javascript - How can I add an image from my computer behind an already set image with Fabric.JS? -


i have image frame transparent inside. set background of canvas css. i'm able add images canvas able add 1 image @ time behind transparent portion of frame. how might accomplish this? thank in advance!

var id = document.getelementbyid('rectangle') && rectangle ||    document.getelementbyid('anothercanvas') && anothercanvas;  var canvas = new fabric.canvas(id);    document.getelementbyid('file').addeventlistener("change", function (e) {      var file = e.target.files[0];      var reader = new filereader();      reader.onload = function (f) {          var data = f.target.result;          fabric.image.fromurl(data, function (img) {              var oimg = img.set({                  width: 125,                  height: 170              })              canvas.add(oimg).renderall();              var = canvas.setactiveobject(oimg);              var dataurl = canvas.todataurl({                  format: 'png',                  quality: 1              });          });      };      reader.readasdataurl(file);  });
canvas {    border: 1px solid #808080;    border-radius: 1px;  }    #rectangle {    background: url(http://i.imgur.com/0mt6ho1.png);    background-size: contain;    background-repeat: no-repeat;  }
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>  <script src="https://rawgit.com/kangax/fabric.js/master/dist/fabric.min.js"></script>  <input type="file" id="file"><br />  <canvas id="rectangle" width="637" height="412"></canvas>

an image inside of frame transparent

please add fabricjs image object left top properties:

var oimg = img.set({                 width: 125,                 height: 170,                 left: 430,                 top: 65             })

to make uploaded image behind shouldn't use background image. should insert regular image without controls. this:

fabric.image.fromurl('http://i.imgur.com/0mt6ho1.png', function (img) {             var oimg = img.set({                 scalex: 0.2,                 scaley: 0.2,                 selectable: false             })             canvas.add(oimg).renderall();            });

then when upload image, need make selected, move behind, , deselected:

fabric.image.fromurl(data, function (img) {             var oimg = img.set({                 width: 125,                 height: 170,                 left: 430,                 top: 65             })             canvas.add(oimg);             canvas.setactiveobject(oimg);             var image = canvas.getactiveobject();             image.moveto(-1);             canvas.discardactiveobject();             canvas.renderall();          });

if select object mouse automatically move object top, when deselect - move again.

check fiddle


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