How to post value from one php page to another using ajax - php

Question

I am trying to post one value which I got using Jquery, so I have to pass that value to php page using ajax. but when I did this I got Undefined index data error.
Here is my code:
$("#requirementtable tbody tr").on("click", function(){
desc = $(this).closest("tr").find("td:nth-child(4)").text().trim();
$.ajax({
type:"POST",
url:"get_diagnosis.php",
data: desc,
success: function (data, textStatus, jqXHR)
{
alert(data);
},
error: function (jqXHR, textStatus, errorThrown)
{
alert("some error occured->" + jqXHR.responseJSON);
}
})
})
this is my php code:
<?php
$data = $_POST['data'];
echo $data;
?>

Answer 1

Check the desc variable has some value in it and you have to post data like,
data: {data:desc},
AJAX Code,
$.ajax({
type:"POST",
url:"get_diagnosis.php",
data: {data:desc},
success: function (data, textStatus, jqXHR) {
alert(data);
},
error: function (jqXHR, textStatus, errorThrown) {
alert("some error occured->" + jqXHR.responseJSON);
}
});
And in PHP use isset() to prevent undefined errors like,
<?php
$data = isset($_POST['data']) ? $_POST['data'] : 'Not defined';
echo $data;
?>
If you want JSON response format then use dataType:'json' in $.ajax, and use json_encode() in PHP to respond it.

Answer 2

here is a simple example that contains your code and solution
//Data Object
var obj={
name:"uneeb",
city:"gujranwala",
state: "punjab"
};
//Data Object
//Ajax Request to Server
$.ajax({
type: 'post',
url: 'someFile.php',
data:object,
success: function (data) {
//do something here
}
});
//Ajax Request to Server
//PHP
echo $_POST['name']; //prints uneeb
echo $_POST['city']; //prints gujranwala
echo $_POST['state']; //prints punjab
//PHP

Answer 3

Replace the followings:
desc = $(this).closest("tr").find("td:nth-child(4)").text().trim();
// remove ^^^^^^^^^^ since you're currently in tr click
desc = $(this).find("td:nth-child(4)").text().trim();
And replace to:
data: desc,
With:
data: {data:desc}, //to pass data as object as you don't have serialized data
And inside your php code, you can get data using $_POST['data'].

Answer 4

replace this data: desc, field in your ajax to data:{data: desc},, this is the cause you are not getting data in your php code