California Chronicle | Spring Break 2008: Thinking = Globally and Acting Locally

with an ID = defined by the=0A= // global datePickerDivID variable. If such a div doesn't yet exist on = the HTML=0A= // document we're working with, add one.=0A= if (!document.getElementById(datePickerDivID)) {=0A= // don't use innerHTML to update the body, because it can cause = global variables=0A= // that are currently pointing to objects on the page to have bad = references=0A= //document.body.innerHTML +=3D "

";=0A= var newNode =3D document.createElement("div");=0A= newNode.setAttribute("id", datePickerDivID);=0A= newNode.setAttribute("class", "dpDiv");=0A= newNode.setAttribute("style", "visibility: hidden;");=0A= document.body.appendChild(newNode);=0A= }=0A= =0A= // move the datepicker div to the proper x,y coordinate and toggle the = visiblity=0A= var pickerDiv =3D document.getElementById(datePickerDivID);=0A= pickerDiv.style.position =3D "absolute";=0A= pickerDiv.style.left =3D x + "px";=0A= pickerDiv.style.top =3D y + "px";=0A= pickerDiv.style.visibility =3D (pickerDiv.style.visibility =3D=3D = "visible" ? "hidden" : "visible");=0A= pickerDiv.style.display =3D (pickerDiv.style.display =3D=3D "block" ? = "none" : "block");=0A= pickerDiv.style.zIndex =3D 10000;=0A= =0A= // draw the datepicker table=0A= refreshDatePicker(targetDateField.name, dt.getFullYear(), = dt.getMonth(), dt.getDate());=0A= }=0A= =0A= =0A= /**=0A= This is the function that actually draws the datepicker calendar.=0A= */=0A= function refreshDatePicker(dateFieldName, year, month, day)=0A= {=0A= // if no arguments are passed, use today's date; otherwise, month and = year=0A= // are required (if a day is passed, it will be highlighted later)=0A= var thisDay =3D new Date();=0A= =0A= if ((month >=3D 0) && (year > 0)) {=0A= thisDay =3D new Date(year, month, 1);=0A= } else {=0A= day =3D thisDay.getDate();=0A= thisDay.setDate(1);=0A= }=0A= =0A= // the calendar will be drawn as a table=0A= // you can customize the table elements with a global CSS style sheet,=0A= // or by hardcoding style and formatting elements below=0A= var crlf =3D "\r\n";=0A= var TABLE =3D "" + crlf;=0A= var xTABLE =3D "

" + crlf;=0A= var TR =3D "";=0A= var TR_title =3D "";=0A= var TR_days =3D "";=0A= var TR_todaybutton =3D "";=0A= var xTR =3D "" + crlf;=0A= var TD =3D "";=0A= var TD_buttons =3D "";=0A= var TD_todaybutton =3D "";=0A= var TD_days =3D "";=0A= var TD_selected =3D "" + crlf;=0A= var DIV_title =3D "

";=0A= var DIV_selected =3D "

";=0A= var xDIV =3D "

