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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>

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<!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>

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<!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>

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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>

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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>

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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