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迷你MVVM框架 avalonjs 学习教程14、事件绑定
之前的章节许多示例代码也或多或少地展示了如何使用ms-click来绑定事件了。能直接在模板上绑定是事件,这也是静态模板与动态绑定的一大区别。ms-click不是简单的onclick的别名,它在内部屏蔽了浏览器的差异,并且对许多浏览器暂时不支持的事件做了兼容处理。
总的来说,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
事件绑定的属性值的格式,必须是函数名或函数名后+小括号(小括号里面添加参数)。
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),支持传参(默认第一个参数为事件对象,如果第一个位置被占了,我们可以在其他位置使用$event引用事件对象。)
<!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="http://www.mamicode.com/avalon.js" ></script> <script> var model = avalon.define({ $id: "test", firstName: "司徒", array: ["aaa", "bbb", "ccc"], argsClick: function(e, a, b) { alert([].slice.call(arguments).join(" ")) }, loopClick: function(a, e) { alert(a + " " + e.type) }, status: "", callback: function(e) { model.status = e.type }, field: "", check: function(e) { model.field = this.value + " " + e.type }, submit: function() { var data = http://www.mamicode.com/model.$model"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-each-el="array" > <p ms-click="loopClick(el, $event)">{{el}}</p> </div> <button ms-click="submit">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="http://www.mamicode.com/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="http://www.mamicode.com/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="http://www.mamicode.com/avalon.js"></script> <script> avalon.define({ $id: "test", fn1: function(e) { console.log(e.type) console.log(this) }, fn2: function(e) { console.log(e.type) console.log(this) } }) </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="http://www.mamicode.com/avalon.js"></script> <script> var model = avalon.define({ $id: "test", text: "", callback: function(e) { model.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。
迷你MVVM框架 avalonjs 学习教程14、事件绑定