Using Javascript variable in Twig template using Silex framework

Question

I am trying to create a route inside of some Javascript inside of a Twig template and need to use a JS variable as a value to a route parameter.

Example:

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Answer 1

Twig, since it's written in PHP, runs on the server, completely separately than the javascript code, so what you want needs a workaround.

First, generate the route, but with a placeholder, then replace that with the value of your variable when neccessary:

var route = "{{ path('post_display', { 'id': "PLACEHOLDER" }) }}";
window.location = route.replace("PLACEHOLDER", js_variable);

Something like this should work for you.