隐藏页面直到所有内容加载完毕

Question

I have a webpage which heavily makes use of jQuery.

My goal is to only show the page when everything is ready.

With that I want to avoid showing the annoying page rendering to the user.

I tried this so far ( #body_holder is a wrapper inside body ):

$(function(){
    $('#body_holder').hide();
});
$(window).load(function() {
    $("#body_holder").show();
});

This works completely fine, but messes up the layout.

The problem is that hiding the wrapper interferes with the other jQuery functions and plugins used (eg layout-plugin).

So I guess there must be another trick to do this. Maybe lay a picture or div over the body until window.load has occurred?

What approaches do you use?

EDIT:

The solution most likely has to be another way than display:none or hide() ;

Answer 1

Anything done with jQuery will normally have to wait for document.ready, which is too late IMHO.

Put a div on top, like so:

<div id="cover"></div>

set some styles:

#cover {position: fixed; height: 100%; width: 100%; top:0; left: 0; background: #000; z-index:9999;}

and hide it with JS when all elements are loaded:

$(window).on('load', function() {
   $("#cover").hide();
});

Or if for some reason your script uses even longer time then the DOM elements to load, set an interval to check the type of some function that loads the slowest, and remove the cover when all functions are defined!

 $(window).on('load', function() { $("#cover").fadeOut(200); }); //stackoverflow does not fire the window onload properly, substituted with fake load function newW() { $(window).load(); } setTimeout(newW, 1000); 

 #cover {position: fixed; height: 100%; width: 100%; top:0; left: 0; background: #000; z-index:9999; font-size: 60px; text-align: center; padding-top: 200px; color: #fff; } 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script> <ul> <li>This</li> <li>is</li> <li>a</li> <li>simple</li> <li>test</li> <li>of</li> <li>a</li> <li>cover</li> </ul> <div id="cover">LOADING</div> 

Answer 2

Here is a jQuery solution for those looking:

Hide the body with css then show it after the page is loaded:

CSS:

html { visibility:hidden; }

JavaScript

$(document).ready(function() {
  document.getElementsByTagName("html")[0].style.visibility = "visible";
});

The page will go from blank to showing all content when the page is loaded, no flash of content, no watching images load etc.

Answer 3

You should try setting visibility to hidden instead of display:none. Setting visibility to hidden will retain all elements positions and dimensions, thus it shouldn't create layout problems.

Answer 4

Stumbled upon this and tried @9ete's solution but it didn't help me. This worked instead:

CSS:

html { visibility:hidden; }

JS:

window.addEventListener('load', function () {
    document.getElementsByTagName("html")[0].style.visibility = "visible";
});

As per documentation for window , the load event is fired after all the content (images included) is loaded while $document says that ready is fired after only the DOM is ready.

Answer 5

Your question is valid, but I would not get in a practice of hiding or covering the page while things are spinning up.

It keeps the user from understanding what's happening on the page. While lots of things may need to load, different parts of the page should spring to life as they're loaded. You should get in the practice of locking controls that are not ready, perhaps displaying a spinner or some other progress indicator over them. Or setting the cursor to wait on loading items.

This keeps the user in the loop and allows him to see and interact with parts as they come online instead of obscuring all parts until everything is ready.

You will normally want to load the things the user needs the quickest access to, usually stuff above the fold, first. Loading is a prioritization that can easily be coordinated with Promises.

At the very least seeing the page allows the user to get his bearings and decide what to do. Be transparent.

Answer 6

I was seeking a non-javascript solution so I found one that is working on most browsers in acceptable manner.

Since the loading order of CSS rules matters;

• Define the hiding class in the first CSS file or inline in head.

.hidden-onpage-load{ display: none; } 

• In the body, the class can be used as

<div class="hidden-onpage-load"> ... </div>

• Redefine it inline or in a CSS file after all other CSS and JS files are loaded

.hidden-onpage-load{ display: block; } 

Answer 7

Start your HTML with:

<body style="opacity:0;">

At the end of your script:

document.body.style.opacity = 1;

Answer 8

The simplest solution I've come up with is to wrap the body in a as suggested previously, but set it as hidden from the get go, then use JQuery (or javascript) to unhide on load after all components are loaded.

 <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <div id="bodyDiv" hidden> Hello World! </div> <script> $(document).ready(function() { // add JQuery widget loads here $("#bodyDiv").show(); // reveal complete page }) </script> 

Answer 9

Don't forget, a lot of frameworks use javascript to structure a page. To prevent the page from showing before these modification have been made you'll need to do something like what is described here (eg run a script at the end of the page to show the real contents of the page):

Detect if any JavaScript function is running

Answer 10

If you have a div #bodyholder then you can put display:none in your CSS for it and then with jQuery do:

$(document).ready(function() {
     $('#body_holder').show();
});

I don't see why hiding a div should interfere with the loading of anything, because all it means is it is hidden. However, if you have lots of jQuery being used then make sure you wrap it in $(document).ready which will make sure that the DOM is fully loaded before the Javascript is executed

A further point is that HTML/CSS is designed for progressive loading, and if you do it properly then you can get a nice progressive loading of content for your users. I personally wouldn't want my users getting a white screen for a few seconds until everything was loaded. Move your Javascript to the end of the page so that it doesn't block loading and get content onto the screen as quickly as possible.