source: timingandestimationplugin/branches/trac0.11/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= {};
   var statusfields = [];
   function dateToUnixEpoch(date){
      return Math.round(date.getTime()/1000) - (60 * date.getTimezoneOffset());
   }
   function makeDate(val) {
      var d = null;
      if (val && val.length && val.length>0){
     try{
        d = Date.parse(val);
     }
     catch(e){
        d = invalidDate;
     }
     if(!d || d.toString == invalidDate){
        alert("You entered an invalid date: "+val);
        return null;
     }
      }
      return d;
   }
   function addBillingField( name /*optional type defaults to "textbox", optional flag status*/ ){
      var type = arguments.length >= 1 ? arguments[1] : "textbox";
      var status = arguments.length >= 2 ? arguments[2] : false;
      var getSet =
     (function(){
        var valueProp = "value";

        if(type == "date"){
           return function (/*optional value*/){
          if(arguments.length == 0){
             var d = makeDate(this.$()[valueProp]);
             if (d) return dateToUnixEpoch(d);
             else return null;
          }
          else{
             var val = makeDate(arguments[0]);
             if(!val){
            this.$()[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
      };
      if (status){
     statusfields.push({
          name:name,
          "$" : function(){
          return document.getElementById(name);
          },
          getval : getSet,
          setval : getSet
     });
      }
   }

   addBillingField("billable", "checkbox");
   addBillingField("unbillable", "checkbox");
   addBillingField("startdate", "date");
   addBillingField("startbilling", "dateselect");
   addBillingField("enddate", "date");
   addBillingField("endbilling", "dateselect");


   var linkify = 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");

      for(var i=0, f = null ; f = statusfields[i] ; i++){
     val = f.name.toUpperCase().replace("_","", "g").replace(" ","","g")+"=";
     if(f.getval()){
        val += f.name
     }
     addToQuery(val);
      }

      //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;
   }
//})()