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- /*
- delayedLoader - JS to delay out of sight pictures rendering
-
- Version : 2.0.2
- Made by : Jean-Damien POGOLOTTI
- Last Update : 10/12/10
-
- This file can be distributed under the license you can find at :
-
- http://www.pchart.net/license
-
- You can find the whole class documentation on the pChart web site.
- */
-
- var PictureCache = new Array();
- var PictureCount = 0;
- var WaitPicture = "wait.gif";
- var DivClassName = "pChart";
- var DefaultWidth = 70;
- var DefaultHeight = 230;
- var DefaultAlt = "pChart rendered picture";
-
-
- /* Do the DOM document processing */
- function loaderInit()
- {
- WindowSize = getWindowSize();
- WindowHeight = WindowSize[1];
- Offset = getScrollXY();
- HeightOffset = Offset[1];
-
- /* Enumerate the tags */
- Links = document.getElementsByTagName("a");
- for (i = 0; i < Links.length; i++)
- {
- className = Links[i].className;
-
- if ( className == DivClassName )
- {
- ObjectWidth = Links[i].getAttribute("data-pchart-width");
- ObjectHeight = Links[i].getAttribute("data-pchart-height");
- ObjectID = Links[i].id;
- ObjectTop = Links[i].offsetTop;
- ObjectURL = Links[i].href;
- ObjectAlt = Links[i].getAttribute("data-pchart-alt");
-
- if ( ObjectWidth == null ) { ObjectWidth = DefaultWidth; }
- if ( ObjectHeight == null ) { ObjectHeight = DefaultHeight; }
- if ( ObjectAlt == null ) { ObjectAlt = DefaultAlt; }
-
- if (ObjectID == "") { ObjectID = "pChart-"+i; Links[i].id = ObjectID; }
-
- PictureCache[PictureCount] = new Array();
- PictureCache[PictureCount][0] = ObjectID;
- PictureCache[PictureCount][1] = ObjectTop;
- PictureCache[PictureCount][2] = ObjectURL;
- PictureCache[PictureCount][3] = ObjectAlt;
- PictureCache[PictureCount][4] = ObjectWidth;
- PictureCache[PictureCount][5] = ObjectHeight;
-
- PictureCount++;
- }
- }
-
- /* Replace the <A> tags by <DIV> ones and attach the loader */
- for(i=0;i<PictureCount;i++)
- {
- ATag = document.getElementById(PictureCache[i][0]);
- DivTag = document.createElement("div");
- DivID = "pChart-Div"+i; PictureCache[i][0] = DivID;
-
- DivTag.setAttribute("id", DivID);
- DivTag.style.width = PictureCache[i][4];
- DivTag.style.height = PictureCache[i][5];
- DivTag.style.backgroundColor = "#E0E0E0";
-
- DivTag2 = ATag.parentNode.replaceChild(DivTag, ATag);
-
- DivTop = DivTag.offsetTop;
- PictureCache[i][1] = DivTop;
-
- changeOpac(50, i);
- changeContent("<img src='"+WaitPicture+"' width=24 height=24 alt=''/>",i);
-
- if ( HeightOffset + WindowHeight > PictureCache[i][1] ) { triggerVisible(i); }
- }
- }
-
- /* Replace the contents of the delayed loading DIV */
- function changeContent(html, id)
- { DivID = PictureCache[id][0]; document.getElementById(DivID).innerHTML = html; }
-
- /* Trigger the picture rendering when the pChart DIV became visible */
- function triggerVisible(PictureID)
- {
- if ( !PictureCache[PictureID][6] == true )
- {
- PictureCache[PictureID][6] = true;
- ajaxRender(PictureCache[PictureID][2],PictureID);
- }
- }
-
- /* Catch the navigator window scrolling event */
- function scrollEvent()
- {
- WindowSize = getWindowSize();
- WindowHeight = WindowSize[1];
- Offset = getScrollXY();
- HeightOffset = Offset[1];
-
- for(i=0;i<=PictureCount-1;i++) { if ( HeightOffset + WindowHeight > PictureCache[i][1] ) { triggerVisible(i); } }
- }
-
- /* Cross browser X/Y window offset gatherer */
- function getScrollXY()
- {
- var scrOfX = 0, scrOfY = 0;
