呵呵~！
我做的东西比较恶心
现在遇到了个问题就是input的radio控件响应事件问题
是这样：一个radio不光要响应被选中的事件，还要监听自己被撤销选中的事件
比如我有个选择题，A，B，C三个选项
用户在页面先选了A，根据某些业务逻辑，选了A以后是要进行一些相关操作的
但是这时候用户想了一下，觉得选A不好，改选B了
那么刚才根据用户选了A这一结果执行的操作，就要实现逆操作
我想设置radio的 onpropertychange事件来实现这个操作，但是发现把JavaScript方法注册到事件上以后
用户点中radio的时候，浏览器调用了2次该方法
而且似乎是在radio的checked属性被设置为true之前调用一次，设置为true之后调用一次
而当选了同组其他radio的时候，这个方法只执行了一次
很郁闷
所以来问问
有没有方法监听radio控件被选中和被撤销的事件啊？
谢谢大家了
回复讨论(解决方案)
换个思路。如果改选B，那么会触发事件。这样同样可以监听A撤消啊
试试 onclick
用一个全局变量记住当前选项
<html> <script language="javascript" defer="defer"> var cur;function check(){ var val; var rds = document.forms[0].rd; for(var i=0;i<rds.length;i++){ if(rds[i].checked){ val = i; break; } } if(val != cur){cur = val; alert("changed")}} window.onload=function(){ var rds = document.forms[0].rd; for(var i=0;i<rds.length;i++){ if(rds[i].checked){ cur = i; break; } }}</script> <body><form><input type="radio" name="rd" value="0" checked="checked" onclick="check()"> 0<br><input type="radio" name="rd" value="1" onclick="check()"> 1<br><input type="radio" name="rd" value="2" onclick="check()"> 2<br></form></body> </html>
<div id=radios> a <input type=radio name=a value=a > b <input type=radio name=a value=b> c <input type=radio name=a value=c></div><script language="javascript"><!--var obj=document.getElementById("radios").getElementsByTagName("input")for (var i=0;i<obj.length;i++){(function(k){obj[i].onclick=function(){cha(k)}})(i)}var lastChecked=nullfunction cha(k){if (lastChecked==k)returnif (lastChecked!=null){ //处理obj[lastChecked] alert("上次选中："+lastChecked)}lastChecked=k//处理obj[lastChecked]alert("本次选中："+lastChecked)}//--></script> 使用临时变量是不行的
因为页面上的选择题的数量，以及选择题和填空题
以及题目之间的跳转关系
比如：单选某一选项要跳转到哪个题
选择题之间选项的组合，选择题与填空题之间的组合
等等都是用户在设计试卷的时候指定的
不是写死在页面上的
变量可以动态创建，或用数组，不需要写死。
路过 学习
用一个全局变量记住当前选项
HTML code
<script> <br /> var cur; <br /> <br /> function check(){ <br /> var val; <br /> var rds = document.forms[0].rd; <br /> for(var i=0;i<rds.length;i++){ <br /> if(rds[i].checked){ <br /> val = i; <br /> break; <br /> } <br /> } <br /> if(val != cur){cur = val; alert("changed")} <br /> } <br /> window.onload=function(){ <br /> v… <br /> <br /> 正解！ </script>
打酱油
失去选中,也即失去焦点,那么失去焦点的事件可以在对象中这样响应
...onblur="javascript:workFunName(参数);"...
失去选中,也即失去焦点,那么失去焦点的事件可以在对象中这样响应
...onblur="javascript:workFunName(参数);"...
绝错~
你选Ａ选项以后，再去填一个空
然后回来看这个选择题，改成了选Ｂ，此时，Ａ失去选中，但不会触发失去焦点事件
我想的和２楼的思路一样
唉～
做一个调查问卷实在是太难了～
做了个测试
<!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><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title></title></head><body><form method="post" action=""> <input type="radio" name="ask1" id="a1" value="v1" />a1 <input type="radio" name="ask1" id="a2" value="v2" />a2 <input type="radio" name="ask1" id="a3" value="v3" />a3</form></body><script type="text/javascript">//<![CDATA[function a1(){ alert('a1 .... do something');}function a2(){ alert('a2 .... do something');}function a3(){ alert('a3 .... do something ');}function setradio(oname, v, fn){ var rdos = document.getElementsByName(oname); for ( var i=0,L=rdos.length; i<L; i++ ) { if ( rdos[i].value==v ) { rdos[i].onclick = function(){ fn(); }; } }}setradio('ask1', 'v1', a1);setradio('ask1', 'v2', a2);setradio('ask1', 'v3', a3);//]]></script></html> 恩!
谢谢大家
帖子结了
目前的思路是和xiaojing7的想法一样的
感谢大家的回复,以后有问题,我还会来骚扰大家的
谢谢
欢迎骚扰
真恶心
asdfadsasdf
function getRadio(obj) {
alert(obj.value);
var logon = document.getElementById("logon");
var reg = document.getElementById("reg");
}
1
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没事别动不东就自动执行 onload什么的
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