Contenu TH centré par rapport partie visible de sa colonne spannée

Bonjour,

Très bien voici :
Tu verras ce que j'ai tenté de faire en JS dans app.js avec les lignes 47 à 63 (en commentaire).
Pas jouable avec les padding right et left

index.html :

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<!DOCTYPE html>
<html lang="fr">
  <head>
    <title>Bootstrap template</title>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
	<link href="css/styles.css" rel="stylesheet">
 
    <!-- HTML5 Shim and Respond.js IE8 support of HTML5 elements and media queries -->
    <!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
    <!--[if lt IE 9]>
      <script src="https://oss.maxcdn.com/html5shiv/3.7.2/html5shiv.min.js"></script>
      <script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
    <![endif]-->
  </head>
  <body>
	<div class="container"> 
		<div class="ui-planning"></div>
	</div>
    <script src="https://code.jquery.com/jquery-3.2.1.js" integrity="sha256-DZAnKJ/6XZ9si04Hgrsxu/8s717jcIzLy3oi35EouyE=" crossorigin="anonymous"></script>
	<script src="https://code.jquery.com/ui/1.12.0/jquery-ui.js" integrity="sha256-0YPKAwZP7Mp3ALMRVB2i8GXeEndvCq3eSl/WsAl1Ryk=" crossorigin="anonymous"></script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
	<script src="js/llls.js"></script>
	<script src="js/datemgr.js"></script>
	<script src="js/app.js"></script>
  </body>
</html>

css/styles.css :

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p {
    margin: 0;
}
.ui-planning .content{
	margin:5px;	
	border: 1px solid #111;
	overflow:auto;
}
.ui-planning{
	border: black 3px solid;
	margin: 10px;
}
.ui-planning table{
	width:100%;
}
.ui-planning table, .ui-planning  thead th{
	border-left: 1px solid #ccc;
	border-top: 1px solid #ccc;
	border-bottom: 1px solid #ccc;
	padding:5px;
	text-align:center;
	word-wrap: break-word;
}
.ui-planning table tr th[colspan="1440"]{
	border-bottom: 1px solid #ccc;
	border-top:2px solid  white;
}

js/llls.js :

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/*$Revision:   3.0  $*/
try {
	if(!Object.prototype.__defineGetter__ &&
	Object.defineProperty({}, "x", { get: function() { return true } }).x) {
		Object.defineProperty(Object.prototype, "__defineGetter__",
	 { enumerable: false, configurable: true,
		value: function(name, func) {
			Object.defineProperty(this, name,
			 { get: func, enumerable: true, configurable: true });
		} 
	 });
		Object.defineProperty(Object.prototype, "__defineSetter__",
	 { enumerable: false, configurable: true,
		value: function(name, func) {
			Object.defineProperty(this, name,
			 { set: func, enumerable: true, configurable: true });
		} 
	 });
	}
} catch(defPropException) { /*Do nothing if an exception occurs*/ };
 
 
window.Num=window.Num ||
    function (value){
		var value_=value || 0;
 
		if (!isNaN(value_))return Number(value_);
 
		var retVal= Globalize.parseFloat(value_.toString(), 10, Globalize.culture().name);
		return (isNaN(retVal)?0:retVal);
	};
 
window.className=window.className || 
	function  (obj){
		if (!obj)return '';
		var toClass = {}.toString 
		return toClass.call(obj).replace('[','').replace(']','').split(" ")[1].toUpperCase();
	}
 
addEventListener=addEventListener || 
	function (eventName,callBackProc){
		if (addEventListener)addEventListener(eventName, callBackProc, true);
		else if (attachEvent)attachEvent('on'+eventName, callBackProc);
	}
 
window.VarIsDef=window.VarIsDef || function VarIsDef(Var) {return (typeof Var!=undefined && Var!=null);} 
 