";=0A= =0A= // start generating the code for the calendar table=0A= var html =3D TABLE;=0A= =0A= // this is the title bar, which displays the month and the buttons to=0A= // go back to a previous month or forward to the next month=0A= html +=3D TR_title;=0A= html +=3D TD_buttons + getButtonCode(dateFieldName, thisDay, -1, = "<") + xTD;=0A= html +=3D TD_title + DIV_title + monthArrayLong[ thisDay.getMonth()] + = " " + thisDay.getFullYear() + xDIV + xTD;=0A= html +=3D TD_buttons + getButtonCode(dateFieldName, thisDay, 1, = ">") + xTD;=0A= html +=3D xTR;=0A= =0A= // this is the row that indicates which day of the week we're on=0A= html +=3D TR_days;=0A= for(i =3D 0; i < dayArrayShort.length; i++)=0A= html +=3D TD_days + dayArrayShort[i] + xTD;=0A= html +=3D xTR;=0A= =0A= // now we'll start populating the table with days of the month=0A= html +=3D TR;=0A= =0A= // first, the leading blanks=0A= for (i =3D 0; i < thisDay.getDay(); i++)=0A= html +=3D TD + " " + xTD;=0A= =0A= // now, the days of the month=0A= do {=0A= dayNum =3D thisDay.getDate();=0A= TD_onclick =3D " onclick=3D\"updateDateField('" + dateFieldName + = "', '" + getDateString(thisDay) + "');\">";=0A= =0A= if (dayNum =3D=3D day)=0A= html +=3D TD_selected + TD_onclick + DIV_selected + dayNum + xDIV = + xTD;=0A= else=0A= html +=3D TD + TD_onclick + dayNum + xTD;=0A= =0A= // if this is a Saturday, start a new row=0A= if (thisDay.getDay() =3D=3D 6)=0A= html +=3D xTR + TR;=0A= =0A= // increment the day=0A= thisDay.setDate(thisDay.getDate() + 1);=0A= } while (thisDay.getDate() > 1)=0A= =0A= // fill in any trailing blanks=0A= if (thisDay.getDay() > 0) {=0A= for (i =3D 6; i > thisDay.getDay(); i--)=0A= html +=3D TD + " " + xTD;=0A= }=0A= html +=3D xTR;=0A= =0A= // add a button to allow the user to easily return to today, or close = the calendar=0A= var today =3D new Date();=0A= var todayString =3D "Today is " + dayArrayMed[today.getDay()] + ", " + = monthArrayMed[ today.getMonth()] + " " + today.getDate();=0A= html +=3D TR_todaybutton + TD_todaybutton;=0A= html +=3D " ";=0A= html +=3D "";=0A= html +=3D xTD + xTR;=0A= =0A= // and finally, close the table=0A= html +=3D xTABLE;=0A= =0A= document.getElementById(datePickerDivID).innerHTML =3D html;=0A= // add an "iFrame shim" to allow the datepicker to display above = selection lists=0A= adjustiFrame();=0A= }=0A= =0A= =0A= /**=0A= Convenience function for writing the code for the buttons that bring us = back or forward=0A= a month.=0A= */=0A= function getButtonCode(dateFieldName, dateVal, adjust, label)=0A= {=0A= var newMonth =3D (dateVal.getMonth () + adjust) % 12;=0A= var newYear =3D dateVal.getFullYear() + parseInt((dateVal.getMonth() + = adjust) / 12);=0A= if (newMonth < 0) {=0A= newMonth +=3D 12;=0A= newYear +=3D -1;=0A= }=0A= =0A= return "";=0A= }=0A= =0A= =0A= /**=0A= Convert a JavaScript Date object to a string, based on the dateFormat = and dateSeparator=0A= variables at the beginning of this script library.=0A= */=0A= function getDateString(dateVal)=0A= {=0A= var dayString =3D "00" + dateVal.getDate();=0A= var monthString =3D "00" + (dateVal.getMonth()+1);=0A= dayString =3D dayString.substring(dayString.length - 2);=0A= monthString =3D monthString.substring(monthString.length - 2);=0A= =0A= switch (dateFormat) {=0A= case "dmy" :=0A= return dayString + dateSeparator + monthString + dateSeparator + = dateVal.getFullYear();=0A= case "ymd" :=0A= return dateVal.getFullYear() + dateSeparator + monthString + = dateSeparator + dayString;=0A= case "mdy" :=0A= default :=0A= return monthString + dateSeparator + dayString + dateSeparator + = dateVal.getFullYear();=0A= }=0A= }=0A= =0A= =0A= /**=0A= Convert a string to a JavaScript Date object.