Straight to point. I want to set the limit of the width and height of the image when user upload an image using plupload.
Letsay: if width: 1000px height: 1000px else you must upload image with at least width:1000px and height:1000px
// $(".form").validator();
$(function() {
if($("#uploader").length > 0) {
var uploader = new plupload.Uploader({
runtimes : 'html5,flash,silverlight',
browse_button : 'pickfile',
container : 'uploader',
max_file_size : '10mb',
url : 'design.php?do=upload&ajax=1',
multiple_queues: false,
file_data_name: 'design',
flash_swf_url : www + '/js/plupload.flash.swf',
silverlight_xap_url : www + '/js/plupload.silverlight.xap',
filters : [
{title : "Image files", extensions : "jpg,gif,png,jpeg,bmp"}
]
});
$('#uploadfiles').click(function(e) {
if($("#uploader select[name=category]").val() == "") {
$("#uploader select[name=category]").next('.error-required').show();
return false;
}
uploader.start();
e.preventDefault();
});
uploader.init();
So, is this possible?
You can easily write a filter for plupload.
Here is filter for min required width. Add bellow code to your script. (Just copy)
plupload.addFileFilter('min_width', function(maxwidth, file, cb) {
var self = this, img = new o.Image();
function finalize(result) {
// cleanup
img.destroy();
img = null;
// if rule has been violated in one way or another, trigger an error
if (!result) {
self.trigger('Error', {
code : plupload.IMAGE_DIMENSIONS_ERROR,
message : "Image width should be more than " + maxwidth + " pixels.",
file : file
});
}
cb(result);
}
img.onload = function() {
// check if resolution cap is not exceeded
finalize(img.width >= maxwidth);
};
img.onerror = function() {
finalize(false);
};
img.load(file.getSource());
});
And add this filter to your upload script.
filters : {
min_width: 700,
},
Plupload doesn't support this itself ( although it has been requested ). There are probably a couple of reasons for this, firstly because you just can't get the image dimensions before upload in IE ( you can in some other browsers ) and secondly, whilst that would work for some browsers using the using the HTML4/5 methods, I am not sure that the Flash/Silverlight etc. methods would also be able to reliably determine dimensions.
If you were happy with limited browser, HTML4/5 methods only you should hook into the "FilesAdded" event eg
uploader.bind('FilesAdded', function(up, files) {
//Get src of each file, create image, remove from file list if too big
});
I recently wanted to do the same thing, and was able to achieve it the way Thom was suggesting. He was correct on it's limitation though; if you want to add this, it will only work in modern browsers and not in the flash or silverlight runtimes. This is not a huge issue, as my non-html5 users will just get an error after upload, rather than before.
I initialized a total image count variable to keep track of the images placed on the page. Also a vairable to store photos we want to delete after we read them all.
var total_image_count = 0;
var files_to_remove = [];
Then I read the pending files with FileReader(), place them on the page, and get their width
init:{
FilesAdded: function(up, files) {
if (uploader.runtime == "html5"){
files = jQuery("#"+uploader.id+"_html5")[0].files
console.log(files);
for (i in files){
//create image tag for the file we are uploading
jQuery("<img />").attr("id","image-"+total_image_count).appendTo("#upload-container");
reader_arr[total_image_count] = new FileReader();
//create listener to place the data in the newly created
//image tag when FileReader fully loads image.
reader_arr[total_image_count].onload = function(total_image_count) {
return function(e){
var img = $("#image-"+total_image_count);
img.attr('src', e.target.result);
if ($(img)[0].naturalWidth < 1000){
files_to_remove.push(files[i]); //remove them after we finish reading in all the files
//This is where you would append an error to the DOM if you wanted.
console.log("Error. File must be at least 1000px");
}
}
}(total_image_count);
reader_arr[total_image_count].readAsDataURL(files[i]);
total_image_count++;
}
for (i in files_to_remove){
uploader.removeFile(files_to_remove[i]);
}
}
}
}
As a side note, I was wanting to show image thumbnails anyway, so this method works great for me. I have not figured out how to get an image's width without first appending it to the DOM.
Sources:
Thumbnail an image before upload: https://stackoverflow.com/a/4459419/686440
Accessing image's natural width: https://stackoverflow.com/a/1093414/686440
to access width and heigth without thumbnail an image you can do this:
uploader.bind('FilesAdded', function(up, files) {
files = jQuery("#"+uploader.id+"_html5").get(0).files;
jQuery.each(files, function(i, file) {
var reader = new FileReader();
reader.onload = (function(e) {
var image = new Image();
image.src = e.target.result;
image.onload = function() {
// access image size here using this.width and this.height
}
};
});
reader.readAsDataURL(file);
}
}
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