/* jquery.spinner v1.0 copyright (c) 2014 by:loyaoo taobao:http://isseven.taobao.com */

(function($) {
	
	$.fn.spinner = function (opts) {
	
		var defaults = {value:1, min:1, len:3, max:99}
		var options = $.extend(defaults, opts)
		var keycodes = {up:38, down:40}
		return this.each(function() {
		
			var a = $('<a></a>'); f(a,0,"decrease","-");	//加
			var c = $('<a></a>'); f(c,0,"increase","+");	//减
			var b = $('<input/>');f(b,1,"amount");cv(0);	//值
			
			$(this).append(a).append(b).append(c);
			a.click(function(){cv(-1)});
			b.keyup(function(){cv(0)});
			c.click(function(){cv(+1)});
			b.bind('keyup paste change',function(e){
				e.keycode==keycodes.up&&cv(+1);
				e.keycode==keycodes.down&&cv(-1);
			});
			
			function cv(n){
				b.val(b.val().replace(/[^\d]/g,''));
				bv=parseint(b.val()||options.min)+n;
				bv>=options.min&&bv<=options.max&&b.val(bv);
				if(bv<=options.min){b.val(options.min);f(a,2,"disde","decrease");}else{f(a,2,"decrease","disde");}
				if(bv>=options.max){b.val(options.max);f(c,2,"disin","increase");}else{f(c,2,"increase","disin");}
			}
			
		});

		function f(o,t,c,s){
			t==0&&o.addclass(c).attr("href","javascript:void(0)").append("<i></i>").find("i").append(s);
			t==1&&o.addclass(c).attr({"value":options.value,"readonly":"readonly","autocomplete":"off","maxlength":options.len});
			t==2&&o.addclass(c).removeclass(s);
		}
	}
	
})(jquery);