Javascript convert width and height to font-size

Question

I\'m not sure if this question has already been asked and answered but I haven\'t found any relevant result.

I would like to know if it\'s possible to calculate and

Answer 1

I've made a small interface for what I understand is your question : you input the max width and max height for some text and it automatically computes the size of the font to adapt the text : http://jsfiddle.net/kPZ3E/

HTML :

Max width : <input id=width value=200> px
<br>Max height : <input id=height value=20> px
<br><br>
<table border=1><tr><td id=txtcell nowrap><span id=txt style=>Some sample text.</span></td></tr></table>
<br>Font Size : <span id=mes></span>​

JS :

var fontSize = 100;
var reduce = function() {
    $('#txt').css('font-size', fontSize);
    $('#mes').html(fontSize);
    if ($('#txt').width()>$('#width').val() || $('#txt').height()>$('#height').val()) {
       fontSize -= 1;
       reduce();
    }
};
reduce();
$('#width, #height').change(function(){fontSize = 100;reduce()});

Note : the timeout in the fiddle is only here to show the reduction process with an animation.