我想知道在表单提交后是否可以在表单字段内保留用户输入，以便用户可以更新条目。我有一个html注册表单[有一些JS验证]，然后是一个php文件，用于将数据插入到sql＆amp;同时在表格视图中显示插入的数据。我还在php文件中包含表单的html代码，以便我可以在提交后看到该表单。但是在表单提交后我无法将数据保留在字段中！这是表格：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<script type="text/javascript">
<!--
function validateNum(evt) {
var theEvent = evt;
var key = theEvent.keyCode || theEvent.which;
key = String.fromCharCode( key );
var regex = /[0-9]/;
if( !regex.test(key) ) {
theEvent.returnValue = false;
if(theEvent.preventDefault) theEvent.preventDefault();
}
}
function validate(evt){
if( document.myForm.ic.value == ""){
alert( "IC Number cann't be empty!" );
document.myForm.ic.focus() ;
return false;}
else if(isNaN( document.myForm.ic.value ) || document.myForm.ic.value.length != 12){
evt.preventDefault();
alert( "Please provide your correct IC Number!" );
document.myForm.ic.focus() ;
return false;}
if( document.myForm.name.value == "") {
alert( "Name cann't be empty!" );
document.myForm.name.focus() ;
return false;
}
if( document.myForm.contact.value == ""){
alert( "Contact number cann't be empty!");
document.myForm.contact.focus() ;
return false;
} else if(isNaN( document.myForm.contact.value ))
{
evt.preventDefault();
alert( "Please provide your correct Contact Number!" );
document.myForm.contact.focus() ;
return false;
}
if( document.myForm.address.value == "" ){
alert( "Please provide your Address!" );
document.myForm.address.focus() ;
return false;
}
}
//-->
</script>
</head>
<style type="text/css">
h2 {
color: #06C;
}
body {
background-color: #FFC;
}
</style>
<body>
<form name="myForm" method="post" action="insert.php" onsubmit="return(validate(event));">
<div align="center"><br>
<table width="453" border="0">
<tr>
<th colspan="4" bgcolor="#99FFFF" scope="col">
<h3>Workshop Name: PHP! </h3></th>
</tr>
<tr bgcolor="#99FF99">
<td width="142"> IC Number</td>
<td width="15"><div align="center">:</div></td>
<td colspan="2"><div align="right">
<input
name="ic" type="text" id="ic" maxlength="12" size="45" onkeypress='validateNum(event)'/>
</div></td>
</tr>
<tr bgcolor="#99FFFF">
<td>Full Name</td>
<td><div align="center">:</div></td>
<td colspan="2"><div align="right">
<input
name="name" type="text" id="name" size="45"/>
</div></td>
</tr>
<tr bgcolor="#99FF99">
<td>Contact No.</td>
<td><div align="center">:</div></td>
<td colspan="2"><div align="right">
<input
name="contact" type="text" id="contact" size="45" onkeypress='validateNum(event)' />
</div></td>
</tr>
<tr bgcolor="#99FFFF">
<td>Email</td>
<td><div align="center">:</div></td>
<td colspan="2"><div align="right">
<input
name="mail" type="text" id="mail" size="45"/>
</div></td>
</tr>
<tr bgcolor="#99FF99">
<td height="60">Address</td>
<td><div align="center">:</div></td>
<td colspan="2">
<div align="right">
<textarea name="address" id="address" cols="35" rows="3"></textarea>
</div>
</td>
</tr>
<tr bgcolor="#99FFFF">
<td colspan="2"> </td>
<td width="231"><input type="reset" value="Clear" /></td>
<td width="47"><div align="right">
<input type="submit" value="Submit" />
</div></td>
</tr>
</table>
<br>
</div>
</form>
</body>
</html>
这是insert.php文件：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<script type="text/javascript">
<!--
function validateNum(evt) {
var theEvent = evt;
var key = theEvent.keyCode || theEvent.which;
key = String.fromCharCode( key );
var regex = /[0-9]/;
if( !regex.test(key) ) {
theEvent.returnValue = false;
if(theEvent.preventDefault) theEvent.preventDefault();
}
}
function validate(evt){
if( document.myForm.ic.value == ""){
alert( "IC Number cann't be empty!" );
document.myForm.ic.focus() ;
return false;}
else if(isNaN( document.myForm.ic.value ) || document.myForm.ic.value.length != 12){
evt.preventDefault();
alert( "Please provide your correct IC Number!" );
document.myForm.ic.focus() ;
return false;}
if( document.myForm.name.value == "") {
alert( "Name cann't be empty!" );
document.myForm.name.focus() ;
return false;
}
if( document.myForm.contact.value == ""){
alert( "Contact number cann't be empty!");
document.myForm.contact.focus() ;
return false;
} else if(isNaN( document.myForm.contact.value ))
{
evt.preventDefault();
alert( "Please provide your correct Contact Number!" );
document.myForm.contact.focus() ;
return false;
}
if( document.myForm.address.value == "" ){
alert( "Please provide your Address!" );
document.myForm.address.focus() ;
return false;
}
}
//-->
</script>
</head>
<style type="text/css">
h2 {
color: #06C;
}
body {
background-color: #FFC;
}
</style>
<body>
<form name="myForm" method="post" action="update.php" onsubmit="return(validate(event));">
<div align="center"><br>
