ag-logger

ag-logger

An AngularJS logger with configurable log levels. All logging messages are delegated to Angular's $log service.

• Demo
• Getting Started
• API Documentation
• Releases
• License

Getting Started

We use bower for dependency management. Install ag-logger into your project by running:

$ bower install ag-logger

After installing ag-logger, load the script file in your application:

<script type="text/javascript" src="bower_components/ag-logger/release/ag-logger.js"></script>

Then, add the ag-logger module as a dependency to your application:

var appModule = angular.module('app', ['ag-logger']);

Usage

Levels

There are five logging levels available:

ERROR > WARN > INFO > LOG > DEBUG

When a logger is set to a particular level, it will only log messages at that are logged at a level greater than or equal to the level it's configured at. For instance, if the logger is set to WARN level, it will log ERROR and WARN messages. If the logger is set to ERROR level, it will only log ERROR messages.

Logging can be configured as a provider or a service (or a combination of both).

Provider agLoggerProvider

angular.module('app', ['ag-logger']).
    config(function(agLoggerProvider) {
        // sets the logger to ERROR level logging, during app configuration
        agLoggerProvider.setLogLevel(agLoggerProvider.LOG_LEVELS.ERROR);
    });

Service agLogger

angular.module('app', ['ag-logger']).
    controller('AppCtrl', AppCtrl);

function AppCtrl(agLogger) {
    initLogging();
    
    function initLogging() {
        // sets the logger to WARNING level logging, within the application code
        agLogger.setLogLevel(agLogger.LOG_LEVELS.WARN);
    }
}

Logging Messages

Messages can be logged via the agLogger service.

Note: By default, all logging levels are enabled.

angular.module('app', ['ag-logger']).
    controller('AppCtrl', AppCtrl);

function AppCtrl(agLogger) {
    testLogging();
    
    function testLogging() {
        // sets the logger to WARNING level logging, within the application code
        logger.setLogLevel(logger.LOG_LEVELS.WARN);
        logger.error('Error message');  // will be displayed in the console.
        logger.warn('Warning message'); // will be displayed in the console.
        logger.info('Info message');    // will not be displayed in the console.
        logger.log('Log message');      // will not be displayed in the console.
        logger.debug('Debug message');  // will not be displayed in the console.
    }
}

API Documentation

Note: By default, all logging levels are enabled.

Provider agLoggerProvider

• property LOG_LEVELS - [string]

  Returns a dictionary of all supported logging levels.

function configFn(agLoggerProvider) {
    var LOG_LEVELS = agLoggerProvider.LOG_LEVELS;

    console.log(LOG_LEVELS.OFF);   // off
    console.log(LOG_LEVELS.ERROR); // error
    console.log(LOG_LEVELS.WARN);  // warn
    console.log(LOG_LEVELS.INFO);  // info
    console.log(LOG_LEVELS.LOG);   // log
    console.log(LOG_LEVELS.DEBUG); // debug
    console.log(LOG_LEVELS.ALL);   // all
}

Note: LOG_LEVELS.OFF and LOG_LEVELS.ALL don't have corresponding log functions, they're just filter levels.

• void setLogLevel(logLevelName)

  Sets the log level.

function configFn(agLoggerProvider) {
    // these two statements are functionally equivalent
    agLoggerProvider.setLogLevel(agLoggerProvider.LOG_LEVELS.WARN);
    agLoggerProvider.setLogLevel('warn');
}

• string getLogLevel()

  Gets the current log level.

• void enableAll()

  Enables the logging of all messages.

function configFn(agLoggerProvider) {
    // these three statements are functionally equivalent
    agLoggerProvider.setLogLevel(agLoggerProvider.LOG_LEVELS.ALL);
    agLoggerProvider.setLogLevel('all');
    agLoggerProvider.enableAll();
}

• void disableAll()

  Disables the logging of all messages.

function configFn(agLoggerProvider) {
    // these three statements are functionally equivalent
    agLoggerProvider.setLogLevel(agLoggerProvider.LOG_LEVELS.OFF);
    agLoggerProvider.setLogLevel('off');
    agLoggerProvider.disableAll();
}

Service agLogger

• property LOG_LEVELS - [string]

  Returns a dictionary of all supported logging levels.

function AppCtrl(agLogger) {
    var LOG_LEVELS = agLogger.LOG_LEVELS;

    console.log(LOG_LEVELS.OFF);   // off
    console.log(LOG_LEVELS.ERROR); // error
    console.log(LOG_LEVELS.WARN);  // warn
    console.log(LOG_LEVELS.INFO);  // info
    console.log(LOG_LEVELS.LOG);   // log
    console.log(LOG_LEVELS.DEBUG); // debug
    console.log(LOG_LEVELS.ALL);   // all    
}

• void setLogLevel(logLevelName)

  Sets the log level.

function AppCtrl(agLogger) {
    // these two statements are functionally equivalent
    agLogger.setLogLevel(agLogger.LOG_LEVELS.WARN);
    agLogger.setLogLevel('warn');
}

• string getLogLevel()

  Gets the current log level.

• void enableAll()

  Enables the printing of all log levels.

function config(agLogger) {
    // these three statements are functionally equivalent
    agLogger.setLogLevel(agLogger.LOG_LEVELS.ALL);
    agLogger.setLogLevel('all');
    agLogger.enableAll();
}

• void disableAll()

  Disables the printing of all log levels.

function config(agLogger) {
    // these three statements are functionally equivalent
    agLogger.setLogLevel(agLogger.LOG_LEVELS.OFF);
    agLogger.setLogLevel('off');
    agLogger.disableAll();
}

• boolean willLog(logLevel)

  Returns a boolean representing whether the logger will log (print) messages at the provided level (depending on what the logger's current level is set at).

Logging functions

Messages will only be logged if they are logged at a level equal to or greater than the logger's configured level (see Usage).

• void error(message)

  Logs the provided message at the error level.

• void warn(message)

  Logs the provided message at the warn level.

• void info(message)

  Logs the provided message at the info level.

• void log(message)

  Logs the provided message at the log level.

• void debug(message)

  Logs the provided message at the debug level.