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I want to put some translations to functions in external Java Script file. It is possible to parse js file e.g. like Twig template?
I can recommend the BazingaJsTranslationBundle (the same Bundle that @smoreno suggested, but the name changed in the meantime).
If you don't want to use a Bundle, there is a nice and easy to use workaround: You can define the translated string in a HTML twig file and call it in your external JavaScript file. For example like this
{# index.html.twig #}
<html>
<head></head>
<body>
{# Your stuff #}
<script type="text/javascript">
var myTranslatedString = '{{ 'my_string'|trans }}';
</script>
</body>
</html>
# messages.en.yml
my_string: 'My Content'
// script.js
alert(myTranslatedString); // Will output 'My Content'
199
Yes. Just make yourself a whatever.js.twig file and have at it. You will need to make sure the headers and such get properly set.
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