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JS仿iGoogle自定义首页模块拖拽特效的方法

Posted in Javascript onFebruary 13, 2015

本文实例讲述了JS仿iGoogle自定义首页模块拖拽特效的方法。分享给大家供大家参考。具体实现方法如下：

<!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>JS仿iGoogle自定义首页模块拖拽效果</title>

    <script type="text/javascript">

        var Common = {

            getEvent: function() {//ie/ff

                if (document.all) {

                    return window.event;

                }

                func = getEvent.caller;

                while (func != null) {

                    var arg0 = func.arguments[0];

                    if (arg0) {

                        if ((arg0.constructor == Event || arg0.constructor == MouseEvent) || (typeof (arg0) == "object" && arg0.preventDefault && arg0.stopPropagation)) {

                            return arg0;

                        }

                    }

                    func = func.caller;

                }

                return null;

            },

            getMousePos: function(ev) {

                if (!ev) {

                    ev = this.getEvent();

                }

                if (ev.pageX || ev.pageY) {

                    return {

                        x: ev.pageX,

                        y: ev.pageY

                    };

                }
                if (document.documentElement && document.documentElement.scrollTop) {

                    return {

                        x: ev.clientX + document.documentElement.scrollLeft - document.documentElement.clientLeft,

                        y: ev.clientY + document.documentElement.scrollTop - document.documentElement.clientTop

                    };

                }

                else if (document.body) {

                    return {

                        x: ev.clientX + document.body.scrollLeft - document.body.clientLeft,

                        y: ev.clientY + document.body.scrollTop - document.body.clientTop

                    };

                }

            },

            getElementPos: function(el) {

                el = this.getItself(el);

                var _x = 0, _y = 0;

                do {

                    _x += el.offsetLeft;

                    _y += el.offsetTop;

                } while (el = el.offsetParent);

                return { x: _x, y: _y };

            },

            getItself: function(id) {

                return "string" == typeof id ? document.getElementById(id) : id;

            },

            getViewportSize: { w: (window.innerWidth) ? window.innerWidth : (document.documentElement && document.documentElement.clientWidth) ? document.documentElement.clientWidth : (document.body?document.body.offsetWidth:0), h: (window.innerHeight) ? window.innerHeight : (document.documentElement && document.documentElement.clientHeight) ? document.documentElement.clientHeight : (document.body ? document.body.offsetHeight : 0) },

            isIE: document.all ? true : false,

            setOuterHtml: function(obj, html) {

                var Objrange = document.createRange();

                obj.innerHTML = html;

                Objrange.selectNodeContents(obj);

                var frag = Objrange.extractContents();

                obj.parentNode.insertBefore(frag, obj);

                obj.parentNode.removeChild(obj);

            },

            firstChild: function(parentObj, tagName) {

                if (Common.isIE) {

                    return parentObj.firstChild;

                }

                else {

                    var arr = parentObj.getElementsByTagName(tagName);

                    return arr[0];

                }

            },

            lastChild: function(parentObj, tagName) {

                if (Common.isIE) {

                    return parentObj.lastChild;

                }

                else {

                    var arr = parentObj.getElementsByTagName(tagName);

                    return arr[arr.length - 1];

                }

            },

            setCookie: function(name, value) {

                document.cookie = name + "=" + value;

            },

            getCookie: function(name) {

                var strCookie = document.cookie;

                var arrCookie = strCookie.split("; ");

                for (var i = 0; i < arrCookie.length; i++) {

                    var arr = arrCookie[i].split("=");

                    if (!arr[1]) {

                        return "";

                    }

                    if (arr[0] == name) {

                        return arr[1];

                    }

                }

                return "";

            },

            delCookie: function(name) {

                var exp = new Date();

                exp.setTime(exp.getTime() - 1);

                var cval = this.getCookie(name);

                if (cval != null) document.cookie = name + "=" + cval + ";expires=" + exp.toGMTString();

            }

        }

        var Class = {

            create: function() {

                return function() { this.init.apply(this, arguments); }

            }

        }

        var Drag = Class.create();

