如何打印每个单词的首字母大写的用户输入?
How do I print user input with the first letter of each word capitalized?
我正在使用一个表单，并且希望打印用户输入的每个单词的第一个字母大写，无论他们如何键入它。例如，我希望将用户的"ronALd SmItH"打印为ronALd SmItH。我也想这样做的地址和城市。我已经阅读了这里所有类似的问题和答案，它们对我不起作用。我不确定我是否把我的代码放在错误的地方，或者我做错了什么。这是我使用的代码:
function correctFormat(customer)
{
var first = customer.charAt(0).toUpperCase();
var rest = customer.substring(1).toLowerCase();
return first + rest;
}
我试过把它放在整个文档中的各种地方，我试过重命名字符串(例如:姓名、城市、地址)。我也读了这里的其他帖子，看起来和这个问题一样，但没有一个是有效的。我没有输入我想要大写的字符串。用户正在将他们的数据输入到表单中，我需要它以正确的格式打印警报。下面是整个文档中的上述代码。很抱歉这么久才回来，我又一次不知所措。
<html>
<!--nff Add a title to the Web Page.-->
<head>
<title>Pizza Order Form</title>
<script>
/*nff Add the doClear function to clear the information entered by the user and enter the information to be cleared when the clear entries button is clicked at the bottom of the Web Page.*/
function doClear()
{
var elements = document.getElementsByTagName('select');
elements[0].value = 'PA';
document.PizzaForm.customer.value = "";
document.PizzaForm.address.value = "";
document.PizzaForm.city.value = "";
document.PizzaForm.state.value = "";
document.PizzaForm.zip.value = "";
document.PizzaForm.phone.value = "";
document.PizzaForm.email.value = "";
document.PizzaForm.sizes[0].checked = false;
document.PizzaForm.sizes[1].checked = false;
document.PizzaForm.sizes[2].checked = false;
document.PizzaForm.sizes[3].checked = false;
document.PizzaForm.toppings[0].checked = false;
document.PizzaForm.toppings[1].checked = false;
document.PizzaForm.toppings[2].checked = false;
document.PizzaForm.toppings[3].checked = false;
document.PizzaForm.toppings[4].checked = false;
document.PizzaForm.toppings[5].checked = false;
document.PizzaForm.toppings[6].checked = false;
document.PizzaForm.toppings[7].checked = false;
document.PizzaForm.toppings[8].checked = false;
return;
}
//nff Add a doSubmit button to indicate what the outcome will be when the user clicks the submit order button at the bottom of the form.
function doSubmit()
/*nff Add an if statement to the doSubmit function to return false if there is missing information in the text fields once the user clicks the submit order button.*/
{
if (validateText() == false) {
return false;
}
//nff Add an if statement to the doSubmit function to return false if there is no pizza size selected using the radio buttons.
if (validateRadio() == false) {
return false;
}
//nff Add an if statement to the doSubmit function to return false if there are no toppings selected using the checkboxes.
if (validateCheckbox() == false) {
return false;
}
//nff Add an if statement to the doSubmit function to return false if the email entered by the user is empty or does not fit the acceptable format.
if (validateEmail() == false) {
return false;
}
/*nff Add an if statement to the doSubmit function to return false if the phone number entered by the user is empty or does not fit the acceptable formats.*/
if (validatePhone() == false) {
return false;
}
if (validateZip() == false) {
return false;
}
//nff Add an alert box to show customer information from text fields when the Submit Order button is clicked.
var customer = document.PizzaForm.customer.value;
var address = document.PizzaForm.address.value;
var city = document.PizzaForm.city.value;
var state = document.PizzaForm.state.value;
var zip = document.PizzaForm.zip.value;
var phone = document.PizzaForm.phone.value;
var email = document.PizzaForm.email.value;
var size = "";
for (var i = 0; i < document.PizzaForm.sizes.length; i++) {
if (document.PizzaForm.sizes[i].checked) {
size = document.PizzaForm.sizes[i].nextSibling.nodeValue.trim();
break;
}
}
var toppings = [];
for (var i = 0; i < document.PizzaForm.toppings.length; i++) {
if (document.PizzaForm.toppings[i].checked) {
toppings.push(document.PizzaForm.toppings[i].nextSibling.nodeValue.trim());
}
}
alert("Name: " + customer + ''n' +
"Address: " + address + ''n' +
"City: " + city + ''n' +
"State: " + state + ''n' +
"Zip: " + zip + ''n' +
"Phone: " + phone + ''n' +
"Email: " + email + ''n' +
"Size: " + size + ''n' + (toppings.length ? 'Toppings: ' + toppings.join(', ') : ''));
}
//nff Add the validateText function to ensure that all text fields are complete before the order is submitted.
