Question

Populate HTML <select> with JSON data

Asked by: narmi2

Dear Experts,

If I have some data in JSON form, how do I populate a HTML <select> control with this data?

Please help

Thanks

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Asked On
2009-06-24 at 05:49:00ID24517811
Topics

JSON

,

JavaScript

,

JScript

Participating Experts
2
Points
500
Comments
5

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Answers

 

by: MorcalavinPosted on 2009-06-24 at 07:09:43ID: 24701233

Depends on how your JSON is formatted/ Assuming you have just a simple array, the below should work.  It would help if we had an example JSON string and which portion you are wanting to put in the select box.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
</head>
<body>
<select id="names"><option>Default option if JS is disabled</option></select>
<script type="text/javascript">
 
var mySelectBox = document.getElementById('names');
mySelectBox.options.length = 0;
var myNames = ['Bob', 'Sally', 'Tom', 'David', 'Sarah'];  //if this were a json string, you'd have to eval it first
for(var i = 0, e = myNames.length; i < e; ++i) {
    var option = new Option(myNames[i], myNames[i]);
    mySelectBox.options[i] = option;
}
</script>
</body>
</html>

                                              
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Select allOpen in new window

 

by: vakordePosted on 2009-06-24 at 07:18:15ID: 24701322

Check out this code.


<SELECT name="emp" id="EmployeeNames" >
</SELECT

<script>
var employees = { "accounting" : [   // accounting is an array in employees.
                                   { "firstName" : "Vikrant",  // First element
                                     "lastName"  : "Korde",
                                     "id"  : 37461,
                                     "age"       : 29 },
                                   
                                   { "firstName" : "Arun",  // Second Element
                                     "lastName"  : "Jadhav",
                                     "id"  : 37463,
                                     "age"       : 27 }
                                 ], // End "accounting" array.                                  
                 "sales"       : [ // Sales is another array in employees.
                                   { "firstName" : "Sachin", // First Element
                                     "lastName"  : "Deshpande",
                                     "id"  : 37462,
                                     "age"       : 35 },
                                   
                                   { "firstName" : "Sunil",   // Second Element
                                     "lastName"  : "Chavan",
                                     "id"  : 37469,
                                     "age"       : 41 }
                                 ] // End "sales" Array.
               } // End Employees

var selectObj = document.getElementById("EmployeeNames");
selectObj.options[0] = new Option(employees.accounting[0].firstName + " " + employees.accounting[1].lastName, employees.accounting[0].id);
selectObj.options[1] = new Option(employees.accounting[1].firstName + " " + employees.accounting[1].lastName, employees.accounting[1].id);
</script>


 

by: narmi2Posted on 2009-06-29 at 05:28:38ID: 24735489

Morcalavin, that does not work.  my JSON data does not seem to have a length, i.e.

objJSON = eval('('+ results +')');

for(var i = 0, e = objJSON.length; i < e; ++i) {
    alert(objJSON.length);
}

gives me no alert boxes at all!

The following give me nothing too

objJSON = eval('('+ results +')');
alert(objJSON.length);

 

by: MorcalavinPosted on 2009-06-29 at 06:02:52ID: 24735706

Your json will only have the length property if it's an array.  What does you json string look like?

 

by: narmi2Posted on 2009-06-29 at 06:08:46ID: 31618552

Yes, it should have been objJSON.selectbox1.length

20120131-EE-VQP-002

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