        Drag.prototype = {

            init: function(titleBar, dragDiv, Options) {

                //设置点击是否透明，默认透明60%

                titleBar = Common.getItself(titleBar);

                dragDiv = Common.getItself(dragDiv);

                this.dragArea = { maxLeft: -9999, maxRight: 9999, maxTop: -9999, maxBottom: 9999 };

                if (Options) {

                    this.opacity = Options.opacity ? (isNaN(parseInt(Options.opacity)) ? 100 : parseInt(Options.opacity)) : 100;

                    if (Options.area) {

                        if (Options.area.left && !isNaN(parseInt(Options.area.left))) { this.dragArea.maxLeft = Options.area.left };

                        if (Options.area.right && !isNaN(parseInt(Options.area.right))) { this.dragArea.maxRight = Options.area.right };

                        if (Options.area.top && !isNaN(parseInt(Options.area.top))) { this.dragArea.maxTop = Options.area.top };

                        if (Options.area.bottom && !isNaN(parseInt(Options.area.bottom))) { this.dragArea.maxBottom = Options.area.bottom };

                    }

                }

                else {

                    this.opacity = 60;

                }

                this.originDragDiv = null;

                this.tmpX = 0;

                this.tmpY = 0;

                this.moveable = false;

                this.dragArray = [];
                var dragObj = this;

                var dragTbl = document.getElementById("dragTable");
                titleBar.onmousedown = function(e) {

                    var ev = e || window.event || Common.getEvent();

                    //只允许通过鼠标左键进行拖拽,IE鼠标左键为1 FireFox为0

                    if (Common.isIE && ev.button == 1 || !Common.isIE && ev.button == 0) {

                    }

                    else {

                        return false;

                    }
                    //处理特殊情况：在最上/下面MOVE时不碰到现有DIV的情况下，又回到起始拖拽的列最上/下方

                    var tmpColId;

                    for (c = 0; c < dragTbl.rows[0].cells.length; c++) {

                        for (k = 0; k < dragTbl.rows[0].cells[c].getElementsByTagName("DIV").length; k++) {

                            if (dragDiv.id == dragTbl.rows[0].cells[c].getElementsByTagName("DIV")[k].id) {

                                tmpColId = c;

                                break;

                            }

                        }

                    }

                    var tmpPosFirstChild = Common.getElementPos(Common.firstChild(dragTbl.rows[0].cells[tmpColId], "DIV"));

                    var tmpPosLastChild = Common.getElementPos(Common.lastChild(dragTbl.rows[0].cells[tmpColId], "DIV"));

                    var tmpObj = { colId: tmpColId, firstChildUp: tmpPosFirstChild.y, lastChildDown: tmpPosLastChild.y + Common.lastChild(dragTbl.rows[0].cells[tmpColId], "DIV").offsetHeight };
                    //保存当前可拖拽各容器的所在位置

          dragObj.dragArray = dragObj.RegDragsPos();
                    //插入虚线框

                    var dashedElement = document.createElement("div");

                    dashedElement.style.cssText = dragDiv.style.cssText;

                    dashedElement.style.border = " dashed 2px #aaa ";

                    dashedElement.style.marginBottom = "6px";

                    dashedElement.style.width = dragDiv.offsetWidth - 2 * parseInt(dashedElement.style.borderWidth) + "px"; //减去boderWidth使虚线框大小保持与dragDiv一致

         dashedElement.style.height = dragDiv.offsetHeight - 2 * parseInt(dashedElement.style.borderWidth) + "px"; //加上px 保证FF正确                    

          dashedElement.style.position = "relative";

                    if (dragDiv.nextSibling) {

                        dragDiv.parentNode.insertBefore(dashedElement, dragDiv.nextSibling);

                    }

                    else {

                        dragDiv.parentNode.appendChild(dashedElement);

                    }

                    //拖动时变为absolute

                    dragDiv.style.width = dragDiv.offsetWidth + "px";

                    dragDiv.style.position = "absolute";


                    dragObj.moveable = true;

                    dragDiv.style.zIndex = dragObj.GetZindex() + 1;
                    var downPos = Common.getMousePos(ev);

                    dragObj.tmpX = downPos.x - dragDiv.offsetLeft;

                    dragObj.tmpY = downPos.y - dragDiv.offsetTop;
                    if (Common.isIE) {

