wbs_dragdrop.js

来自「这是从网上下载下来的一个计算程序」· JavaScript 代码 · 共 74 行

function $(d) {
	return document.getElementById(d);
}
function gs(d) {
	var t = $(d);
	if (t) {
		return t.style;
	} else {
		return null;
	}
}
function gs2(d, a) {
	if (d.currentStyle) {
		var curVal = d.currentStyle[a];
	} else {
		var curVal = document.defaultView.getComputedStyle(d, null)[a];
	}
	return curVal;
}
if (document.getElementById) {
	(function () {
		if (window.opera) {
			document.write("<input type='hidden' id='Q' value=' '>");
		}
		var n = 500;
		var dragok = false;
		var y, x, d, dy, dx;
		function move(e) {
			if (!e) {
				e = window.event;
			}
			if (dragok) {
				d.style.left = dx + e.clientX - x + "px";
				d.style.top = dy + e.clientY - y + "px";
				return false;
			}
		}
		function down(e) {
			if (!e) {
				e = window.event;
			}
			var temp = (typeof e.target != "undefined") ? e.target : e.srcElement;
			if (temp.tagName != "HTML" | "BODY" && temp.className != "Dialog") {
				temp = (typeof temp.parentNode != "undefined") ? temp.parentNode : temp.parentElement;
			}
			if ("TR" == temp.tagName) {
				temp = (typeof temp.parentNode != "undefined") ? temp.parentNode : temp.parentElement;
				temp = (typeof temp.parentNode != "undefined") ? temp.parentNode : temp.parentElement;
				temp = (typeof temp.parentNode != "undefined") ? temp.parentNode : temp.parentElement;
			}
			if (temp.className == "Dialog") {
				if (window.opera) {
					document.getElementById("Q").focus();
				}
				dragok = true;
				temp.style.zIndex = n++;
				d = temp;
				dx = parseInt(gs2(temp, "left")) | 0;
				dy = parseInt(gs2(temp, "top")) | 0;
				x = e.clientX;
				y = e.clientY;
				document.onmousemove = move;
				return false;
			}
		}
		function up() {
			dragok = false;
			document.onmousemove = null;
		}
		document.onmousedown = down;
		document.onmouseup = up;
	})();
}