function validateText() {
var customer = document.PizzaForm.customer.value;
if (customer.length == 0) {
alert('Name data is missing');
document.PizzaForm.customer.focus();
return false
};
var address = document.PizzaForm.address.value;
if (address.length == 0) {
alert('Address data is missing');
return false;
}
var city = document.PizzaForm.city.value;
if (city.length == 0) {
alert('City data is missing');
return false;
}
var state = document.PizzaForm.state.value;
if (state.length == 0) {
alert('State data is missing');
return false;
}
var zip = document.PizzaForm.zip.value;
if (zip.length == 0) {
alert('Zip data is missing');
return false;
}
var phone = document.PizzaForm.phone.value;
if (phone.length == 0) {
alert('Phone data is missing');
return false;
}
var email = document.PizzaForm.email.value;
if (email.length == 0) {
alert('Email data is missing');
return false;
}
return true;
}
//nff Add the validateRadio function so that if none of the radio buttons for pizza size are selected it will alert the user.
function validateRadio() {
if (document.PizzaForm.sizes[0].checked) return true;
if (document.PizzaForm.sizes[1].checked) return true;
if (document.PizzaForm.sizes[2].checked) return true;
if (document.PizzaForm.sizes[3].checked) return true;
alert('Size of pizza not selected');
document.PizzaForm.sizes[0].foucs();
return false;
}
//nff Add the validateCheckbox function so that if none of the checkboxes for toppings are selected it will alert the user.
function validateCheckbox() {
if (document.PizzaForm.toppings[0].checked) return true;
if (document.PizzaForm.toppings[1].checked) return true;
if (document.PizzaForm.toppings[2].checked) return true;
if (document.PizzaForm.toppings[3].checked) return true;
if (document.PizzaForm.toppings[4].checked) return true;
if (document.PizzaForm.toppings[5].checked) return true;
if (document.PizzaForm.toppings[6].checked) return true;
if (document.PizzaForm.toppings[7].checked) return true;
if (document.PizzaForm.toppings[8].checked) return true;
alert ('Toppings are not selected');
return false;
}
//nff Add the validateEmail function to ensure that the email address has been entered in the correct format.
function validateEmail() {
if (/^'w+(['.-]?'w+)*@'w+(['.-]?'w+)*('.'w{3,4})+$/.test(PizzaForm.email.value))
{
return (true)
}
alert("You have entered an invalid email address")
return (false)
}
//nff Add the validatePhone function to ensure that the phone number has been entered in any of the acceptable formats.
function validatePhone() {
if (/^[(]{0,1}[0-9]{3}[)]{0,1}[-'s'.]{0,1}[0-9]{3}[-'s'.]{0,1}[0-9]{4}$/.test(PizzaForm.phone.value))
{
return (true)
}
alert("You have entered an invalid phone number")
return (false)
}
function validateZip() {
if (/^'d{5}(['-]'d{4})?$/.test(PizzaForm.zip.value))
{
return (true)
}
alert("You have entered an invalid zip")
return (false)
}
function correctFormat(customer)
{
var first = customer.charAt(0).toUpperCase();
var rest = name.substring(1).toLowerCase();
return first + rest;
}
</script>
</head>
<body>
<!--nff Add a form for the user to enter information into.-->
<form name="PizzaForm">
<!--nff add a title at the top of the Web Page-->
<h1>The JavaScript Pizza Parlor</h1>
<!--nff add directions to the user for the information to be entered-->
<p>
<h4>Step 1: Enter your name, address, and phone number:</h4>
<!--nff change the font-->
<font face="Courier New">
<!--nff insert a text field for user to enter their name, add spaces between the title of the text box and the box itself, specify the size of the input box, and the type of input into the box as text.-->
Name: <input name="customer" size="50"
type="text"><br>
<!--nff insert a text field for user to enter their address, specify the size of the input box, and the type of input into the box as text.-->
Address: <input name="address" size="50" type="text"><br>
<!--nff Insert a text field for user to enter their city, add spaces between the title of the text box and the box itself, specify the size of the input box, and the type of input into the box as text.-->
City: <input name="city" size="15" type="text">
<!--nff Insert text fields for the user to enter their state and zip, specify the sizes of the input boxes, and specify that the text to be entered into the boxes will be in all caps for the state box. These input boxes should be on the same line as the last one.-->
