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私はちょうどこのチェックフォームの検証をしようとしています。フォームが提出されない限り、すべてが満たされないと、それが機能する場合にのみ合計が行われます。私はこれが初めてで、何が起こっているのか分かりませんが、デフォルトでは画面の上部に青色のボックスが表示されています。 HTML：フォームの検証？
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Hands-on Project 6 - Order</title>
<link rel="stylesheet" href="styles.css">
<script src="script.js"></script>
</head>
<body>
<section>
<article>
<h2>Pizza Order Form</h2>
<div id="errorMessage">
</div>
<form action="results.html" id="orderForm">
<input type="hidden" name="hidden" id="hidden">
<fieldset>
<legend>Delivery Information</legend>
<label for="nameinput">Name</label>
<input type="text" id="nameinput" name="name">
<label for="addrinput">Street Address</label>
<input type="text" id="addrinput" name="address">
<label for="cityinput">City</label>
<input type="text" id="cityinput" name="city">
<label for="emailinput">Email</label>
<input type="email" id="emailinput" name="email">
<label for="phoneinput">Phone</label>
<input type="tel" id="phoneinput" name="phone">
</fieldset>
<fieldset>
<legend>Order</legend>
<p>
<span class="nonLabel">What type of crust:</span>
<br>
<input type="radio" name="crust" id="thin" value="1">
<label for="thin">Thin Crust</label>
<input type="radio" name="crust" id="original" value="0">
<label for="original">Original Crust</label>
<input type="radio" name="crust" id="thick" value="3">
<label for="thick">Deep Dish</label>
</p>
<label for="size" class="nonLabel">What size pizza:</label>
<select id="size" name="size">
<option value=""> </option>
<option value="small">Small</option>
<option value="medium">Medium</option>
<option value="large">Large</option>
<option value="XL">Extra Large</option>
</select>
<p>
<span class="nonLabel">What topping(s):</span>
<br>
<input type="checkbox" id="pepperoni" name="toppings" value="Pepperoni">
<label for="pepperoni">Pepperoni</label>
<input type="checkbox" id="sausage" name="toppings" value="Sausage">
<label for="sausage">Sausage</label>
<input type="checkbox" id="bacon" name="toppings" value="Bacon">
<label for="bacon">Bacon</label>
<br>
<input type="checkbox" id="greenpep" name="toppings" value="Green Peppers">
<label for="greenpep">Green Peppers</label>
<input type="checkbox" id="onion" name="toppings" value="Onions">
<label for="onion">Onions</label>
<input type="checkbox" id="xcheese" name="toppings" value="Extra Cheese">
<label for="xcheese">Extra Cheese</label>
</p>
<p>
<label for="instructions" id="instrlabel">Special Instructions:</label>
</p>
<textarea id="instructions" name="instructions" rows="3" cols="60"
placeholder="Special Requests, Delivery Details"></textarea>
</fieldset>
<fieldset id="submitbutton">
<input type="submit" id="submitBtn" value="Add to Cart">
</fieldset>
</form>
</article>
</section>
<script>
document.getElementById("submitBtn ").addEventListener("submit",
validateForm(evt));
</script>
</body>
</html>
はJavaScript：
// validate required fields
function validateForm(evt){
if(evt.preventDefault){
evt.preventDefault();
}
else {
evt.returnValue = false;
}
formValidity = true;
validateFormControls();
}
function validateFormControls(){
var inputElements = document.querySelectorAll("fieldset:first-of-type
input");
var errorDiv = document.getElementById("errorMessage");
var crustBoxes = document.getElementsByName("crust");
var fieldsetValidity = true;
var elementCount = inputElements.length;
var currentElement;
try {
for(var i = 0; i < elementCount; i++){
currentElement = inputElements[i];
if(currentElement.value === ""){
currentElement.style.border = "3px solid #0B907A";
currentElement.style.backgroundColor = "#FFC58A";
fieldsetValidity = false;
}
else {
currentElement.style.border = "";
currentElement.style.backgroundColor = "";
}
}
currentElement.querySelectorAll("select")[0];
if (currentElement.selectedIndex === 0){
currentElement.style.border = "3px solid #0B907A";
currentElement.style.backgroundColor = "#FFC58A";
fieldsetValidity = false;
}
else{
currentElement.style.border = "";
currentElement.style.backgroundColor = "";
}
if (!crustBoxes[0].checked && !crustBoxes[1].checked &&
!crustBoxes[2].checked){
crustBoxes[0].style.outline = "3px solid #0B907A";
crustBoxes[1].style.outline = "3px solid #0B907A";
crustBoxes[2].style.outline = "3px solid #0B907A";
}
else {
crustBoxes[0].style.outline = "";
crustBoxes[1].style.outline = "";
crustBoxes[2].style.outline = "";
}
if (fieldsetValidity === false){
throw "Please complete all required fields.";
}
else {
errorDiv.style.display = "none";
errorDiv.innerHTM = "";
}
catch(msg){
errorDiv.style.display = "block";
errorDiv.innerHTML = msg;
formValidity = false;
}
}
}
function orderTotal(){
var itemTotal = 5;
var crusts = document.getElementsByName("crust");
var toppings = document.getElementsByName("goodnight");
var sizes = document.querySelectorAll("select")[0];
if (sizes.selectedIndex > 0) {
itemTotal += ((sizes.selectedIndex * 1) * 2);
}
for (var i=0; i < toppings.length; i++){
if (toppings[i].checked) {
itemTotal += 1;
}
}
for (var i=0; i < crusts.length; i++){
if (crusts[i].checked) {
itemTotal += (crusts[i].value * 1);
}
}
alert ("Your order total is $" + itemTotal);
document.getElementById("hidden").value = itemTotal;
}