Firebug使用之一--Console Panel

Console Panel

Console Panel

The console panel offers a JavaScript command line, lists all kinds of messages and offers a profiler for JavaScript commands.

Contents

 [hide]

• 1 Options Menu
• 2 Panel Toolbar
  • 2.1 Break On All Errors
  • 2.2 Clear
  • 2.3 Persist
  • 2.4 Profile
  • 2.5 Filter buttons
• 3 Command Line
  • 3.1 Command Editor
  • 3.2 Smart paste
• 4 Console
  • 4.1 Click functionality
  • 4.2 Profiling
• 5 See also

[edit]Options Menu

This menu is reachable via the little arrow in the panel tab (  ) or by right-clicking on on the panel tab (since Firebug 1.9).

OptionPreferenceDescriptionEnabledextensions.firebug.console.enableSitesEnables the Console PanelDisabledextensions.firebug.console.enableSitesDisables the Console PanelShow JavaScript Errorsextensions.firebug.showJSErrorsToggles logging of JavaScript error messages into the consoleShow JavaScript Warningsextensions.firebug.showJSWarningsToggles logging of JavaScript warning messages into the consoleShow CSS Errorsextensions.firebug.showCSSErrorsToggles logging of CSS error messages into the consoleShow XML/HTML Errorsextensions.firebug.showXMLErrorsToggles logging of XML and HTML error messages into the consoleShow XMLHttpRequestsextensions.firebug.showXMLHttpRequestsToggles logging of XMLHttpRequests into the console; see the Net Panel for more infoShow Chrome Errorsextensions.firebug.showChromeErrorsToggles logging of program and add-on internal error messages into the consoleShow Chrome Messagesextensions.firebug.showChromeMessagesToggles logging of program and add-on internal messages into the consoleShow External Errorsextensions.firebug.showExternalErrorsToggles logging of external error messages into the consoleShow Network Errorsextensions.firebug.showNetworkErrorsToggles logging of network error messages into the consoleShow Stack Trace With Errorsextensions.firebug.service.showStackTraceToggles the inclusion of the stack trace for error messagesShow Cookie Eventsextensions.firebug.cookies.logEventsToggles logging of cookie events into the console; see the Cookies Panel for more infoStrict Warnings (performance penalty)javascript.options.strictToggles logging of strict warnings into the consoleCommand Editorextensions.firebug.commandEditorToggles between the Command Line and the Command EditorShow Completion List Popupextensions.firebug.commandLineShowCompleterPopupToggles the auto-completion of commands while typing

For more info about tweaks available in Firebug please see the full list of preferences.

[edit]Panel Toolbar

[edit]Break On All Errors

As with some of the other panels the console panel offers a "Break On ..." feature. In this case it's "Break On All Errors" (  ), which means that as soon as an error occurs the script execution is stopped.

[edit]Clear

Clears the console by removing all messages from the output.

[edit]Persist

This option prevents clearing the console when a page is reloaded. Thus all messages will stay inside the console as long as this option is enabled.

[edit]Profile

Enabling this option lets you profile JavaScript activity. For more info about this feature see the Profiling section.

[edit]Filter buttons

There are different buttons allowing you to filter the display of messages logged to the console:

OptionDescriptionAllDisplays all messagesErrorsLimits the display to error messagesWarningsLimits the display to warning messagesInfoLimits the display to info messagesDebug InfoLimits the display to debug info messagesCookiesLimits the display to cookie events

You can also select multiple filters by holding down Ctrl / ⌘ while clicking the filter buttons.

[edit]Command Line

The Command Line is simply used for executing JavaScript commands, but is designed to support people writing code and inspecting objects. For this reason it offers several functionalities. Thereby there are some additional features available inside the Console Panel.

[edit]Command Editor

The Command Editor offers you a bigger text field for entering JavaScript commands consisting of several lines. It has an integrated menu for running the command(s), clearing the text field and copying the contents to the clipboard.

[edit]Smart paste

If you are pasting code into the command line, that consists of several lines, the command editor is automatically opened to keep the line breaks.

[edit]Console

The console offers three different functionalities. It is showing all messages Firefox' error console is showing. Furthermore it is displaying the results of the commands you entered into the command line. Last but not least it has an integrated profiler for JavaScript activities. For a detailed description of console commands see the Console API.

[edit]Click functionality

Console messages offer you different kinds of options you can access via the mouse buttons resp. the mouse wheel. E. g. clicking on the links in an error message or warning jumps directly to the appropriate panel. Right clicking on them gives you the possibility to copy the message to the clipboard or set a breakpoint for the specific error or all errors. XML HTTP requests thereby let you copy the location or response body via the context menu. Clicking on them shows you detailed information about the request. And middle-clicking opens the requested URL in a new tab.

[edit]Profiling

The console also offers functionality to profile JavaScript activity and memory consumption information via two buttons in the Panel Toolbar. For more information please see the Profiler.

[edit]See also

• Command Line API
• Console API