Array.prototype.objIndexOf = Array.prototype.objIndexOf || 
	function(propertyToSearch,propertyValueToSearch) {
		for (var i=0;i<this.length;i++) {
		  if (this[i].hasOwnProperty(propertyToSearch) && this[i][propertyToSearch]==propertyValueToSearch) return i;
		}
		return -1;
	}
 
window.execFunction=window.execFunction ||
	function execFunction(FunctionName_){
		if (!VarIsDef(FunctionName_))return;
		var i=function_exists(FunctionName_);
		if(typeof i=="function")i.call();
		FunctionName_='';
	}
 
window.function_exists=window.function_exists ||
	function(e){
        if(typeof e=="string"&&typeof window[e]=="function")return window[e];
        if(typeof e=="function")return e;
        return false
    }
 
Math.sign = Math.sign || 
	function(x) {
		x = +x; // on convertit le paramètre en nombre
		if (x === 0 || isNaN(x))return 0;
		return x > 0 ? 1 : -1;
	}
 
Math.floorAt=Math.floorAt || 
	function (value,prec,decimalSign){
		var _prec=prec || 0;
		var _value=0;
		try {_value=eval(value);}catch(exception) {_value=0;};
 
		var _decimalSign=decimalSign || '.';
 
		_prec=(isNaN(_prec))?0:Number(_prec);
		_value=((isNaN(_value))?0:_value).toString();
		_decimalSign=(typeof _decimalSign!='string')?'.':(_decimalSign.length!=1)?'.':(".,".indexOf(_decimalSign)<0)?'.':_decimalSign;
		var _dsp=_value.indexOf(".");
		var _iPart=(_dsp<0)?_value:_value.substr(0,_dsp);
		var _dPart=((_dsp<0)?'':_value.substr(_dsp+1))+"0".repeat(_prec);
 
		return _iPart+((_prec!=0)?_decimalSign+_dPart.slice(0,_prec):'');
	}
 
window.trim=window.trim || 
    function(e,t){
        type=typeof e;
        if(type!=="string"&&type!=="number")return false;
        var n,r=0,i=0;e+="";
        if(!t){n=" \n\r	\fÂ*       ?????\u2028\u2029 "}
        else{t+="";n=t.replace(/([\[\]\(\)\.\?\/\*\{\}\+\$\^\:])/g,"$1")}
        r=e.length;
        for(i=0;i<r;i++){if(n.indexOf(e.charAt(i))===-1){e=e.substring(i);break}}
        r=e.length;
        for(i=r-1;i>=0;i--){if(n.indexOf(e.charAt(i))===-1){e=e.substring(0,i+1);break}}
        return n.indexOf(e.charAt(0))===-1?e:""
    }
 
String.prototype.repeat=String.prototype.repeat ||
	function (){
		var _times=arguments[0] || 0;
		var _retval='';
		if (isNaN(_times))return '';
		_times=parseInt(_times);
		for (var _t=0 ; _t<_times ; _t++)_retval+=this.toString();
		return _retval;
	}
 
window.is_jqueryOk=window.is_jqueryOk ||
	function(e){
        if(e===null)return false;
        type=typeof e;
        if(type=="string"&&e.length>0){
            e=$(e);
            if(e===null)return false;
            if(e.length==0)return false;
            type=typeof e
         }
         if(type!="object")return false;
         return e
    }
 
window.doEvent=window.doEvent ||
	function (obj,eventName){
		var jqObj=$(obj);
		var jsObj=jqObj[0] || obj;
		var _eventName=(eventName || '')+'';
 
		if (!jsObj && !jqObj)return;
		if (typeof _eventName!='string')return;
		if (_eventName.length==0)return;
 
		var disabled=jsObj.disabled
		var evt=document.createEvent("Event");
		evt.initEvent(_eventName,false,true);
 
		jsObj.disabled=false;
		jsObj.dispatchEvent(evt);
		jsObj.disabled=disabled;
	}	
 
window.valueIsIn=window.valueIsIn || 
	function (value){
		if (Array.isArray(this))return ($.inArray(value,this)!=-1);
		for (var prop in this){
			if (this[prop]==value)return true;
		}
		return false;
	}
 
window.getXPath=window.getXPath || 
	function (domObject){
		if (!VarIsDef(domObject))return '';
 
