re-add 'start' option. extract start date from getBoundaryDatesFromDa…

…ta only if 'start' option is not defined.

jquery.ganttView.js

@@ -11,6 +11,7 @@ showWeekends: boolean
 data: object
 cellWidth: number
 cellHeight: number
+start: date
 slideWidth: number
 dataUrl: string
 behavior: {
@@ -63,12 +64,11 @@ behavior: {
  }
 
  function build() {
-
- var minDays = Math.floor((opts.slideWidth / opts.cellWidth) + 5);
- var startEnd = DateUtils.getBoundaryDatesFromData(opts.data, minDays);
- opts.start = startEnd[0];
- opts.end = startEnd[1];
-
+ var minDays = Math.floor((opts.slideWidth / opts.cellWidth) + 5);
+ var startEnd = DateUtils.getBoundaryDatesFromData(opts.data, minDays);
+ if (!opts.start) {opts.start = startEnd[0];}
+ opts.end = startEnd[1];
+
  els.each(function () {
 
  var container = jQuery(this);
@@ -223,8 +223,12 @@ behavior: {
  for (var j = 0; j < data[i].series.length; j++) {
  var series = data[i].series[j];
  var size = DateUtils.daysBetween(series.start, series.end) + 1;
- var offset = DateUtils.daysBetween(start, series.start);
- var block = jQuery("<div>", {
+ if (series.start >= start ) {
+ var offset = DateUtils.daysBetween(start, series.start); 
+ } else {
+ var offset = -(DateUtils.daysBetween(series.start, start));
+ } 
+ var block = jQuery("<div>", {
  "class": "ganttview-block",
  "title": series.name + ", " + size + " days",
  "css": {
@@ -382,4 +386,4 @@ behavior: {
  }
  };
 
-})(jQuery);
+})(jQuery);