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JGrid中拖动改变列宽的脚本原型

发布：dxy 字体：[增加减小] 类型：转载

JGrid 中，可以拖动改变列宽，简单的原理就是改变相应的 col 的 style.width 今天看到skybot 同学在问这个问题，就又把这个功能拿出来，单独实现了一下（有改进）

顺便，把我研究过的，如何隐藏、显示一列的方法也实现了一把。但是这个功能和 css border-collapse:collapse; 有冲突，详情见代码2

点击运行可以看到效果:

<!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>jgrid拖动改变表格宽度</title> 
<style type="text/css"> 
 
</style> 
</head> 
<body> 
<div> 
<table id="dataTable" border="1" cellpadding="0" cellspacing="0" style="table-layout:fixed;"> 
    <colgroup> 
        <col style="width:200px;" /> 
        <col style="width:100px;" /> 
        <col style="width:100px;" /> 
        <col style="width:100px;" /> 
        <col style="width:100px;" /> 
    </colgroup> 
    <tr> 
        <td>拖动我1</td> 
        <td>拖动我2</td> 
        <td>拖动我3</td> 
        <td>拖动我4</td> 
        <td>拖动我5</td> 
    </tr> 
    <tr> 
        <td> </td> 
        <td> </td> 
        <td> </td> 
        <td> </td> 
        <td> </td> 
    </tr> 
    <tr> 
        <td> </td> 
        <td> </td> 
        <td> </td> 
        <td> </td> 
        <td> </td> 
    </tr> 
    <tr> 
        <td> </td> 
        <td> </td> 
        <td> </td> 
        <td> </td> 
        <td> </td> 
    </tr> 
    <tr> 
        <td> </td> 
        <td> </td> 
        <td> </td> 
        <td> </td> 
        <td> </td> 
    </tr> 
    <tr> 
        <td> </td> 
        <td> </td> 
        <td> </td> 
        <td> </td> 
        <td> </td> 
    </tr> 
</table> 
</div> 
<script language="javascript" type="text/javascript"> 
var JPos = {}; 
(function($){ 
     
    $.getAbsPos = function(pTarget){ 
        var x_ = y_ = 0; 
         
        if(pTarget.style.position != "absolute"){         
            while(pTarget.offsetParent){ 
                    x_ += pTarget.offsetLeft; 
                    y_ += pTarget.offsetTop; 
                    pTarget = pTarget.offsetParent; 
            } 
        } 
            x_ += pTarget.offsetLeft; 
            y_ += pTarget.offsetTop; 
        return {x:x_,y:y_}; 
    } 
     
    $.getEventPos = function(evt){ 
            var _x,_y; 
            evt = JEvent.getEvent(evt); 
            if(evt.pageX || evt.pageY){ 
                _x = evt.pageX; 
                _y = evt.pageY; 
            }else if(evt.clientX || evt.clientY){ 
                _x = evt.clientX + (document.body.scrollLeft || document.documentElement.scrollLeft) - (document.body.clientLeft || document.documentElement.clientLeft); 
                _y = evt.clientY + (document.body.scrollTop || document.documentElement.scrollTop) - (document.body.clientTop || document.documentElement.clientTop); 
            }else{ 
                return $.getAbsPos(evt.target);     
            } 
            return {x:_x,y:_y};     
    }     
     
})(JPos); 
//======================================================================================= 
var JEvent = {}; 
(function($){ 
    $.getEvent = function(evt){               
        evt = window.event || evt; 
                     
        if(!evt){ 
            var fun = JEvent.getEvent.caller; 
            while(fun != null){ 
                evt = fun.arguments[0]; 
                if(evt && evt.constructor == Event) 
                    break; 
                fun = fun.caller; 
            } 
        } 
             
        return evt; 
    } 
     
    $.doEvent = function(fun){ 
        var args = arguments; 
        return function(){ 
            return fun(args); 
        } 
    } 
})(JEvent); 
//======================================================================================= 
var colIndex; 
var dataTable = document.getElementById("dataTable"); 
var cols = dataTable.getElementsByTagName("COL"); 
var dragMask = document.createElement("DIV"); 
var mAWidth = mAHeight = 300; 
document.body.insertBefore(dragMask,document.body.lastChild); 
dragMask.style.cssText = "width:" + mAWidth + "px;height:" + mAHeight + "px;position:absolute;background-color:#000;filter: Alpha(Opacity=10);-moz-opacity:0.1;opacity: 0.1;display:none;z-index:999999999;display:none;"; 
var mask_mousemove = function(evt){ 
    if(document.selection){//IE ,Opera 
        if(document.selection.empty) 
            document.selection.empty();//IE 
        else{//Opera 
            document.selection = null; 
        } 
    }else if(window.getSelection){//FF,Safari 
        window.getSelection().removeAllRanges(); 
    } 
     
