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Playframework Html, Variable Into Javascript?

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Imagine a simple Play Action defined as def reactTest = Action { request => Ok(views.html.hello('JOHN')) } and the hello.scala.html looks like this, using a basic React.js

Solution 1:

You can save whatever you want in a global JS variable and then access it whenever you need.

For example, suppose you want to use a user object in your script. Having this html template

@(user: User)

<html><body><script>varMyUserObject = {};
        MyUserObject["name"] = "@user.name";
        MyUserObject["age"] = @user.age;
    </script><!-- ... --><scriptsrc="your_component.js"></script></body>

then in your included js you could do something like this:

(function(user) {
    alert("Hello " + user.name + ". You are " + user.age + " years old");    
})(MyUserObject);

You can then improve this using a map of the values you want to use or maybe rendering your object as JSON and parsing it on JS side:

def reactTest = Action {
    request =>Ok(views.html.hello(Json.toJson(user)))
}

// and then

@(user: String)

<html>
<body><script>varMyUserObject = JSON.parse("@user");
    </script><!-- ... --><scriptsrc="your_component.js"></script></body>

Not perfect, but better than rendering that on the JS files IMO.

Solution 2:

The @routes... in:

<scripttype="text/jsx"src="@routes.Assets.at("javascripts/hello.js"></script>

can be changed to:

@routes.YourController.withModel("javascripts/hello.js", model)

Then in YourController.withModel you can preprocess hello.js (such as using a templating sbt-web plugin) with the model.

You can alternatively preprocess the JS with the model before passing into this Scala HTML template.

If CPU/memory is a major concern, this can become advanced: e.g., mapping between predetermined models and preprocessed static JS files, and referencing them instead. Or use other caching/CDN techniques.

So, these are just ideas in addition to the other answers given here. Enjoy.

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