		var result='';
		var ps=$(domObject).parents();
		for (var pid=0;pid<ps.length;pid++) {
			var p=ps[pid];
			if (VarIsDef(p.nodeName)){
				var r=p.nodeName;
				if (p.nodeName.toLowerCase()=='div'){
					if (p.id.length!=0)r+='#'+p.id;
					if (VarIsDef($(p).attr('class'))) if ($(p).attr('class').length!=0)r+='.'+$(p).attr('class').trim().replace(/  /g,' ').replace(/ /g,'.');
				}
				result=r+' '+result;
			}
		};
		return result;
	}
 
window.isInArray=window.isInArray || 
	function (value,objX){
		if (typeof objX!='object')return false;
		if (VarIsDef(objX.length))return ($.inArray(value,objX)!=-1);
		for (var prop in objX){
			if (objX[prop]==value)return true;
		}
		return false;
	};
 
window.SortList=window.SortList || 
  	function (listname) { 
        var r=new Array();
        var o=new Object();
        if (typeof(listname)=='object')o=listname.options;
        else o=$(listname + " option"); 
        for (var iloop=0 ; iloop<o.length ; iloop++)r.push(o[iloop]);
        r.sort(function(a, b){return (a.text < b.text) ? -1 : (a.text > b.text) ? 1 : 0;}); 
        $(r).remove(); 
        $(listname).append($(r)); 
    }
 
window.isValidAngle=window.isValidAngle ||
	function (angle){
		if (isNaN(angle))return false;
		if (parseFloat(angle)!=parseInt(angle))return false;
		var _angle=parseInt(angle);
		return (_angle>=0 && _angle<=359);
	}
 
window.isValidColor=window.isValidColor || 
	function (color){
		if (isNaN(parseInt(color,16)))return false;
		var _color=parseInt(color,16);
		return (_color>=0 && _color<=parseInt('FFFFFF',16));
	}
 
window.grpDom=window.grpDom ||
	function (ids,defaultAll){
		var grp=new Array();
		if (!VarIsDef(ids))return grp;
 
		if (Array.isArray(ids))grp=ids;
		else if (typeof(ids)=='object')grp.push(ids);
		else if(typeof(ids)=='string'){
			if (ids='*')grp=$(defaultAll);
			else return grp=$(ids);
		}
 
		for (var iloop=0 ; iloop<grp.length ; iloop++){
			var e='';
			if (typeof(grp[iloop])=='string')grp[iloop]=$(grp[iloop]);
			if (VarIsDef(grp[iloop].id))e=grp[iloop].id;
			if (typeof(e)!='string')grp.splice(ilopp,1);
			else if (e.length==0)grp.splice(iloop,1);
				else {
					e=$("#"+e);
					if (e.length==0)grp.splice(iloop,1);
					else grp[iloop]=e[0];
				}
		}
		return grp;
	}
 
window.DOMParser=window.DOMParser || 
	function StringtoXML(text){
		 if (window.ActiveXObject){
			 var doc=new ActiveXObject('Microsoft.XMLDOM');
			 doc.async='false';
			 doc.loadXML(text);
		 } else {
			 var parser=new DOMParser();
			 var doc=parser.parseFromString(text,'text/xml');
		 }
		 return doc;
	 } 
 
window.clipboardGetData=function (fmt){
	var defaultFmt='text';
	var fmt_=fmt || defaultFmt;
	fmt_+='';
	if (typeof fmt_!='string')fmt_=defaultFmt;
	if (window.clipboardData)return window.clipboardData.getData(fmt_);
	return window.event.clipboardData.getData('text');
}

js/app.js :

