Debugging with Web Inspector

 

You can debug Web applications using the JavaScript Debugger tool. The JavaScript Debugger is based on Webkit Web Inspector, and has been modified to support remote debugging.

 

The JavaScript Debugger supports the following panels:

 

 

 

Figure: JavaScript Debugger panels

JavaScript Debugger panels

When debugging with the emulator, the emulator communicates with the Google Chrome™ browser through the HTTP protocol.

When the JavaScript Debugger is started, the Network panel is off. To enable the Network panel and start monitoring the resource loading status, press the F5 key. This reloads the current page and displays the load time on the Network panel.

Elements Panel

The Elements panel of the JavaScript Debugger allows you to see the Web page components (the DOM tree, CSS style, and Document Object Model).

Figure: Elements panel

Elements panel

Resources Panel

The Resources panel of the JavaScript Debugger allows you to inspect resources. You can interact with frames containing resources, such as HTML, JavaScript, CSS, images, and fonts. You can also inspect HTML5 databases, local storage, cookies, and application cache.

Figure: Resources panel

Resources panel

Network Panel

The Network panel of the JavaScript Debugger allows you to inspect resources downloaded over the network. You can also inspect the HTTP header, response, cookies, and preview.

Figure: Network panel

Network panel

Sources Panel

The Sources panel of the JavaScript Debugger allows you to inspect the JavaScript source page. You can debug your JavaScript code. This panel supports watch expressions, callstack, scope variables, and break point operation. In addition, it supports basic debugging operations: continue, step over, step into, and step out.

Figure: Sources panel

Sources panel

Timeline Panel

The Timeline panel of the JavaScript Debugger allows you to perform advanced timing and speed analysis. You can see how long the browser takes to handle DOM events, and rendering and painting windows.

Figure: Timeline panel

Timeline panel

Profiles Panel

The Profiles panel of the JavaScript Debugger allows you to inspect the JavaScript performance analyses. You can inspect CPU profiles or CSS Select profiles.

Figure: Profiles panel

Profiles panel

Console Panel

The Console panel of the JavaScript Debugger allows you to inspect the JavaScript console operation. You can interact with your page programmatically. Any errors or warnings on your page are shown in the console.

Figure: Console panel

Console panel