在上一节图片映射那么拽中，我们讲了图片映射的使用方法，然而很多小伙伴们抱怨图片不能根据页面的窗口调整而自适应，图片地图成了摆设，今天给大家分享一个插件，有了它，小伙伴们再也不用担心图片地图走错门了。话不多说，直接上
源码：
示例HTML文件：
html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
热区图片拖拽
<script src="map.js" type="text/javascript"></script>
<script type="text/javascript">
Number.prototype.NaN0=function(){return isNaN(this)?0:this;}
var bDrag=false, mouseOffset=null;
function getMouseOffset(o,e){
var _oPos=getPosition(o), _mPos=mouseCoords(e);
return {x:_mPos.x-_oPos.x,y:_mPos.y-_oPos.y};
}
function getPosition(o){
var left=0, top=0;
while(o.offsetParent){
left+=o.offsetLeft+(o.currentStyle?(o.currentStyle.borderLeftWidth*1).NaN0():0);
top +=o.offsetTop +(o.currentStyle?(o.currentStyle.borderTopWidth*1).NaN0():0);
o=o.offsetParent;
}
left+=o.offsetLeft+(o.currentStyle?(o.currentStyle.borderLeftWidth*1).NaN0():0);
top+=o.offsetTop+(o.currentStyle?(o.currentStyle.borderTopWidth*1).NaN0():0);
return {x:left,y:top};
}
function mouseCoords(e){
if(e.pageX||e.pageY){ return {x:e.pageX,y:e.pageY}; }
return {x:e.clientX+document.body.scrollLeft-document.body.clientLeft,y:e.clientY+document.body.scrollTop-document.body.clientTop};
}
onload=function(){
var oDrag=document.getElementById('aaa'); if(!oDrag) return;
oDrag.onmousedown=function(e){
bDrag=true;
e=e||window.event;
mouseOffset=getMouseOffset(this,e); return false;
}
oDrag.onmousemove=function(e){
if(!bDrag)return;
e=e||window.event;
var _mPos = mouseCoords(e);
oDrag.style.left=(_mPos.x - mouseOffset.x)+'px';
oDrag.style.top= (_mPos.y - mouseOffset.y)+'px';
return false;
}
oDrag.onmouseup=function(){ bDrag = false; mouseOffset=null;}
var arm_img=document.getElementById('emergencyImg')
cvi_map.add(arm_img,{areacolor: '#FFFF00', bordercolor: '#60F',nofade:'true' });
canvahtml=document.getElementById("emergencyImg_canvas").innerHTML;
}
/***************************缩放测试**************************************/
//已经成功缩放并且全部调整好，缩放后高亮也出现了。只是方法比较BT，你需要自己到map.js里找更好的方式
function aa(){
var o=document.getElementById('emergencyImg')
cvi_map.remove(o);
var W1=o.offsetWidth,H1=o.offsetHeight;
var windowsWidth = document.documentElement.clientWidth * 0.7;
var windowHeight = document.documentElement.clientHeight * 0.7;
o.style.width=windowsWidth+'px';o.style.height=windowHeight+'px';
var W2=o.offsetWidth,H2=o.offsetHeight;
var rW=W2/W1, rH=H2/H1;
var areaLendth = document.getElementsByTagName('area').length;
for(var k=0;k
使用的JS插件：
var canvascheck = document.createElement('canvas');
var isIE = window.navigator.systemLanguage&&(!document.documentMode||document.documentMode<9)?1:0;
var isI8 = isIE&&document.documentMode?1:0;
var isVM = isIE&&document.namespaces?1:0;
var isCV = canvascheck.getContext?1:0;
var isJG = 0, jg = new Array();
var canvahtml;
function showCoords(map,ele,x,y,w,h) {}
function getClassValue(classes,string){
var temp = 0; var pos = string.length;
for (var j=0;j';
}else if(obj.shape.toLowerCase()=='circle') {
t += '';
}else {
for(j=2;j';
}
} canvas.innerHTML += t;
}else if(isCV) {
if(f<1) {canvas.fading = 0; canvas.style.opacity = 0;}
context = canvas.getContext("2d");
for(a=0;a0 && px==ex) {ex -= ox; }
oy = self.pageYOffset; if(oy>0 && py==ey) {ey -= oy; }
}else if(document.documentElement) {
ox = document.documentElement.scrollLeft;
oy = document.documentElement.scrollTop;
}else if(document.body) {
ox = document.body.scrollLeft; oy = document.body.scrollTop;
}
if(document.body.scrollHeight!=ph||document.body.scrollWidth!=pw) {
var o = document.getElementById(i);
var t = findPosXY(o); x = t.x; y = t.y;
}
cx = Math.min(Math.max(ex+ox-x,0),w);
cy = Math.min(Math.max(ey+oy-y,0),h);
showCoords(n,a,cx,cy,w,h);
}
function findPosXY(ele) {
var t; var d = {x:ele.offsetLeft, y:ele.offsetTop };
if(ele.offsetParent) { t = findPosXY(ele.offsetParent); d.x += t.x; d.y += t.y;}
return d;
}
