Calling JavaScript object property as a constructor from ClojureScript - Stack Overflow

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I am using a JavaScript library that exposes a constructor as a property of a global object.

In JavaScript, I can call the constructor like this.

var thing = new Library.Thing();

How do I call the constructor in ClojureScript? None of these work.

; These all cause piler errors
(new (.-Thing js/Library)) ; First arg to new must be a symbol
(new (.Thing js/Library))
(new .-Thing js/Library)
(new .Thing js/Library)
(new js/Library/Thing)     ; Invalid token: js/Library/Thing

; These all pile to different JS than I am looking for
((.-Thing js/Library).) ; Library.Thing.call(null, _SLASH_);
((.Thing js/Library).)  ; Library.Thing().call(null, _SLASH_);

It works fine if I use js* but that's cheating, right?

(js* "new Library.Thing()")

What is the proper way to call a constructor function that is a property of another object?

I am using a JavaScript library that exposes a constructor as a property of a global object.

In JavaScript, I can call the constructor like this.

var thing = new Library.Thing();

How do I call the constructor in ClojureScript? None of these work.

; These all cause piler errors
(new (.-Thing js/Library)) ; First arg to new must be a symbol
(new (.Thing js/Library))
(new .-Thing js/Library)
(new .Thing js/Library)
(new js/Library/Thing)     ; Invalid token: js/Library/Thing

; These all pile to different JS than I am looking for
((.-Thing js/Library).) ; Library.Thing.call(null, _SLASH_);
((.Thing js/Library).)  ; Library.Thing().call(null, _SLASH_);

It works fine if I use js* but that's cheating, right?

(js* "new Library.Thing()")

What is the proper way to call a constructor function that is a property of another object?

• javascript
• clojurescript

Share Improve this question Follow asked Oct 23, 2013 at 4:03 Josh HeadapohlJosh Headapohl 19522 silver badges77 bronze badges

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1 Answer 1

Sorted by: Reset to default 11

If you look at http://himera.herokuapp./synonym.html you can find the specific syntax to instantiate objets in clojurescript.

I wrote this js mock library based in this documentation to make a test:

function Person(name) {
this.name = name;
}

Person.prototype.greet = function() {
return "Hello, " + this.name;
};


var f={
"hola":"hola juan",

Person:Person

};

var person=new f.Person("Juan");
alert(person.greet());

Then from clojurescript you have to use the dot syntax (but prefixing with "js/" your js global type):

(let [Person (.-Person js/f)
        juan (Person. "Juan")
        ]
    (.log js/console  (.greet juan)))

I don't mention in this answer the :externs property of your cljsbuild pilation beacuse I understand that you are including your js script library directly in your html head document. So, if this line works for you (js* "new Library.Thing()") it'll mean that the js library is available from the cljs-js-piled.
Anyway, I left an "alert" in the js mock library to check that the file is correctly loaded

I hope it works for you
Juan

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