    var oPos = JPos.getAbsPos(this); 
    var mPos = JPos.getEventPos(evt); 
     
    var x = mPos.x - oPos.x - mAWidth / 2; 
    var tmpX = parseInt(cols[colIndex].style.width) + x; 
    dragMask.style.left = mPos.x - mAWidth / 2 + "px"; 
    cols[colIndex].style.width = tmpX >= 2 ? tmpX + "px" : "2px"; 
    if(!document.all) 
        dataTable.parentNode.style.width = dataTable.parentNode.clientWidth + x + "px";//这一句为处理FF时用。 
} 
var mask_mouseup = function(evt){ 
    dragMask.style.display = "none"; 
} 
dragMask.onmousemove = mask_mousemove; 
dragMask.onmouseup = mask_mouseup; 
var cell_mousedown = function(evt){ 
    colIndex = this.colIndex; 
    var mPos = JPos.getEventPos(evt); 
    with(dragMask.style){ 
        left = mPos.x - mAWidth / 2  + "px"; 
        top = mPos.y - mAHeight / 2 + "px"; 
        display = ""; 
    } 
} 
var chk_click = function(evt){ 
    var obj = cols[this.colIndex]; 
    if(this.checked){ 
        obj.style.cssText = obj.css_ ? obj.css_ : "width:100px;"; 
    }else{ 
        obj.css_ = obj.style.cssText; 
        obj.style.cssText = document.all ? "display:none" : "visibility: collapse;overflow:hidden;width:0px;"; 
    } 
} 
var i , o; 
var label ,chk; 
for(i = 0 ; o = dataTable.rows[0].cells[i] ; i++){ 
    o.colIndex = i; 
    o.onmousedown = cell_mousedown; 
     
    label = document.createElement("LABEL"); 
    document.body.insertBefore(label,document.body.lastChild); 
    chk = document.createElement("INPUT"); 
    chk.type = "checkbox"; 
    label.appendChild(chk); 
    chk.onclick = chk_click; 
    chk.colIndex = i; 
    chk.checked = "checked"; 
    label.appendChild(document.createTextNode(o.innerHTML)); 
} 
</script> 
</body> 
</html>

[Ctrl+A 全选提示:你可先修改部分代码,再按运行]

修改版2

点击运行可以看到效果:

<!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>jgrid拖动改变表格宽度_修改版</title> 
<style type="text/css"> 
 
</style> 
</head> 
<body> 
<div> 
<table id="dataTable" border="1" cellpadding="0" cellspacing="0" style="table-layout:fixed;border-collapse:collapse;"> 
    <colgroup> 
        <col style="width:200px;" /> 
        <col style="width:100px;" /> 
        <col style="width:100px;" /> 
        <col style="width:100px;" /> 
        <col style="width:100px;" /> 
    </colgroup> 
    <tr> 
        <td>拖动我1</td> 
        <td>拖动我2</td> 
        <td>拖动我3</td> 
        <td>拖动我4</td> 
        <td>拖动我5</td> 
    </tr> 
    <tr> 
        <td> </td> 
        <td> </td> 
        <td> </td> 
        <td> </td> 
        <td> </td> 
    </tr> 
    <tr> 
        <td> </td> 
        <td> </td> 
        <td> </td> 
        <td> </td> 
        <td> </td> 
    </tr> 
    <tr> 
        <td> </td> 
        <td> </td> 
        <td> </td> 
        <td> </td> 
        <td> </td> 
    </tr> 
    <tr> 
        <td> </td> 
        <td> </td> 
        <td> </td> 
        <td> </td> 
        <td> </td> 
    </tr> 
    <tr> 
        <td> </td> 
        <td> </td> 
        <td> </td> 
        <td> </td> 
        <td> </td> 
    </tr> 
</table> 
</div> 
<script language="javascript" type="text/javascript"> 
var JPos = {}; 
(function($){ 
     
    $.getAbsPos = function(pTarget){ 
        var x_ = y_ = 0; 
         
        if(pTarget.style.position != "absolute"){         
            while(pTarget.offsetParent){ 
                    x_ += pTarget.offsetLeft; 
                    y_ += pTarget.offsetTop; 
                    pTarget = pTarget.offsetParent; 
            } 
        } 
            x_ += pTarget.offsetLeft; 
            y_ += pTarget.offsetTop; 
        return {x:x_,y:y_}; 
    } 
     
