我要设置Javascript以验证所需的表单字段。如果缺少表单字段，则会在用户屏幕上显示弹出窗口。我已经能够解决大部分问题，但问题出在复选框上。如果用户未单击复选框，则会收到错误消息。我编写代码的方式，如果用户检查“星期一”表单被处理，但如果他们检查除星期一以外的任何其他日子，那么他们仍会收到错误消息，有什么想法吗？
function checked() {
var userName = document.getElementById("text").value;
var userPhone = document.getElementById("phone").value;
var checkBoxCheck = document.getElementById("checkers").checked;
var otherOne = document.getElementById("dropdown").value;
var addInfo = document.getElementById("textarea").value;
if (userName == "" || userPhone == "" || checkBoxCheck == "") {
alert("Please fill in: name, phone number, days of week.");
if (otherOne == "Other") {
if (addInfo == "") {
alert("Please fill in your additional information.");
}
}
return false;
} else {
return true;
}
}<body>
<div class="container-fluid">
<div class="page-header">
<table border="1" width="100%" Frame="below">
<thead>
<h1 style="color:purple" align="center"><span>C</span>aFe 80's</h1>
</thead>
</table>
</div>
<table border="0" width="20%" cellspacing="20">
<ul class="list-inline nav nav-tabs">
<li><a href="Lab-9CSSHomePageV6.html"><span class="glyphicon glyphicon-home"></span></a>
</li>
<li><a href="Lab-9CSSMenuPageV6.html">Menu</a>
</li>
<li class="active"><a href="Lab-9CSSContactPageV6.html">Contact Us</a>
</li>
</ul>
</table>
</div>
<div class="container" style="height: 700px; position: relative; top: 60px">
<form onsubmit="return checked()" action="lab-9CSSContactPageV6.html" method="POST">
<div class="form-group">
<label for="text">Name:</label>
<input type="text" class="form-control" id="text">
</div>
<div class="form-group">
<label for="email">Email address:</label>
<input type="email" class="form-control" id="email">
</div>
<div class="form-group">
<label for="phone">Phone Number:</label>
<input type="phone" class="form-control" id="phone">
</div>
<div class="form-group">
<label for="dropdown">Reason for Inquiry:</label>
<select class="form-control" id="dropdown">
<option>Catering</option>
<option>Private Party</option>
<option>Feedback</option>
<option id="oOther">Other</option>
</select>
</div>
<div class="form-group">
<label for="textarea">Addition Imformation:</label>
<textarea class="form-control" rows="5" id="textarea"></textarea>
</div>
<div class="form-group" style="position:relative; right: 40px">
<div class="radio-inline">
<label class="radio-inline">Have you been to the restaurant?</label>
<label class="radio-inline">
<input type="radio" name="rad" checked>No</label>
<label class="radio-inline">
<input type="radio" name="rad">Yes</label>
</div>
</div>
<div class="form-group" style="position:relative; right: 40px">
<div class="checkbox-inline">
<label class="checkbox-inline">Best days to contact you:</label>
<label class="checkbox-inline">
<input id="checkers" type="checkbox" value="">M</label>
<label class="checkbox-inline">
<input id="checkers" type="checkbox" value="">T</label>
<label class="checkbox-inline">
<input id="checkers" type="checkbox" value="">W</label>
<label class="checkbox-inline">
<input id="checkers" type="checkbox" value="">TH</label>
<label class="checkbox-inline">
<input id="checkers" type="checkbox" value="">F</label>
</div>
</div>
<div class="form-group" align="center">
<button type="submit" class="btn btn-default">Send Request</button>
</div>
</form>
</div>
答案 0 :(得分：1)
多个元素不应该具有相同的id。对于您的复选框，您将要使用name属性。请注意，您还应该为value属性提供字符串，否则在提交表单时不会提交任何内容。
<input id="checkers_m" name="checkers" type="checkbox" value="M">M</input>
然后在验证函数中使用以下方法获取所有复选框元素：
var checkboxes = document.getElementsByName('checkers');
