我有一个问题。我得到了此注册表格，该表格将值存储在基于ID名称的cookie中。当您返回相同的注册表格并填写已经保存在cookie中的ID名称时，它将从cookie中获取数据并预填充表单。
我有以下代码，它在表单字段上起作用，但在无线电按钮上不起作用。不确定无线电按钮发生了什么
//This function fills in the form based on entered conference ID
function fillForm(name) {
var cookie = getCookie(name).toString();
var newCookie = decodeURIComponent(cookie);
var newArray = newCookie.split(";");
//For testing values to make sure they're there
alert(newArray);
document.getElementById("title").value = newArray[0];
document.getElementById("firstname").value = newArray[1];
document.getElementById("lastname").value = newArray[2];
document.getElementById("addressone").value = newArray[3];
document.getElementById("addresstwo").value = newArray[4];
document.getElementById("city").value = newArray[5];
document.getElementById("state").value = newArray[6];
document.getElementById("zipcode").value = newArray[7];
document.getElementById("tel").value = newArray[8];
document.getElementById("email").value = newArray[9];
document.getElementById("website").value = newArray[10];
document.getElementById("position").value = newArray[11];
document.getElementById("companyname").value = newArray[12];
if(newArray[13]) {
document.getElementById("mealone").checked = true;
}
else {
document.getElementById("mealtwo").checked = true;
}
if(newArray[15]) {
document.getElementById("sesonea").checked = true;
}
else if(newArray[16]) {
document.getElementById("sesoneb").checked = true;
}
else {
document.getElementById("sesonec").checked = true;
}
if(newArray[18]) {
document.getElementById("sestwoa").checked = true;
}
else if(newArray[19]) {
document.getElementById("sestwob").checked = true;
}
else {
document.getElementById("sestwoc").checked = true;
}
if(newArray[21]) {
document.getElementById("sesthreea").checked = true;
}
else if(newArray[22]) {
document.getElementById("sesthreeb").checked = true;
}
else {
document.getElementById("sesthreec").checked = true;
}
document.getElementById("billfirstname").value = newArray[24];
document.getElementById("billlastname").value = newArray[25];
if(newArray[26]) {
document.getElementById("carda").checked = true;
}
else if(newArray[27]) {
document.getElementById("cardb").checked = true;
}
else {
document.getElementById("cardc").checked = true;
}
document.getElementById("cardnumber").value = newArray[29];
document.getElementById("csv").value = newArray[30];
document.getElementById("cardexpmonth").value = newArray[31];
document.getElementById("cardexpyear").value = newArray[32];
}这让我发疯。我设置了一个警报，以确保我可以在数组中正确查看所有数据，但是它没有选择正确的无线电按钮。
编辑：html表格：
<!DOCTYPE html>
<html lang="en">
<head>
<script type="text/javascript" src="js/jsdefault.js"></script>
<link rel="stylesheet" href="css/webdefault.css">
<meta charset="UTF-8">
<meta name="description" content="Conference Website">
<meta name="keywords" content="Conference, website">
<meta name="author" content="Rafal Dudek">
<meta name="robots" content="all">
<title>Conference Registration</title>
</head>
<body>
<div id="header">
<nav>
<ul>
<li><a href="index.html">Index</a></li>
<li><a href="awards.html">Awards</a></li>
<li><a href="activities.html">Activities</a></li>
<li><a href="meals.html">Meals</a></li>
<li><a href="keynote.html">Keynote</a></li>
<li><a href="workshopschedule.html">Workshop Schedule</a></li>
<li><a href="registration.html">Registration</a></li>
</ul>
</nav>
</div>
<div id="main">
<form action="thankyou.html" id="registration" onsubmit="return check()" method="get">
<fieldset>
<legend>Conference ID</legend>
<label>Conference ID: <input type="text" oninput="fillForm(this.value)" id="confID" name="confID" size="6" maxlength="6" required="required" pattern="[0-9]{6}" placeholder="123456" title="Enter a 6 digit conference ID number"></label><br />
</fieldset>
<fieldset>
<legend>Personal Information</legend>
<label for="title">Title:</label>
<select id="title">
<option value="Mr.">Mr.</option>
<option value="Ms.">Ms.</option>
<option value="Mrs.">Mrs.</option>
</select><br />
<label>First Name: <input type="text" id="firstname" name="firstname" size="30" maxlength="100" required="required" pattern="[a-zA-Z]+" placeholder="First Name" title="Enter your first name"></label><br />
<label>Last Name: <input type="text" id="lastname" name="lastname" size="30" maxlength="100" required="required" pattern="[a-zA-Z-]+" placeholder="Last Name" title="Enter your last name"></label><br />
<label>Address 1: <input type="text" id="addressone" name="addressone" size="30" maxlength="100" required="required" pattern="[a-zA-Z0-9 #]+" placeholder="Address" title="Enter your address"></label><br />
<label>Address 2: <input type="text" id="addresstwo" name="addresstwo" size="30" maxlength="100" pattern="[a-zA-Z0-9 #]+" title="Optional: Enter part 2 of your address"></label><br />
