It does not really. This extra function wrapper is being called right in
place if you'll look closely:
var on_success = function(video, ___$2, active, completed, ___$1,
map__14064, map__14064__$1, q, map__14059, map__14059__$1, app, todos) {
return function(stream) {
return video["src"] = window.URL.createObjectURL(stream);
};
}(video, ___$2, active, completed, ___$1, map__14064,
map__14064__$1, q, map__14059, map__14059__$1, app, todos);
This happens because on_success is a closure over some variables, and to
make sure everything follows Clojure scoping rules rather than JS scoping
rules, this trick with self-calling function is used.
On Mon, Sep 8, 2014 at 1:55 AM, Bobby Harris <[email protected]> wrote:
> I'm having a promblem using GetUserMedia from clojurescript.
>
> My clojurescript loks like:
>
> (let [video (.getElementById js/document "video")
> _ (js/alert video)
> success (fn [stream] (aset video "src" (.createObjectURL
> (.-URL js/window) stream)))
> error (fn [err] (. js/console (log (str "error: ") err)))
> params #js {:audio true :video true}]
> (.webkitGetUserMedia js/navigator params success error)))
>
>
> and the javascript:
>
> var video = document.getElementById("video");
> var ___$2 = alert(video);
> var on_success = function(video, ___$2, active, completed,
> ___$1, map__14064, map__14064__$1, q, map__14059, map__14059__$1, app,
> todos) {
> return function(stream) {
> return video["src"] = window.URL.createObjectURL(stream);
> };
> }(video, ___$2, active, completed, ___$1, map__14064,
> map__14064__$1, q, map__14059, map__14059__$1, app, todos);
> var on_error = function(video, ___$2, on_success, active,
> completed, ___$1, map__14064, map__14064__$1, q, map__14059,
> map__14059__$1, app, todos) {
> return function(err) {
> return console.log([cljs.core.str("navigator.getUserMedia
> error: ")].join(""), err);
> };
> }(video, ___$2, on_success, active, completed, ___$1,
> map__14064, map__14064__$1, q, map__14059, map__14059__$1, app, todos);
> var constraints = {"video":true, "audio":false};
> return navigator.webkitGetUserMedia(constraints, on_success,
> on_error);
> };
>
> There seems to be an extra function wrapper (with a mysterious interface)
> around the success method.
>
> Thanks in advance.
>
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