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POLoader image not showing up when canvas rotating and resizing operation is going on selected file
 

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    <p>I have created sample code here <a href="http://jsfiddle.net/kamlesh_bhure/YpejU/" rel="nofollow">http://jsfiddle.net/kamlesh_bhure/YpejU/</a> where i am rotating image and resizing it as per max height and width.</p> <p>Before starting this process I am showing mask with loading image and hiding it after completing it. But I am not able to see this loader on mobile device or on desktop browser even though I used large image.</p> <p>Also I want to show loading image till browser complete its rendering of processed image.</p> <p>Thanks in advance.</p> <pre><code>&lt;!-- HTML Code --&gt; &lt;div id="mask" class="newLoaderMask"&gt; &lt;img src="http://jimpunk.net/Loading/wp-content/uploads/loading1.gif" width="200" id="loader" /&gt; &lt;/div&gt; &lt;input type="file" accept="image/*" id="takePictureField" /&gt; &lt;div class="captureInsuPanel"&gt; &lt;img id="yourimage" class="imgWeightHght" width="500" /&gt; &lt;/div&gt; &lt;canvas id="hidden_canvas_old"&gt;&lt;/canvas&gt; &lt;canvas id="hidden_canvas_new"&gt;&lt;/canvas&gt; &lt;style&gt; #yourimage { width:100%; } .imgWeightHght { height: 290px !important; width: 220px !important; } .captureInsuPanel img { height: auto; width: auto; } .newLoaderMask { display: none; background: #E5E5E5; position: fixed; left: 0; top: 0; z-index: 10; width: 100%; height: 100%; opacity: 0.8; z-index: 999; } &lt;/style&gt; &lt;script&gt; //Js Code $(document).ready(function () { $("#takePictureField").on("change", gotPic); }); function gotPic(event) { if (event.target.files.length == 1 &amp;&amp; event.target.files[0].type.indexOf("image/") == 0) { var image = event.target.files[0]; $("#yourimage").attr("src", URL.createObjectURL(image)); drawRotatedImage(image, 90, 800, 1000); } } function drawRotatedImage(image, angle, max_width, max_height) { //show loading mask $('#mask').show(); var fileLoader = new FileReader(), imageObj = new Image(); if (image.type.indexOf("image/") == 0) { fileLoader.readAsDataURL(image); } else { alert('File is not an image'); } fileLoader.onload = function () { var data = this.result; imageObj.src = data; }; fileLoader.onabort = function () { alert("The upload was aborted."); }; fileLoader.onerror = function () { alert("An error occured while reading the file."); }; // set up the images onload function which clears the hidden canvas context, // draws the new image then gets the blob data from it imageObj.onload = function () { var imgWidth = this.width; var imgHeight = this.height; rotateAndResize(this, imgWidth, imgHeight); }; function rotateAndResize(image, imgWidth, imgHeight) { var canvas = document.getElementById("hidden_canvas_old"), ctx = canvas.getContext("2d"); var widthHalf = imgWidth / 2, heightHalf = imgHeight / 2; canvas.width = imgWidth; canvas.height = imgWidth; ctx.clearRect(0, 0, canvas.width, canvas.height); ctx.save(); ctx.translate(canvas.width / 2, canvas.height / 2); ctx.rotate(angle * Math.PI / 180); ctx.drawImage(image, -widthHalf, -widthHalf); ctx.restore(); var tempCanvas = document.getElementById("hidden_canvas_new"), tCtx = tempCanvas.getContext("2d"); tempCanvas.width = imgHeight; tempCanvas.height = imgWidth; /* * Crop rotated image from old canvas to remove white space * So that canvas will have only image content without extra padding */ tCtx.drawImage(canvas, canvas.width - imgHeight, 0, imgHeight, imgWidth, 0, 0, imgHeight, imgWidth); tCtx.restore(); /** * Resizing Rotated image */ // calculate the width and height, constraining the proportions if (imgWidth &gt; imgHeight) { if (imgWidth &gt; max_width) { imgHeight = Math.round(imgHeight *= max_width / imgWidth); imgWidth = max_width; } } else { if (imgWidth &gt; max_height) { imgWidth = Math.round(imgWidth *= max_height / imgHeight); imgHeight = max_height; } } var tempCanvasTemp = tempCanvas; tempCanvas.remove(); canvas.remove(); var tempCanvas1 = document.createElement("canvas"), tCtx1 = tempCanvas1.getContext("2d"); tempCanvas1.id = 'hidden_canvas_new'; //tempCanvas1.style.display = 'none'; tempCanvas1.width = imgHeight; tempCanvas1.height = imgWidth; tCtx1.drawImage(tempCanvasTemp, 0, 0, imgHeight, imgWidth); tCtx1.restore(); document.body.appendChild(tempCanvas1); $("#yourimage").attr("src", tempCanvas1.toDataURL('image/jpeg')); } //hide loading mask $('#mask').hide(); } &lt;/script&gt; </code></pre>
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      1. VTUpMod
    1. COYou should copy your code here. StackOverflow prevents you from just having a jsFiddle only for a reason
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      1. USZach Saucier
    2. CO@Zeaklous I have edited Question with same code for more clarity.
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      1. USKammy
 

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