AJAX返回总是false，如何设置PHP false

Question

I am beginner in study AJAX.

here is PHP for post action of my form, but somehow it always return false.

<?php
session_start();
include"../connection/sambung.php";

$us=$_SESSION['username'];

if ($_SERVER['REQUEST_METHOD'] == 'POST') { //halaman ini harus dipanggil melalui post
$id = $_POST["id"];
$code = $_POST["code"];
$act = $_POST["act"];

switch($act){
//tambah data
case "insert":$sql="INSERT INTO karyawan(nip,nama)VALUES('".$nip."','".$nama."')";$i='1';break;
//edit data
case "validate":$sql="UPDATE member SET validasi=1 WHERE id_member ='".$id."' and kode_member='".$code."'";$i='2';break;
//hapus data
case "delete":$sql="DELETE FROM karyawan WHERE nip = '".$nip."'";$i='2';break;
}
//eksekusi sql
$kueri = mysql_query($sql);

//tampilkan hasil
if($i=='1'){
    if(mysql_num_rows($kueri)){echo "success";}
}
else if($i=='2'){
    if (mysql_affected_rows($kueri)){echo "success";}
    }
else{
    echo "failed";
    }
}else{
echo "This link can't run directly.";
}
?>

and the AJAX configuration as follow:

$( "#dialog-validate" ).dialog({
    autoOpen: false,
    height: 200,
    width: 350,
    modal: true,
    buttons: {
    "Validate": function() {
    var
    aid = $("#idedit").html();
    acode = $("input#codeedit").val();
    aact= 'validate';
    $("#waiting").show();
    $.ajax({
    type: "POST",
    url: "applicant/check.php",
    data: {"id":aid,"code":acode,"act":aact},
    timeout: 3000,
    beforeSend: function(){},
    complete: function(){},
    cache: false,
    success: function(result){
    if (result=='success'){
    //ubah isi data table sesuai dengan perubahan yang terjadi
    objRow.find(".valcell").html("Yes");
    $("#waiting").hide();

    }else{alert('gagal simpan data');$("#waiting").hide();}
    },
    error: function(error){$("#waiting").hide();alert(error);}
    }
    );

    $( this ).dialog( "close" );

    },
    Cancel: function() {
    $( this ).dialog( "close" );
    }
    }
    });

what I need is how to make

success: function(result){
    if (result=='success'){

result false, I have been changing it many times, PHP or AJAX error? please help

Answer 1

It looks like you're checking for an error code inside your success function. If your script returns an HTTP 200 OK header, success will be invoked. Try setting an error header so that your error function is invoked.

This doesn't answer your question exactly I'm afraid, but it's going to make your code easier to read and could very well solve your problem.