Error-logging for javascript on client side

Question

My project which contains a lot of pages with forms. This is a backend of banking CRM system, so any error during working process is to be captured and investigated. On the server side we have enhanced java exceptions system, but if error occurs on client side - javascript the only info we now get is an js-error window in IE or sometimes a screenshot of page made by advanced user.

Javascript code contains both Jquery-powered UI extensions and hard-coded inline event handlers and functions.

So I am asking whether any approach for capturing js-errors of any kind could be used? some additional library or something that could give me a stacktrace like firebug in Mozilla or web-console in Chrome?

Answer 1

Look into window.onerror. If you want to capture any errors, and report them to the server, then you could try an AJAX request, perhaps.

window.onerror = function(errorMessage, errorUrl, errorLine) {
    jQuery.ajax({
        type: 'POST',
        url: 'jserror.jsf',
        data: {
            msg: errorMessage,
            url: errorUrl,
            line: errorLine
        },
        success: function() {
            if (console && console.log) {
                console.log('JS error report successful.');
            }
        },
        error: function() {
            if (console && console.error) {
                console.error('JS error report submission failed!');
            }
        }
    });

    // Prevent firing of default error handler.
    return true;
}