Created
August 15, 2018 17:25
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select and set uploaded file to canvas
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<div class="drag-area"> | |
<div>Tarik dan lepaskan file gambar disini, atau</div> | |
<div class="custom-file" lang="id"> | |
<input type="file" class="custom-file-input image-file" id="image-file"> | |
<label class="custom-file-label" for="image-file"></label> | |
</div> | |
<div class="result-image-block"> | |
<img src="" alt="" class="result-image" width="500" /> | |
</div> | |
</div> | |
<style> | |
.drag-area { | |
border: 3px dashed #cccccc; | |
text-align: center; | |
padding: 10px; | |
margin-top: 5px; | |
overflow: hidden; | |
font-size: 14px; | |
} | |
.custom-file { | |
margin: 1rem 0 .25rem; | |
} | |
.custom-file-input ~ .custom-file-label::after { | |
content: "Pilih File"; | |
} | |
.drag-area.over { | |
border-color: #ff0000; | |
background-color: #FFE9EA; | |
} | |
.result-image-block { | |
display: none; | |
margin: 10px auto 5px; | |
text-align: center; | |
width: 100%; | |
} | |
.result-image { | |
box-shadow: rgba(0,0,0,0.4) 0 2px 5px; | |
width: 100%; | |
margin: 0 auto; | |
} | |
</style> | |
<script> | |
jQuery.event.addProp('dataTransfer'); | |
var dropTimer; | |
var dropTarget = $('.drag-area'); | |
var fileInput = $('#image-file'); | |
dropTarget.on("dragover", function(event) { | |
clearTimeout(dropTimer); | |
if (event.currentTarget == dropTarget[0]) { | |
dropTarget.addClass('over'); | |
} | |
return false; // Required for drop to work | |
}); | |
dropTarget.on('dragleave', function(event) { | |
if (event.currentTarget == dropTarget[0]) { | |
dropTimer = setTimeout(function() { | |
dropTarget.removeClass('over'); | |
}, 200); | |
} | |
}); | |
var handleDrop = function(files){ | |
dropTarget.removeClass('over'); | |
var file = files[0]; // Multiple files can be dropped. Lets only deal with the "first" one. | |
if (file.type.match('image.*')) { | |
resizeImage(file, 1000, function(result) { | |
$('.result-image').attr('src', result); | |
$('.result-image-block').show(); | |
}); | |
} else { | |
alert("That file wasn't an image."); | |
} | |
}; | |
dropTarget.on('drop', function(event) { | |
event.preventDefault(); // Or else the browser will open the file | |
handleDrop(event.dataTransfer.files); | |
}); | |
fileInput.on('change', function(event) { | |
handleDrop(event.target.files); | |
}); | |
var resizeImage = function(file, size, callback) { | |
var fileTracker = new FileReader; | |
fileTracker.onload = function() { | |
var image = new Image(); | |
image.onload = function(){ | |
var canvas = document.createElement("canvas"); | |
/* | |
if(image.height > size) { | |
image.width *= size / image.height; | |
image.height = size; | |
} | |
*/ | |
if(image.width > size) { | |
image.height *= size / image.width; | |
image.width = size; | |
} | |
var ctx = canvas.getContext("2d"); | |
ctx.clearRect(0, 0, canvas.width, canvas.height); | |
canvas.width = image.width; | |
canvas.height = image.height; | |
ctx.drawImage(image, 0, 0, image.width, image.height); | |
callback(canvas.toDataURL("image/png")); | |
}; | |
image.src = this.result; | |
} | |
fileTracker.readAsDataURL(file); | |
fileTracker.onabort = function() { | |
alert("The upload was aborted."); | |
} | |
fileTracker.onerror = function() { | |
alert("An error occured while reading the file."); | |
} | |
}; | |
</script> |
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