loadScript

by Aubrey Taylor

JavaScript

// See: https://www.nczonline.net/blog/2009/07/28/the-best-way-to-load-external-javascript/
function loadScript(url, callback){

    var script = document.createElement("script")
    script.type = "text/javascript";

    if (script.readyState){  //IE
        script.onreadystatechange = function(){
            if (script.readyState == "loaded" ||
                    script.readyState == "complete"){
                script.onreadystatechange = null;
                callback();
            }
        };
    } else {  //Others
        script.onload = function(){
            callback();
        };
    }

    script.src = url;
    document.getElementsByTagName("head")[0].appendChild(script);
}

var url = "https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js"
var onScriptLoaded = function() {
		console.log("Script Loaded", _)
}

// Call loadScript
loadScript(url, onScriptLoaded);