State:<select name="state">
<option selected value="PA">PA</option>
<option value="NJ">NJ</option>
<option value="NY">NY</option>
<option value="DE">DE</option>
</select>
Zip: <input name="zip" size="5" type="text"><br>
<!--nff Insert a text field for the user to enter their phone number, insert spaces after the title of the box, specify the size of the box, and the type of input as text.-->
Phone: <input name="phone" size="50" type="text"><br>
<!--nff Insert a text field for the user to enter their email address, insert spaces after the title of the box, specify the size of the box, and the type of input as text.-->
Email: <input name="email" size="50" type="text"><br>
</font>
</p>
<!--nff add second step to order a pizza-->
<p>
<h4>Step 2: Select the size of pizza you want:</h4>
<font face="Courier New">
<!--nff Add radio buttons to choose from four options for pizza sizes.-->
<input name="sizes" type="radio" value="small">Small
<input name="sizes" type="radio" value="medium">Medium
<input name="sizes" type="radio" value="large">Large
<input name="sizes" type="radio" value="jumbo">Jumbo<br>
</font>
</p>
<p>
<!--nff add third step to order a pizza-->
<h4>Step 3: Select the pizza toppings you want:</h4>
<font face="Courier New">
<!--nff Add check boxes for user to choose toppings.-->
<input name="toppings" type="checkbox" value="pepperoni">Pepperoni
<input name="toppings" type="checkbox" value="canadian bacon">Canadian Bacon
<input name="toppings" type="checkbox" value="sausage">Sausage<br>
<input name="toppings" type="checkbox" value="mushrooms">Mushrooms
<input name="toppings" type="checkbox" value="pineapple">Pineapple
<input name="toppings" type="checkbox" value="black olives">Black Olives<br>
<input name="toppings" type="checkbox" value="green peppers">Green Peppers
<input name="toppings" type="checkbox" value="extra cheese">Extra Cheese
<input name="toppings" type="checkbox" value="none">None<br>
</font>
</p>
<!--nff Add buttons for the options to submit order or clear entries. Add an onClick event to show one of the alerts entered earlier in this document when the submit button is clicked at the bottom of the Web Page. Add and onClick event to clear the entries in this form upon clicking the clear entries button.-->
<input type="button" value="Submit Order" onClick="doSubmit()">
<input type="button" value="Clear Entries" onClick="doClear()">
</form>
</body>
</html>
您可以使用正则表达式，例如:
function correctFormat(customer){
return customer.replace(/'b(.)(.*?)'b/g, function(){
return arguments[1].toUpperCase() + arguments[2].toLowerCase();
});
}
您的函数只大写字符串的第一个字母，而不是每个单词的第一个字母。您可以尝试使用string.split(' '):
function correctFormat(customer)
{
if (customer == null || customer.length == 0)
return customer;
var words = customer.split(/'s+/g);
for (var i = 0; i < words.length; ++i) {
var first = words[i].charAt(0).toUpperCase();
var rest = words[i].substring(1).toLowerCase();
words[i] = first + rest;
}
return words.join(' ');
}
我还注意到你没有在任何地方调用correctFormat。您需要调用函数才能执行它。例如:
var customer = correctFormat(document.PizzaForm.customer.value);
正如@Wee You所提到的，您使用customer作为第一个字母，但使用name作为其余字母。你必须用用户输入调用这个函数，然后用正确的格式更新dom中的文本。
function correctFormat(str)
{
var first = str.charAt(0).toUpperCase();
var rest = str.substring(1).toLowerCase();
return first + rest;
}
下面是你需要的一小段代码:将每个名称部分传递给.replace()方法:
var PizzaForm = document.PizzaForm;
var customer = PizzaForm.customer;
function formatName() {
this.value = this.value.replace(/([^ 't]+)/g, function(_, str) {
var A = str.charAt(0).toUpperCase();
var bc = str.substring(1).toLowerCase();
return A + bc;
});
}
customer.addEventListener("input", formatName);<form name="PizzaForm">
Name: <input name="customer" size="50" type="text">
</form>也适用于粘贴。玩得开心
PS:为什么不使用PizzaForm.reset();
doClear(){代码墙呢?试试这个函数
function correctFormat(customer)
{
var upperText = customer.toLowerCase();
var result = upperText.charAt(0).toUpperCase();
for(var i=1;i<upperText.length;i++)
if(upperText.charAt(i-1) == ' ')
result += upperText.charAt(i).toUpperCase();
else
result += upperText.charAt(i);
return result;
}
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