javascript实现了颜色选择并现出对应的颜色值
效果演示 javascript颜色器
<html>
<head>
<title>javascript颜色选择</title>
<meta http-equiv="content-type" content="text/html; charset=gb2312">
<style type="text/css">
body{background-color: buttonface; }
input{font-size:9pt;font-family: "verdana,tahoma,arial,sans-serif";}
button{height:24px;font-size:10pt;font-family: "verdana,tahoma,arial,sans-serif";}
</style>
</head>
<body onSelectStart="return false;" style="margin: 0px;padding: 0px;">
<script language="JavaScript">
document.title="颜色选择"+ document.title;
var iW = 30;//共有6种颜色，每种颜色的宽为iW。iW*6为色带的宽。
var iH = '152';//iH为色带的高。
var iT =20;
var iL = 0;
//var iT = (document.body.offsetHeight-iH)/2;
var H,S,V;
var sr,sg,sb;
var curColor="#000000";
</script>
<table cellspacing="0" cellpadding="0">
<tr>
<td>
<input type=text disabled=true size=9 id=ShowColor style="background-color:#000000;disabled:true;"><input type=text disabled=true size=15 id=SelColor value="#000000">
</td>
</tr>
</table>
<script language="Javascript">
function SetColor(){
SelColor.value=curColor.toUpperCase();
ShowColor.style.background=curColor;
}
function HSV(){
var pX = event.offsetX;
var pY = event.offsetY;
var HalfH = parseInt(iH/2);
H = parseInt(pX*360/(iW*6));
if(event.offsetY < HalfH){
S = pY/HalfH;
V = 1;
}else{
S = 1;
V = (iH-pY)/HalfH;
}
HSVtoRGB();
rgb=RGB2HTML();
//HSV.value = 'H:'+H+' S:'+parseInt(S*100)+'% V:'+parseInt(V*100)+'%';
//RGB.value = 'R:'+sr+' G:'+sg+' B:'+sb;
SelColor.value="#"+rgb.toUpperCase();
ShowColor.style.background= '#'+rgb;
}
function HSVtoRGB(){
var r,g,b;
var k = (H%60)/60;
var c1 = V*(1-S);
var c2 = V*(1-S*k);
var c3 = V*(1-S*(1-k));
switch(parseInt(H/60)){
case 0 : r=V,g=c3;b=c1; break;
case 1 : r=c2,g=V;b=c1; break;
case 2 : r=c1,g=V;b=c3; break;
case 3 : r=c1,g=c2;b=V; break;
case 4 : r=c3,g=c1;b=V; break;
case 5 : r=V,g=c1;b=c2; break;
}
sr = parseInt(r*255);
sg = parseInt(g*255);
sb = parseInt(b*255);
}
function RGB2HTML(){
var r=(sr>=16)?sr.toString(16):('0'+sr.toString(16));
var g=(sg>=16)?sg.toString(16):('0'+sg.toString(16));
var b=(sb>=16)?sb.toString(16):('0'+sb.toString(16));
return r+g+b;
}
function finsh(){
window.returnValue = SelColor.value;
window.close();
}
function window.onload(){
var iHtml = '';
var RainBow = [255,0,0, 255,255,0, 0,255,0, 0,255,255, 0,0,255, 255,0,255, 255,0,0];
for(var i=0;i<6;i++){
var R1 = RainBow[i*3];
var G1 = RainBow[i*3+1];
var B1 = RainBow[i*3+2];
var R2 = RainBow[(i+1)*3];
var G2 = RainBow[(i+1)*3+1];
var B2 = RainBow[(i+1)*3+2];
iHtml += "<span style='position:absolute;left:"+(i*iW+iL)+";top:"+iT+";width:"+iW+";height:"+iH+";background:rgb("+R1+","+G1+","+B1+");'></span><span style='position:absolute;left:"+(i*iW+iL)+";top:"+iT+";width:"+iW+";height:"+iH+";background:rgb("+R2+","+G2+","+B2+");filter:alpha(opacity=0,finishopacity=100,Style=1);'></span>"
}
iHtml += "<span style=position:absolute;left:"+iL+";top:"+iT+";width:"+iW*6+";height:"+iH/2+";background:rgb(255,255,255);filter:alpha(opacity=100,finishOpacity=0,style=1,starty=0,finishy=100,startx=0,finishx=0)></span><span style=position:absolute;left:"+iL+";top:"+(iT+iH/2)+";width:"+iW*6+";height:"+iH/2+";background:rgb(0,0,0);filter:alpha(opacity=0,finishOpacity=100,style=1,starty=0,finishy=100,startx=0,finishx=0)></span><span style='cursor:crosshair;position:absolute;left:"+iL+";top:"+iT+";width:"+iW*6+";height:"+iH+";' onmousemove=HSV() ondblclick=finsh() onclick='curColor=SelColor.value' onmouseout=SetColor()></span>"
document.body.innerHTML+=iHtml;
SetColor();
}
</script>
</body>
</html>
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