Question

I need to load cross-domain JavaScript

files dynamically for bookmarklets in my site http://jsbookmarklets.com/

The solution should satisfy:

• Fetch the path of current file
• The domain of current web-page and JS file in execution are different
• The solution should be cross-browser
• Multiple scripts might be loaded at once asynchronously (that’s why the related questions mentioned below are not a fit)

I want to get the file path of currently executing JavaScript code for dynamically loading few more resources (more CSS files and JS files like custom code and jQuery, jQuery UI and Ext JS libraries) which are stored in the same/relative folder as the JavaScript Bookmarklet.

The following approach does not fit my problem:

var scripts = document.getElementsByTagName("script");
var src = scripts[scripts.length-1].src;
alert("THIS IS: "+src);

Related questions which do not fit my problem:

• Get the url of currently executing js file when dynamically loaded
• Get script path

Answer 1

The current solution that I’m using, which works, but is very lengthy:

var fnFullFilePathToFileParentPath = function(JSFullFilePath){
    var JSFileParentPath = '';
    if(JSFullFilePath) {
        JSFileParentPath = JSFullFilePath.substring(0,JSFullFilePath.lastIndexOf('/')+1);
    } else {
        JSFileParentPath = null;
    }
    return JSFileParentPath;
};

var fnExceptionToFullFilePath = function(e){
    var JSFullFilePath = '';

    if(e.fileName) {    // firefox
        JSFullFilePath = e.fileName;
    } else if (e.stacktrace) {  // opera
        var tempStackTrace = e.stacktrace;
        tempStackTrace = tempStackTrace.substr(tempStackTrace.indexOf('http'));
        tempStackTrace = tempStackTrace.substr(0,tempStackTrace.indexOf('Dummy Exception'));
        tempStackTrace = tempStackTrace.substr(0,tempStackTrace.lastIndexOf(':'));
        JSFullFilePath = tempStackTrace;
    } else if (e.stack) {   // firefox, opera, chrome
        (function(){
            var str = e.stack;
            var tempStr = str;

            var strProtocolSeparator = '://';
            var idxProtocolSeparator = tempStr.indexOf(strProtocolSeparator)+strProtocolSeparator.length;

            var tempStr = tempStr.substr(idxProtocolSeparator);
            if(tempStr.charAt(0)=='/') {
                tempStr = tempStr.substr(1);
                idxProtocolSeparator++;
            }

            var idxHostSeparator = tempStr.indexOf('/');
            tempStr = tempStr.substr(tempStr.indexOf('/'));

            var idxFileNameEndSeparator = tempStr.indexOf(':');
            var finalStr = (str.substr(0,idxProtocolSeparator + idxHostSeparator + idxFileNameEndSeparator));
            finalStr = finalStr.substr(finalStr.indexOf('http'));
            JSFullFilePath = finalStr;
        }());
    } else {    // internet explorer
        JSFullFilePath = null;
    }

    return JSFullFilePath;
};

var fnExceptionToFileParentPath = function(e){
    return fnFullFilePathToFileParentPath(fnExceptionToFullFilePath(e));
};

var fnGetJSFileParentPath = function() {
    try {
        throw new Error('Dummy Exception');
    } catch (e) {
        return fnExceptionToFileParentPath(e);
    }
};

var JSFileParentPath = fnGetJSFileParentPath();
alert('File parent path: ' + JSFileParentPath);