Igor's Blog

Not long ago I wrote about Mobile Safari scrolling problem with an input field inside a fixed DIV and provided a solution that used a small amount of CSS to make the scrolling issue go away. This worked really well until I discovered that by setting overflow to auto caused the 'scroll' event to never fire. I rely on the scroll event firing so that I can dynamically load more data into a page, so this forced me into finding a better solution and here it is.

To reiterate the problem below is a video that shows how the background page jumps to the top whenever an input field gets focus (the field appears in a fixed position DIV)...

safarifixeddivissue2.png


My solution depends on having two main fixed position DIVs. The first one is the page 'header', the second is the page 'body wrapper'. These together take up 100% of the page height. Inside the 'header' is another DIV that holds all of the popup DIVs that I wish to display (not visible initially). The 'body wrapper' DIV is another fixed position DIV that is simply offset from the top by the value equal to the height of the 'header' DIV. This DIV has it's overflow-y set to 'scroll' so the scroll event can be captured. Inside the 'body wrapper' DIV is another DIV that contains the actual content of the page.

Now when I display a popup, since it's inside the header which is always visible, the 'body wrapper' isn't affected. Perfect!

Here's the HTML...
 HTML
<body>
<div class="tb_header">
...header content...
<div class="tb_popup_holder">
...popup divs...
</div>
</div>
<div class="tb_body_wrapper">
<div class="tb_body">
...body content...
</div>
</div>
</body>




...and the CSS (leaving out any extra styling)...
 CSS
html, body {
margin: 0 0;
height: 100%;
width: 100%;
}
.tb_header {
width: 100%;
height: 40px;
position: fixed;
left: 0;
top: 0;
}
.tb_body_wrapper {
padding-bottom: 40px;
height: 100%;
width: 100%;
position: fixed;
left: 0;
top: 40px;
overflow-y: scroll;
}
.tb_body {
width: 100%;
display: inline-block;
}


The 'body wrapper' has a 40px padding at the bottom so that any content that goes to the end of the page isn't cut off due to the 40px header.

Now I can listen to the scroll event on the 'body wrapper' like so:
 JavaScript
$('.tb_body_wrapper').scroll(function() {
// handle scroll
})


-i

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About — I'm an enthusiastic software engineer and consultant interested in many fields including J2EE, programming, electronics, 3D printing, video games, wood working and gardening.
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