JavaScript Scale Text to Fit in Fixed Div

In JavaScript/jQuery, how can I scale a varying-length line of text inside a fixed-width Div so that the one line always fits inside the Div (as one line)?

Thanks.

Solution 1:

This is somewhat of a hack, but will do what you want.

<div id="hidden-resizer" style="visibility: hidden"></div>

Place this at the bottom of your page, where it will not be moving other elements on the page.

Then do this:

var size;
var desired_width = 50;
var resizer = $("#hidden-resizer");

resizer.html("This is the text I want to resize.");

while(resizer.width() > desired_width) {
  size = parseInt(resizer.css("font-size"), 10);
  resizer.css("font-size", size - 1);
}

$("#target-location").css("font-size", size).html(resizer.html());

Solution 2:

HTML:

<div class="box" style="width:700px">This is a sentence</div>
<div class="box" style="width:600px">This is a sentence</div>
<div class="box" style="width:500px">This is a sentence</div>
<div class="box" style="width:400px">This is a sentence</div>

JavaScript:

$( '.box' ).each(function ( i, box ) {

    var width = $( box ).width(),
        html = '<span style="white-space:nowrap"></span>',
        line = $( box ).wrapInner( html ).children()[ 0 ],
        n = 100;

    $( box ).css( 'font-size', n );

    while ( $( line ).width() > width ) {
        $( box ).css( 'font-size', --n );
    }

    $( box ).text( $( line ).text() );

});

Live demo: http://jsfiddle.net/e8B9j/2/show/

Remove "/show/" from the URL to view the code.