How to push an element outside the screen without the browser just expanding the viewport?

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Some times it\'s nice to be able to slide things out of the viewport to hide them, for example when making hide-able sidebars or panels. But when I push something past the r

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难免孤独

2020-12-24 15:11

The best way I've found to solving this issue is to place the element inside an invisible wrapper of the same size. The wrapper should have overflow: hidden and the element should be pushed outside the edge of the wrapper instead of outside the edge of <body>.

The trick of this solution is that nothing actually leaves the screen, so the browser doesn't try to increase the viewport size to compensate. Instead the wrapper rests on the edge of the screen and the sidebar is inside it. Think of the wrapper as an opacity map.

The wrapper also has to be resized down to 0 so that it won't lay invisible on top of the document and possibly grab clicks that wasn't meant for it.

Here's an example of the solution in practice. I've used jQuery to manipulate the CSS, but any JavaScript library (or none) will do the trick. Notice that the "clicker" div wouldn't be clickable unless the sidebar wrapper is scaled down.

$('.sidebar-inner').on('click', function() {
    $(this).css('right', -250);
    $(this).closest('.sidebar-outer').css('width', 0);
});

$('.clicker').on('click', function() {
    alert('CLICKED!');
});

body
{
    background-color: red;
    font: 12pt sans-serif;
}

.sidebar-outer
{
    position: absolute;
    top: 0px;
    right: 0px;
    bottom: 0px;
    width: 250px;
    
    -webkit-transition: width 0.2s ease-out;
    -moz-transition: width 0.2s ease-out;
    transition: width 0.2s ease-out;
    
    overflow: hidden;
    z-index: 999;
}

.sidebar-inner
{
    position: absolute;
    top: 0px;
    right: 0px;
    bottom: 0px;
    width: 250px;
    padding: 10px;
    box-sizing: border-box;
    
    -webkit-transition: right 0.2s ease-out;
    -moz-transition: right 0.2s ease-out;
    transition: right 0.2s ease-out;
    
    background-color: cornflowerblue;
    cursor: pointer;
}

.clicker
{
    position: absolute;
    width: 50px;
    height: 50px;
    top: 10px;
    right: 10px;
    padding: 10px;
    
    background-color: green;
    cursor: pointer;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<div class="sidebar-outer">
    <div class="sidebar-inner">
        Click to hide
    </div>
</div>

<div class="clicker">Click me!!</div>

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执念已碎

2020-12-24 15:29

A simple solution (admittedly not always viable) would be to set position:fixed on the sidebar instead of position:absolute.

FIDDLE

$('.sidebar').on('click', function() {
  $(this).css('right', -250);
});

.sidebar {
  position: fixed;
  top: 0px;
  right: 0px;
  bottom: 0px;
  width: 250px;
  -webkit-transition: right 0.2s ease-out;
  -moz-transition: right 0.2s ease-out;
  transition: right 0.2s ease-out;
  cursor: pointer;
  background-color: cornflowerblue;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="sidebar">
  Click to hide
</div>

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独厮守ぢ

2020-12-24 15:29

That is a bad idea to wrap something invisible, because you should know why your will move it outside screen, it is not just for hidden, if just for hidden there will be a lot of good ways to do. To move outside the screen, the most benefit is when you deal with large picture,video,or other component like News Feed in iframe. That will cache render for it, make significante effective improvement.

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