Report client side JS errors back to the application

TattleTale.js

// If you pash an object of the same format as `testCases` it will be merged into test cases
// requires jQuery
var objectSupport = function(additionalObjects){
  additionalObjects = typeof additionalObjects !== 'undefined' ? additionalObjects : {};
  if(!jQuery){throw new Error("clientJSError requires jQuery");}

  //takes an object path, returns true of it's available.  For Example:
  //  >objectSupported("Array.prototype.forEach")
  //  >false //false in IE7
  //
  //  >objectSupported("JSON")
  //  >false //false in IE7
  var objectSupported = function(pathString){var prev = window; var a = pathString.split(/\./); for (var i in a){if(!prev){break;};prev = prev[a[i]]}; return !!prev};
  
  //http://pointedears.de/scripts/test/es-matrix/
  var testCases = {
    "Array":null,
    "Array.isArray":null,
    "Array.prototype.every":null,
    "Array.prototype.filter":null,
    "Array.prototype.indexOf":null,
    "Array.prototype.join":null,
    "Array.prototype.lastIndexOf":null,
    "Array.prototype.push":null,
    "Array.prototype.reduce":null,
    "Array.prototype.reduceRight":null,
    "Array.prototype.slice":null,
    "Array.prototype.some":null,
    "Array.prototype.splice":null,
    "Array.prototype.toSource":null,
    "Array.prototype.toString":null,
    "Array.prototype.concat":null,
    "Array.prototype.forEach":null,
    "Array.prototype.pop":null,
    "Array.prototype.map":null,
    "Array.prototype.reverse":null,
    "Array.prototype.shift":null,
    "Array.prototype.sort":null,
    "Array.prototype.unshift":null,

    "JSON":null,
    "JSON.parse":null,
    "JSON.stringify":null,

    "console":null,
    "console.log":null,
    
    "Date":null,
    "Date.now":null,
    "Date.prototype.toISOString":null,
    "Date.prototype.toJSON":null,

    "Object":null,
    "Object.keys":null,
    "Object.defineProperty":null,
    "Object.defineProperties":null,
    "Object.getOwnPropertyNames":null,
    "Object.getPrototypeOf":null

    
  };
  $.extend(testCases, additionalObjects);

  for (var i in testCases){
    testCases[i] = objectSupported(i);
  }
  return testCases;
}

window.onerror = function(message, url, line){
 $.post('/app/client-error',
   {message:message,
    url:url,
    line:line,
    browser:$.browser,
    objectsSupported:objectSupport()} );
}