By clicking on the "Run code Snippet" button or visiting this link, you may notice a significant amount of empty space at the beginning of the page. The images only become visible once you start scrolling down.
I am looking for a solution to hide this empty space at the top of the page.
I attempted to use the following CSS code:
position: relative; top: some px; bottom: some px;var canvas = new fabric.Canvas('canvas');
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({left: 0, top: 0, angle: 00,width:100, height:100}).scale(0.9);
var oImg = img.set({left: 0, top: 0, angle: 00, width: canvas.getWidth(), height: canvas.getHeight()});
canvas.add(oImg).renderAll();
var a = canvas.setActiveObject(oImg);
var dataURL = canvas.toDataURL({format: 'png', quality: 0.8});
});
};
reader.readAsDataURL(file);
});
var img = new Image();
img.onload = function() {
//draw after loading
var canvas = document.getElementById('case_canvas');
var ctx = canvas.getContext("2d");
ctx.drawImage(img, 0, 0, img.naturalWidth, img.naturalHeight);
}
img.src = "https://i.sstatic.net/xgNw7.png";
//^^ this will start loading the image/*.canvas-container {
background: url("https://i.sstatic.net/xgNw7.png") no-repeat fixed center;
}
*/
.canvas-container {
width: 300px; height: 500px; position: relative; -webkit-user-select: none; top:900px;
}
#canvas
{
border: 1px solid black;
top:500px;
}
#file
{
position:relative;top:900px;
}
.lower-canvas
{
position: absolute; width: 300px; height: 500px; bottom:400px; left: 0px; -webkit-user-select: none;
}
.upper-canvas {
position: absolute; width: 300px; height: 500px; left: 0px; top: 0px; -webkit-user-select: none; cursor: default;
}<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="canvas" width="450" height="450"></canvas>
<div class="canvas-container">
<canvas id="case_canvas" width="300" height="500" class="lower-canvas" ></canvas>
<canvas class="upper-canvas " width="300" height="500" ></canvas>
</div>