update php page using ajax using post requests reload the page?
Question
I am trying to change the content of my php web page using ajax as below the index.php page has input filed that call a function to executed on the button click but my problem is that the page is reload it
so i want to know what I am doing wrong??
Note that i am using the post requests to keep my data secure as w3schools.com recommended
inexd.php file code below
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Site Title</title>
</head>
<body align="left">
<div>
<h4 align="left">Balance Enquiry</h4>
</div>
<form>
<div>
<label>Account Number </label>
<input id="AccNum" type="text" name="AccNumInput">
<button type="button" onclick="SendForm()">Search</button>
</div>
</form>
<script>
function SendForm()
{
alert("Hello! SendForm start");
var xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange = function()
{
if (xmlhttp.readyState == 4 && xmlhttp.status == 200)
{
document.getElementById("AccNum").innerHTML = xmlhttp.responseText;
}
};
alert("Hello! going to send ajax");
var x = xmlhttp.open("POST","AccData.php", true);
xmlhttp.send(document.getElementById("AccNum").value); // you want to pass the Value so u need the .value at the end!!!
alert(document.getElementById("AccNum").value);
alert("Hello! SendForm end");
}
</script>
</body>
</html>
The data.php file code below
<?php
alert("Hello! php start processing");
$AccountNumber = $_POST['AccNum'];
$conn = oci_connect('admin', 'admin', 'localhost/JDT', 'AL32UTF8');
if (!$conn) {
$e = oci_error();
trigger_error(htmlentities($e['message'], ENT_QUOTES), E_USER_ERROR);
}
alert("Hello! connected to oracle");
$sqlstr = 'SELECT CUSTOMER_ID,CUST_NAME,PHONE1 FROM customers where CUSTOMER_ID=:AccNum';
$stid = oci_parse($conn, $sqlstr); // creates the statement
oci_bind_by_name($stid, ':AccNum', $AccountNumber); // binds the parameter
oci_execute($stid); // executes the query
echo $AccountNumber;
/**
* THIS WHILE LOOP CREATES ALL OF YOUR HTML (its no good solution to echo data out like this)
*/
while ($row = oci_fetch_array($stid, OCI_ASSOC + OCI_RETURN_NULLS)) {
echo "<tr>";
foreach ($row as $item) {
echo "<td align=center>" . ($item !== null ? htmlentities($item, ENT_QUOTES) : " ") . "</td>";
}
echo "</tr>\n";
}
echo "</table>\n";
oci_free_statement($stid); // releases the statement
oci_close($conn); // closes the conneciton
?>
1 answers
solution1
1 2016-08-13 13:31:10
With the <input type="submit" value="Search"> your sending the form the "old" way to the server not with Ajax!
<form>
<div>
<label>Account Number </label>
<input id="AccNum" type="text" name="AccNuminput">
<button type="button" onclick="sendForm()">Search</button>
</div>
</form>
<script>
function sendForm(){
var xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange = function() {
if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
//Execudted when finished and everything its Okay
document.getElementById("AccNum").innerHTML = xmlhttp.responseText;
}
};
xmlhttp.open("POST", "acc_data.php", true);
xmlhttp.send("accNum="+document.getElementById("AccNum").value); // you want to pass the Value so u need the .value at the end!!!
}
</script>
Then in your data.php you do not need any html you just need to process the the data that you received by the ajax post request(Session is also not needed for that) . In the xmlhttp.responseText you are receiving your answer from the server when the request is finished.
<?php
$accountNumber = $_POST['accNum'];// set a good variable name
$conn = oci_connect('admin', 'admin', 'localhost/JDT', 'AL32UTF8'); //setup connection
if (!$conn) {
$e = oci_error();
trigger_error(htmlentities($e['message'], ENT_QUOTES), E_USER_ERROR); // throws an error on connection error
}
$sqlstr = 'SELECT CUSTOMER_ID,CUST_NAME,PHONE1 FROM customers where CUSTOMER_ID=:ACCNUM'; // sql stirng
$stid = oci_parse($conn, $sqlstr); // creates the statement
oci_bind_by_name($stid, ':ACCNUM', $accountNumber); // binds the parameter
oci_execute($stid); // executes the query
/**
* THIS WHILE LOOP CREATES ALL OF YOUR HTML (its no good solution to echo data out like this)
*/
while ($row = oci_fetch_array($stid, OCI_ASSOC + OCI_RETURN_NULLS)) {
echo "<tr>";
foreach ($row as $item) {
echo "<td align=center>" . ($item !== null ? htmlentities($item, ENT_QUOTES) : " ") . "</td>";
}
echo "</tr>\n";
}
echo "</table>\n";
oci_free_statement($stid); // releases the statement
oci_close($conn); // closes the conneciton
?>
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