When you're calling functions of js-libs in clojurescript, you will face a lot
of boilerplate transformations to native js-objects and/or arrays.
The calls that I make start to look like:
(js-lib-fn (jayq.util/clj->js param1) (jayq.util/clj->js param2)
(jayq.util/clj->js param3))
where the params are cljs-datatypes, and where I want the {} to be transformed
into js-objects and the [] to become js-arrays.
I thought I was clever when I came up with the following fn:
(defn jsfn->clj [f] (fn [& params] (apply f (map jayq.util/clj->js
params))))
(def cljs-js-lib-fn (jsfn->clj js-lib-fn)
where "jsfn->clj" takes an exisiting js-fn and just calls the clj->js
transformation function on the parameters.
After that one-time assignment, you would simply use cljs-js-lib-fn… and life
is good.
This approach works a little bit, but seems to choke on those js-fn that rely
on "this" for their implementation. I've attached an error-message.
Is there a way to make this work?
I'm aware of the "this-as" macro, but it's unclear to me how to use that one in
the "jsfn->clj" function definition (?).
Are there other approaches maybe that can ease the "too much boilerplate code"
issue?
Thanks, FrankS.
Error message:
#<core$prn clojure.core$prn@714005f6>
"Error evaluating:" (ext-msg-alert "Hello" "Hoi There!!!") :as
"cljs.user.ext_msg_alert.call(null,\"Hello\",\"Hoi There!!!\");\n"
#<TypeError: Object function (title, message, fn, scope) {
return this.show({
title : title,
message : message,
buttons : Ext.MessageBox.OK,
promptConfig: false,
fn : function() {
if (fn) {
fn.apply(scope, arguments);
}
},
scope: scope
});
} has no method 'show'>
TypeError: Object function (title, message, fn, scope) {
return this.show({
title : title,
message : message,
buttons : Ext.MessageBox.OK,
promptConfig: false,
fn : function() {
if (fn) {
fn.apply(scope, arguments);
}
},
scope: scope
});
} has no method 'show'
at Function.Ext.define.alert
(http://localhost:8080/js/sencha-touch/sencha-touch-all-debug.js:66782:21)
at apply__2 (http://localhost:8080/js/main-debug.js:9185:16)
at apply (http://localhost:8080/js/main-debug.js:9269:25)
at cljs.core.pr_str.call.cljs.user.jsfn__GT_clj.G__7469__delegate (eval at
<anonymous> (http://localhost:8080/js/main-debug.js:29682:147),
<anonymous>:4:24)
at cljs.core.pr_str.call.cljs.user.jsfn__GT_clj.G__7469 (eval at
<anonymous> (http://localhost:8080/js/main-debug.js:29682:147),
<anonymous>:11:26)
at eval (eval at <anonymous>
(http://localhost:8080/js/main-debug.js:29682:147), <anonymous>:1:89)
at eval (eval at <anonymous>
(http://localhost:8080/js/main-debug.js:29682:147), <anonymous>:6:3)
at http://localhost:8080/js/main-debug.js:29682:142
at evaluate_javascript (http://localhost:8080/js/main-debug.js:29695:4)
at Object.callback (http://localhost:8080/js/main-debug.js:29760:132)
nil
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