gistfile1.js

(function() {
		var checkDuplicate = function(elem, options){
		};
		$.fn.checkDuplicate = function(options){
			var args = Array.prototype.slice.call(arguments);
			return this.each(function() {
				var currentTimer = 0;
				var _code = '';
				var $this = $(this);
				var defaults =  {
						error_container : '#check_result',
						waiting : '#waiting',
						target_text : '編碼',
						api_url: ''
					}
				this.options = $.extend(defaults, options);
				// 檢查程序
				var checkIt = function(){
					if(_code == ''){
						$(error_container).html(this.options.target_text+'不可為空白');
					}else{
						$(waiting).show();
						$.post(this.options.api_url, { code:  _code},
							function(data){
				            	$(this.options.waiting).hide();
								if(data['result']) {
									$(this.options.error_container).html(this.options.target_text+'可使用');
								}else{
									$(this.options.error_container).html(this.options.target_text+'已存在');
								}
				            }, "json");
					}
				};
				// 偵測
				$this.on('keyup', function(){
					_code = $this.val();
					clearTimeout(currentTimer);
					currentTimer = setTimeout("checkIt()", 800);
				});
			});
		}

	})();