    $.getEventPos = function(evt){ 
            var _x,_y; 
            evt = JEvent.getEvent(evt); 
            if(evt.pageX || evt.pageY){ 
                _x = evt.pageX; 
                _y = evt.pageY; 
            }else if(evt.clientX || evt.clientY){ 
                _x = evt.clientX + (document.body.scrollLeft || document.documentElement.scrollLeft) - (document.body.clientLeft || document.documentElement.clientLeft); 
                _y = evt.clientY + (document.body.scrollTop || document.documentElement.scrollTop) - (document.body.clientTop || document.documentElement.clientTop); 
            }else{ 
                return $.getAbsPos(evt.target);     
            } 
            return {x:_x,y:_y};     
    }     
     
})(JPos); 
//======================================================================================= 
var JEvent = {}; 
(function($){ 
    $.getEvent = function(evt){               
        evt = window.event || evt; 
                     
        if(!evt){ 
            var fun = JEvent.getEvent.caller; 
            while(fun != null){ 
                evt = fun.arguments[0]; 
                if(evt && evt.constructor == Event) 
                    break; 
                fun = fun.caller; 
            } 
        } 
             
        return evt; 
    } 
     
    $.doEvent = function(fun){ 
        var args = arguments; 
        return function(){ 
            return fun(args); 
        } 
    } 
})(JEvent); 
//======================================================================================= 
var colIndex; 
var dataTable = document.getElementById("dataTable"); 
var cols = dataTable.getElementsByTagName("COL"); 
var dragMask = document.createElement("DIV"); 
var mAWidth = mAHeight = 300; 
document.body.insertBefore(dragMask,document.body.lastChild); 
dragMask.style.cssText = "width:" + mAWidth + "px;height:" + mAHeight + "px;position:absolute;background-color:#000;filter: Alpha(Opacity=10);-moz-opacity:0.1;opacity: 0.1;display:none;z-index:999999999;display:none;"; 
var mask_mousemove = function(evt){ 
    if(document.selection){//IE ,Opera 
        if(document.selection.empty) 
            document.selection.empty();//IE 
        else{//Opera 
            document.selection = null; 
        } 
    }else if(window.getSelection){//FF,Safari 
        window.getSelection().removeAllRanges(); 
    } 
     
    var oPos = JPos.getAbsPos(this); 
    var mPos = JPos.getEventPos(evt); 
     
    var x = mPos.x - oPos.x - mAWidth / 2; 
    var tmpX = parseInt(cols[colIndex].style.width) + x; 
    dragMask.style.left = mPos.x - mAWidth / 2 + "px"; 
    cols[colIndex].style.width = tmpX >= 2 ? tmpX + "px" : "2px"; 
    if(!document.all) 
        dataTable.parentNode.style.width = dataTable.parentNode.clientWidth + x + "px";//这一句为处理FF时用。 
} 
var mask_mouseup = function(evt){ 
    dragMask.style.display = "none"; 
} 
dragMask.onmousemove = mask_mousemove; 
dragMask.onmouseup = mask_mouseup; 
var cell_mousedown = function(evt){ 
    colIndex = this.colIndex; 
    var mPos = JPos.getEventPos(evt); 
    with(dragMask.style){ 
        left = mPos.x - mAWidth / 2  + "px"; 
        top = mPos.y - mAHeight / 2 + "px"; 
        display = ""; 
    } 
} 
var chk_click = function(evt){ 
    var obj = cols[this.colIndex]; 
    if(this.checked){ 
        obj.style.cssText = obj.css_ ? obj.css_ : "width:100px;"; 
    }else{ 
        obj.css_ = obj.style.cssText; 
        obj.style.cssText = document.all ? "display:none" : "visibility: collapse;overflow:hidden;width:0px;"; 
    } 
} 
var i , o; 
var label ,chk; 
for(i = 0 ; o = dataTable.rows[0].cells[i] ; i++){ 
    o.colIndex = i; 
    o.onmousedown = cell_mousedown; 
     
    label = document.createElement("LABEL"); 
    document.body.insertBefore(label,document.body.lastChild); 
    chk = document.createElement("INPUT"); 
    chk.type = "checkbox"; 
    label.appendChild(chk); 
    chk.onclick = chk_click; 
    chk.colIndex = i; 
    chk.checked = "checked"; 
    label.appendChild(document.createTextNode(o.innerHTML)); 
} 
</script> 
</body> 
</html>

[Ctrl+A 全选提示:你可先修改部分代码,再按运行]

ff下拖动时一大块影子是怎么产生的呢
是故意显示出来的。
把 -moz-opacity:0.1;opacity: 0.1 改掉。

Tags：JGrid 拖动

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