解决了我的javascript问题。对不起，这主要是我的错，因为我复制并粘贴了我的代码而不是重写它。奇怪的是，它似乎没有将变量从表单传递到进程页面，因为我已经回复了SQL语句。这个表单以前对java脚本起作用，我添加的所有内容都是Post Code：对于每一行甚至在删除javascript之后它仍然不起作用：S 明天对不起截止日期，我很吃惊。
<script type="text/javascript">
function checkForm()
{
var username = document.getElementById('username').value;
if(username.length < 5)
{
alert("Username is to short");
return false;
}
else if (username.length<16)
{
alert("Username is to long");
return false;
}
var firstName = document.getElementById('firstName').value;
if(firstName.length <3)
{
alert("Forname is to short");
return false;
}
var lastName = document.getElementById('lastName').value;
if (lastName.length <3)
{
alert("Surname is to short");
return false;
}
var address = document.getElementById('address').value;
if (address.length <8)
{
alert("Address is to short");
return false;
}
var town = document.getElementById('town').value;
if (town.length <3)
{
alert ("Town is to short");
return false;
}
var postCode = document.getElementById('postCode').value;
if (postCode.length <6)
{
alert ("Invalid Post Code");
return false;
}
else if (postCode.length>8)
{
alert("Invalid Post Code");
return false;
}
var cardType = document.getElementById('cardType').value;
if (cardType.length <3)
{
alert ("Please enter a valid card type");
return false;
}
var password = document.getElementById('password').value;
if (password.length <6)
{
alert ("You password must be between 6-12 characters");
return false;
}
else if(password.length>12)
{
alert ("Your password must be between 6-12 characters");
return false;
}
else
{
return true;
}
}
function checkUsername()
{
var username = document.getElementById('username').value;
var element = document.getElementById('username1');
if(username.length < 5)
{
element.innerHTML = "Username is to short";
element.style.color = "red";
}
else if (username.length >16)
{
element.innerHTML = "Username is to long";
element.style.color = "red";
}
else
{
element.innerHTML = "Username";
element.style.color = "green";
}
}
function checkFname()
{
var firstName = document.getElementById('firstName').value;
var element = document.getElementById('firstname1');
if(firstName.length < 3)
{
element.innerHTML = "Forname is to short";
element.style.color = "red";
}
else
{
element.innerHTML = "Forname";
element.style.color = "green";
}
}
function checkLname()
{
var lastName = document.getElementById('lastName').value;
var element = document.getElementById('surname1');
if(lastName.length < 3)
{
element.innerHTML = "Surname is to short";
element.style.color = "red";
}
else
{
element.innerHTML = "Surname";
element.style.color = "green";
}
}
function checkAddress()
{
var address = document.getElementById('address').value;
var element = document.getElementById('address1');
if(address.length < 8)
{
element.innerHTML = "Address is to short";
element.style.color = "red";
}
else
{
element.innerHTML = "Address";
element.style.color = "green";
}
}
function checkTown()
{
var town = document.getElementById('town').value;
var element = document.getElementById('town1');
if(town.length < 3)
{
element.innerHTML = "Town is to short";
element.style.color = "red";
}
else
{
element.innerHTML = "Town";
element.style.color = "green";
}
}
function checkPostCode()
{
var postCode = document.getElementById('postCode').value;
var element = document.getElementById('postcode1');
if(postCode.length < 6)
{
element.innerHTML = "Post code is to short";
element.style.color = "red";
}
else if (postCode.length>8)
{
element.innerHTML = "Post Code To Long";
element.style.color = "red";
}
else
{
element.innerHTML = "Post Code";
element.style.color = "green";
}
}
function checkCard()
{
var cardType = document.getElementById('cardType').value;
var element = document.getElementById('card1');
if(cardType.length < 3)
{
element.innerHTML = "Card is to short";
element.style.color = "red";
}
else
{
