我使用订阅脚本将用户电子邮件地址添加到mysql记录.我使用下面的代码进行此过程.工作正常.用户提交电子邮件后页面刷新,数据库也更新为MysqL :-).但问题是,当我在提交电子邮件后刷新页面时,我正在获得一个符合表格的重新提交对话框.如果我点击继续按钮,同一个电子邮件(dublicate)正在更新新记录.我的数据库正在使用相同的电子邮件地址进行更新当我刷新页面.如何禁用此消息并停止更新MysqL中的相同重复记录.
<form id="myForm" action="" onsubmit="return validateForm();"method="post">
<input type="hidden" name="action" value="update" />
<input type="text" name="email" id="email" value="Enter your email here" onfocus="if (this.value == 'Enter your email here') {this.value = '';}" onblur="if (this.value == '') {this.value = 'Enter your email here';}" onwebkitspeechchange = "this.value = this.value.replace('Enter your email here','')" style=" margin:0px 0px 0px 26px;color:#999; border:4px solid #bbb;border-radius:6px;font-size:1em;width:260px;height:30px; font-style:italic; font-family:"Times New Roman", Times, serif;"/>
<br>
<center>
<input class="button" type="image" src="RSS.png" />
</center>
</form>
<?PHP
$email = $_POST['email'];
MysqL_connect ("localhost", "root", "") or die ('Error: ' . MysqL_error());
MysqL_select_db ("test");
$query="INSERT INTO newsletter_emails (email)VALUES ('".$email."')";
MysqL_query($query) or die ('Error updating database');
?>
<script>
function validateForm() {
var x = document.forms["myForm"]["email"].value;
var atpos = x.indexOf("@");
var dotpos = x.lastIndexOf(".");
if (atpos < 1 || dotpos < atpos + 2 || dotpos + 2 >= x.length) {
alert("Not a valid e-mail address");
return false;
} else {
alert("thankyou");
}
}
</script>
解决方法: