javascript - Determine the Width of a dynamic CSS3 Multicolumn DIV width fixed column-width

Question

I have a DIV container filled with a dynamic text. The length of the text can be different. The DIV container has a fixed height but no width.

The Text is formatted as CSS3 Multicolumn Text width a fixed columns-width.

The result is n columns with the width of column-width. Now i want to know either how many columns are there or how is the computed width of the DIV.

CSS CODE:

.columnize{
    float: left;
    position: relative;
    width: 840px;
    overflow: hidden;
}
.columnize div{
    -moz-column-width: 259px;
    -webkit-column-width: 259px;
    -moz-column-gap: 16px;
    -webkit-column-gap: 16px;
    height: 560px;
}

HTML CODE:

<div id="columnWrapper class="columnize">
    <div id="content">
    ... content goes here ...
    </div>
</div>

I tried to get the width with JQuery like this:

$('#content').width();
$('#content').innerWidth();

both return the column-width, not the REAL width in all browsers except Firefox.

Any ideas how to get the width of the column layout?

Answer 1

I ran into the same problem trying to paginate an article horizontally using css3 columns as pages. Here's my solution as a jQuery plugin:

http://jsfiddle.net/rkarbowski/Sfyyy/

Here's the idea: you insert a blank <span> tag at the end of your column content and use .position() to grab its left position relative to the parent container, and add one -webkit-column-width (because .position() only tells you the distance to the left coordinate of the <span>).

Here's a little quirk that I don't understand. To get the correct width, you also have to subtract one -webkit-column-gap. In my mind, the distance between .position().left and the edge of the container should only be the width of the final column, -webkit-column-width. Can anyone explain this one? Am I just bad at math?

Sorry if the plugin code is sloppy; my experience with jQuery is limited :)

(Credit where it's due: idea adapted from How to Get CSS3 Multi-Column Count in Javascript.)