Always display Div code in the middle of the screen (css js)_javascript tips

1. Display in the middle; (Reference: sky100articles1790515)

Copy code Code As follows:

.ordersearchDivCss
{
position: absolute;
z-index: 100;
display: block;
background-color: #6ec1df;
}

Js code
Call:
// JScript file gets the object's function through the element id
function $(id)
{
return document.getElementById(id);
}

Copy code The code is as follows:

function sc1(DivId) {
var Div = $(DivId);
$(DivId).style.top = (document.documentElement.scrollTop ( document.documentElement.clientHeight - $(DivId).offsetHeight) / 2) "px";
$(DivId).style.left = (document.documentElement.scrollLeft (document.documentElement.clientWidth - $(DivId). offsetWidth) / 2) "px";
//alert($(DivId).style.top);
}

2. Always display in the middle, scroll When, add the following code in Js:

Copy code The code is as follows:

function scall() {
sc1("DivMain");
}
window.onscroll = scall;
window.onresize = scall;
window.onload = scall;