longer

Some pages may need users to input date values. It would be nice if the users just need to click and pick and done. This way we may also eliminate the possible input errors. Below is the code I used to implement this. You may want to save it as datepicker.js for other web pages to use. I also attached 3 files for you to download. All you need to do is unzip the 3 files to a directory under any web server and start trying it. If you are using jsp, you can refer to the submited field by adding something like request.getParameter("date1") to your page. If you're using php, you may try $_REQUEST["date1"] to get the value out of the submited form field. Of course you have to rename the html file to .jsp or .php. var winCal;var dtToday=new Date();var Cal;var docCal;var MonthName=["January", "February", "March", "April", "May", "June","July", "August", "September", "October", "November", "December"];var WeekDayName=["Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"]; var exDateTime;//Existing Date and Time//Configurable parametersvar cnTop="200";//top coordinate of calendar window.var cnLeft="500";//left coordinate of calendar windowvar WindowTitle ="DateTime Picker";//Date Time Picker title.var WeekChar=2;//number of character for week day. if 2 then Mo,Tu,We. if 3 then Mon,Tue,Wed.var CellWidth=20;//Width of day cell.var DateSeparator="/";//Date Separator, you can change it to "/" if you want.var TimeMode=24;//default TimeMode value. 12 or 24var ShowLongMonth=true;//Show long month name in Calendar header. example: "January".var ShowMonthYear=true;//Show Month and Year in Calendar header.var MonthYearColor="#cc0033";//Font Color of Month and Year in Calendar header.var WeekHeadColor="#0099CC";//Background Color in Week header.var SundayColor="#6699FF";//Background color of Sunday.var SaturdayColor="#CCCCFF";//Background color of Saturday.var WeekDayColor="white";//Background color of weekdays.var FontColor="blue";//color of font in Calendar day cell.var TodayColor="#FFFF33";//Background color of today.var SelDateColor="#FFFF99";//Backgrond color of selected date in textbox.var YrSelColor="#cc0033";//color of font of Year selector.var ThemeBg="";//Background image of Calendar window.//end Configurable parameters//end Global variablefunction NewCal(pCtrl,pFormat,pShowTime,pTimeMode){ Cal=new Calendar(dtToday); if ((pShowTime!=null) && (pShowTime)) { Cal.ShowTime=true; if ((pTimeMode!=null) &&((pTimeMode=='12')||(pTimeMode=='24'))) { TimeMode=pTimeMode; } } if (pCtrl!=null) Cal.Ctrl=pCtrl; if (pFormat!=null) Cal.Format=pFormat.toUpperCase(); exDateTime=document.getElementById(pCtrl).value; if (exDateTime!="")//Parse Date String { var Sp1;//Index of Date Separator 1 var Sp2;//Index of Date Separator 2 var tSp1;//Index of Time Separator 1 var tSp1;//Index of Time Separator 2 var strMonth; var strDate; var strYear; var intMonth; var YearPattern; var strHour; var strMinute; var strSecond; //parse month Sp1=exDateTime.indexOf(DateSeparator,0) Sp2=exDateTime.indexOf(DateSeparator,(parseInt(Sp1)+1)); if ((Cal.Format.toUpperCase()=="DDMMYYYY") || (Cal.Format.toUpperCase()=="DDMMMYYYY")) { strMonth=exDateTime.substring(Sp1+1,Sp2); strDate=exDateTime.substring(0,Sp1); } else if ((Cal.Format.toUpperCase()=="MMDDYYYY") || (Cal.Format.toUpperCase()=="MMMDDYYYY")) { strMonth=exDateTime.substring(0,Sp1); strDate=exDateTime.substring(Sp1+1,Sp2); } if (isNaN(strMonth)) intMonth=Cal.GetMonthIndex(strMonth); else intMonth=parseInt(strMonth,10)-1; if ((parseInt(intMonth,10)>=0) && (parseInt(intMonth,10)<12)) Cal.Month=intMonth; //end parse month //parse Date if ((parseInt(strDate,10)<=Cal.GetMonDays()) && (parseInt(strDate,10)>=1)) Cal.Date=strDate; //end parse Date //parse year strYear=exDateTime.substring(Sp2+1,Sp2+5); YearPattern=/^\d{4}$/; if (YearPattern.test(strYear)) Cal.Year=parseInt(strYear,10); //end parse year //parse time if (Cal.ShowTime==true) { tSp1=exDateTime.indexOf(":",0) tSp2=exDateTime.indexOf(":",(parseInt(tSp1)+1)); strHour=exDateTime.substring(tSp1,(tSp1)-2); Cal.SetHour(strHour); strMinute=exDateTime.substring(tSp1+1,tSp2); Cal.SetMinute(strMinute); strSecond=exDateTime.substring(tSp2+1,tSp2+3); Cal.SetSecond(strSecond); } } winCal=window.open("","DateTimePicker","toolbar=0,status=0,menubar=0,fullscreen=no,width=195,height=245,resizable=0,top="+cnTop+",left="+cnLeft); docCal=winCal.document; RenderCal();}function RenderCal(){ var vCalHeader; var vCalData; var vCalTime; var i; var j; var SelectStr; var vDayCount=0; var vFirstDay; docCal.open(); docCal.writeln("<html><head><title>"+WindowTitle+"</title>"); docCal.writeln("<script>var winMain=window.opener;</script>"); docCal.writeln("</head><body background='"+ThemeBg+"' link="+FontColor+" vlink="+FontColor+"><form name='Calendar'>"); vCalHeader="<table border=1 cellpadding=1 cellspacing=1 width='100%' align=\"center\" valign=\"top\">\n"; //Month Selector vCalHeader+="<tr>\n<td colspan='7'><table border=0 width='100%' cellpadding=0 cellspacing=0><tr><td align='left'>\n"; vCalHeader+="<select name=\"MonthSelector\" onChange=\"java script:winMain.Cal.SwitchMth(this.selectedIndex);winMain.RenderCal();\">\n"; for (i=0;i<12;i++) { if (i==Cal.Month) SelectStr="Selected"; else SelectStr=""; vCalHeader+="<option "+SelectStr+" value >"+MonthName[i]+"\n"; } vCalHeader+="</select></td>"; //Year selector vCalHeader+="\n<td align='right'><a href=\"java script:winMain.Cal.DecYear();winMain.RenderCal()\"><b><font color=\""+YrSelColor+"\"><</font></b></a><font face=\"Verdana\" color=\""+YrSelColor+"\" size=2><b> "+Cal.Year+" </b></font><a href=\"java script:winMain.Cal.IncYear();winMain.RenderCal()\"><b><font color=\""+YrSelColor+"\">></font></b></a></td></tr></table></td>\n"; vCalHeader+="</tr>"; //Calendar header shows Month and Year if (ShowMonthYear) vCalHeader+="<tr><td colspan='7'><font face='Verdana' size='2' align='center' color='"+MonthYearColor+"'><b>"+Cal.GetMonthName(ShowLongMonth)+" "+Cal.Year+"</b></font></td></tr>\n"; //Week day header vCalHeader+="<tr bgcolor="+WeekHeadColor+">"; for (i=0;i<7;i++) { vCalHeader+="<td align='center'><font face='Verdana' size='2'>"+WeekDayName[i].substr(0,WeekChar)+"</font></td>"; } vCalHeader+="</tr>"; docCal.write(vCalHeader); //Calendar detail CalDate=new Date(Cal.Year,Cal.Month); CalDate.setDate(1); vFirstDay=CalDate.getDay(); vCalData="<tr>"; for (i=0;i<vFirstDay;i++) { vCalData=vCalData+GenCell(); vDayCount=vDayCount+1; } for (j=1;j<=Cal.GetMonDays();j++) { var strCell; vDayCount=vDayCount+1; if ((j==dtToday.getDate())&&(Cal.Month==dtToday.getMonth())&&(Cal.Year==dtToday.getFullYear())) strCell=GenCell(j,true,TodayColor);//Highlight today's date else { if (j==Cal.Date) { strCell=GenCell(j,true,SelDateColor); } else { if (vDayCount%7==0) strCell=GenCell(j,false,SaturdayColor); else if ((vDayCount+6)%7==0) strCell=GenCell(j,false,SundayColor); else strCell=GenCell(j,null,WeekDayColor); } } vCalData=vCalData+strCell; if((vDayCount%7==0)&&(j<Cal.GetMonDays())) { vCalData=vCalData+"</tr>\n<tr>"; } } docCal.writeln(vCalData); //Time picker if (Cal.ShowTime) { var showHour; showHour=Cal.getShowHour(); vCalTime="<tr>\n<td colspan='7' align='center'>"; vCalTime+="<input type='text' name='hour' maxlength=2 size=1 style=\"WIDTH: 22px\" value="+showHour+" onchange=\"java script:winMain.Cal.SetHour(this.value)\">"; vCalTime+=" : "; vCalTime+="<input type='text' name='minute' maxlength=2 size=1 style=\"WIDTH: 22px\" value="+Cal.Minutes+" onchange=\"java script:winMain.Cal.SetMinute(this.value)\">"; vCalTime+=" : "; vCalTime+="<input type='text' name='second' maxlength=2 size=1 style=\"WIDTH: 22px\" value="+Cal.Seconds+" onchange=\"java script:winMain.Cal.SetSecond(this.value)\">"; if (TimeMode==12) { var SelectAm =(parseInt(Cal.Hours,10)<12)? "Selected":""; var SelectPm =(parseInt(Cal.Hours,10)>=12)? "Selected":""; vCalTime+="<select name=\"ampm\" onchange=\"java script:winMain.Cal.SetAmPm(this.options[this.selectedIndex].value);\">"; vCalTime+="<option "+SelectAm+" value=\"AM\">AM</option>"; vCalTime+="<option "+SelectPm+" value=\"PM\">PM<option>"; vCalTime+="</select>"; } vCalTime+="\n</td>\n</tr>"; docCal.write(vCalTime); } //end time picker docCal.writeln("\n</table>"); docCal.writeln("</form></body></html>"); docCal.close();}function GenCell(pValue,pHighLight,pColor)//Generate table cell with value{ var PValue; var PCellStr; var vColor; var vHLstr1;//HighLight string var vHlstr2; var vTimeStr; if (pValue==null) PValue=""; else PValue=pValue; if (pColor!=null) vColor="bgcolor=\""+pColor+"\""; else vColor=""; if ((pHighLight!=null)&&(pHighLight)) {vHLstr1="color='red'><b>";vHLstr2="</b>";} else {vHLstr1=">";vHLstr2="";} if (Cal.ShowTime) { vTimeStr="winMain.document.getElementById('"+Cal.Ctrl+"').value+=' '+"+"winMain.Cal.getShowHour()"+"+':'+"+"winMain.Cal.Minutes"+"+':'+"+"winMain.Cal.Seconds"; if (TimeMode==12) vTimeStr+="+' '+winMain.Cal.AMorPM"; } else vTimeStr=""; PCellStr="<td "+vColor+" width="+CellWidth+" align='center'><font face='verdana' size='2'"+vHLstr1+"<a href=\"java script:winMain.document.getElementById('"+Cal.Ctrl+"').value='"+Cal.FormatDate(PValue)+"';"+vTimeStr+";window.close();\">"+PValue+"</a>"+vHLstr2+"</font></td>"; return PCellStr;}function Calendar(pDate,pCtrl){ //Properties this.Date=pDate.getDate();//selected date this.Month=pDate.getMonth();//selected month number this.Year=pDate.getFullYear();//selected year in 4 digits this.Hours=pDate.getHours(); if (pDate.getMinutes()<10) this.Minutes="0"+pDate.getMinutes(); else this.Minutes=pDate.getMinutes(); if (pDate.getSeconds()<10) this.Seconds="0"+pDate.getSeconds(); else this.Seconds=pDate.getSeconds(); this.MyWindow=winCal; this.Ctrl=pCtrl; this.Format="ddMMyyyy"; this.Separator=DateSeparator; this.ShowTime=false; if (pDate.getHours()<12) this.AMorPM="AM"; else this.AMorPM="PM"; }function GetMonthIndex(shortMonthName){ for (i=0;i<12;i++) { if (MonthName[i].substring(0,3).toUpperCase()==shortMonthName.toUpperCase()) { return i;} }}Calendar.prototype.GetMonthIndex=GetMonthIndex;function IncYear(){ Cal.Year++;}Calendar.prototype.IncYear=IncYear;function DecYear(){ Cal.Year--;}Calendar.prototype.DecYear=DecYear; function SwitchMth(intMth){ Cal.Month=intMth;}Calendar.prototype.SwitchMth=SwitchMth;function