css - Div with scrollbar inside div with position:fixed

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css - Div with scrollbar inside div with position:fixed

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

css - Div with scrollbar inside div with position:fixed

I have a div with position:fixed that is my container div for some menus. I've set it to top:0px, bottom:0px to always fill the viewport. Inside that div I want to have 2 other divs, the lower one of which contains lots of lines and has overflow:auto. I would expect that it would be contained within the container div, but if there are too many lines it simply expands outside the fixed div. Below is my code and a screenshot to clarify:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>MyPlan</title>
    <meta name="X-UA-COMPATIBLE" value="IE=8" />
    <style type="text/css">
        #outerfixed { position:fixed;  width:200px;  background-color:blue; padding:5px; top:0px; bottom:30px;}
        #innerstatic1 { width:100%; background-color:yellow; height:100px;}
        #innerstatic2 { overflow:auto; background-color:red; width:100%;}
    </style>
</head>
<body>
    <div id="outerfixed">
        <h3>OUTERFIXED</h3>
        <div id="innerstatic1">
            <h3>INNERSTATIC1</h3>
        </div>
        <div id="innerstatic2">
            <h3>INNERSTATIC2</h3>
            line<br />
                        ...lots of lines
            line<br />
        </div>
    </div>
</body>
</html>

alt text

Is there any way for me to do this? Again, I want #innerstatic2 to be properly contained within #outerfixed and get scrollbars if it gets bigger than the space it has inside #outerfixed.

I know there are some possibilites to hack around this by also fixing #innerstatic2, but I would really like it to be within the flow inside #outerfixed if possible, so that if I move #outerfixed somewhere, the inner element would come with it.

EDIT: I know I can set overflow:auto on the #outerfixed and get a scrollbar on the whole thing, but I specifically want a scrollbar just on #innerstatic2, it is a grid and I want to scroll just the grid.

Anyone? Possible?

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1 Answer

深蓝 · Answer 1 · 2021-10-23T18:38:53+0000

There's a two-step solution for this, but it comes at something of a cost:

Add overflow-y: scroll; to the css for #innerstatic2.
define a height (or max-height) for #innerstatic2, otherwise it won't overflow, it'll just keep increasing its height (the default for a div is height: auto).

Edited because I just can't stop myself, sometimes.

I've posted a demo on jsbin to show a jQuery implementation of this, which will calculate a height for you (it's not generalised, so it'll only work with your current html).

(function($) {
  $.fn.innerstaticHeight = function() {
        var heightOfOuterfixed = $('#outerfixed').height(),
        offset = $('#innerstatic2').offset(),
        topOfInnerstatic2 = offset.top,
        potentialHeight = heightOfOuterfixed - topOfInnerstatic2;

        $('#innerstatic2').css('height',potentialHeight);
  }
})(jQuery);

$(document).ready(
    function() {
        $('#innerstatic2').innerstaticHeight();
    }
);

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css - Div with scrollbar inside div with position:fixed

css - Div with scrollbar inside div with position:fixed

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