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function displayPlan(fromDate , toDate){
    var divUiPlanning=document.getElementsByClassName('ui-planning');
    if (!divUiPlanning.length){return;}
    divUiPlanning=divUiPlanning[0];
 
    var jours = new Array("dimanche", "lundi", "mardi", "mercredi", "jeudi", "vendredi", "samedi");
    var mois = new Array("janvier", "février", "mars", "avril", "mai", "juin", "juillet", "aôut", "septembre", "octobre", "novembre", "décembre");
 
    var divContent=divUiPlanning.appendChild(document.createElement('div'));
    divContent.setAttribute('class',"content")
 
    var table=divContent.appendChild(document.createElement('table'));
    var table_header=table.appendChild(document.createElement('thead'));
    var table_body=table.appendChild(document.createElement('tbody'));  
    var table_trDates=table_header.appendChild(document.createElement('tr')); 
    var table_trHours=table_header.appendChild(document.createElement('tr'));
    var table_trMinutes=table_header.appendChild(document.createElement('tr'));
 
    var fromDate=new Date(fromDate) || new Date();
    var toDate=new Date(toDate) || new Date();
    var nbDays=fromDate.interval(toDate).days;
 
    for (var iDays=0 ; iDays<nbDays ; iDays++){
        var colSpan=[0,0,0];
        for (iHours=0 ; iHours<24 ; iHours++){
            colSpan[0]=0;
            for (iMinutes=0 ; iMinutes<60 ; iMinutes+=5){
                var thMinutes=document.createElement('th');
                thMinutes.innerText=('0'+iMinutes).slice(-2);
                table_trMinutes.appendChild(thMinutes);       
                colSpan[0]++; 
            }
            var thHours=document.createElement('th');
            thHours.innerText=('0'+iHours).slice(-2)+"h";
            thHours.colSpan=colSpan[0];
            table_trHours.appendChild(thHours);
            colSpan[1]++;
        }
        var d=new Date(fromDate.setDate(fromDate.getDate()-fromDate.getDay()+1+iDays));
        var thDates=document.createElement('th');            
 
        thDates.innerText=d.daysNames()+" "+("0"+d.getDate()).slice(-2)+"/"+("0"+(d.getMonth()+1)).slice(-2)+"/"+d.getFullYear();           
 
        table_trDates.appendChild(thDates);      
        thDates.colSpan=colSpan[0]*colSpan[1];             
    }
 /*
    var allWith=table_trDates.parentElement.clientWidth;
    for (var iLoop=0 ; iLoop<table_trDates.children.length ; iLoop++){
        table_trDates.children[iLoop].style.paddingRight=(allWith/table_trDates.children.length)+"px";
        table_trDates.children[iLoop].style.paddingLeft="550px";
    }
 
    allWith=table_trDates.parentElement.clientWidth;
    divContent.onscroll=function(evt){
        console.log(this.scrollLeft);
        var oneWidth=allWith/table_trDates.children.length; //this.children[0].children[0].clientWidth
        var x=allWith/oneWidth-table_trDates.children.length; 
        table_trDates.children[x].style.paddingLeft=(550+this.scrollLeft-(oneWidth*x))+"px";
        evt.preventDefault();
        evt.stopPropagation();
    }
*/
}
 
$(document).ready(function (){
    var today=new Date();
    var fromDate=today.setDate(today.getDate()-today.getDay()+1);
    displayPlan("12/04/2017","12/16/2017");
});

js/datemgr.js :

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"use strict"
var daysNames=[];
var monthsNames=[];
 
monthsNames["en"]=["january","february","march","april","may","june","july","august","september","october","november","december"];
monthsNames["en-GB"]=monthsNames["en"];
monthsNames["fr"]=["janvier","février","mars","avril","mai","juin","juillet","août","septembre","octobre","novembre","décembre"];
monthsNames["fr-FR"]=monthsNames["fr"];
 
daysNames["en"]=["sunday","monday","tuesday","wednesday","thursday","friday","saturday"];
daysNames["en-GB"]=daysNames["en"];
daysNames["fr"]=["dimanche","lundi","mardi","mercredi","jeudi","vendredi","samedi"];
daysNames["fr-FR"]=daysNames["fr"];
 
function dateMgr(){
	this.init();
}
dateMgr.prototype={	
	fmt: function fmt(){return ["Weeks","Days","Hours","Minutes","Seconds","Milliseconds"]},
	daysNames:function daysNames(d){
		var _name=window.daysNames[this.lang];
		var _d=(!VarIsDef(d))?this:d;	
 
		return _name[(className(_d)==='DATE')?_d.getDay():(className(_d)==='NUMBER')?_d:(isNaN(_d))?-1:parseFloat(_d)] || _name;
	},
	monthsNames:function monthsNames(d){
		var _name=window.monthsNames[this.langUse] || window.monthsNames['en'];
		var _d=(!VarIsDef(d))?this:d;		
 
		return _name[(className(_d)==='DATE')?_d.getMonth():(className(_d)==='NUMBER')?_d:(isNaN(_d))?-1:parseFloat(_d)] || _name;
	},
	add:function add(d)	{
 
