Displaying details of student on selection of name from a dropdown listbox using XML & JavaScript

We have already seen how to populate a dropdown list box by using data from a XML file. Here we will develop a script to use the selection of the dropdown listbox to get all details of the student including name, id and class.

We have used onchange event of the dropdown list to trigger a function get_details().

str +="<select id='student_id'  onchange=get_details()>";

Inside this function we will first read the selected student id of the listbox by using getElementById().

var student_id=document.getElementById('student_id').value;

We know how to display all the element of the xml file. We will use one if command to get the matching student record by equating it will looping value of variable i.

for(i=0;i<x.length;i++){
if(y[i].childNodes[0].nodeValue ==student_id){
str1  = str1 +' id = ' + student_id ;
str1 =  str1 + ' , Name : ' + x[i].childNodes[0].nodeValue ; 
str1 =  str1 + ' , Class : ' + z[i].childNodes[0].nodeValue ; 
} // end of if 
} // end of for loop

Then we will display all the other details of the matching student id. We have used our sample xml file

Demo of displaying dropdown list box in xml

Here is the script.

<!doctype html public "-//w3c//dtd html 3.2//en">
<html>
<head>
<title>demo</title>
</head>
<body>

<script type="text/javascript">
function get_details(){
var student_id=document.getElementById('student_id').value;
var z=xml_str.getElementsByTagName("class");
str1='';
for(i=0;i<x.length;i++){
if(y[i].childNodes[0].nodeValue ==student_id){
str1  = str1 +' id = ' + student_id ;
str1 =  str1 + ' , Name : ' + x[i].childNodes[0].nodeValue ; 
str1 =  str1 + ' , Class : ' + z[i].childNodes[0].nodeValue ; 
} // end of if 
} // end of for loop

document.getElementById('disp').innerHTML=str1;

//alert(str1);

}
if (window.XMLHttpRequest)
  {  my_xml=new XMLHttpRequest();
  }
else
  {
  my_xml=new ActiveXObject("Microsoft.XMLHTTP");
  }
/////////////////////////////

my_xml.open("GET",'../php_tutorial/file-xml-demo.xml',false);
my_xml.send();
xml_str=my_xml.responseXML; 

var x=xml_str.getElementsByTagName("name"); 
var y=xml_str.getElementsByTagName("id");
var str="";
str +="<select id='student_id'  onchange=get_details()>";
for(i=0;i<x.length;i++){
str +='<option value=' + y[i].childNodes[0].nodeValue + '>' + x[i].childNodes[0].nodeValue + '</option>'; 
}
str +='</select>';
document.write(str);

</script>

<div id='disp'></div>

</body>
</html>

Dropdown listbox in XML
XML

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Demo of displaying details on selection of student from a listbox

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