Mozilla中:
addEventListener的使用方式:
target.addEventListener(type, listener, useCapture);
target: 文档节点、document、window 或 XMLHttpRequest。 type: 字符串,事件名称,不含“on”,比如“click”、“mouseover”、“keydown”等。 listener :实现了 EventListener 接口或者是 JavaScript 中的函数。 useCapture :是否使用捕捉,一般用 false 。例如:document.getElementById("testText").addEventListener("keydown", function (event) { alert(event.keyCode); }, false);
IE中:
target.attachEvent(type, listener); target: 文档节点、document、window 或 XMLHttpRequest。 type: 字符串,事件名称,含“on”,比如“onclick”、“onmouseover”、“onkeydown”等。 listener :实现了 EventListener 接口或者是 JavaScript 中的函数。 例如:document.getElementById("txt").attachEvent("onclick",function(event){alert(event.keyCode);});
W3C 及 IE 同时支持移除指定的事件, 用途是移除设定的事件, 格式分别如下:
W3C格式:
removeEventListener(event,function,capture/bubble);
Windows IE的格式如下:
detachEvent(event,function);
target.addEventListener(type, listener, useCapture); target 文档节点、document、window 或 XMLHttpRequest。 type 字符串,事件名称,不含“on”,比如“click”、“mouseover”、“keydown”等。 listener 实现了 EventListener 接口或者是 JavaScript 中的函数。 useCapture 是否使用捕捉,看了后面的事件流一节后就明白了,一般用 false 事件触发时,会将一个 Event 对象传递给事件处理程序,比如: document.getElementById("testText").addEventListener("keydown", function (event) { alert(event.keyCode); }, false); 适应的浏览器版本不同,同时在使用的过程中要注意 attachEvent方法 按钮onclick IE中使用 addEventListener方法 按钮click fox中使用 两者使用的原理:可对执行的优先级不一样,下面实例讲解如下: attachEvent方法,为某一事件附加其它的处理事件。(不支持Mozilla系列) addEventListener方法 用于 Mozilla系列 举例: document.getElementById("btn").onclick = method1; document.getElementById("btn").onclick = method2; document.getElementById("btn").onclick = method3;如果这样写,那么将会只有medhot3被执行 写成这样: var btn1Obj = document.getElementById("btn1"); //object.attachEvent(event,function); btn1Obj.attachEvent("onclick",method1); btn1Obj.attachEvent("onclick",method2); btn1Obj.attachEvent("onclick",method3);执行顺序为method3->method2->method1 如果是Mozilla系列,并不支持该方法,需要用到addEventListener var btn1Obj = document.getElementById("btn1"); //element.addEventListener(type,listener,useCapture); btn1Obj.addEventListener("click",method1,false); btn1Obj.addEventListener("click",method2,false); btn1Obj.addEventListener("click",method3,false);执行顺序为method1->method2->method3 实例:(要注意的是div必须放到js前面才行)
复制代码代码如下: <html> <head> </head> <body> <div id="name1" style="border:1px solid red;padding:10px 10px 10px 10px;" style="border:1px solid red;padding:10px 10px 10px 10px;"> <div id="name2" style="border:1px solid green;padding:10px 10px 10px 10px;" style="border:1px solid green;padding:10px 10px 10px 10px;">点击</div> </div> <div id="info"></div> <script type="text/javascript"><!-- var name1=document.getElementById('name1'); //要注意 var name2=document.getElementById('name2'); //要注意 var info=document.getElementById('info'); if(name1.attachEvent){ //对于attachEvent前面的target我们一定要保证不为空 name1.attachEvent('onclick',function () { info.innerHTML += "红色" + "<br>"; }); name2.attachEvent('onclick',function () { info.innerHTML += "绿色" + "<br>"; }); }else{ name1.addEventListener('click',function () { info.innerHTML += "红色" + "<br>"; },false); name2.addEventListener('click',function () { info.innerHTML += "绿色" + "<br>"; },false); } // --></script> </body> </html>
从W3C的发展时间轴来看, DOM(Document Object Model)的模型可以分为两种, DOM 0 及 DOM 2. 从数字来看就可以知道DOM 0 当然是比较旧的协议, 我们可以从以下的表格来看: DOM1 协定:
