Please follow the below example to Image resizing
client-side with JavaScript before upload to the server. In modern browser you
can use canvas to load and save images data. All modem browsers are supported
to the FileReader.
/// How do I read image using
FileReader?
/// Example to read file using
FileReader.
<input
type='file'
accept='image/*'
onchange='openFile(event)'><br>
<img
id='output'>
<script>
var openFile
= function(event)
{
var input
= event.target;
var reader
= new FileReader();
reader.onload
= function(){
var dataURL
= reader.result;
var output
= document.getElementById('output');
output.src
= dataURL;
};
reader.readAsDataURL(input.files[0]);
};
</script>
/// How do I resize an image on the
client size before upload?
/// JavaScript compress image before
upload.
/// Resize image (client side) on an
html form before upload in your applications.
<!doctype html>
<html>
<head>
<meta
content="text/html;
charset=UTF-8" http-equiv="Content-Type"
/>
<title>JavaScript/jQuery
- compress image before upload.</title>
<script
type="text/javascript">
var
fileReader = new
FileReader();
var
filterType =
/^(?:image\/bmp|image\/cis\-cod|image\/gif|image\/ief|image\/jpeg|image\/jpeg|image\/jpeg|image\/pipeg|image\/png|image\/svg\+xml|image\/tiff|image\/x\-cmu\-raster|image\/x\-cmx|image\/x\-icon|image\/x\-portable\-anymap|image\/x\-portable\-bitmap|image\/x\-portable\-graymap|image\/x\-portable\-pixmap|image\/x\-rgb|image\/x\-xbitmap|image\/x\-xpixmap|image\/x\-xwindowdump)$/i;
fileReader.onload
= function (event)
{
var image
= new Image();
image.onload=function(){
document.getElementById("original-Img").src=image.src;
var canvas=document.createElement("canvas");
var context=canvas.getContext("2d");
canvas.width=image.width/4;
canvas.height=image.height/4;
context.drawImage(image,
0,
0,
image.width,
image.height,
0,
0,
canvas.width,
canvas.height
);
document.getElementById("upload-Preview").src
= canvas.toDataURL();
}
image.src=event.target.result;
};
var
loadImageFile = function
() {
var uploadImage
= document.getElementById("upload-Image");
//check and retuns the length of uploded file.
if (uploadImage.files.length
=== 0) {
return;
}
//Is Used for validate a valid file.
var uploadFile
= document.getElementById("upload-Image").files[0];
if (!filterType.test(uploadFile.type))
{
alert("Please
select a valid image.");
return;
}
fileReader.readAsDataURL(uploadFile);
}
</script>
</head>
<body
onload="loadImageFile();">
<form
name="uploadForm">
<table>
<tbody>
<tr>
<td>Select
Image - <input
id="upload-Image"
type="file"
onchange="loadImageFile();"
/></td>
</tr>
<tr>
<td>Origal
Img - <img
id="original-Img"/></td>
</tr>
<tr>
<td>Compress
Img - <img
id="upload-Preview"/></td>
</tr>
</tbody>
</table>
</form>
</body>
</html>
Result looks like – https://embed.plnkr.co/oyaVFn/
I hope you are enjoying with this post!
Please share with you friends!! Thank you!!!
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Hi there! Welcome to my blog. My name is Anil Singh. I'm a author of this blog.
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