                        dragDiv.setCapture();

                    } else {

                        window.captureEvents(Event.mousemove);

                    }
                    dragObj.SetOpacity(dragDiv, dragObj.opacity);
                    //FireFox 去除容器内拖拽图片问题

                    if (ev.preventDefault) {

                        ev.preventDefault();

                        ev.stopPropagation();

                    }
                    document.onmousemove = function(e) {

                        if (dragObj.moveable) {

                            var ev = e || window.event || Common.getEvent();

                            //IE 去除容器内拖拽图片问题

                            if (document.all) //IE

                            {

                                ev.returnValue = false;

                            }
                            var movePos = Common.getMousePos(ev);

                            dragDiv.style.left = Math.max(Math.min(movePos.x - dragObj.tmpX, dragObj.dragArea.maxRight), dragObj.dragArea.maxLeft) + "px";

                            dragDiv.style.top = Math.max(Math.min(movePos.y - dragObj.tmpY, dragObj.dragArea.maxBottom), dragObj.dragArea.maxTop) + "px";
                            var targetDiv = null;

                            for (var k = 0; k < dragObj.dragArray.length; k++) {

                                if (dragDiv == dragObj.dragArray[i]) {

                                    continue;

                                }
                                if (movePos.x > dragObj.dragArray[k].PosLeft && movePos.x < dragObj.dragArray[k].PosLeft + dragObj.dragArray[k].PosWidth

                                    && movePos.y > dragObj.dragArray[k].PosTop && movePos.y < dragObj.dragArray[k].PosTop + dragObj.dragArray[k].PosHeight

                                ) {

                                    targetDiv = document.getElementById(dragObj.dragArray[k].DragId);

                                    if (movePos.y < dragObj.dragArray[k].PosTop + dragObj.dragArray[k].PosHeight / 2) {

                                        //往上移

                                        dashedElement.style.width = targetDiv.offsetWidth - 2 * parseInt(dashedElement.style.borderWidth) + "px";

                                        targetDiv.parentNode.insertBefore(dashedElement, targetDiv);

                                    }

                                    else {

                                        //往下移

                                        dashedElement.style.width = targetDiv.offsetWidth - 2 * parseInt(dashedElement.style.borderWidth) + "px";

                                        if (targetDiv.nextSibling) {

                                            targetDiv.parentNode.insertBefore(dashedElement, targetDiv.nextSibling);

                                        }

                                        else {

                                            targetDiv.parentNode.appendChild(dashedElement);

                                        }

                                    }

                                }

                            }

                            

                            for (j = 0; j < dragTbl.rows[0].cells.length; j++) {

                                var startLeft = Common.getElementPos(dragTbl.rows[0].cells[j]).x;

                                if (movePos.x > startLeft && movePos.x < startLeft + dragTbl.rows[0].cells[j].offsetWidth) {

                                    ///列无DIV

                                    if (dragTbl.rows[0].cells[j].getElementsByTagName("div").length == 0) {

                                        dashedElement.style.width = dragTbl.rows[0].cells[j].offsetWidth - 2 * parseInt(dashedElement.style.borderWidth) + "px";

                                        dragTbl.rows[0].cells[j].appendChild(dashedElement);

                                    }

                                    else {

                                        var posFirstChild = Common.getElementPos(Common.firstChild(dragTbl.rows[0].cells[j], "DIV"));

                                        var posLastChild = Common.getElementPos(Common.lastChild(dragTbl.rows[0].cells[j], "DIV"));

                                        //处理特殊情况：在最上/下面MOVE时不碰到现有DIV的情况下，又回到起始拖拽的列最上/下方

                                        var tmpUp, tmpDown;

                                        if (tmpObj.colId == j) {

                                            tmpUp = tmpObj.firstChildUp;

                                            tmpDown = tmpObj.lastChildDown;

                                        }

                                        else {

                                            tmpUp = posFirstChild.y;

                                            tmpDown = posLastChild.y + Common.lastChild(dragTbl.rows[0].cells[j], "DIV").offsetHeight;

