在检验表单输入时，为什么弹不出异常信息
日期：2014-05-16 浏览次数：20376 次
在检验表单输入时，为什么弹不出错误信息
<?xml version= "1.0 " encoding= "gb2312 "?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.1//EN "
"http://www.w3.org/TR/xhtml11/DTD//xhtml11.dtd ">
<html xmlns= "http://www.w3.org/1999/xhtml ">
<head>
<title> Illustrate password checking </title>
<script language= "javascript " type= "text/javascript " >
<!--
function chkPasswords(){
var init=document.ElementById( "initial ");
var sec=document.ElementById( "second ");
if(init.value== " "){
alert( "You did not enter a password\n "+ "Please enter one now ");
init.focus();
return false;
}
if(init.value!=sec.value){
alert( "The two passwords you entered are not the same\n "+ "Please re-enter both now ");
init.focus();
init.select();
return false;
}
else return true;
}
//-->
</script>
</head>
<body>
<h3> Password Input </h3>
<form id= "myForm " action= " ">
<p>
Your password
<input type= "password " id= "initial " size= "10 "/>
<br> <br>
Verify password
<input type= "password " id= "second " size= "10 "/>
<br> <br>
<input type= "reset " name= "reset "/>
<input type= "submit " name= "submit "/>
</p>
</form>
<script type= "text/javascript ">
<!--
document.getElementById( "second ").onblur=chkPasswords;
document.getElementById( "myForm ").onsubmit=chkPasswords;
//-->
</script>
</body>
</html>
------解决方案--------------------
<!DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.1//EN "
"http://www.w3.org/TR/xhtml11/DTD//xhtml11.dtd ">
<html xmlns= "http://www.w3.org/1999/xhtml ">
<head>
<title> Illustrate password checking </title>
<script language= "javascript " type= "text/javascript " >
<!--
function chkPasswords(){
var init=document.getElementById( "initial ");
var sec=document.getElementById( "second ");
if(init.value== " "){
alert( "You did not enter a password\n "+ "Please enter one now ");
init.focus();
return false;
}
if(init.value!=sec.value){
alert( "The two passwords you entered are not the same\n "+ "Please re-enter both now ");
init.focus();
init.select();
return false;
}
else return true;
}
//-->
</script>
</head>
<body>
<h3> Password Input </h3>
<form id= "myForm " action= " ">
<?xml version= "1.0 " encoding= "gb2312 "?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.1//EN "
"http://www.w3.org/TR/xhtml11/DTD//xhtml11.dtd ">
<html xmlns= "http://www.w3.org/1999/xhtml ">
<head>
<title> Illustrate password checking </title>
<script language= "javascript " type= "text/javascript " >
<!--
function chkPasswords(){
var init=document.ElementById( "initial ");
var sec=document.ElementById( "second ");
if(init.value== " "){
alert( "You did not enter a password\n "+ "Please enter one now ");
init.focus();
return false;
}
if(init.value!=sec.value){
alert( "The two passwords you entered are not the same\n "+ "Please re-enter both now ");
init.focus();
init.select();
return false;
}
else return true;
}
//-->
</script>
</head>
<body>
<h3> Password Input </h3>
<form id= "myForm " action= " ">
<p>
Your password
<input type= "password " id= "initial " size= "10 "/>
<br> <br>
Verify password
<input type= "password " id= "second " size= "10 "/>
<br> <br>
<input type= "reset " name= "reset "/>
<input type= "submit " name= "submit "/>
</p>
</form>
<script type= "text/javascript ">
<!--
document.getElementById( "second ").onblur=chkPasswords;
document.getElementById( "myForm ").onsubmit=chkPasswords;
//-->
</script>
</body>
</html>
------解决方案--------------------
<!DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.1//EN "
"http://www.w3.org/TR/xhtml11/DTD//xhtml11.dtd ">
<html xmlns= "http://www.w3.org/1999/xhtml ">
<head>
<title> Illustrate password checking </title>
<script language= "javascript " type= "text/javascript " >
<!--
function chkPasswords(){
var init=document.getElementById( "initial ");
var sec=document.getElementById( "second ");
if(init.value== " "){
alert( "You did not enter a password\n "+ "Please enter one now ");
init.focus();
return false;
}
if(init.value!=sec.value){
alert( "The two passwords you entered are not the same\n "+ "Please re-enter both now ");
init.focus();
init.select();
return false;
}
else return true;
}
//-->
</script>
</head>
<body>
<h3> Password Input </h3>
<form id= "myForm " action= " ">
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