How to make div 100% page (not screen) height- How to make a div 100% of page (not screen) height?

2022 The global C++ And system software technology conference | 3 month 11-12 Japan · Shanghai Click to learn more 》>>>

problem ：

I'm trying to use CSS to create a 'greyed out' effect on my page while a loading box is displayed in the foreground while the application is working. I'm trying to use CSS Create a... On my page “ gray ” effect , At the same time, the loading box is displayed in the foreground when the application is running .I've done this by creating a 100% height/width, translucent black div which has its visibility toggled on/off via javascript. I created 100％ Height / Width , Translucent black div To achieve this , It passes through javascript open / Turn off its visibility .I thought this would be simple enough; I think it's very simple ;however, when the page content expands to the point that the screen scrolls, scrolling to the foot of the page reveals a portion which is not greyed out. however , When the page content expands to the point where the screen scrolls , Scrolling to the bottom of the page displays a section that is not grayed out .In other words, the 100% in the div's height seems to be applying to the browser viewport size, not the actual page size. let me put it another way ,div High 100％ Seems to work for browser viewport sizes , Instead of the actual page size .How can I make the div expand to cover the whole of the page's content? How to make div Expand to cover the entire page ？I've tried using JQuery .css('height', '100%') before toggling it's visibility on but this doesn't change anything. I've tried to use JQuery .css（'height','100％'） Before switching its visibility , But that hasn't changed anything .

This is the CSS of the div in question: There's a problem div Of CSS：

div.screenMask{    position: absolute;    left: 0px;    top: 0px;    width: 100%;    height: 100%;    z-index: 1000;    background-color: #000000;    opacity: 0.7;    filter: alpha(opacity=70);    visibility: hidden;}

Thanks. thank you .

---

Solution ：

Reference resources ： https://stackoom.com/en/question/4D5J