html - Jquery crop using canvas not working -

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hi given below code. 1 html file. trying crop image box. when draw canvas resolutions coming wrong. please help.

i need cut portion of image box lies.

    <html>     <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>     <style> body, html {     height: 100%;     margin: 0;     padding: 0;     width: 100%; }  #container {     width: 100%;     height: 100%;     position: fixed; }  .cover-container {     display: table;     height: 315px;     margin: 5% auto 0;     width: 90%;     position: relative; }  #camera {     height: 100%;     position: fixed;     width: 100%; }  #camera2 {     height: 100%;     position: fixed;     width: 100%; }  #cover {     display: block;     height: 315px;     left: 0;     /* position: absolute; */     top: 0;     width: 100%; }  #capturebtn {     z-index: 9999;     width: 100%;     height: auto; }  #capturebtn input {     width: 100px;     height: 50px;     margin: 0 auto;     right: 0;     bottom: 15px;     left: 0;     position: fixed; }  @media(max-width:960px) , (min-width: 768px) {     #cover {         display: block;         height: 241px !important;         left: 0;         position: absolute;         top: 0;         width: 650px !important;     }     .cover-container {         display: table;         height: 241px;         margin: 5% auto 0;         width: 650px;         position: relative;     } }  #capture {     left: -100px !important; }  #reset {     left: 100px !important; }  #crop {     left: 300px !important; }  @media(max-width:767px) , (min-width: 360px) {     #cover {         display: block;         height: 185px !important;         left: 0;         position: absolute;         top: 0;         width: 500px !important;     }     .cover-container {         display: table;         height: 185px;         margin: 5% auto 0;         width: 500px;         position: relative;     } }     </style>     <script>     var croppicture = function () {       var cover = document.getelementbyid("cover");     var ctx = cover.getcontext("2d");        var img = new image();     img.onload = function () {           var position = $("#cover").offset();          //alert(json.stringify($("#cover").offset()));         //alert("cover width " + cover.width);         //alert("cover height" + cover.height);         //alert(position.left);           var coverleft = position.left;         var covertop = position.top;           var coverwidth = 851;         var coverheight = 315;           //            var width = $('#cover').width();         //            var parentwidth = $('#container').offsetparent().width();         //            var percent = 100 * width / parentwidth;          //alert("percent " + percent);         alert("innerwidth " + window.innerwidth);          var destwidth = $('#cover').width();         var destheight = $('#cover').height();          alert("destwidth " + destwidth);          ctx.drawimage(img, coverleft, covertop, coverwidth, coverheight, 0, 0, destwidth, destheight);          //$("#source").css("display", "none");     }     img.src = document.getelementbyid("source").src;   }     </script>      <body> <div id="container">     <div class="cover-container">         <canvas id="cover" height="315" width="851" style="border:1px solid #000"></canvas>     </div>     <img id="source" width="100%" height="100%" src="http://www.freedigitalphotos.net/images/img/homepage/87357.jpg"> </div> <div id="capturebtn">     <input id="crop" type="button" value="crop" onclick="croppicture();" /> </div>     </body>      </html>


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