What is the best way to add options to a select from a JavaScript object with jQuery?

The same as other answers, in a jQuery fashion:

$.each(selectValues, function(key, value) {   
     $('#mySelect')
         .append($("<option></option>")
                    .attr("value", key)
                    .text(value)); 
});

---

var output = [];

$.each(selectValues, function(key, value)
{
  output.push('<option value="'+ key +'">'+ value +'</option>');
});

$('#mySelect').html(output.join(''));

In this way you "touch the DOM" only one time.

I'm not sure if the latest line can be converted into $('#mySelect').html(output.join('')) because I don't know jQuery internals (maybe it does some parsing in the html() method)

---

This is slightly faster and cleaner.

var selectValues = { "1": "test 1", "2": "test 2" }; var $mySelect = $('#mySelect'); // $.each(selectValues, function(key, value) { var $option = $("", { value: key, text: value }); $mySelect.append($option); });

---

jQuery

var list = $("#selectList");
$.each(items, function(index, item) {
  list.append(new Option(item.text, item.value));
});

Vanilla JavaScript

var list = document.getElementById("selectList");
for(var i in items) {
  list.add(new Option(items[i].text, items[i].value));
}

---

If you don't have to support old IE versions, using the Option constructor is clearly the way to go, a readable and efficient solution:

$(new Option('myText', 'val')).appendTo('#mySelect');

It's equivalent in functionality to, but cleaner than:

$("<option></option>").attr("value", "val").text("myText")).appendTo('#mySelect');

---

This looks nicer, provides readability, but is slower than other methods.

$.each(selectData, function(i, option)
{
    $("<option/>").val(option.id).text(option.title).appendTo("#selectBox");
});

If you want speed, the fastest (tested!) way is this, using array, not string concatenation, and using only one append call.

auxArr = [];
$.each(selectData, function(i, option)
{
    auxArr[i] = "<option value='" + option.id + "'>" + option.title + "</option>";
});

$('#selectBox').append(auxArr.join(''));

---

A refinement of older @joshperry's answer:

It seems that plain .append also works as expected,

$("#mySelect").append(
  $.map(selectValues, function(v,k){

    return $("<option>").val(k).text(v);
  })
);

or shorter,

$("#mySelect").append(
  $.map(selectValues, (v,k) => $("<option>").val(k).text(v))
  // $.map(selectValues, (v,k) => new Option(v, k)) // using plain JS
);

---

All of these answers seem unnecessarily complicated. All you need is:

var options = $('#mySelect').get(0).options;
$.each(selectValues, function(key, value) {
        options[options.length] = new Option(value, key);
});

That is completely cross browser compatible.

---

Be forwarned... I am using jQuery Mobile 1.0b2 with PhoneGap 1.0.0 on an Android 2.2 (Cyanogen 7.0.1) phone (T-Mobile G2) and could not get the .append() method to work at all. I had to use .html() like follows:

var options;
$.each(data, function(index, object) {
    options += '<option value="' + object.id + '">' + object.stop + '</option>';
});

$('#selectMenu').html(options);

---

 var output = [];
 var length = data.length;
 for(var i = 0; i < length; i++)
 {
    output[i++] = '<option value="' + data[i].start + '">' + data[i].start + '</option>';
 }

 $('#choose_schedule').get(0).innerHTML = output.join('');

I've done a few tests and this, I believe, does the job the fastest. :P

---

There's an approach using the Microsoft Templating approach that's currently under proposal for inclusion into jQuery core. There's more power in using the templating so for the simplest scenario it may not be the best option. For more details see Scott Gu's post outlining the features.

First include the templating js file, available from github.

<script src="Scripts/jquery.tmpl.js" type="text/javascript" />

Next set-up a template

<script id="templateOptionItem" type="text/html">
    <option value=\'{{= Value}}\'>{{= Text}}</option>
</script>

Then with your data call the .render() method

var someData = [
    { Text: "one", Value: "1" },
    { Text: "two", Value: "2" },
    { Text: "three", Value: "3"}];

$("#templateOptionItem").render(someData).appendTo("#mySelect");

I've blogged this approach in more detail.

---

I have made something like this, loading a dropdown item via Ajax. The response above is also acceptable, but it is always good to have as little DOM modification as as possible for better performance.

So rather than add each item inside a loop it is better to collect items within a loop and append it once it's completed.

$(data).each(function(){
    ... Collect items
})

Append it,

$('#select_id').append(items); 

or even better

$('#select_id').html(items);

---

The simple way is:

$('#SelectId').html("<option value='0'>select</option><option value='1'>Laguna</option>");

---

Most of the other answers use the each function to iterate over the selectValues. This requires that append be called into for each element and a reflow gets triggered when each is added individually.

Updating this answer to a more idiomatic functional method (using modern JS) can be formed to call append only once, with an array of option elements created using map and an Option element constructor.

Using an Option DOM element should reduce function call overhead as the option element doesn't need to be updated after creation and jQuery's parsing logic need not run.

$('mySelect').append($.map(selectValues, (k, v) => new Option(k, v)))

This can be simplified further if you make a factory utility function that will new up an option object:

const newoption = (...args) => new Option(...args)

Then this can be provided directly to map:

$('mySelect').append($.map(selectValues, newoption))

Previous Formulation

Because append also allows passing values as a variable number of arguments, we can precreate the list of option elements map and append them as arguments in a single call by using apply.

