javascript - iScroll zoom factor calculation -

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i have problem , hope me out.

jsfiddle: https://jsfiddle.net/estsiim/zjqptg9j/3/

html:

<div id="wrapper">      <div id="content">      </div>  </div>  <br><br><br>  <button id="btn">zoom view</button>

css:

#wrapper {     width: 500px;     height: 500px;     border: 1px solid black;      overflow: hidden;     position: relative; }  #content {     width: 700px;     height: 300px;     background-color: blue; }

javascript:

var myscroll = new iscroll('#wrapper', {         mousewheel: true,         keybindings: true,         wheelaction: 'zoom',         scrollbars: true,         scrollx: true,         scrolly: true,         zoommin: 0.1,         zoom: true,          mousewheelspeed: 20, });   var zoomfactor = 0.4;  //need calculate somehow  $('#btn').on('click', function() {      myscroll.zoom(myscroll.scale - zoomfactor);  });

so want iscroll (https://github.com/cubiq/iscroll) zoom out of content showing. problem content size not fixed (it can 700x300, 2000x3000, 200x900 , on).

thank time

use method, if understand correct want reset content, implemented on both dimensions (width vs height), if need 1 of modify fit factor return exact percent of dimension (no max pick 1 return), fiddle here:

//get wrapper dimensions var wrap = {     h : $('#wrapper').height(),     w : $('#wrapper').width() } //get content dimensions var content = {     h : $('#content').height(),     w : $('#content').width(),    };  var myscroll = new iscroll('#wrapper', {         mousewheel: true,         keybindings: true,         wheelaction: 'zoom',         scrollbars: true,         scrollx: true,         scrolly: true,         zoommin: 0.1,         zoom: true,          mousewheelspeed: 20, }); //compute reset zoom factor var fitfactor = function () {     //compute witch dimension larger width vs height     h = content.h / wrap.h;//zoom factor height     w = content.w/ wrap.w;//zoom factor width     //get max between zoom factores, remove percents     renderedfactor = math.max(h, w);     //return scale factor     return  1/renderedfactor; };  $('#btn').on('click', function() {     myscroll.zoom(fitfactor());  });

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