javascript - jQuery calls a PHP file to get data from mysql database? -


ok have found number of tutorials online , have followed each of them step step. problem know javascript/jquery better know php , cannot figure out how debug going wrong in section. have bunch of buttons , , when button pressed determines default values in form.

jquery side

$(document).ready(function(){ // cspc , addupdate toggle defined globally     $('ul#parts').on('click', 'button', function(){         addupdatetoggle = "add";         cspc = $(this).attr("data-cspc");         var   form = $('div.sidebar form'),               sr = 0;         form.find("#cspc").val(cspc);         $.ajax({             type: "get",             url: "getrate.php",             data: "pid=a5843",             datatype: "json",             success: function(data){                 sr = data;             }         });         form.find("#strokerate").val(sr);         showform();     }); });

php side

<?php  $host = "localhost"; $user = "username"; $pass = "password"; $databasename = "movedb"; $tablename = "part parameters";  $con = mysql_connect($host, $user, $pass); $dbs = mysql_select_db($databasename, $con); //get parameter url $pid=$_get["pid"]; if (empty($pid)){     echo "1"; //default rate } else{     $db=mysql_pconnect("localhost");//connect local database     mysql_select_db("movedb", $db);//select database want use     if (!$db){         echo ("error connecting database");                   }     else{         //connection successful         $sql = "select 'processing rate (ppm)' 'part parameters' 'part number' '" . $pid . "'";//sql string command           $result=mysql_query($sql);//execute sql string command           //result contains rows           $rows = mysql_fetch_row($result)           echo json_encode($rows["processing rate (ppm)"]);      }  }  ?>

any ideas why sr not getting set?

am way off base?

i shamelessly note not know $user , $pass should set to. cannot find explained anywhere

thanks in advance!

edit: followed of directions below , when run 

http://localhost/getrate.php?pid=a5843

it says "no database selected." also, dont have access our original ms access file (one of team members has it) once make headers 1 word headers. our first job web programming/database management learning.

$user , $pass should set mysql user's username , password.

i'd use this:

js

success: function(data){              if(data.status === 1){                  sr = data.rows;              }else{                  // db query failed, use data.message error message              }         }

php:

<?php      $host = "localhost";     $user = "username";     $pass = "password";     $databasename = "movedb";     $tablename = "part parameters";      $con = mysql_pconnect($host, $user, $pass);     $dbs = mysql_select_db($databasename, $con);     //get parameter url     $pid = $_get["pid"];     if(empty($pid)){         echo json_encode(array('status' => 0, 'message' => 'pid invalid.'));     } else{         if (!$dbs){             echo json_encode(array('status' => 0, 'message' => 'couldn\'t connect db'));                }         else{             //connection successful             $sql = "select `processing rate (ppm)` `part parameters` `part number` `" . mysqli_real_escape_string($pid) . "`"; //sql string command             $result = mysql_query($sql) or die(mysql_error());//execute sql string command             if(mysql_num_rows($result) > 0){                 $rows = mysql_fetch_row($result);                 echo json_encode(array('status' => 1, 'rows' => $rows["processing rate (ppm)"]);             }else{                 echo json_encode(array('status' => 0, 'message' => 'couldn\'t find processing rate give pid.'));                }         }      }  ?>

as user said, should try renaming database fields without spaces part parameters => part_parameters, part number => part_number.

if you're still having trouble (as long it's not production server) put @ top of php file:

error_reporting(e_all); ini_set('display_errors', '1');

this output errors , should work out what's going wrong.


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