Unexpected error in log4javascript on IE8: Expected function not found

I'm attempting to redirect console calls to the log4javascript library.

Essentially, any usage of console.log should trigger log.info, with log being an instance of Log4javascript.

However, when log.info is invoked, I encounter a "Fonction attendue" error (French), indicating "Function expected".

Even trying to execute log.info from the IE8 console leads to the same issue.

I don't believe the problem lies within the script itself, but just in case, here it is:

(function (fallback) {

    fallback = fallback || function () { };

    // Function for trapping most console functions from the FireBug Console API.
    var trap = function () {
        // Create array from arguments object
        var args = Array.prototype.slice.call(arguments);
        // Capturing raw args without converting to string
        console.raw.push(args);
        var message = args.join(' ');
        console.messages.push(message);
        fallback(message);
    };

    // Redefining console
    if (typeof console === 'undefined') {
        console = {
            messages: [],
            raw: [],
            dump: function() { return console.messages.join('\n'); },
            log: trap,
            debug: trap,
            info: trap,
            warn: trap,
            error: trap,
            assert: trap,
            clear: function() {
                console.messages.length = 0;
                console.raw.length = 0 ;
            },
            dir: trap,
            dirxml: trap,
            trace: trap,
            group: trap,
            groupCollapsed: trap,
            groupEnd: trap,
            time: trap,
            timeEnd: trap,
            timeStamp: trap,
            profile: trap,
            profileEnd: trap,
            count: trap,
            exception: trap,
            table: trap
        };
    }

})(log.info);

I believed that Log4Javascript was compatible with IE8, so what could be causing this issue? Appreciate any insights.

Answer №1

log4javascript indeed provides support for IE 8. The issue lies in the incorrect usage of this in the log.info call. This method expects to be invoked as a function with a reference to log, which should be the value of this. To resolve this, I recommend passing the logger object into your Immediately Invoked Function Expression (IIFE) and then calling its info method as follows:

(function (log) {
    var fallback = log ?
            function() {
                var args = Array.prototype.slice.call(arguments);
                log.info.apply(log, args);
            } :
            function() { };

    // Function to intercept most console functions from the FireBug Console API.
    var trap = function () {
        var args = Array.prototype.slice.call(arguments);
        console.raw.push(args);
        var message = args.join(' ');
        console.messages.push(message);
        fallback(message);
    };

    // Redefine console if it is undefined
    if (typeof window.console === 'undefined') {
        window.console = {
            messages: [],
            raw: [],
            dump: function() { return console.messages.join('\n'); },
            log: trap,
            debug: trap,
            info: trap,
            warn: trap,
            error: trap,
            assert: trap,
            clear: function() {
                console.messages.length = 0;
                console.raw.length = 0 ;
            },
            dir: trap,
            dirxml: trap,
            trace: trap,
            group: trap,
            groupCollapsed: trap,
            groupEnd: trap,
            time: trap,
            timeEnd: trap,
            timeStamp: trap,
            profile: trap,
            profileEnd: trap,
            count: trap,
            exception: trap,
            table: trap
        };
    }
})(log);

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