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动态改变背景颜色的小控件

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动态改变背景颜色的小控件

可以通过样式修改控件的位置及控件大小,可以通过参数指定要改变背景颜色的目标对象,如果不指定,则默认改变body的背景颜色。

 

<?xml version="1.0" encoding="UTF-8" ?>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>改变背景颜色的小控件</title>
<style>
<!--
#idContainer{
	position:relative;
	width:100px;
	height:100px;
	border:solid 5px #777777;
}
.outerLyr{
	background-color:red; 
	position: absolute; 
	height:100%; 
	width: 15%; 
	z-index: 1;
	float:left;
	display:inline;
	left:10%;
}
.outerLyr1{
	background-color:green; 
	position: absolute; 
	height:100%; 
	width: 15%; 
	z-index: 1;
	float:left;
	display:inline;
	left:40%;
}
.outerLyr2{
	background-color:blue; 
	position: absolute; 
	height:100%; 
	width: 15%; 
	z-index: 1;
	float:left;
	display:inline;
	left:70%;
}
.drag{
	position:absolute;
	height: 15%; 
	width: 84%; 
	z-index: 3;
	left:8%;
	cursor: hand;
	bottom:0px;
	background:black;
	top:20%;
}
.innerLyr{
	background-color: #777777; 
	position: absolute; 
	height: 98%; 
	width: 84%; 
	z-index: 2;
	text-align:center;
	left:8%;
	top:1%;
}
.barLyr{
	background-color: #000000; 
	position: absolute; 
	height: 90%; 
	width: 10%; 
	z-index: 1;
	top:5%;
}
-->
</style>
</head>
<body>
<div id="idContainer"></div>
<div id="idObj" style="position:absolute;left:200px;height:100px;width:100px;height:100px;border:1px solid black;background:white"></div>
<script type="text/javascript">
<!--
var cp = new ColorPalette("idContainer", "idObj");
//-->
</script>
</body>
</html>

 

 

在<head>内插入如下JS代码:

<script type="text/javascript">
<!--
var $ = function(id) {
	return "string" == typeof id ? document.getElementById(id) : id;
};
// 实例化一个对象并调用对象的initialize方法
var Class = {
	create : function() {
		return function() {
			this.initialize.apply(this, arguments);
		};
	}
};
//为对象注册事件
var addEventHandler = function(oTarget, sEventType, fnHandler) {
	if (oTarget.addEventListener) {
		oTarget.addEventListener(sEventType, fnHandler, false);
	} else if (oTarget.attachEvent) {
		oTarget.attachEvent("on" + sEventType, fnHandler);
	} else {
		oTarget["on" + sEventType] = fnHandler;
	}
};
// 为对象注销事件
var removeEventHandler = function(oTarget, sEventType, fnHandler) {
    if (oTarget.removeEventListener) {
        oTarget.removeEventListener(sEventType, fnHandler, false);
    } else if (oTarget.detachEvent) {
        oTarget.detachEvent("on" + sEventType, fnHandler);
    } else { 
        oTarget["on" + sEventType] = null;
    }
};
var BindAsEventListener = function(object, fun) {
    return function(event) {
        return fun.call(object, (event || window.event));
    }
};
var Bind = function(object, fun) {
    return function() {
        return fun.apply(object, arguments);
    }
};
var ColorPalette = Class.create();
ColorPalette.prototype = {
	initialize : function(idContainer, idObj) {
		this.container = $(idContainer) || null;
		this.obj = $(idObj) || document.body;
		if (this.container == null) return;
		this.container.style.position = "relative";

		var outerLyr = '<div id="rOuterLyr" class="outerLyr"><div id="rDrag" class="drag"></div><div id="innerLyr" class="innerLyr"><div id="barLyr" class="barLyr"></div></div></div>';
		var outerLyr1 = '<div id="gOuterLyr" class="outerLyr1"><div id="gDrag" class="drag"></div><div id="innerLyr1" class="innerLyr"><div id="barLyr1" class="barLyr"></div></div></div>';
		var outerLyr2 = '<div id="bOuterLyr" class="outerLyr2"><div id="bDrag" class="drag"></div><div id="innerLyr2" class="innerLyr"><div id="barLyr2" class="barLyr"></div></div></div>';
		this.container.innerHTML = outerLyr + outerLyr1 + outerLyr2;

		var rDrag = $("rDrag"), gDrag = $("gDrag"), bDrag = $("bDrag");
		var rOuterLyr = $("rOuterLyr"), gOuterLyr = $("gOuterLyr"), bOuterLyr = $("bOuterLyr");

		this.fM = BindAsEventListener(this, this.move);
		this.fS = Bind(this, this.stop);

