Problems with dynamic loading in JavaScript -


i javascript newbie , learn working on pure javascript "project" calculates mathematical functions. works well. now, further step, want make messaging multilingual. code should capable of loading appropriate language file @ runtime. dynamic loading issue, read , found solutions on web pages this one.

before writing dynamic code, loaded statically , test code worked well. code asking making minor difference of loading "script" element.

the code run problems this.getstring function, not possible access de element in language file. @ line console.log(eval(language, tag));, error message "uncaught referenceerror: de not defined".

//file: utils/lang/js/fileutils.js function language(language) {     var __construct = function(dynamicload) {         if (typeof language == 'undefined') {             language = "en";         }         // load proper language file:         loadfile("js/resources/lang.de.js");         return;     } ()      this.getstring = function(tag, strdefault) {         console.log("getstring(" + tag + ", " + strdefault + "): ");         console.log("getstring(...): document = " + document);         console.log("getstring(...): eval(" + language + ", " + tag + ") = ");         console.log(eval(language, tag));         var strreturn = eval('eval(language).' + tag);          if (typeof strreturn != 'undefined') {             return strreturn;         } else {             return (typeof strdefault != 'undefined')                  ? strdefault                     : eval('en.' + tag);         }     } }

the static test code works not included, can access de element.

my question: how load language file de tag accessible?

thank help! 

 //file: utils/files/js/fileutils.js   function loadfile(filepathname) {       var reference = document.createelement('script');         reference.setattribute("type", "text/javascript");       reference.setattribute("src", filepathname);         if (typeof reference != 'undefined') {         document.getelementsbytagname("head")[0].appendchild(reference);       }       console.log("loadfile(\"" + filepathname + "\"): document = " + document);     }   //file: utils/lang/js/resources/lang.de.js:   de = {     pleasewait: "bitte warten..."   };     //file: utils/lang/js/resources/lang.en.js   en = {     pleasewait: "please wait..."   };     //file: utils/lang/js/testlanguage.js:   function output() {     console.log("output()");     var codes = ['de', 'en'];       (var = 0; < codes.length; i++) {       var translator = new language(codes[i]);         var message = "output(): in " + translator.getlanguage() + ": ";         message += translator.getstring('pleasewait');         console.log(message);     }   }
<!--file: utils/lang/testlang.html:-->  <!doctype html>  <html>    <head>    <meta charset="iso-8859-1">    <title>test languages</title>    <script type="text/javascript" src="../files/js/fileutils.js"></script>      <script type="text/javascript" src="js/language.js"></script>    <script type="text/javascript" src="js/testlanguage.js"></script>  </head>    <body>    <button name="outputbutton" onclick="output();">click</button>    <br>please press [f12] can see test results.  </body>    </html>

when add script tag document, not loaded synchronously. need wait file loaded before can use code in it.

you may able redesign code use script.onload callback:

var reference = document.createelement('script'); // ... reference.onload = function() {   alert("script loaded , ready"); };

but scenario, if don't have many language string may best load them statically.


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