我试图弄清楚为什么表单的“提交此表单”按钮没有将我带到我在 <form ... action="submit form.html" method="get"> 中指定的另一个 HTML 页面。属性，不仅如此，当我输入错误的名字、电子邮件地址、订单号和订单日期时，它不会返回我使用 JavaScript 在 if-else 代码中指定的 JavaScript 消息。
这是我在表单上使用的 JavaScript 代码。
var $ = function (id)
{
return document.getElementById(id);
}
var submitForm = function()
{
var FirstName= $("firstName").value;
var OrderNumber= $("orderNumber").value;
var DateOfOrder= $("date_of_order").value;
var emailAddress= $("email_address").value;
var isValid=true;
if(FirstName !== "Cherry", "Micheal", "Sandra", "Cookie")
{
$("firstname_error").firstChild.nodeValue=
"This person does not exist.";
isValid=false;
} else{ $("firstname_error").firstChild.nodeValue="";}
if(OrderNumber !== 3134, 4234, 9234, 3566)
{
$("orderNumber_error").firstChild.nodeValue="Invalid Order Number.";
isValid=false;
} else{ $("orderNumber_error").firstChild.nodeValue="";}
if(DateOfOrder !=='12-07-23', '15-04-24', '16-02-01', '14-01-12')
{
$("date_of_order_error").firstChild.nodeValue="Date doesn't exist in
system";
isValid=false;
} else{ $("date_of_order_error").firstChild.nodeValue="";}
if(emailAddress !="cherryjackson@gmail.com", "michealroberts@yahoo.com",
"sandrabell@hotmail.com", "cookiedanny@outlook.com")
{
$("email_address_error").firstChild.nodeValue="The email doesn't exist";
isValid=false;
} else{ $("email_address_error").firstChild.nodeValue="";}
if(isValid)
{
//submit the form if all entries are valid
$("cookie_form").submit();
}
}
window.onload = function()
{
$("form_submission").onclick = submitForm;
$("email_address").focus();
}body{
background-color:#FBFBE8;
}
/* Tells HTML5 to find the font-type-face that my OS has and then use that for heading 1
and also centers the first heading */
h1{
font-family:Arial, Helvetica, sans-serif;
text-align:center;
}
/* Tells HTML5 to use any of the font-types for my first paragraph in HTML source file
if one is not available. Also clears some white space
from the left margin of the paragraph and finally tells it to give that paragraph
a size of 20 pixels. */
p{
font-family:Arial, Helvetica, sans-serif;
padding: 20px;
font-size:20px;
}
label{
float: left;
width: 11em;
text-align: right;
font-family:Arial, Helvetica, sans-serif;
color:#800000;
}
input{
margin-left: 1em;
margin-bottom:.5em;
}
span{
color: red;
}
.field_set_1{
border-color: purple;
border-style: solid;
}
#form_submission{
background-color:black; color:white;
}
legend{
font-family:Arial, Helvetica, sans-serif;
color:blue;
}
/* All of the classes are just for positioning and floating the four
same images around the form input information */
.Wrap1{
float:right;
margin:40px;
width:200px;
height:200px;
}
.Wrap2{
float:left;
margin:40px;
width:200px;
height:200px;
}
.clearfix {
clear: both;
}<!DOCTYPE html>
<html>
<head>
<title>Cookie Order Form </title>
<link rel="stylesheet" href="First_Design.css">
<script src="cookieform.js"></script>
</head>
<body>
<h1>Cookie Order Form</h1>
<p>This form is a cookie order form for customers that purchased cookies from
Daron's Cookies Company and the following below must be filled out in order for each
customer to receive a final message that tells them when their order will be ready.</p>
<IMG class="Wrap1" SRC="cookie.gif" alt="cookie">
<IMG class="Wrap2" SRC="cookie.gif" alt="cookie2">
<!--The customer will be sent to the HTML page named "submit form.html" after they
click the "Submit this Form" button. The code below does this. -->
<div>
<form id="cookie_form" name="cookie_form" action="submit form.html" method="get">
<fieldset class="field_set_1">
<!-- Below sets the title of the form-->
<legend>Customer Order Form Information:</legend>
<!-- Creates the first left label to specify what should be placed in the text box
the the right of the label. The rest below does the same.-->
<label for="firstName">First Name:</label>
<input type="text" id="firstName" name="firstName">
<span id="firstname_error">*</span><br>
<label for="orderNumber">Order Number:</label>
<input type="text" id="orderNumber" name="orderNumber">
<span id="orderNumber_error">*</span><br>
<label for="date_of_order">Date of Order:</label>
<input type="text" id="date_of_order" name="date_of_order">
<span id="date_of_order_error">*</span><br>
<label for="email_address">Email Address:</label>
<input type="text" id="email_address" name="email_address">
<span id="email_address_error">*</span><br>
<label> </label>
<input type="button" id="form_submission" value="Submit this Form">
</fieldset>
</form>
</div>
<div class="clearfix">
</div>
<IMG class="Wrap1" SRC="cookie.gif" alt="cookie">
<IMG class="Wrap2" SRC="cookie.gif" alt="cookie2">
</body>
</html>最佳答案
您的代码存在很多问题，但最大的是您的验证测试，每个测试都遵循相同的结构:
if(FirstName !== "Cherry", "Micheal", "Sandra", "Cookie")
您无法针对以逗号分隔的值列表来测试 firstName。每一个都必须单独测试，并且必须在它们之间使用复合逻辑运算符:
if(FirstName !== "Cherry" && FirstName !== "Micheal" &&
FirstName !== "Sandra" && FirstName !== "Cookie")
您还使用了标准按钮，而不是提交按钮，这可能会导致在某些情况下按下 ENTER 键时绕过所有验证。始终使用提交按钮并在 submit 事件中进行验证。
请参阅我重组和重新组织的代码解决方案以获取内联注释。
The Stack Overflow snippet environment (below) doesn't work with forms (because it's sandboxed), but the same code can be run here.
