/*JavaScript Bible, Fourth Editionby Danny Goodman John Wiley & Sons CopyRight 2001*/<HTML><TITLE>Error Dialog Control</TITLE><SCRIPT LANGUAGE="JavaScript1.1">// function with invalid variable valuefunction goWrong() { var x = fred}// turn off error dialogsfunction errOff() { window.onerror = doNothing}// turn on error dialogs with hard reloadfunction errOn() { window.onerror = handleError}// assign default error handlerwindow.onerror = handleError// error handler when errors are turned off...prevents error dialogfunction doNothing() {return true}function handleError(msg, URL, lineNum) { var errWind = window.open("","errors","HEIGHT=270,WIDTH=400") var wintxt = "<HTML><BODY BGCOLOR=RED>" wintxt += "<B>An error has occurred on this page. " wintxt += "Please report it to Tech Support.</B>" wintxt += "<FORM METHOD=POST ENCTYPE='text/plain' " wintxt += "ACTION=mailTo:support4@dannyg.com >" wintxt += "<TEXTAREA NAME='errMsg' COLS=45 ROWS=8 WRAP=VIRTUAL>" wintxt += "Error: " + msg + "n" wintxt += "URL: " + URL + "n" wintxt += "Line: " + lineNum + "n" wintxt += "Client: " + navigator.userAgent + "n" wintxt += "-----------------------------------------n" wintxt += "Please describe what you were doing when the error occurred:" wintxt += "</TEXTAREA><P>" wintxt += "<INPUT TYPE=SUBMIT VALUE='Send Error Report'>" wintxt += "<INPUT TYPE=button VALUE='Close' onClick='self.close()'>" wintxt += "</FORM></BODY></HTML>" errWind.document.write(wintxt) errWind.document.close() return true}</SCRIPT></HEAD><BODY><FORM NAME="myform"><INPUT TYPE="button" VALUE="Cause an Error" onClick="goWrong()"><P><INPUT TYPE="button" VALUE="Turn Off Error Dialogs" onClick="errOff()"><INPUT TYPE="button" VALUE="Turn On Error Dialogs" onClick="errOn()"></FORM></BODY></HTML>
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