How to Build a Room Booking Calendar with dhtmlxScheduler

/*
This software is allowed to use under GPL or you need to obtain Commercial or Enterise License
to use it in not GPL project. Please contact sales@dhtmlx.com for details
*/
scheduler._props={};
scheduler.createUnitsView=function(a,f,j,g,k,l){if(typeof a=="object")j=a.list,f=a.property,g=a.size||0,k=a.step||1,l=a.skip_incorrect,a=a.name;scheduler._props[a]={map_to:f,options:j,step:k,position:0};if(g>scheduler._props[a].options.length)scheduler._props[a]._original_size=g,g=0;scheduler._props[a].size=g;scheduler._props[a].skip_incorrect=l||!1;scheduler.date[a+"_start"]=scheduler.date.day_start;scheduler.templates[a+"_date"]=function(a){return scheduler.templates.day_date(a)};scheduler.templates[a+
"_scale_date"]=function(c){var h=scheduler._props[a].options;if(!h.length)return"";var f=(scheduler._props[a].position||0)+Math.floor((scheduler._correct_shift(c.valueOf(),1)-scheduler._min_date.valueOf())/864E5);return h[f].css?"<span class='"+h[f].css+"'>"+h[f].label+"</span>":h[f].label};scheduler.date["add_"+a]=function(a,f){return scheduler.date.add(a,f,"day")};scheduler.date["get_"+a+"_end"]=function(c){return scheduler.date.add(c,scheduler._props[a].size||scheduler._props[a].options.length,
"day")};scheduler.attachEvent("onOptionsLoad",function(){for(var c=scheduler._props[a],f=c.order={},g=c.options,i=0;i<g.length;i++)f[g[i].key]=i;if(c._original_size&&c.size==0)c.size=c._original_size,delete c.original_size;c.size>g.length?(c._original_size=c.size,c.size=0):c.size=c._original_size||c.size;scheduler._date&&scheduler._mode==a&&scheduler.setCurrentView(scheduler._date,scheduler._mode)});scheduler.callEvent("onOptionsLoad",[])};
scheduler.scrollUnit=function(a){var f=scheduler._props[this._mode];if(f)f.position=Math.min(Math.max(0,f.position+a),f.options.length-f.size),this.update_view()};
(function(){var a=function(b){var d=scheduler._props[scheduler._mode];if(d&&d.order&&d.skip_incorrect){for(var a=[],e=0;e<b.length;e++)typeof d.order[b[e][d.map_to]]!="undefined"&&a.push(b[e]);b.splice(0,b.length);b.push.apply(b,a)}return b},f=scheduler._pre_render_events_table;scheduler._pre_render_events_table=function(b,d){b=a(b);return f.apply(this,[b,d])};var j=scheduler._pre_render_events_line;scheduler._pre_render_events_line=function(b,d){b=a(b);return j.apply(this,[b,d])};var g=function(b,
d){if(b&&typeof b.order[d[b.map_to]]=="undefined"){var a=scheduler,e=864E5,c=Math.floor((d.end_date-a._min_date)/e);d[b.map_to]=b.options[Math.min(c+b.position,b.options.length-1)].key;return!0}},k=scheduler._reset_scale,l=scheduler.is_visible_events;scheduler.is_visible_events=function(b){var d=l.apply(this,arguments);if(d){var a=scheduler._props[this._mode];if(a&&a.size){var e=a.order[b[a.map_to]];if(e<a.position||e>=a.size+a.position)return!1}}return d};scheduler._reset_scale=function(){var b=
scheduler._props[this._mode],a=k.apply(this,arguments);if(b){this._max_date=this.date.add(this._min_date,1,"day");for(var c=this._els.dhx_cal_data[0].childNodes,e=0;e<c.length;e++)c[e].className=c[e].className.replace("_now","");if(b.size&&b.size<b.options.length){var f=this._els.dhx_cal_header[0],g=document.createElement("DIV");if(b.position)g.className="dhx_cal_prev_button",g.style.cssText="left:1px;top:2px;position:absolute;",g.innerHTML="&nbsp;",f.firstChild.appendChild(g),g.onclick=function(){scheduler.scrollUnit(b.step*
-1)};if(b.position+b.size<b.options.length)g=document.createElement("DIV"),g.className="dhx_cal_next_button",g.style.cssText="left:auto; right:0px;top:2px;position:absolute;",g.innerHTML="&nbsp;",f.lastChild.appendChild(g),g.onclick=function(){scheduler.scrollUnit(b.step)}}}return a};var c=scheduler._get_event_sday;scheduler._get_event_sday=function(b){var a=scheduler._props[this._mode];return a?(g(a,b),a.order[b[a.map_to]]-a.position):c.call(this,b)};var h=scheduler.locate_holder_day;scheduler.locate_holder_day=
function(a,d,c){var e=scheduler._props[this._mode];return e?(g(e,c),e.order[c[e.map_to]]*1+(d?1:0)-e.position):h.apply(this,arguments)};var m=scheduler._mouse_coords;scheduler._mouse_coords=function(){var a=scheduler._props[this._mode],d=m.apply(this,arguments);if(a){if(!this._drag_event)this._drag_event={};var c=this._drag_event;if(this._drag_id&&this._drag_mode)c=this.getEvent(this._drag_id),this._drag_event._dhx_changed=!0;var e=Math.min(d.x+a.position,a.options.length-1);c[a.map_to]=a.options[e].key;
d.x=0;d.custom=!0}return d};var i=scheduler._time_order;scheduler._time_order=function(a){var d=scheduler._props[this._mode];d?a.sort(function(a,b){return d.order[a[d.map_to]]>d.order[b[d.map_to]]?1:-1}):i.apply(this,arguments)};scheduler.attachEvent("onEventAdded",function(a,d){if(this._loading)return!0;for(var c in scheduler._props){var e=scheduler._props[c];if(typeof d[e.map_to]=="undefined")d[e.map_to]=e.options[0].key}return!0});scheduler.attachEvent("onEventCreated",function(a,c){var f=scheduler._props[this._mode];
if(f){var e=this.getEvent(a);this._mouse_coords(c);g(f,e);this.event_updated(e)}return!0})})();