<table width="453" border="0">
<tr>
<th colspan="4" bgcolor="#99FFFF" scope="col">
<h3>Workshop Name: PHP! </h3></th>
</tr>
<tr bgcolor="#99FF99">
<td width="142"> IC Number</td>
<td width="15"><div align="center">:</div></td>
<td colspan="2"><div align="right">
<input
name="ic" type="text" id="ic" maxlength="12" size="45" onkeypress='validateNum(event)'/>
</div></td>
</tr>
<tr bgcolor="#99FFFF">
<td>Full Name</td>
<td><div align="center">:</div></td>
<td colspan="2"><div align="right">
<input
name="name" type="text" id="name" size="45"/>
</div></td>
</tr>
<tr bgcolor="#99FF99">
<td>Contact No.</td>
<td><div align="center">:</div></td>
<td colspan="2"><div align="right">
<input
name="contact" type="text" id="contact" size="45" onkeypress='validateNum(event)' />
</div></td>
</tr>
<tr bgcolor="#99FFFF">
<td>Email</td>
<td><div align="center">:</div></td>
<td colspan="2"><div align="right">
<input
name="mail" type="text" id="mail" size="45"/>
</div></td>
</tr>
<tr bgcolor="#99FF99">
<td height="60">Address</td>
<td><div align="center">:</div></td>
<td colspan="2">
<div align="right">
<textarea name="address" id="address" cols="35" rows="3"></textarea>
</div>
</td>
</tr>
<tr bgcolor="#99FFFF">
<td colspan="2"> </td>
<td width="231"><input type="reset" value="Clear" /></td>
<td width="47"><div align="right">
<input type="submit" value="Update" />
</div></td>
</tr>
</table>
<br>
</div>
</form>
<br>
</div>
</form>
<div align="center">
<?php
if (!mysql_connect('localhost', 'root', '')) {
echo "Connected";
}
mysql_select_db("workshop");
// Get values from form
$ic = mysql_real_escape_string($_POST['ic']);
$name = mysql_real_escape_string($_POST['name']);
$contact = mysql_real_escape_string($_POST['contact']);
$mail = mysql_real_escape_string($_POST['mail']);
$address = mysql_real_escape_string($_POST['address']);
if (staff_detail_exist($ic) == "available") {
insert_staff_detail($ic, $name, $contact, $mail, $address, $paytype);
echo "<p style='text-align:center; color:green;'>" . "Workshop application successful! You will be notified shortly via E-mail after confirmation! Thank You!";
} else if (staff_detail_exist($ic) == "exist") {
echo "<p style='text-align:center; color:red;'>" . "Record already exists! Please enter another Staff ID. Thank You!" . "</p>";
}
function insert_staff_detail($ic, $name, $contact, $mail, $address, $paytype) {
$sql = "INSERT INTO apply (staffid, staffname, staffno, staffemail, staffaddress, paytype) VALUES ('$ic', '$name', '$contact', '$mail', '$address','$paytype')";
mysql_query($sql);
}
function staff_detail_exist($ic) {
$result = null;
$sql = "SELECT * FROM apply WHERE staffid = '$ic'";
$data = mysql_query($sql);
if (mysql_num_rows($data) == 0) {
$result = "available";
} else {
$result = "exist";
}
return $result;
}
$staffid = $_POST['ic'];
$con = mysql_connect("localhost", "root", "");
if (!$con) {
die('Could not connect: ' . mysql_error());
}
mysql_select_db("workshop", $con);
$result = mysql_query("SELECT * FROM apply where staffid = '$ic'");
echo "<table width=400 border=1 cellpadding=0 align=center>";
while ($row = mysql_fetch_array($result)) {
echo "<tr>";
echo "<th>Staff/IC Number: </th><td>" . "<center>" . $row['staffid'] . "</center>" . "</td>";
echo "</tr>";
echo "<th>Name: </th><td>" . "<center>" . $row['staffname'] . "</center>" . "</td>";
echo "</tr>";
echo "<th>Email: </th><td>" . "<center>" . $row['staffemail'] . "</center>" . "</td>";
echo "</tr>";
echo "<th>Contact No.: </th><td>" . "<center>" . $row['staffno'] . "</center>" . "</td>";
echo "</tr>";
echo "<th>Address: </th><td>" . "<center>" . $row['staffaddress'] . "</center>" . "</td>";
echo "</tr>";
}
echo "</table>";
mysql_close($con);
?>
</body>
</html>
我试图在php文件的表单字段中添加value="<? echo "$row['staffid']"?>"，但没有运气！我只是基本的PHP。那么，有什么帮助吗？谢谢！
答案 0 :(得分：1)
Take the form posted values just above your html code like this
<?php
if (isset($_POST["submit"]) && $_POST["submit"]=='Submit') {
$name=$_POST["name"];
}
?>
And echo it in your html form.
<input name="name" type="text" id="name" size="45" value="<? echo $name?>"/>
答案 1 :(得分：1)
我已经使用过几次这个功能;非常方便
function getPost($field){
return (isset($_POST[$field]) && $_POST[$field] != "" ? $_POST[$field] : "");
}
用法
<input type="text" name="contact" value="<?php echo getPost("contact"); ?>" />
这是针对用户提交信息并且由于某种原因再次发送回表单的情况 - 例如，他们的条目可能没有通过PHP验证。
答案 2 :(得分：1)
感谢所有，它终于工作了:)我在输入标签中使用了value="<?php echo isset($_POST['myField']) ? $_POST['myField'] : 'myField_db' ?>"。所以，它是：<input type="text" name="myField" value="<?php echo isset($_POST['myField']) ? $_POST['myField'] : 'myField_db' ?>" />其中myField是输入名称＆amp; myField_db是数据库中的列名。