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jquery點(diǎn)擊頁(yè)面任何區(qū)域?qū)崿F(xiàn)鼠標(biāo)焦點(diǎn)十字效果

更新時(shí)間：2013年06月21日 16:52:01 作者：

鼠標(biāo)點(diǎn)擊聚焦，地圖定位，在圖片上突出顯示，焦點(diǎn)定位頁(yè)面元素，這些都是在系統(tǒng)開(kāi)發(fā)是經(jīng)常需要用到的，下面為大家介紹下具體的實(shí)現(xiàn)，感興趣的朋友可以參考下哈

系統(tǒng)開(kāi)發(fā)時(shí)很多地方需要有焦點(diǎn)效果，例如：鼠標(biāo)點(diǎn)擊聚焦，地圖定位，在圖片上突出顯示，焦點(diǎn)定位頁(yè)面元素。
本小功能通過(guò)jquery和graphics二次開(kāi)發(fā)，實(shí)現(xiàn)通過(guò)鼠標(biāo)點(diǎn)擊頁(yè)面任何區(qū)域，聚焦當(dāng)前點(diǎn)擊位置。適用于頁(yè)面任何元素的位置效果。
首先引入jquery引擎包:jquery-1.4.2.min.js和graphics.js
源碼下載地址
編寫(xiě)實(shí)現(xiàn)效果js文件，qfocus.js,源碼如下：

復(fù)制代碼代碼如下:

 
var qfocus = { 
config:{ 
"bar_dis":true,//橫豎條顯示或隱藏 
"circle_dis":true,//焦點(diǎn)隱藏 
"bar_color":"black",//線(xiàn)條顏色 
"circle_color":"red",//圓圈顏色 
"rect_color":"green"http://方塊顏色 
}, 
locationTimer: null,//時(shí)間控制標(biāo)識(shí)符 
onmouseClick: function(ev){//鼠標(biāo)點(diǎn)擊獲取鼠標(biāo)位置畫(huà)聚焦效果 
var point = this.mousePosition(ev); 
this.showFocus(point); 
}, 
onclickElement:function(obj) {//鼠標(biāo)點(diǎn)擊獲取坐標(biāo)做焦點(diǎn) 
var _point = this.elementPosition(obj); 
this.showFocus(_point); 
}, 
showFocus:function (point) {//顯示焦點(diǎn)效果 
if (this.locationTimer) { 
clearTimeout(this.locationTimer); 
} //清除定時(shí)器 
var mapDiv = "#mapdiv"; 
var _point = point; 
var canvas = $("#canvas"); 
var vLine = $("#vline"); 
var hLine = $("#hline"); 
//焦點(diǎn)隱藏或顯示 
if (this.config["circle_dis"] == true) { 
if (!$("#canvas").attr("id")) { 
canvas = '<div id="canvas" style="left:' + (_point.x - 25) + 'px;top:' + (_point.y - 25) + 'px;width:50px;height:50px;overflow:hidden;position:absolute;border:solid 0px red;"/>'; 
$(canvas).appendTo("body"); 
} else { 
canvas.css("left", (_point.x - 25) + "px"); 
canvas.css("top", (_point.y - 25) + "px"); 
canvas.show(); 
} 
paper = Raphael("canvas"); 
paper.clear(); 
var rect = paper.rect(20, 20, 10, 10, 0); 
rect.attr("stroke", this.config["rect_color"]); 
rect.attr("stroke-width", 1); 
} 
//是否顯示橫豎條 
if (this.config["bar_dis"] == true) { 
if (!$("#vline").attr("id")) { 
vLine = "<div id='vline' style='background-color:"+this.config["bar_color"]+";height:100%;width:1px;position:absolute;top:0px;left:" + (_point.x) + "px;'/>"; 
$(vLine).appendTo("body"); 
} else { 
$(vLine).css("left",(_point.x) + "px"); 
vLine.show(); 
} 
if (!$("#hline").attr("id")) { 
var hLine = "<div id='hline' style='overflow:hidden;background-color:"+this.config["bar_color"]+";height:1px;width:100%;position:absolute;left:0px;top:" + (_point.y ) + "px;'/>"; 
$(hLine).appendTo("body"); 
} else { 
$("#hline").css("top",(_point.y ) + "px"); 
hLine.show(); 
} 
} 
this.hideFocus(); 
return true; 
}, hideFocus:function() {//隱藏焦點(diǎn)效果 
if (paper != null) { 
var circle = paper.circle(25, 25, 30); 
circle.attr("stroke", this.config["circle_color"]); 
circle.attr("stroke-width", 1); 
var anim = Raphael.animation({ 
r: 5 
}, 900, null, function(){ 
this.locationTimer = setTimeout(function(){ 
$("#canvas").hide(); //焦點(diǎn) 
$("#vline").hide(); //橫條 
$("#hline").hide(); //豎條 
clearTimeout(this.locationTimer); 
}, 500); 
}); 
circle.animate(anim); 
} else { 
this.locationTimer = setTimeout(function(){ 
$("#canvas").hide(); //焦點(diǎn) 
$("#vline").hide(); //橫條 
$("#hline").hide(); //豎條 
clearTimeout(this.locationTimer); 
}, 500); 
} 

},mousePosition:function (e) { 
var x,y; 
var e = e||window.event; 
return { 
x:e.clientX+document.body.scrollLeft+document.documentElement.scrollLeft, 
y:e.clientY+document.body.scrollTop+document.documentElement.scrollTop 
} 
},elementPosition:function( oElement ) { 
var x2 = 0; 
var y2 = 0; 
var width = oElement.offsetWidth; 
var height = oElement.offsetHeight; 
var postion = ""; 
if( typeof( oElement.offsetParent ) != 'undefined' ){ 
for( var posX = 0, posY = 0; oElement; oElement = oElement.offsetParent ) { 
posX += oElement.offsetLeft; 
posY += oElement.offsetTop; 
} 
x2 = posX + width; 
y2 = posY + height; 
postion = [ posX, posY ,x2, y2]; 
} else{ 
x2 = oElement.x + width; 
y2 = oElement.y + height; 
postion = [ oElement.x, oElement.y, x2, y2]; 
} 
var x = postion[0] + ((postion[2] - postion[0])/2); 
var y = postion[1] + ((postion[3] - postion[1])/2); 
return {"x":x,"y":y}; 
} 
} 

html頁(yè)面調(diào)用源碼：

復(fù)制代碼代碼如下:

 
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 
<html> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> 
<script type="text/javascript" src="js/jquery-1.4.2.min.js"></script> 
<script type="text/javascript" src="js/graphics.js"></script> 
<script type="text/javascript" src="js/qfocus.js"></script> 
<title>qfocus</title> 
<script type="text/javascript"> 
function forward(ev){ 
qfocus.onmouseClick(ev); 
} 
document.onmousedown=forward; 
</script> 
</head> 
<body> 
</body> 
</html> 