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clearTrace
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SysDebugclearTrace();
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Appends a message to console, SysDebugfail(message); and then breaks into the debugger using the JavaScript debugger if that command is supported by the browser
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Method Name Description assert Syntax
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Evaluates a conditional SysDebugassert(condition, expression If the expression is message, displayCaller); false, a JavaScript con rmation is displayed to the user with the message provided in the assert call If the user con rms the dialog, the message is appended to the console, and if the browser supports the debugger command, the browser breaks into the JavaScript debugger
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Listing 242 provides a test page for the trace methods that we de ned in Table 27: trace, traceDump, and clearTrace The code relies on our previously de ned BooksPublishersPublisher object, which is placed in the Publisherjs le but not shown in the listing
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Listing 242 Testing SysDebug s Tracing Methods
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<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="DebugTesteraspxcs" Inherits="DebuggingDebugTester" %> <html> <head runat="server"> <title>Trace in Action!</title> <script type="text/javascript"> function trace() { SysDebugtrace($get("txtTraceMessage")value); } function traceDump() { var name = $get("txtPublisherName")value; var city = $get("txtPublisherCity")value; var myPublisher = new BooksPublishersPublisher(name, city); SysDebugtraceDump(myPublisher); } function clearTrace() { SysDebugclearTrace(); } </script> </head> <body>
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Listing 242 continued
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<form id="form1" runat="server"> <asp:ScriptManager ID="SM1" runat="server"> <Scripts> <asp:ScriptReference Path="~/Publisherjs" /> </Scripts> </asp:ScriptManager> <textarea id="TraceConsole" style="width: 400px; height: 200px;" cols="1" rows="1"> </textarea> <br /> <span>Trace Message: </span> <input type="text" id="txtTraceMessage" /> <input type="button" onclick="trace();" value="Append Trace" /> <br /> <span>Publisher Name: </span> <input type="text" id="txtPublisherName" /> <span>Publisher City: </span> <input type="text" id="txtPublisherCity" /> <input type="button" onclick="traceDump();" value="Dump Publisher Object" /> <br /> <input type="button" onclick="clearTrace();" value="Clear Trace" /> </form> </body> </html>
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Figure 29 shows the example page in action Because we de ned a textarea with ID TraceConsole in the DebugTester page, the trace commands append their information to the textarea Even if we didn t include a textarea on the page, the trace commands still append to the console What the console is depends on the executing situation Table 28 details the different consoles
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Figure 29 Debug test page in action
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Table 28 Available Debug Consoles Browser or Application Console Information
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When a debugger is attached to Internet Explorer either by directly attaching to the IExploreexe instance or by running the application through Visual Studio, trace messages will appear in the Output window when the window is set to Show Output from Debug
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Web Development Helper Once it is installed and running on the page, trace messages are appended to the script console Firefox Safari With Firebug installed, trace messages are appended to its console Once the debug menu has been added to the browser, trace messages are appended to the JavaScript console The trace messages are appended to the error console
Opera
Figures 210 through 214 show the various consoles with trace messages appended to them
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Figure 210 Web Development Helper displaying the trace messages
Figure 211 Visual Studio s output window displaying the trace messages
Figure 212 Firebug s console window displaying the trace messages
Figure 213 Safari s JavaScript console displaying the trace messages
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Figure 214 Opera s error console displaying the trace messages
The other two methods, fail and assert, work similarly to their NET counterparts SystemDiagnositcsDebugFail and SystemDiagnostics DebugAssert Important to note is that both methods break into the JavaScript debugger only if the browser supports the debugger command
SysUIDomElement The SysUIDomElement class includes commonly used methods for working with DOM elements Instead of us creating SysUIDomElement instances, static methods are attached to the class, and we use those instead Table 29 details the methods and syntax provided by the class
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Table 29 SysUIDomElement Methods Method Name getElementById or $get Description Syntax var elm = SysUIDomElement getElementById(elmId, parent);
Searches for and returns an element with the given ID within the parent element (second parameter) If no second parameter is speci ed, document is assumed $get can be used as a shortcut to the SysUIDomElement getElementById method Gets a JSON-formatted object that contains the x,y coordinates of the object in relation to the owner frame or window
var elm = $get(elmId, searchRadius);
getLocation
var location = SysUIDomElement getLocation(elm); var x = locationx; var y = locationy;
getBounds
The same as getLocation, and var bounds = also returns the width and SysUIDomElement height of the element in pixels getBounds(elm);
var x = locationx; var y = locationy; var width = locationwidth; var height = locationheight;