=0A= */=0A= function getFieldDate(dateString)=0A= {=0A= var dateVal;=0A= var dArray;=0A= var d, m, y;=0A= =0A= try {=0A= dArray =3D splitDateString(dateString);=0A= if (dArray) {=0A= switch (dateFormat) {=0A= case "dmy" :=0A= d =3D parseInt(dArray[0], 10);=0A= m =3D parseInt(dArray[1], 10) - 1;=0A= y =3D parseInt(dArray[2], 10);=0A= break;=0A= case "ymd" :=0A= d =3D parseInt(dArray[2], 10);=0A= m =3D parseInt(dArray[1], 10) - 1;=0A= y =3D parseInt(dArray[0], 10);=0A= break;=0A= case "mdy" :=0A= default :=0A= d =3D parseInt(dArray[1], 10);=0A= m =3D parseInt(dArray[0], 10) - 1;=0A= y =3D parseInt(dArray[2], 10);=0A= break;=0A= }=0A= dateVal =3D new Date(y, m, d);=0A= } else if (dateString) {=0A= dateVal =3D new Date(dateString);=0A= } else {=0A= dateVal =3D new Date();=0A= }=0A= } catch(e) {=0A= dateVal =3D new Date();=0A= }=0A= =0A= return dateVal;=0A= }=0A= =0A= =0A= /**=0A= Try to split a date string into an array of elements, using common date = separators.=0A= If the date is split, an array is returned; otherwise, we just return = false.=0A= */=0A= function splitDateString(dateString)=0A= {=0A= var dArray;=0A= if (dateString.indexOf("/") >=3D 0)=0A= dArray =3D dateString.split("/");=0A= else if (dateString.indexOf(".") >=3D 0)=0A= dArray =3D dateString.split(".");=0A= else if (dateString.indexOf("-") >=3D 0)=0A= dArray =3D dateString.split("-");=0A= else if (dateString.indexOf("\\") >=3D 0)=0A= dArray =3D dateString.split("\\");=0A= else=0A= dArray =3D false;=0A= =0A= return dArray;=0A= }=0A= =0A= /**=0A= Update the field with the given dateFieldName with the dateString that = has been passed,=0A= and hide the datepicker. If no dateString is passed, just close the = datepicker without=0A= changing the field value.=0A= =0A= Also, if the page developer has defined a function called = datePickerClosed anywhere on=0A= the page or in an imported library, we will attempt to run that function = with the updated=0A= field as a parameter. This can be used for such things as date = validation, setting default=0A= values for related fields, etc. For example, you might have a function = like this to validate=0A= a start date field:=0A= =0A= function datePickerClosed(dateField)=0A= {=0A= var dateObj =3D getFieldDate(dateField.value);=0A= var today =3D new Date();=0A= today =3D new Date(today.getFullYear(), today.getMonth(), = today.getDate());=0A= =0A= if (dateField.name =3D=3D "StartDate") {=0A= if (dateObj < today) {=0A= // if the date is before today, alert the user and display the = datepicker again=0A= alert("Please enter a date that is today or later");=0A= dateField.value =3D "";=0A= document.getElementById(datePickerDivID).style.visibility =3D = "visible";=0A= adjustiFrame();=0A= } else {=0A= // if the date is okay, set the EndDate field to 7 days after the = StartDate=0A= dateObj.setTime(dateObj.getTime() + (7 * 24 * 60 * 60 * 1000));=0A= var endDateField =3D document.getElementsByName = ("EndDate").item(0);=0A= endDateField.value =3D getDateString(dateObj);=0A= }=0A= }=0A= }=0A= =0A= */=0A= function updateDateField(dateFieldName, dateString)=0A= {=0A= var targetDateField =3D document.getElementsByName = (dateFieldName).item(0);=0A= if (dateString)=0A= targetDateField.value =3D dateString;=0A= =0A= var pickerDiv =3D document.getElementById(datePickerDivID);=0A= pickerDiv.style.visibility =3D "hidden";=0A= pickerDiv.style.display =3D "none";=0A= =0A= adjustiFrame();=0A= targetDateField.focus();=0A= =0A= // after the datepicker has closed, optionally run a user-defined = function called=0A= // datePickerClosed, passing the field that was just updated as a = parameter=0A= // (note that this will only run if the user actually selected a date = from the datepicker)=0A= if ((dateString) && (typeof(datePickerClosed) =3D=3D "function"))=0A= datePickerClosed(targetDateField);=0A= }=0A= =0A= =0A= /**=0A= Use an "iFrame shim" to deal with problems where the datepicker shows up = behind=0A= selection list elements, if they're below the datepicker. The problem = and solution are=0A= described at:=0A= =0A= http://dotnetjunkies.com/WebLog/jking/archive/2003/07/21/488.aspx=0A= http://dotnetjunkies.com/WebLog/jking/archive/2003/10/30/2975.aspx=0A= */=0A= function adjustiFrame(pickerDiv, iFrameDiv)=0A= {=0A= // we know that Opera doesn't like something about this, so if we=0A= // think we're using Opera, don't even try=0A= var is_opera =3D (navigator.userAgent.toLowerCase().indexOf("opera") = !=3D -1);=0A= if (is_opera)=0A= return;=0A= =0A= // put a try/catch block around the whole thing, just in case=0A= try {=0A= if (!document.getElementById(iFrameDivID)) {=0A= // don't use innerHTML to update the body, because it can cause = global variables=0A= // that are currently pointing to objects on the page to have bad = references=0A= //document.body.innerHTML +=3D ""};b.prototype.t=3Dfunction(e,d){try{return = e.frames[d]}catch(f){return null}};b.prototype.i=3Dfunction(e){var = d=3Ddocument.createElement("iframe");for(var f in e)d.setAttribute(f,=0A= e[f]);return d};b.prototype.o=3Dfunction(e,d){var = f=3Dthis;setTimeout(function(){document.body.appendChild(f.i({id:e,name:e= ,src:d,width:0,height:0,frameBorder:0}))},0)};b.prototype.B=3Dfunction(e,= d){var = f=3Dthis;document.write(f.d({id:e,name:e,src:d,width:0,height:0,frameBord= er:0}))};b.prototype.k=3Dfunction(e,d){var = f=3D[],g=3De.length,k=3D0;while(k0){g.j[d]=3Di[o];for(var = r=3D0;rIDICommon.MAX_URL_LENGTH){A+=3D= "$";var = L=3Dl.h(d),W=3DIDICommon.MAX_URL_LENGTH-1-L.length,M=3DIDICommon.k(A,W),N= =3DM.length;for(var u=3D0;u<\/script>");else = if(b.google_ad_output=3D=3D"html"){if(b.name!=3D"google_ads_frame"){if(e!= =3Dnull)a.write('

');if(ca(b.google_ad_output,b.google_ad_client)){IDIHost.A("= http://pagead2.googlesyndication.com/pagead/idi_relay.html");var = d=3D0;if(b.google_num_0ad_slots)d+=3Db.google_num_0ad_slots;if(b.google_n= um_ad_slots)d+=3Db.google_num_ad_slots;if(b.google_num_sdo_slots)d+=3Db.g= oogle_num_sdo_slots;var f=3D"google_inline_div"+=0A= d,g=3D"

';a.write(g);var = k=3D"google_frame"+d,j=3Db.setTimeout(function(){IDIHost.l(k)},5000);IDIH= ost.q(c,k,b.google_ad_width,b.google_ad_height,{callback:function(l,i){aa= (l,i,j)},pollingInterval:500,iframeAttrs:{style:"position: = absolute;left:0px",marginWidth:"0",marginHeight:"0",vspace:"0",hspace:"0"= ,allowTransparency:"true"},=0A= parentDivId:f})}else{a.write('")}if(e!=3Dnull)a.write("

")}}= else if(b.google_ad_output=3D=3D"textlink")a.write('

Friday, March 21, 2008

News

Opinion

Features

Community

Other Sections

Spring Break 2008: Thinking Globally = and Acting=20 Locally