Your jquery condition will be totally depend on the type of data returned from the php function. Let's check for the example:-
Example 1 :-
If your php code is :-
<?php
if(isset($_GET['id'])){ // check id coming from `ajax` or not
$data = 1; // as you said
}
echo $data;
?>
Then jquery will be:-
<script src="https://code.jquery.com/jquery-1.12.0.min.js"></script><!-- library needed-->
<script type = "text/javascript">
$(document).ready(function() {
$('#myHref').change(function(){ // you need to check that it is working or not because i don't know from where it is coming
var value = $('#myHref').val(); // same as above check yourself.
$.get('get_sales_price.php','',function(data){
if(data ==1){
alert('hello');
}else{
alert('hi');
}
});
});
});
</script>
Example 2:-
But if your php code is like below:-
<?php
if(isset($_GET['id'])){ // check id coming from `ajax` or not
$data = Array('a'=>1,'b'=>2);
}
echo json_encode($data);
?>
then jquery will be like below:-
<script src="https://code.jquery.com/jquery-1.12.0.min.js"></script>
<script type = "text/javascript">
$(document).ready(function() {
$('#myHref').change(function(){
var value = $('#myHref').val();
$.get('get_sales_price.php','',function(data){
var newdata = $.parseJSON(data);//parse JSON
if(newdata.a ==1 && newdata.b !== 1){
alert('hello');
}else{
alert('hi');
}
});
});
});
</script>
Note:- these are simple examples, but conditions will vary in jquery, based on returned response from php. thanks.