| Event Name | Description | onblur() | The element has lost focus (that is, it is not selected by the user). | onchange0 | The element has either changed (such as by typing into a text field) or the element has lost focus. | onclick0 | The mouse has been clicked on an element. | ondblclick() | The mouse has been double-clicked on an element. | onfocus() | The element has gotten focus. | onkeydown() | A keyboard key has been pressed down (as opposed to released) while the element has focus. | onkeypress() | A keyboard key has been pressed while the element has focus. | onkeyup() | A keyboard key has been released while the element has focus. | onload() | The element has loaded (document, frameset, or image). | onmousedown() | A mouse button has been pressed. | onmousemove() | The mouse has been moved. | onmouseout() | The mouse has been moved off of or away from an element. | onmouseover() | The mouse has moved over an element. | onmouseup() | A mouse button has been released. | onreset() | The form element has been reset, such as when a form reset button is pressed. | onresize() | The window's size has been changed. | onselect() | The text of a form element has been selected. | onsubmit() | The form has been submitted. | onunload() | The document or frameset has been unloaded. |
DOM2 的进化:
DOM 0 Event | DOM 2 Event | onblur() | blur | onfocus() | focus | onchange() | change | onmouseover() | mouseover | onmouseout() | mouseout | onmousemove() | mousemove | onmousedown() | mousedown | onmouseup() | mouseup | onclick() | click | ondblclick() | dblclick | onkeydown() | keydown | onkeyup() | keyup | onkeypress() | keypress | onsubmit() | submit | onload() | load | onunload() | unload |
新的DOM2 用法可以addEventListener()这个函数来观察到: addEventListener(event,function,capture/bubble); 参数event如上表所示, function是要执行的函数, capture与bubble分别是W3C制定得两种时间模式,简单来说capture就是从document的开始读到最后一行, 再执行事件, 而bubble则是先寻找指定的位置再执行事件. capture/bubble的参数是布尔值, True表示用capture, False则是bubble.Windows Internet Explorer也有制定一种EventHandler, 是 attachEvent(), 格式如下: window.attachEvent(”submit”,myFunction()); 比较特别的是attachEvent不需要指定capture/bubble的参数, 因为在windows IE环境下都是使用Bubble的模式.这里用图像的Rollover例子来表现事件的用法: <!DOCTYPE HTML PUBLIC “-//W3C//DTD HTML 4.01//EN” “http://www.w3.org/TR/html4/strict.dtd“> <html> <head> <title>Rollover</title> <script type=”text/javascript”>function moveOver(imgObj) { if (typeof window.addEventListener != “undefined”) { imgObj.addEventListener(”mouseover”,function(){imgObj.src = imgObj.id + “_over.png”;}, false); imgObj.addEventListener(”mouseout”, function(){imgObj.src = imgObj.id + “_default.png”;}, false); } else { imgObj.attachEvent(”onmouseover”,function(){imgObj.src = imgObj.id + “_over.png”;}); imgObj.attachEvent(”onmouseout”, function(){imgObj.src = imgObj.id + “_default.png”;}); } } function rollover() { var images = document.getElementsByTagName(”img”); var roll = new RegExp (”rollover”); var preload = []; for (var i = 0; i < images.length; i++) { if (images[i].id.match(roll)) { preload[i] = new Image(); preload[i].src = images[i].id + “_over.png”;
moveOver(images[i]); } } } if (typeof window.addEventListener != “undefined”) { window.addEventListener(”load”,rollover,false); } else { window.attachEvent(”onload”,rollover) } </script> </head> <body> <p><img id=”rollover_home” name=”img_home” src=”rollover_home_default.png” alt=”Home”></p> <p><img id=”rollover_about” name=”img_about” src=”rollover_about_default.png” alt=”About”></p> <p><img id=”rollover_blog” name=”img_blog” src=”rollover_blog_default.png” alt=”Blog”></p> <p><img id=”logo” name=”img_logo” src=”logo.png” alt=”Braingia Logo”></p> </body> </html> 上述的 typeof window.addEventListener != “undefined” 程序代码可以判断使用者的浏览器是否支持AddEventListener这个事件模型, 如果不支持就使用attachEvent. W3C 及 IE 同时支持移除指定的事件, 用途是移除设定的事件, 格式分别如下: W3C格式: removeEventListener(event,function,capture/bubble); Windows IE的格式如下: detachEvent(event,function);
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