拒绝session丢失利用DIV层实现对模态窗口的模拟 _showmodaldialog源码div实现-优快云博客

本文链接：https://blog.youkuaiyun.com/tourstar/article/details/5824072

使用window.showModalDialog进行信息的提示，相当方便，也容易控制外观和布局。但是存在一个严重的问题，就是Session丢失。当在A页面进行showModalDialog时，弹出的模态窗口open新页面或new dialog()时，会得不到A页面中的Session，这样就严重地限制了他的使用范围。

进一步的使用模式窗口可以发现session的丢失总是便随页面的刷新
1.在普通页面中弹出模式窗口且进行new dialog()操作时会造成该进程中所有页面session的丢失

2.在模式窗口嵌套使用时弹出的模式窗口并不会使父模式窗口的session丢失但是会取不到父模式窗口的值

3.在弹出的模式窗口中使用js脚本需要验证表单时如果出现return true or false之类的语句，会造成模态窗口session的丢失。

用showModalDialog经常出现这样那样奇怪的问题，因此最好少用showModalDialog。替代的方法就是用DIV来模拟实现模式窗口相同的功能。

html代码如下

</ td >

</ tr >

</ table >

</ div >

< div id ="id1" > 这里是弹出层后的背景可以不放内容 </ div >

在Css中设置弹出窗口的颜色背景透明度等

#id1 {width:100%;height:100%;background-color:#000;position:absolute;top:0;left:0;z-index:49;display:none; filter:progid:DXImageTransform.Microsoft.Alpha(opacity=25);

}

#id2 {top:200px;position:absolute;z-index:50;display:none;border:3px solid #E5E5E5; left:100px;background-color:white;}

js代码如下可以对层进行拖拽随意进行移动

function divshow(showmsg) { //弹出窗口

document.getElementById("id1").style.height=window.screen.height+"px";

document.getElementById("id1").style.width=window.screen.width+"px";

document.getElementById("id1").style.display='block';

document.getElementById("id2").style.display='block';

document.getElementById("ShowMSG").innerText = showmsg;

}

function divhide() { //隐藏窗口

document.getElementById("id1").style.display='none'

document.getElementById("id2").style.display='none'

}

self.onError = null ;

currentX = currentY = 0 ;

whichIt = null ;

lastScrollX = 0 ; lastScrollY = 0 ;

NS = (document.layers) ? 1 : 0 ;

IE = (document.all) ? 1 : 0 ;

function heartBeat() {

if(IE) { diffY = document.body.scrollTop; diffX = document.body.scrollLeft; }

if(NS) { diffY = self.pageYOffset; diffX = self.pageXOffset; }

if(diffY != lastScrollY) {

percent = .1 * (diffY - lastScrollY);

if(percent > 0) percent = Math.ceil(percent);

else percent = Math.floor(percent);

if(IE) document.all.id2.style.pixelTop += percent;

if(NS) document.id2.top += percent;

lastScrollY = lastScrollY + percent;

}

if(diffX != lastScrollX) {

percent = .1 * (diffX - lastScrollX);

if(percent > 0) percent = Math.ceil(percent);

else percent = Math.floor(percent);

if(IE) document.all.id2.style.pixelLeft += percent;

if(NS) document.id2.left += percent;

lastScrollX = lastScrollX + percent;

}

function checkFocus(x,y) {

stalkerx = document.id2.pageX;

stalkery = document.id2.pageY;

stalkerwidth = document.id2.clip.width;

stalkerheight = document.id2.clip.height;

if( (x > stalkerx && x < (stalkerx+stalkerwidth)) && (y > stalkery && y < (stalkery+stalkerheight))) return true;

else return false;

}

function grabIt(e) {

if(IE) {

whichIt = event.srcElement;

while (whichIt.id.indexOf("id2") == -1) {

whichIt = whichIt.parentElement;

if (whichIt == null) { return true; }

}

whichIt.style.pixelLeft = whichIt.offsetLeft;

whichIt.style.pixelTop = whichIt.offsetTop;

currentX = (event.clientX + document.body.scrollLeft);

currentY = (event.clientY + document.body.scrollTop);

} else {

window.captureEvents(Event.MOUSEMOVE);

if(checkFocus (e.pageX,e.pageY)) {

whichIt = document.id2;

stalkerTouchedX = e.pageX-document.id2.pageX;

StalkerTouchedY = e.pageY-document.id2.pageY;

}

return true;

}

function moveIt(e) {

if (whichIt == null) { return false; }

if(IE) {

newX = (event.clientX + document.body.scrollLeft);

newY = (event.clientY + document.body.scrollTop);

distanceX = (newX - currentX); distanceY = (newY - currentY);

currentX = newX; currentY = newY;

whichIt.style.pixelLeft += distanceX;

whichIt.style.pixelTop += distanceY;

if(whichIt.style.pixelTop < document.body.scrollTop) whichIt.style.pixelTop = document.body.scrollTop;

if(whichIt.style.pixelLeft < document.body.scrollLeft) whichIt.style.pixelLeft = document.body.scrollLeft; if(whichIt.style.pixelLeft > document.body.offsetWidth - document.body.scrollLeft - whichIt.style.pixelWidth - 20) whichIt.style.pixelLeft = document.body.offsetWidth - whichIt.style.pixelWidth - 20;

if(whichIt.style.pixelTop > document.body.offsetHeight + document.body.scrollTop - whichIt.style.pixelHeight - 5) whichIt.style.pixelTop = document.body.offsetHeight + document.body.scrollTop - whichIt.style.pixelHeight - 5;

event.returnValue = false;

} else {

whichIt.moveTo(e.pageX-StalkerTouchedX,e.pageY-StalkerTouchedY);

if(whichIt.left < 0+self.pageXOffset) whichIt.left = 0+self.pageXOffset;

if(whichIt.top < 0+self.pageYOffset) whichIt.top = 0+self.pageYOffset;

if( (whichIt.left + whichIt.clip.width) >= (window.innerWidth+self.pageXOffset-17)) whichIt.left = ((window.innerWidth+self.pageXOffset)-whichIt.clip.width)-17;

if( (whichIt.top + whichIt.clip.height) >= (window.innerHeight+self.pageYOffset-17)) whichIt.top = ((window.innerHeight+self.pageYOffset)-whichIt.clip.height)-17;

return false;}

return false;

}

function dropIt() {

whichIt = null;

if(NS) window.releaseEvents (Event.MOUSEMOVE);

return true;

}

if (NS) {

window.captureEvents(Event.MOUSEUP|Event.MOUSEDOWN);

window.onmousedown = grabIt;