我试图从我的数据库中对特定数据进行排序。我已经根据第一页的用户输入来显示特定数据。但是，当我尝试对表格进行排序时，出现了一些未定义变量的错误
这是我在表格中显示数据并对表格进行排序的代码
<?php
//connect to server
$connect = mysql_connect("localhost", "root", "") or die('no database');
//connect to database
//select the database
mysql_select_db("fak_databases");
//submit button
if($_POST['formSubmit'] == "Submit")
{
$country = $_POST['country'];
}
//query the database
if($country == TRUE) {
$order = "";
$sort = "asc";
if(isset($_GET['orderby'])){
$order = $_GET['orderby'];
$sort = $_GET['sort'];
//limiting the possible values of order/sort variables
if($order != 'wipo_applicant1_city' && $order != 'applicant1_addr1')$order = "applicant1_addr1";
if($sort != 'asc' && $sort != 'desc')$sort = "asc";
$sql = "SELECT wipo_applicant1_city, applicant1_addr1 FROM auip_wipo_sample WHERE applicant1_country='$country' ORDER BY ".mysql_real_escape_string($order)." ".$sort;
//here we reverse the sort variable
if($sort == "asc"){
$sort = "desc";
}
else{
$sort = "asc";
}
}
}
$sql = "SELECT wipo_applicant1_city, applicant1_addr1 FROM auip_wipo_sample WHERE applicant1_country='$country'";
$result = mysql_query($sql) or die('failed to run');
$num_rows = mysql_num_rows($result);
$row_counter = 0;
$icon = "";
echo "<table border=\"1\" cellspacing=\"0\">\n";
echo "<tr>\n";
// first column
echo "<th>";
$icon = "";
if($order == "wipo_applicant1_city"){
if($sort == "asc"){
$icon = "<img src=\"images/up.png\" class=\"arrowSpace\"/>";
}
if($sort == "desc"){
$icon = "<img src=\"images/down.png\" class=\"arrowSpace\"/>";
}
}
//print the result
echo "<a href='showDB1.php?orderby=wipo_applicant1_city&sort=".$sort."'>City</a>".$icon;
echo "</th>\n";
// second column
echo "<th>";
$icon = "";
if($order == "applicant1_addr1"){
if($sort == "asc"){
$icon = "<img src=\"images/up.png\" class=\"arrowSpace\"/>";
}
if($sort == "desc"){
$icon = "<img src=\"images/down.png\" class=\"arrowSpace\"/>";
}
}
echo "<a href='showDB1.php?orderby=applicant1_addr1&sort=".$sort."'>Address</a>".$icon;
echo "</th>\n";
echo "</tr>";
//fetch the result
while($row = mysql_fetch_array($result))
{
if($row_counter % 2){
$row_color="bgcolor='#FFFFFF'";
}else{
$row_color="bgcolor='#F3F6F8'";
}
echo "<tr class=\"TrColor\" ".$row_color.">";
echo "<td>" . $row['wipo_applicant1_city'] . "</td>\n";
echo "<td>" . $row['applicant1_addr1'] . "</td>\n";
echo "</tr>";
$row_counter++;
}
Print "</table>";
?>
我有错误
Undefined index: formSubmit in C:\xampp\htdocs\fak_ict1999\sorting\showDB1.php
Undefined variable: country in C:\xampp\htdocs\fak_ict1999\sorting\showDB1.php
Undefined variable: country in C:\xampp\htdocs\fak_ict1999\sorting\showDB1.php
Undefined variable: order in C:\xampp\htdocs\fak_ict1999\sorting\showDB1.php
Undefined variable: sort in C:\xampp\htdocs\fak_ict1999\sorting\showDB1.php
当我分析我的代码时，我认为我在
if($_POST['formSubmit'] == "Submit")
{
$country = $_POST['country'];
}
//query the database
if($country == TRUE) {
$order = "";
$sort = "asc";
if(isset($_GET['orderby'])){
$order = $_GET['orderby'];
$sort = $_GET['sort'];
//limiting the possible values of order/sort variables
if($order != 'wipo_applicant1_city' && $order != 'applicant1_addr1')$order = "applicant1_addr1";
if($sort != 'asc' && $sort != 'desc')$sort = "asc";
$sql = "SELECT wipo_applicant1_city, applicant1_addr1 FROM auip_wipo_sample WHERE applicant1_country='$country' ORDER BY ".mysql_real_escape_string($order)." ".$sort;
//here we reverse the sort variable
if($sort == "asc"){
$sort = "desc";
}
else{
$sort = "asc";
}
}
}
$sql = "SELECT wipo_applicant1_city, applicant1_addr1 FROM auip_wipo_sample WHERE applicant1_country='$country'";
因为当我尝试对表格进行排序时，排序功能正在尝试再次访问表单提交，这是表单提交仅在用户选择他们的选项时在第一页上访问。
有谁知道如何解决这个问题？
我的html代码
<!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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Data Mining</title>
</head>
<body>
<form action="showDB.php" method="post">
<table border="0">
<tr>
<th colspan="3">test</th>
</tr>
<tr>
<td>Select Foreign Agent Country</td>
<td></td>
<td>
<select name="country">
<option value="US">United States</option>
<option value="NZ">New Zealand</option>
<option value="JP">Japan</option>
</select>
</td>
</tr>
<td colspan="3">
<input type="submit" name="formSubmit" value="Submit">
</td>
</table>
</form>
</body>
</html>
这是我的 javascript 代码
function SelectAll(btn) {
var blnVal = false;
if (btn.value == "Select All") {
btn.value = "Unselect All";
blnVal = true;
}else {
btn.value = "Select All";
blnVal = false;
}
var d = document.forms["auip_wipo_sample"];
if(d["auip_wipo_sample[]"] == null)
{}
else if (d["auip_wipo_sample[]"].length == null) {
d["auip_wipo_sample[]"].checked = blnVal;
}
else {
for (var i = 0; i < d["auip_wipo_sample[]"].length; i++) {
d["auip_wipo_sample[]"][i].checked = blnVal;
}
}
}