确保检查其中一个。
答案 1 :(得分：0)
首先，正如@Riaz所指出的，你有多个具有相同ID的元素，这是错误的。将其更改为name。
其次，你在复选框上缺少价值。为它们分配正确的值。
第三，(userName == "" || userPhone == "" || checkBoxCheck == "")这种情况对于任何一种情况都会返回。尝试拆分为不同的if。
以下是验证复选框值的演示：
function checked() {
var userName = document.getElementById("text").value;
var userPhone = document.getElementById("phone").value;
var checkBoxCheck = document.getElementsByName("checkers");
var otherOne = document.getElementById("dropdown").value;
var addInfo = document.getElementById("textarea").value;
var checkValid = false;
for(var i =0; i<checkBoxCheck.length; i++){
if(checkBoxCheck[i].checked){
checkValid = true;
break;
}
}
if(!checkValid){
alert("Please check a checkbox")
}
if (userName == "" || userPhone == "") {
alert("Please fill in: name, phone number, days of week.");
if (otherOne == "Other") {
if (addInfo == "") {
alert("Please fill in your additional information.");
}
}
return false;
} else {
return true;
}
}<body>
<div class="container-fluid">
<div class="page-header">
<table border="1" width="100%" Frame="below">
<thead>
<h1 style="color:purple" align="center"><span>C</span>aFe 80's</h1>
</thead>
</table>
</div>
<table border="0" width="20%" cellspacing="20">
<ul class="list-inline nav nav-tabs">
<li><a href="Lab-9CSSHomePageV6.html"><span class="glyphicon glyphicon-home"></span></a>
</li>
<li><a href="Lab-9CSSMenuPageV6.html">Menu</a>
</li>
<li class="active"><a href="Lab-9CSSContactPageV6.html">Contact Us</a>
</li>
</ul>
</table>
</div>
<div class="container" style="height: 700px; position: relative; top: 60px">
<form onsubmit="return checked()" action="lab-9CSSContactPageV6.html" method="POST">
<div class="form-group">
<label for="text">Name:</label>
<input type="text" class="form-control" id="text">
</div>
<div class="form-group">
<label for="email">Email address:</label>
<input type="email" class="form-control" id="email">
</div>
<div class="form-group">
<label for="phone">Phone Number:</label>
<input type="phone" class="form-control" id="phone">
</div>
<div class="form-group">
<label for="dropdown">Reason for Inquiry:</label>
<select class="form-control" id="dropdown">
<option>Catering</option>
<option>Private Party</option>
<option>Feedback</option>
<option id="oOther">Other</option>
</select>
</div>
<div class="form-group">
<label for="textarea">Addition Imformation:</label>
<textarea class="form-control" rows="5" id="textarea"></textarea>
</div>
<div class="form-group" style="position:relative; right: 40px">
<div class="radio-inline">
<label class="radio-inline">Have you been to the restaurant?</label>
<label class="radio-inline">
<input type="radio" name="rad" checked>No</label>
<label class="radio-inline">
<input type="radio" name="rad">Yes</label>
</div>
</div>
<div class="form-group" style="position:relative; right: 40px">
<div class="checkbox-inline">
<label class="checkbox-inline">Best days to contact you:</label>
<label class="checkbox-inline">
<input name="checkers" type="checkbox" value="1">M</label>
<label class="checkbox-inline">
<input name="checkers" type="checkbox" value="2">T</label>
<label class="checkbox-inline">
<input name="checkers" type="checkbox" value=3"">W</label>
<label class="checkbox-inline">
<input name="checkers" type="checkbox" value="4">TH</label>
<label class="checkbox-inline">
<input name="checkers" type="checkbox" value="5">F</label>
</div>
</div>
<div class="form-group" align="center">
<button type="button" onclick="checked()" class="btn btn-default">Send Request</button>
</div>
</form>
</div>