SetHour(intHour){ var MaxHour; var MinHour; if (TimeMode==24) { MaxHour=23;MinHour=0} else if (TimeMode==12) { MaxHour=12;MinHour=1} else alert("TimeMode can only be 12 or 24"); var HourExp=new RegExp("^\\d\\d$"); if (HourExp.test(intHour) && (parseInt(intHour,10)<=MaxHour) && (parseInt(intHour,10)>=MinHour)) { if ((TimeMode==12) && (Cal.AMorPM=="PM")) { if (parseInt(intHour,10)==12) Cal.Hours=12; else Cal.Hours=parseInt(intHour,10)+12; } else if ((TimeMode==12) && (Cal.AMorPM=="AM")) { if (intHour==12) intHour-=12; Cal.Hours=parseInt(intHour,10); } else if (TimeMode==24) Cal.Hours=parseInt(intHour,10); }}Calendar.prototype.SetHour=SetHour;function SetMinute(intMin){ var MinExp=new RegExp("^\\d\\d$"); if (MinExp.test(intMin) && (intMin<60)) Cal.Minutes=intMin;}Calendar.prototype.SetMinute=SetMinute;function SetSecond(intSec){ var SecExp=new RegExp("^\\d\\d$"); if (SecExp.test(intSec) && (intSec<60)) Cal.Seconds=intSec;}Calendar.prototype.SetSecond=SetSecond;function SetAmPm(pvalue){ this.AMorPM=pvalue; if (pvalue=="PM") { this.Hours=(parseInt(this.Hours,10))+12; if (this.Hours==24) this.Hours=12; } else if (pvalue=="AM") this.Hours-=12; }Calendar.prototype.SetAmPm=SetAmPm;function getShowHour(){ var finalHour; if (TimeMode==12) { if (parseInt(this.Hours,10)==0) { this.AMorPM="AM"; finalHour=parseInt(this.Hours,10)+12; } else if (parseInt(this.Hours,10)==12) { this.AMorPM="PM"; finalHour=12; } else if (this.Hours>12) { this.AMorPM="PM"; if ((this.Hours-12)<10) finalHour="0"+((parseInt(this.Hours,10))-12); else finalHour=parseInt(this.Hours,10)-12; } else { this.AMorPM="AM"; if (this.Hours<10) finalHour="0"+parseInt(this.Hours,10); else finalHour=this.Hours; } } else if (TimeMode==24) { if (this.Hours<10) finalHour="0"+parseInt(this.Hours,10); else finalHour=this.Hours; } return finalHour; } Calendar.prototype.getShowHour=getShowHour; function GetMonthName(IsLong){ var Month=MonthName[this.Month]; if (IsLong) return Month; else return Month.substr(0,3);}Calendar.prototype.GetMonthName=GetMonthName;function GetMonDays()//Get number of days in a month{ var DaysInMonth=[31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]; if (this.IsLeapYear()) { DaysInMonth[1]=29; } return DaysInMonth[this.Month]; }Calendar.prototype.GetMonDays=GetMonDays;function IsLeapYear(){ if ((this.Year%4)==0) { if ((this.Year%100==0) && (this.Year%400)!=0) { return false; } else { return true; } } else { return false; }}Calendar.prototype.IsLeapYear=IsLeapYear;function FormatDate(pDate){ if (this.Format.toUpperCase()=="DDMMYYYY") return (pDate+DateSeparator+(this.Month+1)+DateSeparator+this.Year); else if (this.Format.toUpperCase()=="DDMMMYYYY") return (pDate+DateSeparator+this.GetMonthName(false)+DateSeparator+this.Year); else if (this.Format.toUpperCase()=="MMDDYYYY") return ((this.Month+1)+DateSeparator+pDate+DateSeparator+this.Year); else if (this.Format.toUpperCase()=="MMMDDYYYY") return (this.GetMonthName(false)+DateSeparator+pDate+DateSeparator+this.Year); }Calendar.prototype.FormatDate=FormatDate; And below is an example of html file that uses the script: <html><head><script src="datepicker.js"></script></head><body>Pick a Date:<form><input id="date1" type="text" name="date1" size="8" maxlength="10"><a href="java script:NewCal('date1','mmddyyyy',false)"><img src="cal.gif" width="16" height="16" border="0" alt="Pick a date"></a></form></body></html> datepicker.zip

