我正在尝试编写一个复选框，必须选中该复选框才能启用表单上的“提交”按钮。我首先尝试使用链接文件无济于事；现在即使插入脚本似乎也不起作用。谁能帮忙？该页面的完整代码发布在下面。提前致谢!
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<link rel="stylesheet" type="text/css" href="stylesheet.css" />
<script type="text/javascript" src="includes/imagetransition.js"></script>
<script type="text/javascript" src="includes/checkenabledisable.js"></script>
<script type="text/javascript">
var checker = document.getElementById('acknowledgment');
var sendbtn = document.getElementById('submitmessage');
// when unchecked or checked, run the function
checker.onchange = function(){
if(this.checked){
sendbtn.disabled = false;
} else {
sendbtn.disabled = true;
}
}
</script>
<title>Contact Us</title>
</head>
<body>
<div class="page-wrapper">
<div id="header">
<img src="images/img1.jpg" name="slideshow" width="70%" height="200" alt="headerimage.gif"><br>
<a href="javascript:chgImg(-1)">Previous</a> |
<a href="javascript:auto()">Auto/Stop</a> |
<a href="javascript:chgImg(1)">Next</a></div>
<br><br>
<aside class="sidebar">
<div id="vmenu">
<ul>
<li class="sideli"><a href="main.html.php">Home</a></li>
<li class="sideli"><a href="areas.html.php">Areas</a></li>
<li class="sideli"><a href="profiles.html.php">Profiles</a></li>
<li class="sideli"><a href="contactus.html.php">Contact Us</a></li>
</ul>
</div>
</aside>
<section class="main">
We will review your submission and contact you, usually within 72 hours.</p>
<form action="actionemail.php" method="post">
<table class="emailtable">
<tr><td><label for="name" class="emaillabel">Name: </label></td><td><input type="text" name="fullname" size="50" value="Name" style="width: 290px;" /></td></tr>
<tr><td><label for="phone" class="emaillabel">Phone: </label></td><td><input type="text" name="phone" size="20" value="Phone" style="width: 290px;" /></td></tr>
<tr><td><label for="email" class="emaillabel">Email: </label></td><td><input type="text" name="email" size="50" value="Email" style="width: 290px;" /></td></tr>
<tr><td><label for="comment" class="emaillabel">Issue: </label></td><td><textarea rows="3" cols="26" name="comment" value="Tell Us More" style="width: 290px; height: 55px"></textarea></td></tr>
</table><br>
<input id="acknowledgment" type="checkbox" name="acknowledgment" value="1" /><label for="acknowledgment">I acknowledge that there may be a delay in responding to this request.</label><br>
<br><input id="submitmessage" type="submit" name ="submitmessage" value="Send Email" disabled />
</form>
</section>
</div>
</body>
</html>
最佳答案
您的功能不是“监听”onchange 事件。
改用这个。请注意，我将复选框更改为具有 onclick 事件。
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<link rel="stylesheet" type="text/css" href="stylesheet.css" />
<script type="text/javascript" src="includes/imagetransition.js"></script>
<script type="text/javascript" src="includes/checkenabledisable.js"></script>
<script type="text/javascript">
function enableSubmitButton() {
if (document.getElementById("acknowledgment").checked == true)
document.getElementById("submitmessage").disabled = false;
}
</script>
<title>Contact Us</title>
</head>
<body>
<div class="page-wrapper">
<div id="header">
<img src="images/img1.jpg" name="slideshow" width="70%" height="200" alt="headerimage.gif"><br>
<a href="javascript:chgImg(-1)">Previous</a> |
<a href="javascript:auto()">Auto/Stop</a> |
<a href="javascript:chgImg(1)">Next</a></div>
<br><br>
<aside class="sidebar">
<div id="vmenu">
<ul>
<li class="sideli"><a href="main.html.php">Home</a></li>
<li class="sideli"><a href="areas.html.php">Areas</a></li>
<li class="sideli"><a href="profiles.html.php">Profiles</a></li>
<li class="sideli"><a href="contactus.html.php">Contact Us</a></li>
</ul>
</div>
</aside>
<section class="main">
We will review your submission and contact you, usually within 72 hours.</p>
<form action="actionemail.php" method="post">
<table class="emailtable">
<tr><td><label for="name" class="emaillabel">Name: </label></td><td><input type="text" name="fullname" size="50" value="Name" style="width: 290px;" /></td></tr>
<tr><td><label for="phone" class="emaillabel">Phone: </label></td><td><input type="text" name="phone" size="20" value="Phone" style="width: 290px;" /></td></tr>
<tr><td><label for="email" class="emaillabel">Email: </label></td><td><input type="text" name="email" size="50" value="Email" style="width: 290px;" /></td></tr>
<tr><td><label for="comment" class="emaillabel">Issue: </label></td><td><textarea rows="3" cols="26" name="comment" value="Tell Us More" style="width: 290px; height: 55px"></textarea></td></tr>
</table><br>
<input id="acknowledgment" type="checkbox" name="acknowledgment" value="1" onclick="enableSubmitButton()"><label for="acknowledgment">I acknowledge that there may be a delay in responding to this request.</label><br>
<br><input id="submitmessage" type="submit" name ="submitmessage" value="Send Email" disabled />
</form>
</section>
</div>
</body>
</html>
关于Javascript 无法在 PHP 页面上运行，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/19216956/