外部JS文件中的Twig变量 [英] Twig variable in external JS file
问题描述
我想外部化我的JS代码，但是代码中有Twig变量.
要使它起作用，您有什么窍门?
I would like to externalize my JS code, but there is Twig variable in the code.
What are your tricks to make this working?
team: {{ 'Select your team'|trans }}
推荐答案
当您需要将细枝变量传递给外部javascript文件时，有两种方法
There a two approaches when you need to pass a twig variable to an external javascript file
- 在树枝模板中的脚本块内定义变量
<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<script>
var my_twig_var = {% if twig_var is defined %}'{{ twig_var }}'{% else %}null{% endif %}
</script>
<script src="scripts/functions.js"></script>
</body>
</html>
对于这种方法，我通常添加一个名为"javascript"的代码块.封锁我的主/基本模板
For this approach I usally add a block called "javascript" block in my main/base template
base.twig.html
<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
{% block body %}
{% endblock %}
{% block javascript %}
{% endblock %}
</body>
</html>
page.html.twig
{% extends base.twig.html %}
{% block body%}
<h1>Hello World</h1>
{% endblock %}
{% block javascript %}
<script>
alert('{{ twig_var|default('Hello World') }}');
</script>
{% endblock %}
- 借助
data-*属性将变量传递给javascript
- Pass the variables to javascript with the aid of
data-*attributes
<div data-foo="{{ foo }}">...</div>
$(function() {
$(document).on('click', '.button', function(e) {
console.log($('div[data-foo]').data('foo'));
});
});
旁注:如果要将对象或数组传递给twig，则始终可以使用json_encode过滤器，该过滤器会将变量转换为有效的javascript对象
Sidenote: if you want to pass an object or an array to twig you can always use the json_encode filter, which will convert the variable to a valid javascript object
如果要控制json_encode筛选器公开哪些对象属性，可以始终实现接口
If you want to have control over which object properties are exposed by the json_encode filter you can always implement the interface Serializable
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