avalon2学习教程10事件绑定_html/css_WEB-ITnose
avalon2的事件指令，比起avalon1来强大多了。
首先其内部是使用事件代理实现的，能冒泡的事件全部绑定document上。只有旧式IE的几个事件还绑定在原元素上。
其次，this直接指向vmodel，元素节点则通过e.target获取。如果要传入多个参数，需要指定事件对象，还是与原来一样使用$event
<div ms-click='@fn(111,222,$event)'>{{@ddd}}</div>再次，添加了一些专门针对事件回调的过滤器
-
对按键进行限制的过滤器esc，tab，enter，space，del，up，left，right，down
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对事件方法stopPropagation, preventDefault进行简化的过滤器stop, prevent
最后，对事件回调进行缓存，防止重复生成。
事件绑定是使用ms-on-☆绑定来实现，但avalon也提供了许多快捷方式，让用户能直接以ms-eventName调用那些常用事件，如下
animationend、 blur、 change、 input、 click、 dblclick、 focus、 keydown、 keypress、 keyup、 mousedown、 mouseenter、 mouseleave、 mousemove、 mouseout、 mouseover、 mouseup、 scan、 scroll、 submit
avalon的事件绑定支持多投事件机制（同一个元素可以绑定N个同种事件，如ms-click=fn, ms-click-1=fn2, ms-click-2=fn3）
<!DOCTYPE HTML><html> <head> <title>ms-on</title> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge" /> <script src="./dist/avalon.js" ></script> <script> var vm = avalon.define({ $id: "test", firstName: "司徒", array: ["aaa", "bbb", "ccc"], argsClick: function(e, a, b) { alert([].slice.call(arguments).join(" ")) }, loopClick: function(a, e) { alert(a + " " + e.type) }, status: "", callback: function(e) { vm.status = e.type }, field: "", check: function(e) { vm.field = e.target.value + " " + e.type }, submit: function() { var data = vm.$model if (window.JSON) { setTimeout(function() { alert(JSON.stringify(data)) }) } } }) </script> </head> <body> <fieldset ms-controller="test"> <legend>有关事件回调传参</legend> <div ms-mouseenter="@callback" ms-mouseleave="@callback">{{@status}}<br/> <input ms-on-input="@check"/>{{@field}} </div> <div ms-click="@argsClick($event, 100, @firstName)">点我</div> <div ms-for="el in @array" > <p ms-click="@loopClick(el, $event)">{{el}}</p> </div> <button ms-click="@submit" type="button">点我</button> </fieldset> </body></html>
<!DOCTYPE HTML><html> <head> <title>ms-on</title> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge" /> <script src="./dist/avalon.js" ></script> <script> var count = 0 var model = avalon.define({ $id: "multi-click", str1: "1", str2: "2", str3: "3", click0: function() { model.str1 = "xxxxxxxxx" + (count++) }, click1: function() { model.str2 = "xxxxxxxxx" + (count++) }, click2: function() { model.str3 = "xxxxxxxxx" + (count++) } }) </script> </head> <body> <fieldset> <legend>一个元素绑定多个同种事件的回调</legend> <div ms-controller="multi-click"> <div ms-click="@click0" ms-click-1="@click1" ms-click-2="@click2" >请点我</div> <div>{{@str1}}</div> <div>{{@str2}}</div> <div>{{@str3}}</div> </div> </fieldset> </body></html>
<!DOCTYPE HTML><html> <head> <title>ms-on</title> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge" /> <script src="./dist/avalon.js" ></script> <script> avalon.define({ $id: "xxx", fn: function() { console.log("11111111") }, fn1: function() { console.log("2222222") }, fn2: function() { console.log("3333333") } }) </script> </head> <body> <div ms-controller="xxx" ms-on-mouseenter-3="@fn" ms-on-mouseenter-2="@fn1" ms-on-mouseenter-1="@fn2" style="width:100px;height:100px;background: red;" > </div> </body></html>avalon已经对ms-mouseenter, ms-mouseleave进行修复，可以在 这里 与 这里 了解这两个事件。到chrome30时，所有浏览器都原生支持这两个事件。
<!DOCTYPE html> <html> <head> <title>ms-mouseenter, ms-mouseleave</title> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge" /> <script src="./dist/avalon.js"></script> <script> avalon.define({ $id: "test", fn1: function(e) { console.log(e.type) console.log(e.target) }, fn2: function(e) { console.log(e.type) console.log(e.target) } }) </script> </head> <body ms-controller="test"> <div ms-mouseenter="@fn1" ms-mouseleave="@fn2" style="background: red;width:200px;height: 200px;padding:20px;"> <div style="background: blue;width:160px;height: 160px;margin:20px;"></div> </div> </body></html>最后是mousewheel事件的修改，主要问题是出现firefox上，它死活也不愿意支持mousewheel，在avalon里是用DOMMouseScroll或wheel实现模拟的。我们在事件对象通过wheelDelta属性是否为正数判定它在向上滚动。
<!DOCTYPE html><html> <head> <title>ms-on-mousewheel</title> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge" /> <script src="./dist/avalon.js"></script> <script> var vm = avalon.define({ $id: "test", text: "", callback: function(e) { vm.text = e.wheelDelta + " " + e.type } }) </script> </head> <body ms-controller="test"> <div ms-on-mousewheel="@callback" id="aaa" style="background: red;width:200px;height: 200px;"> {{@text}} </div> </body></html>此外avalon还对input，animationend事件进行修复，大家也可以直接用avalon.bind, avalon.fn.bind来绑定这些事件。但建议都用ms-on绑定来处理。
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