		// 计算并设置初始化时的颜色值
		var rVal = Math.round(rDrag.offsetTop * 255 / (rOuterLyr.offsetHeight - rDrag.offsetHeight));
		var gVal = Math.round(gDrag.offsetTop * 255 / (gOuterLyr.offsetHeight - gDrag.offsetHeight));
		var bVal = Math.round(bDrag.offsetTop * 255 / (bOuterLyr.offsetHeight - bDrag.offsetHeight));
		this.r = this.getHex(rVal);
		this.g = this.getHex(gVal);
		this.b = this.getHex(bVal);
		this.obj.style.backgroundColor = "#" + this.r + this.g + this.b;

		// 注册事件
		this.drag = rDrag;
		this.outerLyr = rOuterLyr;
		this.flag = 1; // 标记是修改r,g,b的值(1:r;2:g;3:b)
		var oThis = this;
		addEventHandler(rDrag, "mousedown", function(event) {oThis.drag = rDrag; oThis.outerLyr = rOuterLyr; oThis.flag = 1; oThis.start(event || window.event);});
		addEventHandler(gDrag, "mousedown", function(event) {oThis.drag = gDrag; oThis.outerLyr = gOuterLyr; oThis.flag = 2; oThis.start(event || window.event);});
		addEventHandler(bDrag, "mousedown", function(event) {oThis.drag = bDrag; oThis.outerLyr = bOuterLyr; oThis.flag = 3; oThis.start(event || window.event);});
	},
	start : function(oEvent) {
		this.y = this.drag.offsetTop;
		this.yPos = oEvent.clientY;
		this.dragHeight = this.drag.offsetHeight;
		this.outerLyrHeight = this.outerLyr.offsetHeight;
		addEventHandler(document, "mousemove", this.fM);
		addEventHandler(document, "mouseup", this.fS);		
	},
	move : function(oEvent) {
		var iDrag = this.drag, oldY = iDrag.style.pixelTop, iHeight = this.outerLyrHeight - this.dragHeight;
		var iPos = this.y + oEvent.clientY - this.yPos;
		if (iPos > oldY) {
			this.dir = -1; // 向下
		} else {
			this.dir = 1; // 向上
		}

		if (iPos <= 0 && this.dir == 1) {
			iDrag.style.pixelTop = 0;
			this.dir = 1;
		} else if (iPos >= iHeight && this.dir == -1) {
			iDrag.style.pixelTop = iHeight;
			this.dir = -1;
		} else {
			iDrag.style.pixelTop = iPos;
		}

		this.changeColor();
	},
	changeColor : function() {
		var curHeight = this.drag.style.pixelTop, totalHeight = this.outerLyrHeight - this.dragHeight;
		
		var value = Math.round((curHeight * 255) / totalHeight);
		if (this.flag == 1) {
			this.r = this.getHex(value);
		} else if (this.flag == 2) {
			this.g = this.getHex(value);
		} else if (this.flag == 3) {
			this.b = this.getHex(value);
		}
		this.obj.style.backgroundColor = "#" + this.r + this.g + this.b;
	},
	getHex : function(i) {
		if (i < 0) 
			return "00";
	    else if (i > 255) 
		    return "ff";
	    else { 
		    var str = "0" + i.toString(16); 
		    return str.substring(str.length - 2); 
		}
	},
	stop : function() {
		removeEventHandler(document, "mousemove", this.fM);
		removeEventHandler(document, "mouseup", this.fS);
	}
};
//-->
</script>

 

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