                                        }
                                        if (movePos.y < tmpUp) {///从最上面插入虚线框

                                            dashedElement.style.width = Common.firstChild(dragTbl.rows[0].cells[j], "DIV").offsetWidth - 2 * parseInt(dashedElement.style.borderWidth) + "px";

                                            dragTbl.rows[0].cells[j].insertBefore(dashedElement, Common.firstChild(dragTbl.rows[0].cells[j], "DIV"));

                                        }

                                        else if (movePos.y > tmpDown) {///从最下面插入虚线框

                                            dashedElement.style.width = Common.lastChild(dragTbl.rows[0].cells[j], "DIV").offsetWidth - 2 * parseInt(dashedElement.style.borderWidth) + "px";

                                            dragTbl.rows[0].cells[j].appendChild(dashedElement);

                                        }
                                    }

                                }

                            }

                        }

                    };
                    document.onmouseup = function() {

                        if (dragObj.moveable) {

                            if (Common.isIE) {

                                dragDiv.releaseCapture();

                            }

                            else {

                                window.releaseEvents(dragDiv.mousemove);

                            }

                            dragObj.SetOpacity(dragDiv, 100);

                            dragObj.moveable = false;

                            dragObj.tmpX = 0;

                            dragObj.tmpY = 0;
                            //务必写在此IF内

                            dragDiv.style.left = "";

                            dragDiv.style.top = "";
                            dragDiv.style.width = "";

                            dragDiv.style.position = "";  

                            dashedElement.parentNode.insertBefore(dragDiv, dashedElement);

                            dashedElement.parentNode.removeChild(dashedElement);

                        }
                    };
                }

            },

            SetOpacity: function(dragDiv, n) {

                if (Common.isIE) {

                    dragDiv.filters.alpha.opacity = n;

                }

                else {

                    dragDiv.style.opacity = n / 100;

                }
            },

            GetZindex: function() {

                var maxZindex = 0;

                var divs = document.getElementsByTagName("div");

                for (z = 0; z < divs.length; z++) {

                    maxZindex = Math.max(maxZindex, divs[z].style.zIndex);

                }

                return maxZindex;

            },

            RegDragsPos: function() {

                var arrDragDivs = new Array();

                var dragTbl = document.getElementById("dragTable");

                var tmpDiv, tmpPos;

                for (i = 0; i < dragTbl.getElementsByTagName("div").length; i++) {

                    tmpDiv = dragTbl.getElementsByTagName("div")[i];

                    if (tmpDiv.className == "dragDiv") {

                        tmpPos = Common.getElementPos(tmpDiv);

                        arrDragDivs.push({ DragId: tmpDiv.id, PosLeft: tmpPos.x, PosTop: tmpPos.y, PosWidth: tmpDiv.offsetWidth, PosHeight: tmpDiv.offsetHeight });

                    }

                }

                return arrDragDivs;

            }

        }
        window.onload = function() {

            var dragTbl = document.getElementById("dragTable");

            if (Common.getCookie("configArr")) {

                var configArr = eval("(" + Common.getCookie("configArr") + ")");

                for (i = 0; i < dragTbl.rows[0].cells.length; i++) {

                    for (j = 0; j < configArr[i].length; j++) {

                        dragTbl.rows[0].cells[i].appendChild(document.getElementById(configArr[i][j]));

                    }

                }

            }

            new Drag("titleBar1", "dragDiv1");

            new Drag("titleBar2", "dragDiv2");

            new Drag("titleBar3", "dragDiv3");

            new Drag("titleBar4", "dragDiv4");

            new Drag("titleBar5", "dragDiv5");

        }
        window.onunload = function() {

            var dragTbl = document.getElementById("dragTable");

            var configArr = "";

            for (i = 0; i < dragTbl.rows[0].cells.length; i++) {

                var tmpStr = "";

                for (j = 0; j < dragTbl.rows[0].cells[i].getElementsByTagName("DIV").length; j++) {

                    tmpStr += (tmpStr == "" ? "" : ",") + "'" + dragTbl.rows[0].cells[i].getElementsByTagName("DIV")[j].id + "'";

                }

                configArr += (configArr == "" ? "" : ",") + "[" + tmpStr + "]";

