测试环境(客户端浏览器 )
IE6,IE7, IE8兼容模式, IE8
Firefox 3.6.8, google chrome 5.0.375.125
先来说明两个函数的标准定义。
elementNode.setAttribute(name,value)
name 必需。规定要设置的属性名。
value 必需。规定要设置的属性值。
该方法把指定的属性设置为指定的值。如果不存在具有指定名称的属性,该方法将创建一个新属性。
elementNode.getAttribute(name)
name 必需。规定从中取得属性值的属性。
一、setAttribute的问题
elementNode为<tr>...</tr>
希望对其增加一个单击行的事件处理函数,
写法1:
table1row1.setAttribute("onclick", "selectrow1(this)");
IE8, Firefox, google chrome 能正确触发click 事件
IE6,IE7则不能触发click 事件。
写法2:
table2row1.onclick = function() { selectrow2(this) };
所有测试浏览器均能触发click 事件
故为了兼容在不同的IE中,我们可以统一使用如下语句。
table2row1.onclick = function() { selectrow2(this) };
二、getAttribute的问题
elementNode为 <tr>...</tr>
先用setAttribute设置属性
table1row1.setAttribute("level", 1);
再用getAttribute来获取标签的属性值
var level = table1row1.getAttribute("level");
alert("table1row1 level:" + level + "\r\ntypeof(level) = " + (typeof (level)).toString());
在IE6,7 中显示
table1row1 level:1
typeof(level) = number
在IE8, Firefox, google chrome中显示
table1row1 level:1
typeof(level) = string
为统一处理此两种情况,代码统一如下:
var level = table1row1.getAttribute("level"); if (level === undefined || level == null) { level = "0"; } level = level.toString(); if (level.trim() == "") { level = "0"; }
或者使用ajax方法
$addHandler 是Sys.UI.DomEvent.addHandler 的快捷方式,它的语法为:
$addHandler(element, eventName, handler);
element 公开事件的 DOM 元素。
eventName 事件的名称。
handler 要添加的事件处理程序。
前面的语句可以写成这样:
$addHandler(row,"click", function() { selectrow(this) });
下面为测试的html代码
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>Test</title> <script type="text/javascript" language="javascript"> function pageLoad() { var table1row1 = document.getElementById("table1row1"); table1row1.setAttribute("level", 1); table1row1.setAttribute("onclick", "selectrow1(this)"); var table1row2 = document.getElementById("table1row2"); table1row2.setAttribute("level", 2); table1row2.setAttribute("onclick", "selectrow1(this)"); var table2row1 = document.getElementById("table2row1"); table2row1.setAttribute("level", 3); table2row1.onclick = function() { selectrow2(this) }; var table2row2 = document.getElementById("table2row2"); table2row2.setAttribute("level", 4); table2row2.onclick = function() { selectrow2(this) }; } var CurrentSelectRow1 = null; function selectrow1(newSelectRow) { if (CurrentSelectRow1 != null) { CurrentSelectRow1.style.backgroundColor = '#ffffff'; } newSelectRow.style.backgroundColor = 'PeachPuff'; CurrentSelectRow1 = newSelectRow; } var CurrentSelectRow2 = null; function selectrow2(newSelectRow) { if (CurrentSelectRow2 != null) { CurrentSelectRow2.style.backgroundColor = '#ffffff'; } newSelectRow.style.backgroundColor = '#ff0000'; CurrentSelectRow2 = newSelectRow; } function button1_click() { var table1row1 = document.getElementById("table1row1"); var level = table1row1.getAttribute("level"); var desc1 = "table1row1 level:" + level + "\r\ntypeof(level) = " + (typeof (level)).toString(); alert(desc1); var onclick1 = table1row1.getAttribute("onclick"); var desc2 = "table1row1 onclick:" + onclick1.toString() + "\r\ntypeof(onclick) = " + (typeof (onclick1)).toString(); alert(desc2); } function button2_click() { var table2row1 = document.getElementById("table2row1"); var level = table2row1.getAttribute("level"); var desc1 = "table2row1 level:" + level + "\r\ntypeof(level) = " + (typeof (level)).toString(); alert(desc1); var onclick1 = table2row1.onclick; var desc2 = "table2row1 onclick:" + onclick1.toString() + "\r\ntypeof(onclick) = " + (typeof (onclick1)).toString(); alert(desc2); } </script> </head> <body onload="pageLoad();"> <div style="width: 600px"> <span>table1</span> <table cellspacing="0" rules="all" border="1" id="table1" style="border-width: 1px; border-style: Solid; width: 100%; border-collapse: collapse;"> <tr id="table1row0"> <td align="center" style="width: 50%;"> No. </td> <td align="center" style="width: 50%;"> Item </td> </tr> <tr id="table1row1"> <td align="center" style="width: 50%;"> 1 </td> <td align="left" style="width: 50%;"> 2C.40E80.041 </td> </tr> <tr id="table1row2"> <td align="center" style="width: 50%;"> 2 </td> <td align="left" style="width: 50%;"> 4L.013Y2.003 </td> </tr> </table> <input type="button" id="button1" onclick="return button1_click();" /> </div> <div style="width: 600px"> <br /> <span>table2</span> <table cellspacing="0" rules="all" border="1" id="table2" style="border-width: 1px; border-style: Solid; width: 100%; border-collapse: collapse;"> <tr id="table2row0"> <td align="center" style="width: 50%;"> No. </td> <td align="center" style="width: 50%;"> Item </td> </tr> <tr id="table2row1"> <td align="center" style="width: 50%;"> 1 </td> <td align="left" style="width: 50%;"> 4G.0QE18.001 </td> </tr> <tr id="table2row2"> <td align="center" style="width: 50%;"> 2 </td> <td align="left" style="width: 50%;"> 2K.61209.208 </td> </tr> </table> <input type="button" id="button2" onclick="return button2_click();" /> </div> </body> </html>
javascript setAttribute, getAttribute 在不同浏览器上的不同表现
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