<label>City: <input type="text" id="city" name="city" size="30" maxlength="100" required="required" pattern="[a-zA-Z ]+" placeholder="City" title="Enter your city"></label><br />
<label title="state">State:</label>
<select title="state" id="state">
<option value="AL">AL</option>
<option value="AK">AK</option>
<option value="AR">AR</option>
<option value="AZ">AZ</option>
<option value="CA">CA</option>
<option value="CO">CO</option>
<option value="CT">CT</option>
<option value="DC">DC</option>
<option value="DE">DE</option>
<option value="FL">FL</option>
<option value="GA">GA</option>
<option value="HI">HI</option>
<option value="IA">IA</option>
<option value="ID">ID</option>
<option value="IL">IL</option>
<option value="IN">IN</option>
<option value="KS">KS</option>
<option value="KY">KY</option>
<option value="LA">LA</option>
<option value="MA">MA</option>
<option value="MD">MD</option>
<option value="ME">ME</option>
<option value="MI">MI</option>
<option value="MN">MN</option>
<option value="MO">MO</option>
<option value="MS">MS</option>
<option value="MT">MT</option>
<option value="NC">NC</option>
<option value="NE">NE</option>
<option value="NH">NH</option>
<option value="NJ">NJ</option>
<option value="NM">NM</option>
<option value="NV">NV</option>
<option value="NY">NY</option>
<option value="ND">ND</option>
<option value="OH">OH</option>
<option value="OK">OK</option>
<option value="OR">OR</option>
<option value="PA">PA</option>
<option value="RI">RI</option>
<option value="SC">SC</option>
<option value="SD">SD</option>
<option value="TN">TN</option>
<option value="TX">TX</option>
<option value="UT">UT</option>
<option value="VT">VT</option>
<option value="VA">VA</option>
<option value="WA">WA</option>
<option value="WI">WI</option>
<option value="WV">WV</option>
<option value="WY">WY</option>
</select><br />
<label>Zip Code: <input type="text" id="zipcode" name="zipcode" size="10" maxlength="10" required="required" pattern="[0-9]{5}-[0-9]{4}" placeholder="Zip Code" title="Enter zip code"></label><br />
<label>Telephone: <input type="text" id="tel" name="tel" size="30" maxlength="100" required="required" pattern="[0-9]{3}-[0-9]{3}-[0-9]{4}" placeholder="Telephone" title="Enter telephone number"></label><br />
<label>Email: <input type="email" id="email" name="email" size="30" maxlength="100" required="required" pattern="([A-Za-z0-9_-.])+@([A-Za-z0-9_-.])+.([A-Zaz]{2,4})" placeholder="example@example.com" title="Enter email address"></label><br />
</fieldset>
<fieldset>
<legend>Company Information</legend>
<label>Company Website: <input type="url" id="website" name="website" size="30" maxlength="100" placeholder="www.example.com" title="Enter website URL"></label><br />
<label>Position: <input type="text" id="position" name="position" size="30" maxlength="100" required="required" pattern="[a-zA-Z0-9 #]+" placeholder="Position" title="Enter your position"></label><br />
<label>Company Name: <input type="text" id="companyname" name="companyname" size="30" maxlength="100" required="required" pattern="[a-zA-Z0-9 #]+" placeholder="Company Name" title="Enter company name"></label><br />
</fieldset>
<fieldset>
<legend>Dining Information</legend>
<p>
Would you like a full meal or just day 2 dinner?<br />
<label><input type="radio" id="mealone" name="meal" value="full" required/> Full Meal ($250)</label>
<label><input type="radio" id="mealtwo" name="meal" value="part"/> Day 2 dinner only ($75)</label>
</p>
</fieldset>
<fieldset>
<legend>Workshop Information</legend>
<p>
Which workshops would you like to join?<br />
Outdoors Theme:
<label><input type="radio" id="sesonea" name="session_1" value="workshop_1" required /> Lawn Maintenance</label>
<label><input type="radio" id="sesoneb" name="session_1" value="workshop_2"/> Landscaping Ideas</label>
<label><input type="radio" id="sesonec" name="session_1" value="workshop_3" /> Pest Control</label><br />
Home Improvement Theme:
<label><input type="radio" id="sestwoa" name="session_2" value="workshop_4" /> Kitchen Remodeling</label>
<label><input type="radio" id="sestwob" name="session_2" value="workshop_5"/> Bathroom Remodeling</label>
<label><input type="radio" id="sestwoc" name="session_2" value="workshop_6" /> Home Improvement Ideas</label><br />
Repair Basics Theme:
<label><input type="radio" id="sesthreea" name="session_3" value="workshop_7" required/> General Appliance Troubleshooting</label>
<label><input type="radio" id="sesthreeb" name="session_3" value="workshop_8"/> Heat and A/C Unit Maintenance</label>
<label><input type="radio" id="sesthreec" name="session_3" value="workshop_9" /> Plumbing Basics</label><br />