function roundedRect(ctx,x,y,width,height,radius,nopath){
if (!nopath) ctx.beginPath();
ctx.moveTo(x,y+radius);
ctx.lineTo(x,y+height-radius);
ctx.quadraticCurveTo(x,y+height,x+radius,y+height);
ctx.lineTo(x+width-radius,y+height);
ctx.quadraticCurveTo(x+width,y+height,x+width,y+height-radius);
ctx.lineTo(x+width,y+radius);
ctx.quadraticCurveTo(x+width,y,x+width-radius,y);
ctx.lineTo(x+radius,y);
ctx.quadraticCurveTo(x,y,x,y+radius);
if (!nopath) ctx.closePath();
}
function getRadius(radius,width,height){
var part = (Math.min(width,height)/100);
radius = Math.max(Math.min(100,radius/part),0);
return radius + '%';
}
var cvi_map = {
defaultRadius : 0,
defaultOpacity : 33,
defaultBordercolor : '#0000ff',
defaultAreacolor : '#000000',
defaultNoborder : false,
defaultNofade : false,
defaultShowcoords : false,
defaultImgsrc : '',
defaultMapid : '',
defaultDelayed : false,
add: function(image, options) {
var w=image.offsetWidth;
var h=image.offsetHeight;
var map, mapname = image.useMap.split("#");
if(mapname[1]!=''&&mapname[1].length>=1) {map = document.getElementsByName(mapname[1])[0];}
if(image.tagName.toUpperCase() == "IMG" && map) {
var defopts = { "radius" : cvi_map.defaultRadius, "opacity" : cvi_map.defaultOpacity, "bordercolor" : cvi_map.defaultBordercolor, "areacolor" : cvi_map.defaultAreacolor, "noborder" : cvi_map.defaultNoborder, "nofade" : cvi_map.defaultNofade, "showcoords" : cvi_map.defaultShowcoords, "imgsrc" : cvi_map.defaultImgsrc, "mapid" : cvi_map.defaultMapid, "delayed" : cvi_map.defaultDelayed };
if(options) {
for(var i in defopts) { if(!options[i]) { options[i] = defopts[i]; }}
}else {
options = defopts;
}
var imageWidth = ('iwidth' in options) ? parseInt(options.iwidth) : image.width;
var imageHeight = ('iheight' in options) ? parseInt(options.iheight) : image.height;
try {
var object = image.parentNode;
object.style.position = (object.style.position=='static'||object.style.position==''?'relative':object.style.position);
object.style.height = image.height+'px';
object.style.width = image.width+'px';
object.style.padding = 0+'px';
object.style.MozUserSelect = "none";
object.style.KhtmlUserSelect = "none";
object.unselectable = "on";
var blind, bgrnd, canvas; image.jg = 0;
if(isVM) {
if(document.namespaces['v']==null) {
var e=["shape","shapetype","group","background","path","formulas","handles","fill","stroke","shadow","textbox","textpath","imagedata","line","polyline","curve","roundrect","oval","rect","arc","image"],s=document.createStyleSheet();
for(var i=0; i'].join(''));
bgrnd = document.createElement([''].join(''));
dummy = document.createElement([''].join(''));// NEW
}else if(isCV) {
canvas = document.createElement('canvas');
bgrnd = document.createElement('canvas');
}else {
canvas = document.createElement('div');
bgrnd = document.createElement('img');
bgrnd.src = image.src;
if(typeof(window['jsGraphics']) !== 'undefined') {
image.jg = parseInt(jg.length);
jg[image.jg] = new jsGraphics(canvas); isJG = 1;
}
}
canvas.id = image.id+'_canvas';
canvas.style.height = image.height+'px';
canvas.style.width = image.width+'px';
canvas.height = image.height;
canvas.width = image.width;
canvas.left = 0; canvas.top = 0;
canvas.style.position = 'absolute';
canvas.style.left = 0+'px';
canvas.style.top = 0+'px';
canvas.fading = 0;
image.className = '';
image.style.cssText = '';
image.left = 0; image.top = 0;
image.style.position = 'absolute';
/***********这里***************/
image.style.height = h+'px';
image.style.width = w+'px';
/***************************/
image.style.left = 0+'px';
image.style.top = 0+'px';
image.style.MozUserSelect = "none";
image.style.KhtmlUserSelect = "none";
image.unselectable = "on";
image.options = options;
image.canvasid = image.id+'_canvas';
image.dummyid = image.id+'_dummy'; // NEW
image.bgrndid = image.id+'_image';
