faie

May 12, 2015

Hi all,

I am new to PHP and a bit slow in understanding ajax, javascript. I want to ask on how to display the table after I select the 3rd dropdown.

I don't know how to start.

//this is ajax-dd3.php file
<!doctype html public "-//w3c//dtd html 3.2//en">
<html>
<head>
<title></title>
<META NAME="DESCRIPTION" CONTENT="">
<META NAME="KEYWORDS" CONTENT="">
<script type="text/javascript">
function ajaxFunction(choice)
{

var httpxml;
try
  {
  // Firefox, Opera 8.0+, Safari
  httpxml=new XMLHttpRequest();
  }
catch (e)
  {
  // Internet Explorer
  try
    {
    httpxml=new ActiveXObject("Msxml2.XMLHTTP");
    }
  catch (e)
    {
    try
      {
      httpxml=new ActiveXObject("Microsoft.XMLHTTP");
      }
    catch (e)
      {
      alert("Your browser does not support AJAX!");
      return false;
      }
    }
  }
function stateChanged() 
    {
    if(httpxml.readyState==4)
      {
//alert(httpxml.responseText);
var myObject = JSON.parse(httpxml.responseText);

for(j=document.myForm.state.options.length-1;j>=0;j--)
{
document.myForm.state.remove(j);
}

var state1=myObject.value.state1;

var optn = document.createElement("OPTION");
optn.text = 'Select State';
optn.value = '';
document.myForm.state.options.add(optn);
for (i=0;i<myObject.state.length;i++)
{
var optn = document.createElement("OPTION");
optn.text = myObject.state[i];
optn.value = myObject.state[i];
document.myForm.state.options.add(optn);

if(optn.value==state1){
var k= i+1;
document.myForm.state.options[k].selected=true;
}
} 

//////////////////////////
for(j=document.myForm.city.options.length-1;j>=0;j--)
{
document.myForm.city.remove(j);
}
var city1=myObject.value.city1;
//alert(city1);
for (i=0;i<myObject.city.length;i++)
{
var optn = document.createElement("OPTION");
optn.text = myObject.city[i];
optn.value = myObject.city[i];
document.myForm.city.options.add(optn);
if(optn.value==city1){
document.myForm.city.options[i].selected=true;
}

} 


///////////////////////////
document.getElementById("txtHint").style.background='#00f040';
document.getElementById("txtHint").innerHTML='done';
//setTimeout("document.getElementById('txtHint').style.display='none'",3000)
    }
    }

var url="ajax-dd3ck.php";
var country=myForm.country.value;
if(choice != 's1'){
var state=myForm.state.value;
var city=myForm.city.value;
}else{
var state='';
var city='';
}
url=url+"?country="+country;
url=url+"&state="+state;
url=url+"&city="+city;
url=url+"&id="+Math.random();
myForm.st.value=state;
//alert(url);
 document.getElementById("txtHint2").innerHTML=url;
httpxml.onreadystatechange=stateChanged;
httpxml.open("GET",url,true);
httpxml.send(null);
 document.getElementById("txtHint").innerHTML="Please Wait....";
document.getElementById("txtHint").style.background='#f1f1f1';
}
</script>


</head>

<body >
</head>

<body>
<div id="txtHint" style="width : 100px;background-color: #cccc33;">Message area</div>
<br><br>
<form name="myForm" action='ajax-dd3-details.php' method='post'">
<input type=hidden name=st value=0>
<table width=500>
<tr><td >
Select Country<br><select name=country id='s1' onchange=ajaxFunction('s1');>
<option value=''>Select One</option>
<?Php
//require "../include/z_db1.php";
require "config.php";// connection to database 
$sql="select distinct country from student5 ";
foreach ($dbo->query($sql) as $row) {
echo "<option value=$row[country]>$row[country]</option>";
}
?>
</select>

</td><td ><select name=state  onchange=ajaxFunction('s2');>
<option value=''>Select One</option></select></td>
<td ><select name=city  onchange=ajaxFunction('s3');>
<option value=''>Select One</option></select></td>
</tr></tr>
<tr><td colspan=3><input type=submit value='Submit'></td></tr>
</form>
</table>
<br><br>
<div id="txtHint2"></div>

</body>
</html>

//this is ajax-dd3ck.php file
<?Php
require "config.php"; // connection details

error_reporting(0);// With this no error reporting will be there
//////////
/////////////////////////////////////////////////////////////////////////////
$country=$_GET['country'];// 
//$country='IND'; // To check you can use this
$state1=$_GET['state'];
$city1=$_GET['city'];
///////////// Validate the inputs ////////////
// Checking country variable ///
if((strlen($country)) > 0 and (!ctype_alpha($country))){ 
echo "Data Error";
exit;
}
// Checking state variable (with space ) ///

if ((strlen($state1)) > 0 and ctype_alpha(str_replace(' ', '', $state1)) === false) {
echo "Data Error";
exit;
}

/////////// end of input validation //////

if(strlen($country) > 0){
$q_country="select distinct(state) from student5 where country = '$country'";
}else{
$q_country="select distinct(state) from student5";
}
//echo $q_country;
$sth = $dbo->prepare($q_country);
$sth->execute();
$state = $sth->fetchAll(PDO::FETCH_COLUMN);

$q_state="select distinct(city) from student5 where ";
if(strlen($country) > 0){
$q_state= $q_state . " country = '$country' ";
}
if(strlen($state1) > 0){$q_state= $q_state . " and  state='$state1'";}
$sth = $dbo->prepare($q_state);
$sth->execute();
$city = $sth->fetchAll(PDO::FETCH_COLUMN);

$main = array('state'=>$state,'city'=>$city,'value'=>array("state1"=>"$state1","city1"=>"$city1"));
echo json_encode($main); 

////////////End of script /////////////////////////////////////////////////////////////////////////////////
?>

//this is ajax-dd3-details.php file
<!doctype html public "-//w3c//dtd html 3.2//en">
<html>
<head>
<title></title>
<META NAME="DESCRIPTION" CONTENT="">
<META NAME="KEYWORDS" CONTENT="">
</head>

<body>
<?Php
echo "Country : $_POST[country]<br>
State : $_POST[state]<br>
City : $_POST[city]<br>
<br><br><br>
Return to <a href=ajax-dd3.php>Drop down list</a>
";
?>

</body>
</html>

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