Pixel and percentage width divs side-by-side

I've found a lot of similar questions, and tried out several solutions (including some of the so-called "holy grail" CSS layouts), but they don't quite do what I need.

I have a containing div (a CSS containing block) with id right. Inside it on the left side, I want a fixed-width div (a splitter bar, but it doesn't matter what it's being used for; id splitpane); on the right, filling the rest of the space, another div (id right-box below).

I've tried making the two inner divs display: inline-block (with vertical-align: top), setting the left one to width: 3px, but then there's no way to set the right to have width 100% - 3px. I've also tried using the float: left/margin-left: -100%/margin-left: 3px trick, but it has the same problem: the 100% plus the 3px overflows the parent containing block and causes a scroll bar to pop up. (Of course, it's not the scroll bar per se that's the problem; I could use overflow: hidden to remove it, but then content on the right would be truncated.)

Currently I'm using width: 99.5% for the right div, but that's a terrible hack (and is subject to overflow depending on screen width). It looks a bit like this:

<div id="right"><div id="splitpane"></div><div id="right-box">
  ...
</div></div>

With CSS as follows (float version, but the inline-block version is similar):

#right {
  display: inline-block;
  vertical-align: top;
  height: 100%;
  width: 85%;  /* this is part of a larger div */
}
#right-box {
  width: 99.5%; /* stupid hack; actually want 100% - 3px for splitter */
  height: 100%;
}
#splitpane {
  float: left;
  width: 3px;
  height: 100%;
  background: white;
  border-left: solid gray 1px;
  border-right: solid gray 1px;
  cursor: e-resize;
}

Is it even possible to do this? This is for an internal app., so solutions only need to work in Firefox 3 (if they are specific to FF3, though, preferably it's because the solution is standards-compliant but other browsers aren't, not because it's using Firefox-only code).

This is possible. Because block level elements automatically expand to take up any remaining horizontal space, you can utilise a block level element next to an uncleared floated element with your desired width.

<style type="text/css">
    div {
        height: 100px;
    }
    #container {
        width: 100%;
    }
    #left {
        background: #FF0;
    }
    #splitpane {
        position: relative;
        float: right;
        background: #000;
        width: 3px;
    }
</style>

<div id="container">
    <div id="splitpane"></div>
    <div id="left"></div>
</div>

See http://jsfiddle.net/georeith/W4YMD/1/

DIVs are the wrong element type for this since they don't "talk" to each other. You can achieve this easily with a table:

<table style="width:200px">
<tr>
    <td id="splitpane" style="width: 3px">...</td>
    <td id="rightBox" style="width: 100%">...</td>
<tr>
</table>

The 100% will make the rightBox as wide as possible but within the limits of the table.

why you didn't use margin-left (since it was float layout) on right box?

so no need to create a splitter div...


#right{
width:200px; /*specify some width*/
}
#rightbox{
float:left;
margin-left: 3px; /*replace the splitter*/
/*margin: 0 3px; /*use this to give left & right splitter*/ */
}

yeah something like that, i hate empty div, it's not semantic and it's like putting a splitter on the "old" table way

If the div #right-box is only going to contain non-floated content it might be an idea to just put the content inside #right instead and let it wrap around the floated #splitpane.

来源：https://stackoverflow.com/questions/641861/pixel-and-percentage-width-divs-side-by-side

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