image.blindid = map.name+'_blind';
image.mapname = map.name;
image.areas = map.innerHTML;
image.active = false;
if(isIE) {image.style.filter = "Alpha(opacity=0)";}else {image.style.opacity = 0; image.style.MozOpacity = 0; image.style.KhtmlOpacity = 0;}
bgrnd.id = image.bgrndid;
bgrnd.left = 0; bgrnd.top = 0;
bgrnd.style.position = 'absolute';
bgrnd.style.height = image.height+'px';
bgrnd.style.width = image.width+'px';
bgrnd.style.left = 0+'px';
bgrnd.style.top = 0+'px';
bgrnd.height = image.height;
bgrnd.width = image.width;
blind = document.createElement('div');
blind.id = image.blindid;
blind.className = "blind_area";
blind.left = 0; blind.top = 0;
blind.style.position = 'absolute';
blind.style.height = image.height+'px';
blind.style.width = image.width+'px';
blind.style.left = 0+'px';
blind.style.top = 0+'px';
blind.innerHTML = " ";
object.insertBefore(canvas,image);
object.insertBefore(bgrnd,canvas);
object.insertBefore(blind,image);
cvi_map.modify(image, options);
} catch (e) {}
}
},
modify: function(image, options) {
try {
var radius = (typeof options['radius']=='number'?options['radius']:image.options['radius']); image.options['radius']=radius;
var opacity = (typeof options['opacity']=='number'?options['opacity']:image.options['opacity']); image.options['opacity']=opacity;
var bcolor = (typeof options['bordercolor']=='string'?options['bordercolor']:image.options['bordercolor']); image.options['bordercolor']=bcolor;
var acolor = (typeof options['areacolor']=='string'?options['areacolor']:image.options['areacolor']); image.options['areacolor']=acolor;
var noborder = (typeof options['noborder']=='boolean'?options['noborder']:image.options['noborder']); image.options['noborder']=noborder;
var nofade = (typeof options['nofade']=='boolean'?options['nofade']:image.options['nofade']); image.options['nofade']=nofade;
var showcoords = (typeof options['showcoords']=='boolean'?options['showcoords']:image.options['showcoords']); image.options['showcoords']=showcoords;
var delayed = (typeof options['delayed']=='boolean'?options['delayed']:image.options['delayed']); image.options['delayed']=delayed;
var imgsrc = (typeof options['imgsrc']=='string'?options['imgsrc']:image.options['imgsrc']); image.options['imgsrc']=imgsrc;
var mapid = (typeof options['mapid']=='string'?options['mapid']:image.options['mapid']); image.options['mapid']=mapid;
/*******************还有这里***************************************/
var context, func, ih = image.offsetHeight, iw = image.offsetWidth;
/*******************************************************************/
var radius = parseInt(Math.min(Math.min(iw/4,ih/4),radius));
var opacity = opacity==0?0.33:opacity/100;
var bcolor = performRGBColor(bcolor,'#0000ff');
var acolor = performRGBColor(acolor,'#000000');
var canvas = document.getElementById(image.canvasid);
var dummy = document.getElementById(image.dummyid);
var bgrnd = document.getElementById(image.bgrndid);
var map = document.getElementsByName(image.mapname)[0];
var opac = 100;
function replace() {
if(mapid!='') {
var tmp = document.getElementById(mapid);
if(tmp) {map.innerHTML = tmp.innerHTML;}
}else {
map.innerHTML = image.areas;
}
}
function prepare() {
if(!delayed) {replace();}
for(var j=0;jseover; if(func!=null) {tmp=String(func); func=(tmp.indexOf('function')>=0?tmp.match(/\{([^}]+)\}/):tmp); func=(typeof(func)=='object'?func[1]:func);}
map.areas[j].onmouseover = new Function('setAreaOver(this,"'+canvas.id+'","'+bcolor+'","'+acolor+'",'+opacity+','+noborder+','+nofade+','+image.jg+');'+func);
func=map.areas[j].onmouseout; if(func!=null) {tmp=String(func); func=(tmp.indexOf('function')>=0?tmp.match(/\{([^}]+)\}/):tmp); func=(typeof(func)=='object'?func[1]:func);}
map.areas[j].onmouseout = new Function('setAreaOut(this,"'+canvas.id+'",'+nofade+','+image.jg+');'+func);
