A JavaScript Weekly Calendar

Massimo Beatini

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14 Feb 2006CPOL1 min read

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This calendar can be used as a date picker or to select a weekly day range in the selected month.

Download source files - 186 Kb

Introduction

The calendar generated by this script can be used as a date picker or to select a weekly day range in the selected month. This script has been tested only with Internet Explorer 6.0, Firefox 1.0.7, and Opera 8.51 on a Windows 2003 Server.

Usage

Using this calendar, you can select the start week day, the default is Monday. The calendar's layout is customizable by CSS. To use it, you must insert the following HTML code in the head section of your page:

HTML

// insert this code in the head section
// use this css to modify the calendar layout
<LINK REL=StyleSheet HREF="calendar.css" TYPE="text/css">
// include the calendar javascript
<SCRIPT LANGUAGE="JavaScript" 
         SRC="weeklycalendar.js"></SCRIPT>
<script language="javascript">
    // call the function to build the calendar
    // function's param specify the first day of week 
    // 0=Sunday, 1 = Monday, ..., 6=Saturday
    buildWeeklyCalendar(1);
</script>

If the first day of the week is Monday, the column week contains the week number, otherwise it shows the "<" symbol.

The calendar is dynamically added to the HTML page and it is contained in a div element. To display the calendar, it is necessary to call the w_displayCalendar function. This function accepts two input parameters; they must be the existing element IDs used by the script to return values.

JavaScript

//
// display calendar
//
function w_displayCalendar(linkedId1, linkedId2) 
{
    w_linkedInputText_1 = linkedId1;
    w_linkedInputText_2 = linkedId2;
    
    w_renderCalendar(0);
    if(navigator.userAgent.indexOf("MSIE") != -1) 
    {
        weeklyCalendar.style.left=
          window.event.x+document.body.scrollLeft;
        weeklyCalendar.style.top=
          window.event.y+document.body.scrollTop;
    } 
    else if ((navigator.appName.indexOf("Netscape") != -1) || 
             (navigator.appName.indexOf("Opera") != -1))
    {
        document.getElementById('weeklyCalendar').style.left=gx + 5;
        document.getElementById('weeklyCalendar').style.top=gy + 5;
    }
    document.getElementById('weeklyCalendar').style.visibility = "visible";
}

Using the calendar as a date picker, it automatically fills an input text element passing its ID as a parameter of the w_displayCalendar function.

HTML

<tr>
   <td style="height: 78px">Date picker</td><td style="height: 78px">
      <!--  this is the datepicker input text -->    
      <input type="text"  name="DatePicker" id="DatePicker" size="35" maxlength="80">
      <!--  attach the w_displayCalendar function to the onClick event -->
      <input type="button" value="..." 
         onClick="w_displayCalendar('DatePicker',null);">
   </td>
</tr>

Using the calendar as a weekly range selector, clicking on the week number or the < symbol, it automatically fills the two input text.

HTML

<tr>
    <td style="height: 131px">Weekly Range Selector</td>
      <!--  this is start range input text -->    
      <td style="height: 131px">Start day:<input type="text" 
         name="WeeklyDateStart" id="WeeklyDateStart" 
         size="35" maxlength="80"><br />
      <!--  this is end range input text -->
      End day: <input type="text"  name="WeeklyDateEnd" 
         id="WeeklyDateEnd" size="35" maxlength="80">
      <!--  attach the w_displayCalendar function to the onClick event -->
      <input type="button" value="..." 
        onClick="w_displayCalendar('WeeklyDateStart','WeeklyDateEnd');">
   </td>
</tr>

New Feature

Now you can use the calendar as a simple date picker using the new function w_displayDatePicker. This function shows the calendar and automatically hides the column week using a new CSS class.

HTML

<tr>
   <td style="height: 78px">Date picker</td>
   <td style="height: 78px">
      <!--  this is the datepicker input text -->
      <input type="text"  name="DatePicker" 
             id="DatePicker" size="35" maxlength="80">
      <!--  attach the w_displayCalendar function to the onClick event -->
      <input type="button" value="..."
         onClick="w_displayDatePicker('DatePicker');">
   </td>
</tr>