php post not able to grap element which append by using jquery - php

Question

here is my code, hope you all can understand.
[html form coding]
<form method='post' action='pro/handle.php'><br/>
<input type='text' name='FirstTXT' value='First'>
<button type='button' name='ADDINPUT'>add</button>
<div id='SETSET'>
<!-- prepare for adding input element by using jquery -->
</div>
<input type='text' name='LastTXT' value='Last'>
<button type='submit' name='BTN' value='Submit'>submit</button>
</form>
[Jquery coding]
$(document).on("click","[name=ADDINPUT]",function(){
var inp = "<input type='text' name='ADDTXT'>";
$("#SETSET").append(inp);
});
So far NO error/problem for the code above(tested), jquery input did append into #SETSET accordingly.[The problem is]
after click on form [submit] button, php NOT able to get the element of [ADDTXT]when i use php to loop & get everything from previous page, result as below:-
[PHP coding]
foreach($_post as $key=>$val){
echo "<br/>$key : $val";
}
[Result]
FirstTXT : First<br/>
LastTXT : Last<br/>
BTN : Submit<br/>
//=== Missing ADDTXT (between First & Last)===//
Did you guys/gals know why?

Answer 1

Maybe that:
html:
<form method='post' action='pro/handle.php'><br/>
<input type='text' name='FirstTXT' value='First'>
<button type='button' name='ADDINPUT'>add</button>
<div id='SETSET' style='display: none;'>
<!-- prepare for adding input element by using jquery -->
<input type='text' id='ADDTXT' name='ADDTXT' disabled='disabled'>
</div>
<input type='text' name='LastTXT' value='Last'>
<button type='submit' name='BTN' value='Submit'>submit</button>
</form>
and JS:
$(document).on("click","[name=ADDINPUT]",function(){
$("#SETSET").show();
$("#ADDTXT").removeAttr("disabled");
});

Answer 2

You have an array from that field.
Replace:
var inp = "<input type='text' name='ADDTXT'>";
With:
var inp = "<input type='text' name='ADDTXT[]'>";
And PHP:
if(is_array($val)) { print_r($val); }
OR try:
var no = 0;
$(document).on("click","[name=ADDINPUT]",function(){
++no;
var inp = "<input type='text' name='ADDTXT"+ no +"'>";
$("#SETSET").append(inp);
});