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wp-content/plugins/file-manager-advanced/application/library/js/ui/uploadButton.js

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+/**
+ * @class  elFinder toolbar's button tor upload file
+ *
+ * @author Dmitry (dio) Levashov
+ **/
+$.fn.elfinderuploadbutton = function(cmd) {
+	"use strict";
+	return this.each(function() {
+		var fm = cmd.fm,
+			button = $(this).elfinderbutton(cmd)
+				.off('click'), 
+			form = $('<form></form>').appendTo(button),
+			input = $('<input type="file" multiple="true" title="'+cmd.fm.i18n('selectForUpload')+'"/>')
+				.on('change', function() {
+					var _input = $(this);
+					if (_input.val()) {
+						fm.exec('upload', {input : _input.remove()[0]}, void(0), fm.cwd().hash);
+						input.clone(true).appendTo(form);
+					} 
+				})
+				.on('dragover', function(e) {
+					e.originalEvent.dataTransfer.dropEffect = 'copy';
+				}),
+			tm;
+
+		form.append(input.clone(true));
+				
+		cmd.change(function() {
+			tm && cancelAnimationFrame(tm);
+			tm = requestAnimationFrame(function() {
+				var toShow = cmd.disabled();
+				if (form.is('visible')) {
+					!toShow && form.hide();
+				} else {
+					toShow && form.show();
+				}
+			});
+		})
+		.change();
+	});
+};