How to use Ajax in PHP with JQuery

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Function: _error_handler

File: /home/hrdv7o2ounf4/public_html/institute-websites/webdevelopmentinstitute.com/application/controllers/Welcome.php
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Function: view

File: /home/hrdv7o2ounf4/public_html/institute-websites/webdevelopmentinstitute.com/index.php
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File: /home/hrdv7o2ounf4/public_html/institute-websites/webdevelopmentinstitute.com/application/views/courses-details.php
Line: 116
Function: _error_handler

File: /home/hrdv7o2ounf4/public_html/institute-websites/webdevelopmentinstitute.com/application/controllers/Welcome.php
Line: 653
Function: view

File: /home/hrdv7o2ounf4/public_html/institute-websites/webdevelopmentinstitute.com/index.php
Line: 315
Function: require_once

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Backtrace:

File: /home/hrdv7o2ounf4/public_html/institute-websites/webdevelopmentinstitute.com/application/views/courses-details.php
Line: 116
Function: _error_handler

File: /home/hrdv7o2ounf4/public_html/institute-websites/webdevelopmentinstitute.com/application/controllers/Welcome.php
Line: 653
Function: view

File: /home/hrdv7o2ounf4/public_html/institute-websites/webdevelopmentinstitute.com/index.php
Line: 315
Function: require_once

Course Description :
Ajax is called (Asynchronous JavaScript and XML) , It is used when we want to send data into database or recieve data from database without reloading the whole page.

Example : 

1.  
Promocode in ecommerce website , when user applied promocode in ecommerce website , after successfully applied webpage not reloading just showing coupon applied message to us.
                  
2.  When we want to recieve complete data of employee or patient on behalf of employee id or patient id without page refreshing 
 
There are number of examples in ajax just keep one point in your mind is that when we want data or send data without page reload.

Solution :   

HTML Code : 

<select id="selectdata">
<option id="1">Rakesh kumar</option>
<option id="2">Rajesh kumar</option>
<option id="3">Deepak Mathur</option>
</select>

Jquery Code : 

$('#selectdata').change(function () {

$enqid = $('#empid').val();

$.ajax({
url:"php page url",
method:"POST",
data:{empid:$empid},
success:function(data)
{
if(data)
{
$('#searchdiv').html(data);
}
else
{

}

}
});

});

A PHP Error was encountered

Severity: Notice

Message: Undefined offset: 0

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Line Number: 422

Backtrace:

File: /home/hrdv7o2ounf4/public_html/institute-websites/webdevelopmentinstitute.com/application/views/courses-details.php
Line: 422
Function: _error_handler

File: /home/hrdv7o2ounf4/public_html/institute-websites/webdevelopmentinstitute.com/application/controllers/Welcome.php
Line: 653
Function: view

File: /home/hrdv7o2ounf4/public_html/institute-websites/webdevelopmentinstitute.com/index.php
Line: 315
Function: require_once

A PHP Error was encountered

Severity: Notice

Message: Trying to get property of non-object

Filename: views/courses-details.php

Line Number: 422

Backtrace:

File: /home/hrdv7o2ounf4/public_html/institute-websites/webdevelopmentinstitute.com/application/views/courses-details.php
Line: 422
Function: _error_handler

File: /home/hrdv7o2ounf4/public_html/institute-websites/webdevelopmentinstitute.com/application/controllers/Welcome.php
Line: 653
Function: view

File: /home/hrdv7o2ounf4/public_html/institute-websites/webdevelopmentinstitute.com/index.php
Line: 315
Function: require_once

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