            }

            //format like: [['dragDiv3','dragDiv5'],['dragDiv4','dragDiv1'],['dragDiv2']]

            Common.setCookie("configArr", "[" + configArr + "]");            

        }

    </script>

    <style type="text/css">

    .spanDiv{

    position:relative;

    width:5px;

    height:5px;

    }
    .dragDiv,.nodragDiv{

    position:relative;

    filter:alpha(opacity=100);

    opacity:1;

    margin-bottom:6px;

    background-color:#FFFFFF;

    }

    </style>

</head>

<body > 

<script type="text/javascript">
</script>   

    <table id="dragTable" cellpadding="3"  style=" border:solid 0px green;width:98%;">

        <tr>

            <td valign="top" style="width:30%">

                <div class="dragDiv" id="dragDiv1" >

                    <table cellpadding="0" cellspacing="0" border="1" style="width:100%;border-collapse:collapse; border-color:Blue">

                        <tr id="titleBar1"  style="height:22px; text-align:left; background-color:#547BC9;color:White; padding:3px;cursor:move;">

                            <th align="left" unselectable="on" >Title1</th>

                        </tr>

                        <tr style="height:130px;padding:3px;" align="left" valign="top" >

                            <td unselectable="on">这里的字比较长....我来了....中国....中国...外国.，看一下有没有溢出></td> 

                        </tr>

                    </table>

                </div>               

                <div class="dragDiv" id="dragDiv2">

                    <table cellpadding="0" cellspacing="0" border="1" style="width:100%;border-collapse:collapse; border-color:Blue">

                        <tr id="titleBar2" style="height:22px; text-align:left; background-color:#547BC9;color:White; padding:3px;cursor:move;">

                            <th align="left" unselectable="on" >Title2</th>

                        </tr>

                        <tr style="height:130px;padding:3px;" align="left" valign="top" >

                            <td unselectable="on">Content2...</td> 

                        </tr>

                    </table>

                </div>

            </td>

            <td valign="top" style="width:50%">

                <div class="dragDiv" id="dragDiv3">

                    <table cellpadding="0" cellspacing="0" border="1" style="width:100%;border-collapse:collapse; border-color:Blue">

                        <tr id="titleBar3" style="height:22px; text-align:left; background-color:#547BC9;color:White; padding:3px;cursor:move;">

                            <th align="left" unselectable="on" >Title3</th>

                        </tr>

                        <tr style="height:230px;padding:3px;" align="left" valign="top" >

                            <td unselectable="on">Content3...</td> 

                        </tr>

                    </table>

                </div>                

            </td>

            <td valign="top" style="width:20%">

                <div class="dragDiv" id="dragDiv4">

                    <table cellpadding="0" cellspacing="0" border="1" style="width:100%;border-collapse:collapse; border-color:Blue">

                        <tr id="titleBar4" style="height:22px; text-align:left; background-color:#547BC9;color:White; padding:3px;cursor:move;">

                            <th align="left" unselectable="on" >Title4</th>

                        </tr>

                        <tr style="height:130px;padding:3px;" align="left" valign="top" >

                            <td unselectable="on">Content4...</td> 

                        </tr>

                    </table>

                </div>

                <div class="dragDiv" id="dragDiv5">

                    <table cellpadding="0" cellspacing="0" border="1" style="width:100%;border-collapse:collapse; border-color:Blue">

                        <tr id="titleBar5" style="height:22px; text-align:left; background-color:#547BC9;color:White; padding:3px;cursor:move;">

                            <th align="left" unselectable="on" >Title5</th>

                        </tr>

                        <tr style="height:130px;padding:3px;" align="left" valign="top" >

                            <td unselectable="on">Content5...</td> 

                        </tr>

                    </table>

                </div>

            </td>

        </tr>    

    </table>

</body>

</html>
<br><br><hr> 收集于互联网，只为兴趣与学习交流，不作商业用途。</font></p>

希望本文所述对大家的javascript程序设计有所帮助。

JS仿iGoogle自定义首页模块拖拽特效的方法

- Author -

代码家园

声明：登载此文出于传递更多信息之目的，并不意味着赞同其观点或证实其描述。

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