JavaScript Snippets

1. Write A Cookie
2. Switch Source of Window
3. Difference between two dates
4. Conditional Operator
5. Form Select Box Values
6. Child Windows
7. Random Number
8. Switch Statement

1. Write A Cookie
   
   

   function writeCookie(name, value) { 
      // Write out cookie of with 90 expiry date
      
      var expdate = new Date()
      expdate.setTime (expdate.getTime() + 90*(24 * 60 * 60 * 1000)) 
      document.cookie = name+"="+value+";expires=" + expdate.toUTCString();
   }
   

2. Switch Source of window
   
   

      window.location.replace('newFile.asp');
   

3. Difference between two dates
   
   

   
      startYear = "2001"
      startMonth = "1"��� //---> ==FEBRUARY
      startDay = "1"����� //---> == 1
      endYear = "2002"
      endMonth = "2"���   //---> ==MARCH
      endDay = "26"�����  //---> == 1
   
      var startDate = new Date (startYear,startMonth,startDay)
      var endDate = new Date (endYear,endMonth,endDay)
   
      var startms = startDate.getTime();
      var endms = endDate.getTime();
   
      var difference = endms - startms;
      var daysdifference = difference/1000/60/60/24;
   
   

4. Conditional Operator
   
   

      x = (expression) ? value1 : value2 
      
      x = value1 if expression true 
      x = value2 if expression false 
   

5. Form Select Box Values
   
   <SCRIPT> function sbmt(aform) { alert (aform.sel.options[aform.sel.selectedIndex].value ) return true; } </SCRIPT> <form name="frm" action="http://www.geocities.com/paulrowland2000/Dev/xx.asp" onSubmit="return sbmt(this)"> <select name="sel"> <option value="11111">111111111111 <option value="22222">2222222222222 <option value="33333">333333333333 <option value="44444">4444444444 </select> <input type=submit value=submit id=submit1 name=submit1> </form>
6. Child Windows
   
   

   in the main window
       var bReload = true;
       xxx = window.open('aURL','aName')
       window.xxx.hello
        
   in the window thats opened
       alert(this.opener.bReload)
       function hello () {
        alert ('hello')
       }
   

7. Random Number
   
   

   
    If you need random floating-point numbers
    in the range from A to B, use this code: 
   
    num is random, from A to B 
   
    num = A + (B-A)*Math.random()  
   
   

8. Switch Statement
   
   

   switch sVarName {
   	case "selUniversityId":
           frmApprovedCourses.sCourse.value = '';
   		break;
   	case "selCourseId":
           frmApprovedCourses.sCourse.value = 'x';
   		break;
       default:
           break;   			
   	}
   

9.