add size limit and width and height limit

@@ -11,7 +11,18 @@ $.fn.ajaxfileupload = function(options) {
       onCancel: function() {},
       validate_extensions: true,
       valid_extensions: ['gif', 'png', 'jpg', 'jpeg'],
-      submit_button: null
+	  // added by xuhongyun for upload limit
+	  // 上传大小: 单位kb, 默认限制50mb
+	  // size="500" spec="1500*1500"
+	  size_limit: 50 * 1024,
+	  
+	  // 图片规格 width * heith，单位px, 默认不限制
+	  valid_spec: false,
+      width_limit: 0,   
+	  height_limit: 0,
+	  // end added
+	
+      submit_button: null 
     };
 
     var uploading_file = false;
@@ -27,6 +38,27 @@ $.fn.ajaxfileupload = function(options) {
     if (extend) {
       settings.valid_extensions = extend.split(',');
     }
+	
+	// add by xuhongyun for upload limit
+	var size = $element.attr("size");
+	if (size) {
+		settings.size_limit = parseInt(size);
+	}
+	
+	var spec = $element.attr("spec");
+	if (spec) {
+		var array = spec.split('*');
+		  if (array.length == 2) {
+			settings.width_limit = parseInt(array[0]);
+			settings.height_limit = parseInt(array[1]);
+		  }
+		  
+		  if (settings.width_limit != 0 && settings.height_limit != 0) {
+			 settings.valid_spec = true;
+		  }
+	}
+	// end added
+	
     // var bucket = $element.attr("bucket");
     // if(bucket){
     //   settings.params.bucket=bucket;
@@ -54,6 +86,60 @@ $.fn.ajaxfileupload = function(options) {
 
       var ext = $element.val().split('.').pop().toLowerCase();
       console.log(settings.validate_extensions);
+	
+	  // add by xuhongyun for upload limit
+      var files = $element[0].files;
+	  if (files) {
+		 $.each(files, function(index, file) {	        
+			// 加载图片，为了获取图片大小
+			var windowURL = window.URL || window.webkitURL;
+	        var dataURL = windowURL.createObjectURL(file);
+			
+	        var frame_id = 'preview-' + Math.round(new Date().getTime());
+	        $('<img id="' + frame_id +'"  />').appendTo('body').attr("src", dataURL);
+	        var img = $('#' + frame_id)[0];
+//	        if (img.complete) { 
+//	        	alert("加载完成");
+//	        }
+//			else {
+			    img.onload = function() {
+			    	var width = img.offsetWidth,
+			            height = img.offsetHeight;
+			
+			        if (settings.valid_spec == true
+			            && Math.abs(width - settings.width_limit) > 10
+				        && Math.abs(height - settings.height_limit) > 10 ) {
+					    // 图片规格超出限制
+					    settings.onComplete.apply($element, [{
+	                       status: false,
+	                       message: '只允许上传' + settings.width_limit + '*' + settings.height_limit + '的文件，第' + (index+1) + '个文件不符合要求'
+	                   }, settings.params]);
+	                   var _$element = $element.clone();
+	                   var _$parent = $element.parent();
+	                   $element.remove();
+	                   _$parent.append(_$element);
+	                   _$element.ajaxfileupload(settings);
+				    }
+//			    }
+			};
+				
+			
+			if (file.size / 1024 > settings.size_limit) {
+				// 上传大小超出限制。
+				settings.onComplete.apply($element, [{
+                   status: false,
+                   message: '只允许上传大小' + settings.size_limit + 'KB以内的文件，第' + (index + 1) + '个文件不符合要求'
+               }, settings.params]);
+               var _$element = $element.clone();
+               var _$parent = $element.parent();
+               $element.remove();
+               _$parent.append(_$element);
+               _$element.ajaxfileupload(settings);
+			   return;
+			}		
+		});
+	}
+	  // end added
       if (true === settings.validate_extensions && $.inArray(ext, settings.valid_extensions) == -1) {
         settings.onComplete.apply($element, [{
           status: false,