//jsloader.js

(function() {

    var scriptManager= {};
    scriptManager.loadingcount=0;

    scriptManager.loadjs=async function(pth) {
        var resolve;
        var reject;
        var ret=new Promise(function(s, r) {
            resolve=s;
            reject=r;
        });
        var sc=document.createElement("script");
        sc.src=pth;
        //sc.type="text/javascript";
        if(document.readyState=="complete") {
            document.body.appendChild(sc);
        } else {
            var hfn=function() {
                window.removeEventListener("load", hfn);
                document.body.appendChild(sc);
            };
            window.addEventListener("load", hfn);
        }

        sc.addEventListener(("readyState" in sc?"readystatechange":"load"), function() {
            console.debug("script "+pth+" loaded successfully.");
            scriptManager.loadingcount--;
            sc.remove();
            resolve();
        });

        sc.addEventListener("error", function() {
            window.loadfail("script "+pth+" load failed");
            sc.remove();
            reject();
        });

        scriptManager.loadingcount++;
        return ret;
    };

    scriptManager.isDone=function() {
        return scriptManager.loadingcount==0;
    };

    scriptManager.waitAll=async function() {
        return new Promise(function(resolve, reject) {
            var i;
            i=setInterval(function() {
                if(scriptManager.loadingcount==0) {
                    clearInterval(i);
                    resolve();
                }
            }, 100);
        });
    };

    window.scriptManager=scriptManager;
})();