-
- if( typeof( window.pageYOffset ) == 'number' )
- { scrOfY = window.pageYOffset; scrOfX = window.pageXOffset; }
- else if( document.body && ( document.body.scrollLeft || document.body.scrollTop ) )
- { scrOfY = document.body.scrollTop; scrOfX = document.body.scrollLeft; }
- else if( document.documentElement && ( document.documentElement.scrollLeft || document.documentElement.scrollTop ) )
- { scrOfY = document.documentElement.scrollTop; scrOfX = document.documentElement.scrollLeft; }
-
- return [ scrOfX, scrOfY ];
- }
-
- /* Cross browser X/Y window size gatherer */
- function getWindowSize()
- {
- var myWidth = 0, myHeight = 0;
-
- if( typeof( window.innerWidth ) == 'number' )
- { myWidth = window.innerWidth; myHeight = window.innerHeight; }
- else if( document.documentElement && ( document.documentElement.clientWidth || document.documentElement.clientHeight ) )
- { myWidth = document.documentElement.clientWidth; myHeight = document.documentElement.clientHeight; }
- else if( document.body && ( document.body.clientWidth || document.body.clientHeight ) )
- { myWidth = document.body.clientWidth; myHeight = document.body.clientHeight; }
-
- return [ myWidth, myHeight ];
- }
-
- /* Cross browser alpha transparency changer */
- function changeOpac(opacity, id)
- {
- DivID = PictureCache[id][0];
-
- var object = document.getElementById(DivID).style;
- object.opacity = (opacity / 100);
- object.MozOpacity = (opacity / 100);
- object.KhtmlOpacity = (opacity / 100);
- object.filter = "alpha(opacity=" + opacity + ")";
- }
-
- /* Shade in-out function */
- function opacity(id, opacStart, opacEnd, millisec)
- {
- var speed = Math.round(millisec / 100);
- var timer = 0;
-
- if(opacStart > opacEnd)
- {
- for(i = opacStart; i >= opacEnd; i--)
- {
- setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
- timer++;
- }
- }
- else if(opacStart < opacEnd)
- {
- for(i = opacStart; i <= opacEnd; i++)
- {
- setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
- timer++;
- }
- }
- }
-
- /* Start the loader */
- function StartFade(PictureID)
- {
- Loader = new Image();
- URL = PictureCache[PictureID][2];
- Loader.src = URL;
- setTimeout("CheckLoadingStatus("+PictureID+")", 200);
- }
-
- /* check the picture loading status */
- function CheckLoadingStatus(PictureID)
- {
- DivID = PictureCache[PictureID][0];
- URL = PictureCache[PictureID][2];
- Alt = PictureCache[PictureID][3];
-
- if ( Loader.complete == true )
- {
- changeOpac(0, PictureID);
- HTMLResult = "<center><img src='" + URL + "' alt='"+Alt+"'/></center>";
- document.getElementById(DivID).innerHTML = HTMLResult;
-
- opacity(PictureID,0,100,100);
- }
- else
- setTimeout("CheckLoadingStatus("+PictureID+")", 200);
- }
-
- /* Compute the pChart picture in background */
- function ajaxRender(URL,PictureID)
- {
- var xmlhttp=false;
- /*@cc_on @*/
- /*@if (@_jscript_version >= 5)
- try { xmlhttp = new ActiveXObject("Msxml2.XMLHTTP"); } catch (e) { try { xmlhttp = new ActiveXObject("Microsoft.XMLHTTP"); } catch (E) { xmlhttp = false; } }
- @end @*/
-
- if (!xmlhttp && typeof XMLHttpRequest!='undefined')
- { try { xmlhttp = new XMLHttpRequest(); } catch (e) { xmlhttp=false; } }
-
- if (!xmlhttp && window.createRequest)
- { try { xmlhttp = window.createRequest(); } catch (e) { xmlhttp=false; } }
-
- xmlhttp.open("GET", URL,true);
-
- xmlhttp.onreadystatechange=function()
- { if (xmlhttp.readyState==4) { StartFade(PictureID); } }
- xmlhttp.send(null)
- }