获取下拉列表值以在Alertbox中显示 [英] Get Dropdown List Value To Display In Alertbox
本文介绍了获取下拉列表值以在Alertbox中显示的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我是Javascript的新手。我需要在下拉列表中拉出状态值以显示在警告框中。下面是我的代码，但是当我点击提交按钮时，现在什么都没有出现。我不确定我做错了什么。您可以提供任何帮助。
I'm new to Javascript. I need to pull the state value in the drop down list to display in an alert box. Below is the code I have but now nothing appears when I hit the submit button. I'm not sure what I'm doing wrong. Any assistance you can offer would be appreciated.
<html>
<head>
<title>HTML and JavaScript</title>
<script>
function doSubmit()
{
// MD This runs the validate fieldes
if( ! (validateText() && validateZipCode() && validatePhoneNumber() && validateRadio() && validateCheck()) ) return false;
/* MD this generates the box message */
var fields=["customer", "address", "city", "state", "zip", "phone", "email","sizes"];
var fieldNames=["Name", "Address", "City", "State", "Zip", "Phone", "Email","Size"];
var msg = "";
for(i=0;i<fields.length;i++)
msg += fieldNames[i] + ": " + document.PizzaForm[ fields[i] ].value + "\n";
msg += "Toppings: ";
for(i=0;i<document.PizzaForm.toppings.length;i++)
if(document.PizzaForm.toppings[i].checked)
msg += (i==0?"":",")+document.PizzaForm.toppings[i].value;/* MD this displays the toppings from the check boxes in an alert box */
alert(msg);
var i = document.PizzaForm.states.options.selectedIndex;
var text = document.PizzaForm.states.options[i].text;
var value = document.PizzaForm.states.options[i].value;
msg += "State: ";
for(i=0;i<document.PizzaForm.states.length;i++)
if(document.PizzaForm.states[i].selected)
msg += (i==0?"":",")+document.PizzaForm.states[i].value;
alert(msg);
return true;
}
function validateText()
{
var pass=true;
var fields=["customer", "address", "city", "state", "zip", "phone"];
var fieldNames=["your name", "an address", "a city", "a state", "a zip code", "a phone number"]; /* MD this groups all the item headings */
for(i=0;i<fields.length;i++) /* MD this is the alert button for missing items */
if(document.PizzaForm[ fields[i] ].value.length == 0){
alert("Please enter " + fieldNames[i] + ".");
pass=false;
}
var email = document.PizzaForm["email"].value;/* MD This validates the email address */
atpos = email.indexOf("@"); dotpos = email.lastIndexOf(".");
if (atpos < 1 || ( dotpos - atpos < 2 )){alert("Please enter an email address.");pass=false;}
return pass;
}
function validateZipCode()
{
var zipDigit = document.PizzaForm.zip.value;
if(zipDigit != "") {
/* MD this is the regular expression for zip code patterns */
var regx = /^\d{5}$/;
if(regx.test(zipDigit) == false) { /* MD This is used if number does not match with the pattern */
alert("Please enter a 5 digit zip code.");
return false;
}
return true;
}
}
function validatePhoneNumber()
{
var phoneNum = document.PizzaForm.phone.value;
if(phoneNum != "") {
/* MD this is th regular expression for phone number patterns */
var regx = /(^\d{3}\-\d{3}\-\d{4}$)|(^\d{10}$)|(^\(\d{3}\)\d{7}$)|(^\(\d{3}\)\d{3}\-\d{4}$)/g;
if(regx.test(phoneNum) == false) { /* MD This is used if number does not match with the pattern */
alert("Please enter valid Phone number." + "\n\n" +
"For example : " + "\n" +
"012-345-6789 " + "\n" +
"0123456789 " + "\n" +
"(012)3456789 " + "\n" +
"(012)345-6789"
);
return false;
}
return true;
}
}
function validateRadio()
{
for(i=0;i<document.PizzaForm.sizes.length;i++)/* MD This validates the pizza size radio buttons */
if(document.PizzaForm.sizes[i].checked)
return true;
alert("Please choose a pizza size.");
return false;
}
function validateCheck()
{
for(i=0;i<document.PizzaForm.toppings.length;i++)/* MD This validates the pizza toppings check boxes */
if(document.PizzaForm.toppings[i].checked)
return true;
alert("Please pick a topping of your choice.");
return false;
}
</script>
</head>
<body>
<form name="PizzaForm">
<h1>The JavaScript Pizza Parlor</h1>
<p>
<h4>Step 1: Enter your name, address, and phone number:</h4>
<font face ="Courier New">
Name: <input name="customer" size="50" type="text"><br>
Address: <input name="address" size="50" type="text"><br>
City: <input name="city" size="15" type="text">
State: <select name="states">
<option 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>
Phone: <input name="phone" size="50" type="text"><br>
Email: <input name="email" size="40" type="text"><br>
</font>
</p>
<p>
<h4>Step 2: Select the size of pizza you want:</h4>
<font face="Courier New">
<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>
<h4>Step 3: Select the pizza toppings you want:</h4>
<font face="Courier New">
<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>
<input type="button" value="Submit Order" onClick="doSubmit()">
<input type="reset" value="Clear Entries"> <!-- MD This clears the entries -->
</form>
</body>
</html>推荐答案
/;
if(regx.test(zipDigit) == false) { /* MD This is used if number does not match with the pattern */
alert(\"Please enter a 5 digit zip code.\");
return false;
}
return true;
}
}
function validatePhoneNumber()
{
var phoneNum = document.PizzaForm.phone.value;
if(phoneNum != \"\") {
/* MD< span class=\"code-attribute\"> this is th regular expression for phone number patterns */
var regx = /(^\d{3}\-\d{3}\-\d{4}
/; if(regx.test(zipDigit) == false) { /* MD This is used if number does not match with the pattern */ alert("Please enter a 5 digit zip code."); return false; } return true; } } function validatePhoneNumber() { var phoneNum = document.PizzaForm.phone.value; if(phoneNum != "") { /* MD this is th regular expression for phone number patterns */ var regx = /(^\d{3}\-\d{3}\-\d{4}
)|(^\d{10}
)|(^\(\d{3}\)\d{7}
)|(^\(\d{3}\)\d{7}
这篇关于获取下拉列表值以在Alertbox中显示的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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