	},
	holidays:function holidays(d){
		var _holyday=function(y,m,d,label){return {date:new Date(y,m,d),label:label};}
		var _d=d || this;
		var Y=(className(_d)==='DATE')?_d.getFullYear():(className(_d)==='NUMBER')?_d:(isNaN(_d))?0:parseFloat(_d);
		var easter=new Date().easter(d)
		return [
				new _holyday(Y,"00","01","jour de l'an"),	
				new _holyday(Y,"04","01","jour du travail"),
				new _holyday(Y,"04","08","armistice 1945"),
				new _holyday(Y,"06","14","fête nationale"),
				new _holyday(Y,"07","15","assomption"),
				new _holyday(Y,"10","01","toussaint"),
				new _holyday(Y,"10","11","armistice 1914"),
				new _holyday(Y,"11","25","noël"),
				new _holyday(Y, easter.getMonth(), easter.getDate()+1,"paques"),
				new _holyday(Y, easter.getMonth(), easter.getDate()+39,"ascencion"),
				new _holyday(Y, easter.getMonth(), easter.getDate()+50,"pentecôte")
			   ].sort(function(a,b){
				return a.date.getTime()-b.date.getTime();
				})
	},
	isHoliday:function isHoliday(d){
		var _d=d || this;
		if(className(_d)!=='DATE')return false;
		var is=false;
		var iLoop=0;
		var _holidays=this.holidays(_d)
		while (!is && iLoop<_holidays.length){
			is=(_holidays[iLoop].date.toString()===_d.toString());
			iLoop+=+(!is);
		}
		return is;
	},
	easter:function easter(d){
		var _d=d || this;
		var Y=(className(_d)==='DATE')?_d.getFullYear():(className(_d)==='NUMBER')?_d:(isNaN(_d))?0:parseFloat(_d);
		if (Y==0)return Y;
 
		var G = Y%19;
		var C = Math.floor(Y/100);
		var H = (C - Math.floor(C/4) - Math.floor((8*C+13)/25) + 19*G + 15)%30;
		var I = H - Math.floor(H/28)*(1 - Math.floor(H/28)*Math.floor(29/(H + 1))*Math.floor((21 - G)/11));
		var J = (Y*1 + Math.floor(Y/4) + I + 2 - C + Math.floor(C/4))%7;
		var L = I - J;
		var easterMonth = 3 + Math.floor((L + 40)/44);
		var easterDay = L + 28 - 31*Math.floor(easterMonth/4);
		return new Date(Y, easterMonth-1, easterDay);
	},
	quantum:function quantum(d){
		var _d=d || this;
		var retVal=0;
		if (className(_d)!='DATE')return retVal;
		var y=_d.getFullYear(),m=_d.getMonth();
		for (var iLoop=0 ; iLoop<m ; iLoop++)retVal+=this.monthSize(new Date(y,iLoop));
		return retVal+_d.getDate();
	},
	isLeapYear:function isLeapYear(d){
		var _d=d || this;
		var y=(className(_d)==='DATE')?_d.getFullYear():(className(_d)==='NUMBER')?_d:(isNaN(_d))?0:parseFloat(_d);
		if (y!=0)return (new Date(y,1,29).getDate()==29);
		return false;
	},
	monthSize:function monthSize(d) {
		var _d=d || this;
		if (className(_d)==='DATE')return new Date(new Date(_d.getFullYear(),_d.getMonth()+1).getTime()-(1000*3600*24)).getDate();
		return 0;
	},
	yearSize:function yearSize(d){
		var _d=d || this;
		var y=(className(_d)==='DATE')?_d.getFullYear():(className(_d)==='NUMBER')?_d:(isNaN(_d))?0:parseFloat(_d);
		if (y!=0)return ((new Date().isLeapYear(y))?366:365);
		return 0;
	},
	interval:function interval(dS,dE,fmt){
		var diff = {millisecondes:0,seconds:0,minutes:0,hours:0,days:0,weeks:0};                           // Initialisation du retour
		if (arguments.length==0)return diff;
		if (arguments.length==1){
			dE=dS;
			dS=this; 
		}
		var _dE=Date.UTC(dE.getFullYear(),dE.getMonth(),dE.getDate(),dE.getHours(),dE.getMinutes(),dE.getSeconds(),dE.getMilliseconds());
		var _dS=Date.UTC(dS.getFullYear(),dS.getMonth(),dS.getDate(),dS.getHours(),dS.getMinutes(),dS.getSeconds(),dS.getMilliseconds());
		var delay=Math.abs(_dE-_dS);
 