</p>
</fieldset>
<fieldset>
<legend>Billing Information:</legend>
<label>Billing First Name: <input type="text" id="billfirstname" name="billfirstname" size="30" maxlength="100" required="required" pattern="[a-zA-Z]+" placeholder="First Name" title="Enter first name"></label><br />
<label>Billing Last Name: <input type="text" id="billlastname" name="billlastname" size="30" maxlength="100" required="required" pattern="[a-zA-Z-]+" placeholder="Last Name" title="Enter last name"></label><br />
<p>
Card Type:<br />
<label><input type="radio" id="carda" name="card" value="visa" /> Visa</label>
<label><input type="radio" id="cardb" name="card" value="mastercard" required/> MasterCard</label>
<label><input type="radio" id="cardc" name="card" value="americanexpress"/> American Express</label>
</p>
<label>Card Number: <input type="text" id="cardnumber" name="cardnumber" size="16" maxlength="16" required="required" pattern="[0-9]{16}" placeholder="0000000000000000" title="Enter credit card number"></label><br />
<label>Card Security Value: <input type="text" id="csv" name="csv" size=4 maxlength="4" required="required" pattern="[0-9]{4}" placeholder="000" title="Enter CSV number"></label><br />
<label>Exp. Month (two digits): <input type="text" id="cardexpmonth" name="cardexpmonth" size="2" maxlength="2" required="required" pattern="(0[1-9]|1[0-2])" placeholder="MM" title="Enter two digit month"></label><br />
<label>Exp. Year (four digits): <input type="text" id="cardexpyear" name="cardexpyear" size="4" maxlength="4" required="required" pattern="[2][0]([1-2][6-9])" placeholder="YYYY" title="Enter four digit year"></label><br />
<input type="submit" value="Submit" />
</fieldset>
</form>
</div>
<div id="footer">
<address>
<small>
Contact Information:<br>
Peter John<br>
12345 Grape St.<br>
Thornton, CO 80233<br>
Telephone: 303-555-6666<br>
E-mail: <a href="mailto:peter.john@gmail.com">peter.john@gmail.com</a>
</small>
</address>
</div>
</body>
</html>添加获取并设置cookie功能，以防万一：
function setCookie(cname, cvalue, exdays) {
var d = new Date();
d.setTime(d.getTime() + (exdays*24*60*60*1000));
var expires = "expires="+ d.toUTCString();
document.cookie = cname + "=" + cvalue + ";" + expires + ";path=/";
}
//This function gets cookie value based on conference ID
function getCookie(name) {
var nameEQ = name + "=";
var ca = document.cookie.split(';');
for(var i=0;i < ca.length;i++) {
var c = ca[i];
while (c.charAt(0)==' ') c = c.substring(1,c.length);
if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
}
return null;
}cookies被存储为字符串，因此当您执行if(newArray[1])时，您要说的是if("false")或if("true")，其中Javascript中的
如果参数为空字符串（其长度为零），则结果为false；否则结果为true
来源：http：//www.ecma-international.org/publications/files/ecma-st/ecma-262.pdf
和回答来源：https：//stackoverflow.com/a/8693015/1309377
您的任何" false"都被视为true
要解决此问题，您应该做newArray[1] == "true"
//This function fills in the form based on entered conference ID
var newArray = ["true", "false", "true"] //newCookie.split(";");
if (newArray[0] == "true") {
document.getElementById("mealone").checked = true;
} else {
document.getElementById("mealtwo").checked = true;
}
if (newArray[1] == "true") {
document.getElementById("sesonea").checked = true;
} else if (newArray[2] == "true") {
document.getElementById("sesoneb").checked = true;
} else {
document.getElementById("sesonec").checked = true;
}<!DOCTYPE html>
<html lang="en">
<head>
<script type="text/javascript" src="js/jsdefault.js"></script>
<link rel="stylesheet" href="css/webdefault.css">
<meta charset="UTF-8">
<meta name="description" content="Conference Website">
<meta name="keywords" content="Conference, website">
<meta name="author" content="Rafal Dudek">
<meta name="robots" content="all">
<title>Conference Registration</title>
</head>
<body>
<div id="main">
<form action="thankyou.html" id="registration" onsubmit="return check()" method="get">
<fieldset>
<legend>Dining Information</legend>
<p>
Would you like a full meal or just day 2 dinner?<br />
<label><input type="radio" id="mealone" name="meal" value="full" required/> Full Meal ($250)</label>
<label><input type="radio" id="mealtwo" name="meal" value="part"/> Day 2 dinner only ($75)</label>
</p>
</fieldset>
<fieldset>
<legend>Workshop Information</legend>
<p>
Which workshops would you like to join?<br /> Outdoors Theme:
<label><input type="radio" id="sesonea" name="session_1" value="workshop_1" required /> Lawn Maintenance</label>
<label><input type="radio" id="sesoneb" name="session_1" value="workshop_2"/> Landscaping Ideas</label>
<label><input type="radio" id="sesonec" name="session_1" value="workshop_3" /> Pest Control</label>
</p>
</fieldset>
</body>
</html>