[英]Interpolate Twig variable/attribute inside value of another Twig attribute definition
Take the following example structure: 采取以下示例结构:
{% set paths = {
...
'js': {
...
'jquery': {
'version': '1.7.2',
'cdn': 'https://ajax.googleapis.com/ajax/libs/jquery/{{paths.js.jquery.version}}/jquery.min.js',
'fallback': ....
}
}
}
%}
To access, I would normally use something like: 要访问,我通常会使用类似:
<script src="{{paths.js.jquery.cdn}}"></script>
The interpolated variable isn't recognized, you will get something like ...libs/jquery/%7B%7B%paths.js/jquery.version7D%7D/jquery.min.js...
. 无法识别插值变量,您将得到类似
...libs/jquery/%7B%7B%paths.js/jquery.version7D%7D/jquery.min.js...
。
I've tried: 我试过了:
'a': 'text{{b}}text'
, 'a': 'text{{b}}text'
, 'a': {{ ('text' ~ b ~ 'text') }}
, 'a': {{ ('text' ~ b ~ 'text') }}
, 'a': "{{ ('text' ~ b ~ 'text') }}"
, 'a': "{{ ('text' ~ b ~ 'text') }}"
, 'a': "{{ (['text', b, 'text'] | join }}"
, 'a': "{{ (['text', b, 'text'] | join }}"
, 'a': "{{ (['text', {{b}}, 'text'] | join }}"
There's not a lot of documentation on it, but from what I see, it would have to be something like this: 没有太多的文档,但是从我的角度来看,它一定是这样的:
attribute(paths, attribute(js, attribute(jquery, cdn)))
It would be fine for one level, but not an arbitrary level of depth. 只适合一个级别,但不适合任意深度。 Please correct me if I'm misunderstanding
attribute()
. 如果我误解了
attribute()
请纠正我。
'a': ('text' ~ b ~ 'text'
) is actually correct, but there cannot be curly braces around the expression (because we're already inside an expression, a variable definition). 'a': ('text' ~ b ~ 'text'
)实际上是正确的,但是表达式周围不能有花括号(因为我们已经在表达式内部,变量定义了)。
The correct way: 正确的方法:
{% set paths = {
...
'js': {
...
'jquery': {
'version': '1.7.2',
'cdn': ('https://ajax.googleapis.com/ajax/libs/jquery/' ~ paths.js.jquery.version ~ '/jquery.min.js'),
'fallback': ....
}
}
}
%}
But there is simple design mistake here; 但是这里存在简单的设计错误; when the renderer/parser comes to the
cdn
attribute definition, paths
isn't set yet. 当渲染器/解析器进入
cdn
属性定义时,尚未设置paths
。 One possible way to get around this is to declare another variable first; 解决这个问题的一种可能方法是先声明另一个变量。
{% set params= {
'jqueryversion': '1.7.2'
}
%}
{% set paths = {
...
'js': {
...
'jquery': {
'cdn': ('https://ajax.googleapis.com/ajax/libs/jquery/' ~ params.jqueryversion ~ '/jquery.min.js'),
'fallback': ....
}
}
}
%}
Obviously if paths.js.jquery.cdn
is only going to be used once then just hardcode the parent variable's value where you need it and interpolate the child variable: 显然,如果
paths.js.jquery.cdn
只会使用一次,然后就硬编码在你需要它和插值孩子变量父变量的值:
<script src="https://ajax.googleapis.com/ajax/libs/jquery/{{params.jqueryversion}}/jquery.min.js"></script>
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