html - JavaScript: expand div to max height without getting scroll bars -


i working on document structure this:

<html> <head>   <script src="http:http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js" type="text/javascript" charset="utf-8"></script> </head> <body>  <h1>title</h1>  <div id="main"> <div id="head">some text</div> <div id="content"><canvas id="canvas"></canvas></div> <div id="foot">some more text (and table)</div> </div>  </body>  </html>

this is, of course, bit simplified, shows real structure of document.

now, want extend #canvas document wide , high possible without getting out of viewport (i.e., without getting scroll bars on document).

css-only solutions not o.k. @ least 2 reasons:

  1. this done dynamically, on request. depending on other factors, user may chose content of #canvas bigger or smaller that. want "make optimal size" button (i know how make button -- determining sizes).
  2. the canvas element not end determined size, changed, multiplier of parameter, i.e., if height maximal allowable height compute, canvas height set factor * math.floor(height / factor).

i have managed proper width using jquery:

canvas.width = 0; canvas.height = 0;  var t = $(canvas); var w = $(window).width() - (t.outerwidth(true) - t.width()); $(canvas).parents().map(function() {   t = $(this);   w -= t.outerwidth(true) - t.width(); });

this takes width of viewport , chips away borders, paddings , margins of #canvas , parents, after setting canvas size 0x0 (to prevent miscalculations if wide , document has scrollbars). works intended, however, i've been unsuccessful in doing similar height (and making work , modern browsers).

among other things, have tried using elements' position().top (which seems behave differently in seamonkey, chrome , firefox) , i've tried playing $(window)/$(document)/other elements' height(), innerheight() , outerheight(), none of these worked.

edit:

maybe additional explanation help. canvas gameboard. think chess (although not chess). so, user can chose play on grid of mxn tiles (m,n being integers chosen via jqueryui spins; each tile factor wide , high). so, want give user button "make board big possible without me needing scroll while playing".

edit (a possible solution)

this seems trick:

h = window.innerheight - $(main).position().top - $(main).outerheight(true);

i've tested under seamonkey (where $(window).height() not working expected), firefox , chrome. have no way of testing ie newer ie8 (where, expected, canvas doesn't work).


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