1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 | /* 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) } |