source: timingandestimationplugin/branches/trac0.10/timingandestimationplugin/htdocs/linkifyer.js

var linkify = 
(function(){
   String.prototype.trim = 
      (function () {return this.replace(/^\s+/, "").replace(/\s+$/, "");});
   var invalidDate = new Date("invalid").toString()
   var billingfields= {}
   function dateToUnixEpoch(date){
      return Math.round(date.getTime()/1000) - (60 * date.getTimezoneOffset());
   }
   function addBillingField( name /*optional type defaults to "textbox"*/ ){
      var type = arguments.length > 1 ? arguments[1] : "textbox";
      var getSet = 
     (function(){
        var valueProp = "value";
        
        if(type == "date"){
           return function (/*optional value*/){
          if(arguments.length == 0){
             var d = new Date(this.$()[valueProp]);
             if(d.toString == invalidDate){
            alert("You entered an invalid "+name);
            return null;
             }
             return dateToUnixEpoch(d);
          }
          else{
             var val = new Date(arguments[0]);
             if(val.toString == invalidDate){
            this.$()[valueProp] = null;
            return null;
             }
             this.$()[valueProp] = val;
             return val;
          }
           }
        }
        //FOR EVERYTHING ELSE
        if(type == "checkbox"){
           valueProp = "checked";
        }
        return function (/*optional value*/){
           //alert(name+" : "+type+" "+valueProp);
           if(arguments.length == 0){
          var val = (this.$())[valueProp];
          
          if(typeof(val) == "string") val = val.trim();
          if(val)return val;
          return null;
           }
           else{
          var val = arguments[0];
          (this.$())[valueProp] = val;
          return val
           }
        }
     })()
      billingfields[name] = {
     "$" : function(){
        return document.getElementById(name);
     },
         getval : getSet,
     setval : getSet
      };
   }

   addBillingField("billable", "checkbox");
   addBillingField("unbillable", "checkbox");
   addBillingField("new", "checkbox");
   addBillingField("assigned", "checkbox");
   addBillingField("reopened", "checkbox");
   addBillingField("closed", "checkbox");
   addBillingField("startdate", "date");
   addBillingField("startbilling", "dateselect");
   addBillingField("enddate", "date");
   addBillingField("endbilling", "dateselect");
   

   return function ( atag, basehref ){
      var query = "";
      var haveAdded = false;
      function addToQuery(str){
     query += haveAdded ? "&" : "?";
     query += str;
     haveAdded = true;
      }
      //billable logic
      addToQuery(billingfields["billable"].getval() || !(billingfields["unbillable"].getval())
         ? "BILLABLE=1" : "BILLABLE=0");
      addToQuery(billingfields["unbillable"].getval() || !(billingfields["billable"].getval())
         ? "UNBILLABLE=0" : "UNBILLABLE=1");

      addToQuery(billingfields["new"].getval() ? "NEW=new" : "NEW=");
      addToQuery(billingfields["assigned"].getval() ? "ASSIGNED=assigned" : "ASSIGNED=");
      addToQuery(billingfields["reopened"].getval() ? "REOPENED=reopened" : "REOPENED=");
      addToQuery(billingfields["closed"].getval() ? "CLOSED=closed" : "CLOSED=");

      //startdate the date in the text box or the date in the dropdown or the first time
      startdate = billingfields["startdate"].getval() || billingfields["startbilling"].getval() || 0;
      addToQuery("STARTDATE="+startdate);
      //the date in the enddate text box or the date in the enddate billing box or real close to the end of integer unix epoch time
      // this will need a patch to continue working  past this point
      enddate = billingfields["enddate"].getval() || billingfields["endbilling"].getval() || 2000000000;
      addToQuery("ENDDATE="+enddate);

      atag.href = basehref+query;
   }
})()