element.innerHTML = "Card Type";
element.style.color = "green";
}
}
function checkPassword()
{
var password = document.getElementById('password').value;
var element = document.getElementById('password1');
if(password.length < 6)
{
element.innerHTML = "Password is to short";
element.style.color = "red";
}
else if (password.length>16)
{
element.innerHTML = "Password is to long";
element.style.color = "red";
}
else
{
element.innerHTML = "Password";
element.style.color = "green";
}
}
</script>
<p><b><h3>Welcome User Please Register</h3></b></p>
<form action="registerUserProcess.php" id="registerUserForm" method="post" name="registerUserForm" >
<table>
<tr><td><label id="username1">Username:</label></td><td><input id="username" type="text" size="16" onBlur='checkUsername();'/></td></tr>
<tr><td><label id="firstname1">Forename:</label></td><td><input id="firstName" type="text" size="20" onBlur="checkFname();" /></td></tr>
<tr><td><label id="surname1">Surname:</label></td><td><input id="lastName" type="text" size="30" onBlur="checkLname();" /></td></tr>
<tr><td><label id="address1">Address:</label></td><td><input id="address" type="text" size="50" onBlur="checkAddress();" /></td></tr>
<tr><td></td><td><input id="address2" type="text" size="50" onBlur="" /></td></tr>
<tr><td><label id="town1">Town:</label></td><td><input id="town" type="text" size="50" onBlur="checkTown();" /></td></tr>
<tr><td><label id="postcode1">Post Code:</label></td><td> <input type="text" id="postCode" size="8" onBlur="checkPostCode();" /></td></tr>
<tr><td><label id="contact1">Contact No:</label></td><td> <input type="number" id="contact" size="12" onBlur="checkContactNo();" /></td></tr>
<tr><td>Card Number:</td><td><input type="number" id="cardNo1" size="4" /> - <input type="number" id="cardNo2" size="4" /> - <input type="number" id="cardNo3" size="4" /> - <input type="number" id="cardNo4" size="4" /></td></tr>
<tr><td><label id="card1">Card Type</label></td><td> <input type="text" id="cardType" size="8" onBlur="checkCard();" /></td></tr>
<tr><td>Email Address:</td><td><input id="emailAddress" type="text" size="50" /></td></tr>
<tr><td><label id="password1">Password:</label></td><td><input id="password" type="password" size="16" onBlur="checkPassword();" /></td></tr>
<tr><td><label id="terms1">Accept Terms & Conditions:</label></td><td><input type="checkbox" id="termsConditions" value="yes" onBlur="checkTerms();" /></td></tr>
<tr><td><input type="reset" id="resetForm" value="Reset" id="resetForm" /></td><td><input type="submit" id="submitUser" value="Submit" id="submitUser" onSubmit='return checkForm();' /></td></tr>
</table>
</form>
答案 0 :(得分：1)
功能：checkForm（）：
如果要：
，您需要更改第二个else if (username.length<16)) needs to be > 16.
-
功能：checkUsername（）：
你拼写错误的长度。将其更改为：
else if (username.length>16)
答案 1 :(得分：1)
这个问题的代码太多了，但我注意到第一个函数中的一些内容：
else if (username.length<16) // This should probably be username.length > 16
{
alert("Username is to long");
return false;
}
if (isNAN(contact)) // this should probably be !isNaN(contact)
{
return true;
}
答案 2 :(得分：1)
以下拼写错误：username.lenght>16
这就是你太久没有工作的原因。
function checkUsername()
{
var username = document.getElementById('username').value;
var element = document.getElementById('username1');
if(username.length < 5)
{
element.innerHTML = "Username is to short";
element.style.color = "red";
}
else if (username.lenght>16)
{
element.innerHTML = "Username is to long";
element.style.color = "red";
}
else
{
element.style.color = "green";
}
}
答案 3 :(得分：1)
正如其他人所说，检查你的语法。在checkform()中，它应该是
else if (username.length > 16)) instead of < 16
并在checkUsername()中拼错了长度。
但你的主要问题在于你的回报。在checkform()中，您只应在验证完所有内容后将return true放在最后，否则该函数会在第一次验证后退出。
你也可以重构所有这些。你有很多功能几乎可以做同样的事情。如果你创建一个函数，它使用最少的字符，最大字符和控件来验证参数，你可以用20到30行代码完成所有代码。
另外，似乎您在不更改变量名称或目标控件的情况下复制粘贴了一些函数。实际上，您在每个函数中将Username指定为变量，但在条件中更改名称，这意味着您使用了取消分配变量。