 
		diff.days=Math.floor(delay/(24*3600*1000));
		delay=delay % (24*3600*1000);
 
		diff.weeks=Math.floor(diff.days/7);
 
		diff.hours=Math.floor(delay/(3600*1000));
		delay=delay % (3600*1000);
 
		diff.minutes=Math.floor(delay/(60*1000));
		delay=delay % (60*1000);
 
		diff.seconds=Math.floor(delay/1000);
		delay=delay % 1000;
 
		diff.millisecondes=delay;
		return diff;
	},
	getYearDay:function getYearDay() { //1 - 366
		var year  = this.getFullYear();
		var month = this.getMonth();
		var day   = this.getDate();
 
		var offset = [0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334];
 
		//l'année bissextile n'est utile qu'à partir de mars
		var bissextile = (month < 2) ? 0 : (year % 400 == 0 || (year % 4 == 0 && year % 100 != 0));
 
		return parseInt(day + offset[month] + bissextile);
	},
	getMonday:function getMonday() {
		var offset = (this.getDay() + 6) % 7;
		return new Date(this.getFullYear(), this.getMonth(), this.getDate()-offset);
	},
	getWeek:function getWeek() { //1 - 53
		var year = this.getFullYear();
		var week;
 
		//dernier lundi de l'année
		var lastMonday = new Date(year, 11, 31).getMonday();
 
		//la date est dans la dernière semaine de l'année
		//mais cette semaine fait partie de l'année suivante
		if(this >= lastMonday && lastMonday.getDate() > 28) {
			week = 1;
		}
		else {
			//premier lundi de l'année
			var firstMonday = new Date(year, 0, 1).getMonday();
 
			//correction si nécessaire (le lundi se situe l'année précédente)
			if(firstMonday.getFullYear() < year) firstMonday = new Date(year, 0, 8).getMonday();
 
			//nombre de jours écoulés depuis le premier lundi
			var days = this.getYearDay() - firstMonday.getYearDay();
 
			//window.alert(days);
 
			//si le nombre de jours est négatif on va chercher
			//la dernière semaine de l'année précédente (52 ou 53)
			if(days < 0) {
				week = new Date(year, this.getMonth(), this.getDate()+days).getWeek();
			}
			else {
				//numéro de la semaine
				week = 1 + parseInt(days / 7);
 
				//on ajoute une semaine si la première semaine
				//de l'année ne fait pas partie de l'année précédente
				week += (new Date(year-1, 11, 31).getMonday().getDate() > 28);
			}
		}
 
		return parseInt(week);
	},
	init:function(){
		var _langUse='fr-FR';
 
		this.__proto__.__proto__.__defineGetter__('lang',function(){return _langUse || 'en';});
		this.__proto__.__proto__.__defineSetter__('lang',function(lang){
			if (typeof lang=='string')_langUse=lang;
		});
	}
}
 
for (var f in new dateMgr()){
	if (typeof dateMgr.prototype[f]==='function'){
		Date.prototype[f]=Date.prototype[f] || dateMgr.prototype[f];
		 delete dateMgr.prototype[f];
	}
};