Error Console: Difference between revisions
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<ul> | <ul> | ||
<li>Declare global variable gConsoleService: | <li>Declare global variable gConsoleService: | ||
<pre>var gConsoleService;</pre> | |||
</li> | </li> | ||
<li>Initialize it [[Dev : Extensions : onLoad|on load]]: | <li>Initialize it [[Dev : Extensions : onLoad|on load]]: | ||
<pre>gConsoleService = Components.classes['@mozilla.org/consoleservice;1'] | |||
.getService(Components.interfaces.nsIConsoleService); | .getService(Components.interfaces.nsIConsoleService);</pre> | ||
(note, you can also use toJavaScriptConsole() function to open JavaScript console on startup) | (note, you can also use toJavaScriptConsole() function to open JavaScript console on startup) | ||
</li> | </li> | ||
<li>Define a function: | <li>Define a function: | ||
<pre>function MyApp_logMessage(aMessage) { | |||
gConsoleService.logStringMessage('MyApp: ' + aMessage); | |||
}</pre> | |||
</li> | </li> | ||
<li>Use it like here: | <li>Use it like here: | ||
<pre>MyApp_logMessage('Initialized.');</pre> | |||
</li> | </li> | ||
</ul> | </ul> | ||
See also: [[Dev : Tips : Enabling dump|Using dump()]] | See also: [[Dev : Tips : Enabling dump|Using dump()]], [http://www.mozilla.org/projects/xpcom/using-consoleservice.html Using Console Service]. | ||
Revision as of 13:18, 4 October 2004
You can output information to console using the following method:
- Declare global variable gConsoleService:
var gConsoleService;
- Initialize it on load:
gConsoleService = Components.classes['@mozilla.org/consoleservice;1'] .getService(Components.interfaces.nsIConsoleService);(note, you can also use toJavaScriptConsole() function to open JavaScript console on startup)
- Define a function:
function MyApp_logMessage(aMessage) { gConsoleService.logStringMessage('MyApp: ' + aMessage); } - Use it like here:
MyApp_logMessage('Initialized.');
See also: Using dump(), Using Console Service.
