AJAX - The Complete Reference

Chapter 2: Pre-Ajax JavaScript Communications Techniques 51

PART I

{

encodedVal = escape(val);

/* fix the omissions */

encodedVal = encodedVal.replace(/@/g,"%40");

encodedVal = encodedVal.replace(/\//g,"%2F");

encodedVal = encodedVal.replace(/\+/g,"%2B");

}

else

{

encodedVal = encodeURIComponent(val);

/* fix the omissions */

encodedVal = encodedVal.replace(/~/g,"%7E");

encodedVal = encodedVal.replace(/!/g,"%21");

encodedVal = encodedVal.replace(/\(/g,"%28");

encodedVal = encodedVal.replace(/\)/g,"%29");

encodedVal = encodedVal.replace(/'/g,"%27");

}

/* clean up the spaces and return */

return encodedVal.replace(/\%20/g, "+");

}

AjaxTCRExamples.reportJSError = function (errorMessage,url,lineNumber)

{

function sendRequest(url,payload)

{

var img = new Image();

img.src = url+"?"+payload;

}

/* form payload string with error data */

var payload = "url=" + AjaxTCRExamples.encodeValue(url);

payload += "&message=" + AjaxTCRExamples.encodeValue(errorMessage);

payload += "&line=" + AjaxTCRExamples.encodeValue(lineNumber);

/* submit error message */

sendRequest(AjaxTCRExamples.errorReportingURL,payload);

alert("JavaScript Error Encountered. \nSite Administrators have been

notified.");

return true; // suppress normal JS errors since we handled

}

AjaxTCRExamples.registerErrorHandler = function ()

{

if (window.onerror) // then one exists

{

var oldError = window.onerror;

var newErrorHandler = function (errorMessage,url,lineNumber)

{ AjaxTCRExamples.reportJSError(errorMessage,url,lineNumber);

oldError(errorMessage,url,lineNumber); }

window.onerror = newErrorHandler;

}

else

window.onerror = AjaxTCRExamples.reportJSError;

}

/* bind the error handler */

AjaxTCRExamples.registerErrorHandler();