// W3C DOM Event model instead of node event properties:
window.addEventListener("DOMContentLoaded", function() {
// Since we're now using the submit event, we hook into that event:
// Use camelCase for JavaScript identifiers
var form = getElem("cookieForm");
form.addEventListener("submit", validate);
getElem("emailAddress").focus();
// Opening curly braces should appear on the same line as the declaration they open
// Dollar signs are legal identifiers, but usually denote libraries (like JQuery) and
// can be confusing if you are not using those libraries.
function getElem (id) {
return document.getElementById(id);
}
function validate(evt) {
var inputs = document.querySelectorAll(".validate");
// It's better logic to assume false, which avoids "false positives"
var isValid = false;
// Loop through the fields that need validation
for (var i = 0; i < inputs.length; ++i){
var message = ""; // This is the potential error message
// Validate the input according to its id:
switch (inputs[i].id) {
case "firstName" :
// You can't check a single value against a comma-separated list, you have to check
// it against each value you are interested in:
isValid = (inputs[i].value !== "Cherry" && inputs[i].value !== "Micheal" &&
inputs[i].value !== "Sandra" && inputs[i].value !== "Cookie") ? false : true;
message = (!isValid) ? "This person does not exist." : "";
break;
case "orderNumber" :
// Remember, HTML form fields always return strings, not numbers
isValid = (inputs[i].value !== "3134" && inputs[i].value !== "4234" &&
inputs[i].value !== "9234" && inputs[i].value !== "3566") ? false : true;
message = (!isValid) ? "Invalid Order Number." : "";
break;
case "dateOfOrder" :
isValid = (inputs[i].value !=='12-07-23' && inputs[i].value !== '15-04-24' &&
inputs[i].value !== '16-02-01' && inputs[i].value !== '14-01-12') ? false : true;
message = (!isValid) ? "Date doesn't exist in system" : "";
break;
case "emailAddress" :
isValid = (inputs[i].value != "cherryjackson@gmail.com" &&
inputs[i].value !== "michealroberts@yahoo.com" &&
inputs[i].value !== "sandrabell@hotmail.com" &&
inputs[i].value !== "cookiedanny@outlook.com") ? false : true;
message = (!isValid) ? "The email doesn't exist" : "";
break;
}
// Update the UI with the correct message:
inputs[i].nextElementSibling.textContent = message;
}
if(!isValid) {
// cancel the submission if we're invalid
evt.preventDefault(); // Cancel the form's submission
evt.stopPropagation(); // Don't bubble the event
}
}
});body{
background-color:#FBFBE8;
}
/* Tells HTML5 to find the font-type-face that my OS has and then use that for heading 1
and also centers the first heading */
h1{
font-family:Arial, Helvetica, sans-serif;
text-align:center;
}
/* Tells HTML5 to use any of the font-types for my first paragraph in HTML source file
if one is not available. Also clears some white space
from the left margin of the paragraph and finally tells it to give that paragraph
a size of 20 pixels. */
p {
font-family:Arial, Helvetica, sans-serif;
padding: 20px;
font-size:20px;
}
label{
float: left;
width: 11em;
text-align: right;
font-family:Arial, Helvetica, sans-serif;
color:#800000;
}
input{
margin-left: 1em;
margin-bottom:.5em;
}
span {
color: red;
}
.field_set_1{
border-color: purple;
border-style: solid;
}
#form_submission{ background-color:black; color:white; }
legend{
font-family:Arial, Helvetica, sans-serif;
color:blue;
}
/* All of the classes are just for positioning and floating the four
same images around the form input information */
.Wrap1{
float:right;
margin:40px;
width:200px;
height:200px;
}
.Wrap2{
float:left;
margin:40px;
width:200px;
height:200px;
}
.clearfix {
clear: both;
}<form id="cookieForm" name="cookieForm" action="submit form.html" method="get">
<fieldset class="field_set_1">
<!-- Below sets the title of the form-->
<legend>Customer Order Form Information:</legend>
<!-- Creates the first left label to specify what should be placed in the text box
the the right of the label. The rest below does the same.-->
<label for="firstName">First Name:</label>
<input type="text" id="firstName" name="firstName" class="validate">
<span id="firstname_error">*</span><br>
<label for="orderNumber">Order Number:</label>
<input type="text" id="orderNumber" name="orderNumber" class="validate">
<span id="orderNumber_error">*</span><br>
<label for="dateOfOrder">Date of Order:</label>
<input type="text" id="dateOfOrder" name="dateOfOrder" class="validate">
<span id="dateOfOrder_error">*</span><br>
<label for="emailAddress">Email Address:</label>
<input type="text" id="emailAddress" name="emailAddress" class="validate">
<span id="emailAddress_error">*</span><br>
<label> </label>
<!-- Always use a "submit" button to initiate form submission, even
if there will be form validation -->
<input type="submit" id="form_submission" value="Submit this Form">
</fieldset>
</form>关于javascript - 为什么当我点击表单提交按钮时，它不会进入下一页？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/42031319/