JS method to implement div pop-up layer

This article describes the method of implementing the div pop-up layer by js. Share it for your reference. The specific analysis is as follows:

By the way, it is really easy to implement pop-up layers when various plug-ins are released. However, I sometimes think that those plug-ins are not practical and often find some pure JS original things. Let me share with you a native js div pop-up layer instance. Friends in need can take a look.

Needless to say, just post the code. There are codes and comments:

Copy the code as follows:/*

* Pop up the DIV layer

*/

function showDiv()

{

var Idiv = document.getElementById("Idiv");

var mou_head = document.getElementById('mou_head');

Idiv.style.display = "block";

//The following parts should be centered to display the pop-up layer

Idiv.style.left=(document.documentElement.clientWidth-Idiv.clientWidth)/2+document.documentElement.scrollLeft+"px";

Idiv.style.top =(document.documentElement.clientHeight-Idiv.clientHeight)/2+document.documentElement.scrollTop-50+"px";

//The following parts make the entire page gray-out-clickable

var procbg = document.createElement("div"); // Create a div first

procbg.setAttribute("id","mybg"); //Define the id of the div

procbg.style.background = "#000000";

procbg.style.width = "100%";

procbg.style.height = "100%";

procbg.style.position = "fixed";

procbg.style.top = "0";

procbg.style.left = "0";

procbg.style.zIndex = "500";

procbg.style.opacity = "0.6";

procbg.style.filter = "Alpha(opacity=70)";

//Add the background layer to the page

document.body.appendChild(procbg);

document.body.style.overflow = "hidden"; //Cancel scrollbar

//The following parts realize the drag effect of the pop-up layer

var posX;

var posY;

mou_head.onmousedown=function(e)

{

if(!e) e = window.event; //IE

posX = e.clientX - parseInt(Idiv.style.left);

posY = e.clientY - parseInt(Idiv.style.top);

document.onmousemove = mousemove;

}

document.onmouseup = function()

{

document.onmousemove = null;

}

function mousemove(ev)

{

if(ev==null) ev = window.event;//IE

Idiv.style.left = (ev.clientX - posX) + "px";

Idiv.style.top = (ev.clientY - posY) + "px";

}

}

function closeDiv() //Close the pop-up layer

{

var Idiv=document.getElementById("Idiv");

Idiv.style.display="none";

document.body.style.overflow = "auto"; //Restore page scrollbar

var body = document.getElementsByTagName("body");

var mybg = document.getElementById("mybg");

body[0].removeChild(mybg);

}

<!--Pop layer starts->

<div id="Idiv" style="display:none; position:absolute; z-index:1000; background:#67a3d9;">

<div id="mou_head"100px; height=10px;z-index:1001; position:absolute;">This is used to implement drag layers</div>

<input type="button" value="close" onclick="closeDiv();" />

</div>

<!--End->

As for some beautification effects, you can modify them yourself.

I hope this article will be helpful to everyone's JavaScript programming.