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JavaScript Basics

Inserting Javascript

Complete Tutorial

Advance DHTML Tutorial


Ants			[View Sample]


As you move your mouse around the page a swarming army of ants scattered about the window will chase after it. (No wisecracks about buggy code now...) If an ant actually reaches the mouse cursor, we reposition it randomly around the edge of the window, and its chase starts again. The ant images are preloaded with a great image loading bar script, then the script begins. A great effect!

Insert into <HEAD>
<style type="text/css"> .ant { height: 16px; position: absolute; visibility: hidden; width: 16px; } </style> <SCRIPT LANGUAGE="JavaScript"> <!-- Original: Mike Hall (MHall75819@aol.com) --> <!-- Web Site: http://members.aol.com/MHall75819 --> <!-- Begin var dir = "/javascripts/Games/Ants/"; // get the ant images in a single zip file from // http://javascript.internet.com/img/ants/ants.zip // Extract the images then upload them to your server and // change the 'dir' variable to their location (end with a '/') var images = new Array( dir+"antdl.gif", dir+"antdn.gif", dir+"antdr.gif", dir+"antlt.gif", dir+"antrt.gif", dir+"antul.gif", dir+"antup.gif", dir+"antur.gif" ); var isMinNS4 = (document.layers) ? 1 : 0; var isMinIE4 = (document.all) ? 1 : 0; var _LBimgList; var _LBimgCount; var _LBbase = "LBbase"; var _LBlow = "LBlow"; var _LBhigh = "LBhigh"; var _LBwidth; var _LBheight; var _LBbaseLayer; var _LBlowLayer; var _LBhighLayer; function createLoadBar(width, height, bdSize, bdColor, bgColor, fgColor, fontFace, fontSize, text) { var txtLow, txtHigh, tblStart, tblEnd; var str; txtLow = '<font color="' + fgColor + '" face="' + fontFace + '" size=' + fontSize + '>' + text + '</font>'; txtHigh = '<font color="' + bgColor + '" face="' + fontFace + '" size=' + fontSize + '>' + text + '</font>'; tblStart = '<table border=0 cellpadding=0 cellspacing=0 height=100% width=100%><tr valign="center"><td align="center">'; tblEnd = '</td></tr></table>'; if (isMinNS4) str = '<layer name="' + _LBbase + '" bgcolor="' + bdColor + '" width=' + width + ' height=' + height + ' visibility="hide">\n' + ' <layer name="' + _LBlow + '" bgcolor="' + bgColor + '" left=' + bdSize + ' top=' + bdSize + ' width=' + (width - 2 * bdSize) + ' height=' + (height - 2 * bdSize) + '>' + tblStart + txtLow + tblEnd + '</layer>\n' + ' <layer name="' + _LBhigh + '" bgcolor="' + fgColor + '" left=' + bdSize + ' top=' + bdSize + ' width=' + (width - 2 * bdSize) + ' height=' + (height - 2 * bdSize) + '>' + tblStart + txtHigh + tblEnd + '</layer>\n' + '</layer>'; if (isMinIE4) str = '<div id="' + _LBbase + '" style="position:absolute; background-color:' + bdColor + '; width:' + width + 'px; height:' + height + 'px; visibility:hidden;">\n' + ' <div id="' + _LBlow + '" style="position:absolute; background-color=' + bgColor + '; left:' + bdSize + 'px; top:' + bdSize + 'px; width:' + (width - 2 * bdSize) + 'px; height:' + (height - 2 * bdSize) + 'px;">' + tblStart + txtLow + tblEnd + '</div>\n' + ' <div id="' + _LBhigh + '" style="position:absolute; background-color=' + fgColor + '; left:' + bdSize + 'px; top:' + bdSize + 'px; width:' + (width - 2 * bdSize) + 'px; height:' + (height - 2 * bdSize) + 'px;">' + tblStart + txtHigh + tblEnd + '</div>\n' + '</div>'; document.writeln(str); _LBwidth = width - 2 * bdSize; _LBheight = height - 2 * bdSize; } function startLoadBar(srcList, x, y) { var i, w, h; if (isMinNS4) { _LBbaseLayer = document.layers[_LBbase]; _LBlowLayer = _LBbaseLayer.document.layers[_LBlow]; _LBhighLayer = _LBbaseLayer.document.layers[_LBhigh]; } if (isMinIE4) { _LBbaseLayer = eval('document.all.' + _LBbase); _LBlowLayer = eval('document.all.' + _LBlow); _LBhighLayer = eval('document.all.' + _LBhigh); } if (isMinNS4) { w = window.innerWidth; h = window.innerHeight; } if (isMinIE4) { w = document.body.clientWidth; h = document.body.clientHeight; } if (x == null) x = Math.round((w - _LBwidth) / 2); if (y == null) y = Math.round((h - _LBheight) / 2); moveLayerTo(_LBbaseLayer, x, y); clipLayer(_LBhighLayer, 0, 0, 0, _LBheight); showLayer(_LBbaseLayer); _LBimgCount = 0; _LBimgList = new Array(); for (i = 0; i < srcList.length; i++) { _LBimgList[i] = new Image(); _LBimgList[i].onabort = _LBupdate; _LBimgList[i].onerror = _LBupdate; _LBimgList[i].onload = _LBupdate; } for (i = 0; i < srcList.length; i++) _LBimgList[i].src = srcList[i]; } function endLoadBar() { // empty (can be changed) function called when finished } function _LBupdate() { var pct; _LBimgCount++; pct = _LBimgCount / _LBimgList.length; clipLayer(_LBhighLayer, 0, 0, Math.round(pct * _LBwidth), _LBheight); if (_LBimgCount == _LBimgList.length) { setTimeout('hideLayer(_LBbaseLayer)', 500); endLoadBar(); } } function moveLayerTo(layer, x, y) { if (isMinNS4) layer.moveTo(x, y); if (isMinIE4) { layer.style.left = x; layer.style.top = y; } } function hideLayer(layer) { if (isMinNS4) layer.visibility = "hide"; if (isMinIE4) layer.style.visibility = "hidden"; } function getWindowWidth() { if (isMinNS4) return(window.innerWidth); if (isMinIE4) return(document.body.offsetWidth); return(-1); } function getWindowHeight() { if (isMinNS4) return(window.innerHeight); if (isMinIE4) return(document.body.offsetHeight); return(-1); } function getPageScrollX() { if (isMinNS4) return(window.pageXOffset); if (isMinIE4) return(document.body.scrollLeft); return(-1); } function getPageScrollY() { if (isMinNS4) return(window.pageYOffset); if (isMinIE4) return(document.body.scrollTop); return(-1); } function getHeight(layer) { if (isMinNS4) { if (layer.document.height) return(layer.document.height); else return(layer.clip.bottom - layer.clip.top); } if (isMinIE4) { if (false && layer.style.pixelHeight) return(layer.style.pixelHeight); else return(layer.clientHeight); } return(-1); } function getWidth(layer) { if (isMinNS4) { if (layer.document.width) return(layer.document.width); else return(layer.clip.right - layer.clip.left); } if (isMinIE4) { if (layer.style.pixelWidth) return(layer.style.pixelWidth); else return(layer.clientWidth); } return(-1); } function getLeft(layer) { if (isMinNS4) return(layer.left); if (isMinIE4) return(layer.style.pixelLeft); return(-1); } function getTop(layer) { if (isMinNS4) return(layer.top); if (isMinIE4) return(layer.style.pixelTop); return(-1); } function getRight(layer) { if (isMinNS4) return(layer.left + getWidth(layer)); if (isMinIE4) return(layer.style.pixelLeft + getWidth(layer)); return(-1); } function getBottom(layer) { if (isMinNS4) return(layer.top + getHeight(layer)); else if (isMinIE4) return(layer.style.pixelTop + getHeight(layer)); return(-1); } function moveLayerBy(layer, dx, dy) { if (isMinNS4) layer.moveBy(dx, dy); if (isMinIE4) { layer.style.pixelLeft += dx; layer.style.pixelTop+= dy; } } function showLayer(layer) { if (isMinNS4) layer.visibility = "show"; if (isMinIE4) layer.style.visibility = "visible"; } function clipLayer(layer, clipleft, cliptop, clipright, clipbottom) { if (isMinNS4) { layer.clip.left = clipleft; layer.clip.top= cliptop; layer.clip.right= clipright; layer.clip.bottom = clipbottom; } if (isMinIE4) layer.style.clip = 'rect(' + cliptop + ' ' +clipright + ' ' + clipbottom + ' ' + clipleft +')'; } var mouseX = 0; var mouseY = 0; if (isMinNS4) document.captureEvents(Event.MOUSEMOVE); document.onmousemove = getMousePosition; function init() { startLoadBar(images); } function getMousePosition(e) { if (isMinNS4) { mouseX = e.pageX; mouseY = e.pageY; } if (isMinIE4) { mouseX = event.clientX + document.body.scrollLeft; mouseY = event.clientY + document.body.scrollTop; } return true; } var ants = new Array(8); function endLoadBar() { var i; for (i = 0; i < ants.length; i++) { if (isMinNS4) { ants[i] = document.layers["ant" + (i + 1)]; ants[i].image = ants[i].document.images["antimg" + (i + 1)]; } if (isMinIE4) { ants[i] = eval('document.all.ant' + (i + 1)); ants[i].image = document.images["antimg" + (i + 1)]; } initAnt(i); showLayer(ants[i]); } updateAnts(); } function initAnt(n) { var s, x, y; x = Math.floor(Math.random() * getWindowWidth()); y = Math.floor(Math.random() * getWindowHeight()); s = Math.floor(Math.random() * 4); if (s == 0) x = -getWidth(ants[n]); if (s == 1) x = getWindowWidth(); if (s == 2) y = -getHeight(ants[n]); if (s == 3) y = getWindowHeight(); x += getPageScrollX(); y += getPageScrollY(); moveLayerTo(ants[n], x, y); } function updateAnts() { var i, dx, dy, theta, d; d = 3; for (i = 0; i < ants.length; i++) { dx = mouseX - getLeft(ants[i]); dy = mouseY - getTop(ants[i]); theta = Math.round(Math.atan2(-dy, dx) * 180 / Math.PI); if (theta < 0) theta += 360; if (Math.abs(dx) < d && Math.abs(dy) < d) initAnt(i); else if (theta > 22.5 && theta <= 67.5) { moveLayerBy(ants[i], d, -d); ants[i].image.src = dir+"antur.gif"; } else if (theta > 67.5 && theta <= 112.5) { moveLayerBy(ants[i], 0, -d); ants[i].image.src = dir+"antup.gif"; } else if (theta > 112.5 && theta <= 157.5) { moveLayerBy(ants[i], -d, -d); ants[i].image.src = dir+"antul.gif"; } else if (theta > 157.5 && theta <= 202.5) { moveLayerBy(ants[i], -d, 0); ants[i].image.src = dir+"antlt.gif"; } else if (theta > 202.5 && theta <= 247.5) { moveLayerBy(ants[i], -d, d); ants[i].image.src = dir+"antdl.gif"; } else if (theta > 247.5 && theta <= 292.5) { moveLayerBy(ants[i], 0, d); ants[i].image.src = dir+"antdn.gif"; } else if (theta > 292.5 && theta <= 337.5) { moveLayerBy(ants[i], d, d); ants[i].image.src = dir+"antdr.gif"; } else { moveLayerBy(ants[i], d, 0); ants[i].image.src = dir+"antrt.gif"; } } setTimeout('updateAnts()', 50); return; } // End --> </script>

Insert into <BODY>
<BODY OnLoad="init()" bgcolor="#FFFFFF"> <script language="JavaScript"> createLoadBar(240, 20, 1, "#000000", "#cccccc", "#999999", "MS Sans serif,Arial,Helvetica", 1, "<b>Loading ants, please wait...</b>"); </script> <div id="ant1" class="ant"><img name="antimg1" src="transparent.gif" width=13 height=13></div> <div id="ant2" class="ant"><img name="antimg2" src="transparent.gif" width=13 height=13></div> <div id="ant3" class="ant"><img name="antimg3" src="transparent.gif" width=13 height=13></div> <div id="ant4" class="ant"><img name="antimg4" src="transparent.gif" width=13 height=13></div> <div id="ant5" class="ant"><img name="antimg5" src="transparent.gif" width=13 height=13></div> <div id="ant6" class="ant"><img name="antimg6" src="transparent.gif" width=13 height=13></div> <div id="ant7" class="ant"><img name="antimg7" src="transparent.gif" width=13 height=13></div> <div id="ant8" class="ant"><img name="antimg8" src="transparent.gif" width=13 height=13></div>

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