I recently installed PEAR into a PHP environment on a Linux machine, and as I did the installation I wrote down the steps for future use. I thought it might be useful for others. PEAR stands for PHP Extension and Application Repository. Basically I just use it for replacing php database connection functions. Download the go-pear.php script from http://forums.xisto.com/no_longer_exists/. Open a command line shell and run the script: CONSOLE php go-pear.php

We actually use both Windows and Linux. The reason is obvious - Linux is free so we use it for all the servers and Windows is convenient so we put it on all workstations and laptops. Linux means endless compilation and installation to me though. I'd like to thank those who contribute to all the build files...I don't have to pay a cent for that.

Usually I only write my code in my local box and upload to the remote box to test using some kind of pscp batch script. My local machine is Windows box and the remote server is Linux so the configuration is different. I prefer this way because I have too many apps installed in my local box and it's getting slower and slower. I will have to upgrade my box soon...

Here, if you find garbage in your neighbor?s backyard, you can request it to be removed in a timely fashion or you can call the heath department of the township...well, I guess you most of the time you don't have to do that

I always use classes to hold constants instead of interfaces. Recently my co-worker started using Interface to hold constants for the same project.I think it's good to share with him some points of view from the following books which justify why should you avoid 'Constant Interface':Philip Heller and Simon Roberts, "Complete Java 2 Certification StudyGuide":"In the first place, to say that a class implements an interface really means that the class exposes the public methods listed in theinterface. Interfaces are for defining types and should be used exclusively for that purpose. Constant interfaces only contain data, so they definitely don?t define types.The second disadvantage is a bit more complicated. Suppose someone you work with writes some code that uses an instance of Scales. This person can legally reference that instance with a variable of type Conversion, even though doing so would be quite inappropriate. Later, if you wanted to eliminate the Conversion interface, you couldn?t do so, because your misguided colleague would be relying on the existence of the interface."Joshua Bloch, "Effective Java - Programming Language Guide":"The constant interface pattern is a poor use of interfaces. That a class uses some constants internally is an implementation detail. Implementing a constant interface causes this implementation detail to leak into the class's exported API. It is of no consequence to the users of a class that the class implements a constant interface. In fact, it may even confuse them. Worse, it represents a commitment: if in a future release the class is modified so that it no longer needs to use the constants, it still must implement the interface to ensure binary compatibility. If a nonfinal class implements a constant interface, all of its subclasses will have their namespaces polluted by the constants in the interface."Although it's like preference for different people, Interface is for defining types, and not solely for holding constants.Further more, we can use import static in Java 5 so we can type as less as using interface. Finally he accepts the changes and move to his code from interface to class:)

If you travel a lot and have to carry a normal size laptop, you'll see getting an EEE isn't a bad idea.

This is pretty good option. We don't have too many I/O operations in the app that's why we decided to use LinkedBlockingQueue<Runnable>. Maybe we should try synchronization statement and SynchronousQueue to see the performance difference. Thanks for your suggestion.

So we have a web based application running on JBoss on several clustered servers. The front end of the application is using jms to communicate with the middleware MDB, which communicates with other backend application servers. The application runs well when only a few requests are submited. However, when requests boost to couple thousands, the app starts to crash. The log files shows a concurrency issue with the ThreadPoolExecutor. When we set the core size pool to one the issue was solved. Looks like we have concurrent issue of multiple threads accessing same resource simultaneously. We have to look into it for a better solution. Maybe synchronizing the method that accesses the same resource will be a better solution. Any suggestions?

I like your idea of being a programmer. So I was a programmer ananlyst then a system architect. I'd rather be fishing some days so I don't have to sit in front of the computer the whole day.

27 GB is OK if you're not installing too much stuff. If you're a gamer, I guess you need one with at least 80GB space.

Agreed. They're only some of the very basic concepts. Also something like multithreading could be a topic as well. It's not possible to include all aspects in one article though.