}else {
func = map.areas[j].getAttribute("onmouseover"); map.areas[j].setAttribute("onmouseover","setAreaOver(this,'"+canvas.id+"','"+bcolor+"','"+acolor+"',"+opacity+","+noborder+","+nofade+","+image.jg+");"+func);
func = map.areas[j].getAttribute("onmouseout"); map.areas[j].setAttribute("onmouseout","setAreaOut(this,'"+canvas.id+"',"+nofade+","+image.jg+");"+func);
}
}
}
}
if(showcoords) {
var atr, t = findPosXY(image), ph = document.body.scrollHeight, pw = document.body.scrollWidth;
if(isVM||isIE) {
image.onmousemove = new Function('getCoords(event,"'+image.mapname+'",0,"'+image.id+'",'+t.x+','+t.y+','+iw+','+ih+','+pw+','+ph+');'+image.movefunc);
}else {
image.setAttribute("onmousemove","getCoords(event,'"+image.mapname+"',0,'"+image.id+"',"+t.x+","+t.y+","+iw+","+ih+","+pw+","+ph+");"+image.movefunc);
}
if(map.length>0) {
for(var j=0;j=0?tmp.match(/\{([^}]+)\}/):tmp); func=(typeof(func)=='object'?func[1]:func);}
map.areas[j].onmousemove = new Function('getCoords(event,"'+image.mapname+'","'+atr+'","'+image.id+'",'+t.x+','+t.y+','+iw+','+ih+','+pw+','+ph+');'+func);
}else {
func = map.areas[j].getAttribute("onmousemove"); map.areas[j].setAttribute("onmousemove","getCoords(event,'"+image.mapname+"','"+atr+"','"+image.id+"',"+t.x+","+t.y+","+iw+","+ih+","+pw+","+ph+");"+func);
}
}
}
}
}
}
}
if(canvas && bgrnd && map) {
if(isCV) {
context = canvas.getContext("2d");
context.clearRect(0,0,canvas.width,canvas.height);
}else if(isVM) {
canvas.innerHTML = '';
}else {
if(isIE) {canvas.style.filter = "Alpha(opacity="+(opacity*100)+")";}else { canvas.style.opacity = opacity; canvas.style.MozOpacity = opacity; canvas.style.KhtmlOpacity = opacity;}
if(isJG) {jg[image.jg].clear();}
}
if(delayed) {replace(); }
if(isCV) {
if(imgsrc!='') {
var img = new Image();
img.onload = function() {
context = bgrnd.getContext("2d");
context.clearRect(0,0,bgrnd.width,bgrnd.height);
context.save();
if(radius>0) {
roundedRect(context,0,0,bgrnd.width,bgrnd.height,radius);
context.clip();
}
context.fillStyle = 'rgba(0,0,0,0)';
context.fillRect(0,0,bgrnd.width,bgrnd.height);
context.drawImage(img,0,0,bgrnd.width,bgrnd.height);
context.restore();
prepare();
}
img.src = imgsrc;
}else {
context = bgrnd.getContext("2d");
context.clearRect(0,0,bgrnd.width,bgrnd.height);
context.save();
if(radius>0) {
roundedRect(context,0,0,bgrnd.width,bgrnd.height,radius);
context.clip();
}
context.fillStyle = 'rgba(0,0,0,0)';
context.fillRect(0,0,bgrnd.width,bgrnd.height);
context.drawImage(image,0,0,bgrnd.width,bgrnd.height);
context.restore();
prepare();
}
}else if(isVM) {
if(radius>0) {radius = getRadius(radius,bgrnd.width,bgrnd.height);}
bgrnd.innerHTML = '';
prepare();
}else {
bgrnd.src = imgsrc!=''?imgsrc:image.src;
prepare();
} image.active = true;
if(isVM||isIE) {
func = image.onmousemove; if(func!=null) {tmp=String(func); func=(tmp.indexOf('function')>=0?tmp.match(/\{([^}]+)\}/):tmp); func=(typeof(func)=='object'?func[1]:func);} image.movefunc = func;
}else {
image.movefunc = image.getAttribute("onmousemove");
}
}
} catch (e) {}
},
remove : function(image) {
var ele, object = image.parentNode;
if(image.active) {
if(isIE) { image.style.filter = "Alpha(opacity=100)";}else {image.style.opacity = 100; image.style.MozOpacity = 100; image.style.KhtmlOpacity = 100;}
ele = document.getElementsByName(image.mapname)[0]; ele.innerHTML = image.areas; image.active = false; image.areas = '';
if(isVM||isIE) {image.onmousemove = image.movefunc;}else {image.setAttribute("onmousemove",image.movefunc);}
ele = document.getElementById(image.canvasid); if(ele) {object.removeChild(ele);}
ele = document.getElementById(image.blindid); if(ele) {object.removeChild(ele);}
ele = document.getElementById(image.bgrndid); if(ele) {object.removeChild(ele);}
}
}
}
显示的效果图：
