor %}

And call you template with the parameter's value you need (keeping in mind that key starts at 0, so the example bellow will give you the second element):

<div>
{% include 'images.html' with {elementNumber: 1} %}
</div>

This syntax is useful if you want to do some "elaborated" things like if key<elementNumber

But if you need only one element at a time, this might be better, instead of the for loop:

<div>
  <img src="{{ images[elementNumber] | url_image }}" width="100" height="100" />
</div>

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