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How to Log Javascript Errors in C#

, 29 Dec 2011 CPOL
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Logging client side JavaScript errors to the server.

This code shows how to handle a JavaScript error by posting the details back to the server to be logged. This code can be wired up to use any logging system.

The errors.js file establishes a handler for window.onerror to call the handleError function. The handleError function creates a web request (using the createHttpRequest function in httpRequests.js) and posts the error details back to LogJavascriptError.aspx. The LogJavascriptError.aspx file then logs the details to the file.

var applicationPath = '';
function handleError(msg, srcUrl, line){
    var receiveReq = createHttpRequest();
    var url = applicationPath + '/Admin/LogJavascriptError.aspx';
    var data  = "ErrorData=" + msg + "&SourcePage=" + srcUrl + "&Line=" + line;"POST", url, true);
    receiveReq.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
    receiveReq.setRequestHeader("Content-length", data.length);
    receiveReq.setRequestHeader("Connection", "close");

function createHttpRequest() {
    if (window.XMLHttpRequest) {
        return new XMLHttpRequest(); //Not IE
    } else if(window.ActiveXObject) {
        return new ActiveXObject("Microsoft.XMLHTTP"); //IE
    } else {
        alert("Your browser doesn't support the XmlHttpRequest object.  Please upgrade to Firefox.");

string errorData = Request.Form["ErrorData"];
string sourcePage = Request.Form["SourcePage"];
string line = Request.Form["Line"];
string full = "Javascript error: " + errorData + Environment.NewLine + 
              "Location: " + sourcePage + ", line " + line;


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


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Comments and Discussions

QuestionBe careful here Pinmembertmbgfan29-Dec-11 5:54 
AnswerRe: Be careful here PinmemberSoftwareMonkeys29-Dec-11 10:38 
GeneralRe: Be careful here Pinmemberbaskinhu3-Jan-12 4:06 
GeneralRe: Be careful here PinmemberSoftwareMonkeys3-Jan-12 11:32 

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