js 蒙版进度条（图片）

/********************
** js 蒙版进度条（图片）
** dingzh@jstrd.com
** 2009-12-03
*********************/

//禁止网页后退
window.history.forward(1); 
document.attachEvent("onkeydown",docKeyDown);
function docKeyDown() {
    //屏蔽退格删除键
    if (window.event.keyCode == 8) {
        if(window.event.srcElement.type != "text"
            && window.event.srcElement.type != "textarea"
            && window.event.srcElement.type != "password") {
                window.event.keyCode = 0x0;
                return false;
            } else if(window.event.srcElement.readOnly) {
                window.event.keyCode = 0x0;
                return false;
            }
    }
}


//加载进度条
var process_submit_doing = false;
try {
    window.attachEvent("onload",doBodyLoad);
    //document.attachEvent("onclick",doProcess);
    window.attachEvent("onbeforeunload",doWinLoad);
} catch(e) {   
    document.addEventListener("onclick",doProcess,false);
    window.addEventListener("onbeforeunload",doWinLoad,false);
}
//
function doBodyLoad() {
    var obj;
    var vInput=document.getElementsByTagName("INPUT"); 
    for(var i in vInput) { 
        obj=vInput[i]; 
        if(obj.type=="button" || obj.type=="submit") {
            obj.attachEvent("onclick",doProcess);
        }
    }
    vInput=document.getElementsByTagName("IMG");
    for(var i in vInput) { 
        obj=vInput[i];
        if(undefined != obj.alt) {
            obj.attachEvent("onclick",doProcess);
        }
    }
}
//
function doWinLoad() {
    process_submit_doing = true;
}
//
function doProcess() {
    //是否正在提交
    if(!process_submit_doing) {
        return;
    }
    //
    var showProcess = false;
    //捕获事件源
    var eventObj = event.srcElement;
    var btnvalue = "";
    if(eventObj.tagName=='INPUT') {
        btnvalue = eventObj.value;
    } else if(eventObj.tagName=='IMG') {
        if(null != eventObj.alt && "" != eventObj.alt) {
            btnvalue = eventObj.alt; 
        } else {
            btnvalue = eventObj.title;
        }
    }
    btnvalue = btnvalue.replace(/ */g,"").replace(/　*/g,"");
    //
    var my_array = new Array();
    my_array.unshift("提交", "确定", "保存", "暂存", "结账", "审核", "审批", "作废", "回退", "退回", "驳回",
                     "退单", "撤消", "导入", "受理", "办理", "处理", "查询", "入库", "入账", "出库", "出账");
    
    for (i = 0; i < my_array.length; i++) {
        if(new RegExp(my_array[i],"ig").test(btnvalue)) {
            showProcess = true;
            break;
        }
    }
    
    //alert(showProcess);
    //不显示进度条
    if(!showProcess) {
        return;
    }
    //
    createProcessBgDiv();
}


function nocontextmenu()
{
    event.cancelBubble = true
    event.returnValue = false;
    return false;
}
function norightclick()
{
    if (event.button == 2 || event.button == 3)
    {
        event.cancelBubble = true
        event.returnValue = false;
        return false;
    }
}

//页面蒙版
function createProcessBgDiv()
{
    var h=document.body.scrollHeight;
    var w=document.body.scrollWidth;
    var div=document.createElement("<div id='divProcessBg' style='position:absolute;visibility:visible;background:gray;filter:alpha(opacity=30);z-index:1000;left:0;top:0;"+w+"px;height:"+h+"px;'></div>");
    //div.appendChild(document.createTextNode("xxxxxxxxxxxxxxxxxxxx"));
    div.appendChild(document.createElement("<iframe src='javascript:false' style='position:absolute; visibility:inherit; top:0px; left:0px; "+w+"px;height:"+h+"px; z-index:-1; filter=\"progid:DXImageTransform.Microsoft.Alpha(style=0,opacity=0)\";'></iframe>"));
    document.body.appendChild(div);
    document.body.appendChild(document.createElement("<div style='position:absolute;z-index:1002;left:0;top:0;"+w+"px;height:"+h+"px;background:url(http://www.cnblogs.com/framework/sys-resources/images/process1.gif) no-repeat center center;'></div>"));
    
    //屏蔽鼠标右键
    document.oncontextmenu = nocontextmenu;  // for IE5+
    document.onmousedown = norightclick;  // for all others
}
/*function delProcessBgDiv()
{
    document.body.removeChild(document.getElementById("divProcessBg"));        
    document.onmousedown = null;
} */