$.fn.append.apply($('mySelect'), $.map(selectValues, (k, v) => $("<option/>").val(k).text(v)));

It looks like that in later versions of jQuery, append also accepts an array argument and this can be simplified somewhat:

$('mySelect').append($.map(selectValues, (k, v) => $("<option/>").val(k).text(v)))

---

function populateDropdown(select, data) {   
    select.html('');   
    $.each(data, function(id, option) {   
        select.append($('<option></option>').val(option.value).html(option.name));   
    });          
}   

It works well with jQuery 1.4.1.

For complete article for using dynamic lists with ASP.NET MVC & jQuery visit:

Dynamic Select Lists with MVC and jQuery

---

There's a sorting problem with this solution in Chrome (jQuery 1.7.1) (Chrome sorts object properties by name/number?) So to keep the order (yes, it's object abusing), I changed this:

optionValues0 = {"4321": "option 1", "1234": "option 2"};

to this

optionValues0 = {"1": {id: "4321", value: "option 1"}, "2": {id: "1234", value: "option 2"}};

and then the $.each will look like:

$.each(optionValues0, function(order, object) {
  key = object.id;
  value = object.value;
  $('#mySelect').append($('<option>', { value : key }).text(value));
}); 

---

Rather than repeating the same code everywhere, I would suggest it is more desirable to write your own jQuery function like:

jQuery.fn.addOption = function (key, value) {
    $(this).append($('<option>', { value: key }).text(value));
};

Then to add an option just do the following:

$('select').addOption('0', 'None');

---

You can just iterate over your json array with the following code

$('<option/>').attr("value","someValue").text("Option1").appendTo("#my-select-id");

---

$.each is slower than a for loop Each time, a DOM selection is not the best practice in loop $("#mySelect").append();

So the best solution is the following

If JSON data resp is

[
    {"id":"0001", "name":"Mr. P"},
    {"id":"0003", "name":"Mr. Q"},
    {"id":"0054", "name":"Mr. R"},
    {"id":"0061", "name":"Mr. S"}
]

use it as

var option = "";
for (i=0; i<resp.length; i++) {
    option += "<option value='" + resp[i].id + "'>" + resp[i].name + "</option>";
}
$('#mySelect').html(option);

---

Yet another way of doing it:

var options = [];    
$.each(selectValues, function(key, value) {
    options.push($("<option/>", {
        value: key,
        text: value
    }));
});
$('#mySelect').append(options);

---

if (data.length != 0) {
    var opts = "";
    for (i in data)
        opts += "<option value='"+data[i][value]+"'>"+data[i][text]+"</option>";

    $("#myselect").empty().append(opts);
}

This manipulates the DOM only once after first building a giant string.

---

That's what I did with two-dimensional arrays: The first column is item i, add to innerHTML of the <option>. The second column is record_id i, add to the value of the <option>:

PHP $items = $dal->get_new_items(); // Gets data from the database $items_arr = array(); $i = 0; foreach ($items as $item) { $first_name = $item->first_name; $last_name = $item->last_name; $date = $item->date; $show = $first_name . " " . $last_name . ", " . $date; $request_id = $request->request_id; $items_arr[0][$i] = $show; $items_arr[1][$i] = $request_id; $i++; } echo json_encode($items_arr); JavaScript/Ajax function ddl_items() { if (window.XMLHttpRequest) { // Code for Internet Explorer 7+, Firefox, Chrome, Opera, and Safari xmlhttp=new XMLHttpRequest(); } else{ // Code for Internet Explorer 6 and Internet Explorer 5 xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); } xmlhttp.onreadystatechange=function() { if (xmlhttp.readyState==4 && xmlhttp.status==200) { var arr = JSON.parse(xmlhttp.responseText); var lstbx = document.getElementById('my_listbox'); for (var i=0; i

---

Although the previous answers are all valid answers - it might be advisable to append all these to a documentFragmnet first, then append that document fragment as an element after...

See John Resig's thoughts on the matter...

Something along the lines of:

var frag = document.createDocumentFragment();

for(item in data.Events)
{
    var option = document.createElement("option");

    option.setAttribute("value", data.Events[item].Key);
    option.innerText = data.Events[item].Value;

    frag.appendChild(option);
}
eventDrop.empty();
eventDrop.append(frag);

---

A jQuery plugin could be found here: Auto-populating Select Boxes using jQuery & AJAX.

---

I found that this is simple and works great.

for (var i = 0; i < array.length; i++) {
    $('#clientsList').append($("<option></option>").text(array[i].ClientName).val(array[i].ID));
};

---

The JSON format:

[{
    "org_name": "Asset Management"
}, {
    "org_name": "Debt Equity Foreign services"
}, {
    "org_name": "Credit Services"
}]

And the jQuery code to populate the values to the Dropdown on Ajax success:

success: function(json) {
    var options = [];
    $('#org_category').html('');  // Set the Dropdown as Blank before new Data
    options.push('<option>-- Select Category --</option>');
    $.each(JSON.parse(json), function(i, item) {
        options.push($('<option/>',
        {
           value: item.org_name, text: item.org_name
        }));
    });
    $('#org_category').append(options);  // Set the Values to Dropdown
}

---

Using the $.map() function, you can do this in a more elegant way:

$('#mySelect').html( $.map(selectValues, function(val, key){
    return '<option value="' + val + '">'+ key + '</option>';
}).join(''));

---

<!DOCTYPE html>
<html lang="en">
<head>
  <title>append selectbox using jquery</title>
  <meta charset="utf-8">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

  <script type="text/javascript">
    function setprice(){
        var selectValues = { "1": "test 1", "2": "test 2" };
        $.each(selectValues, function(key, value) {   
     $('#mySelect')
         .append($("<option></option>")
                    .attr("value",key)
                    .text(value)); 
});

    }
  </script>
</head>
<body onload="setprice();">


      <select class="form-control" id="mySelect">
    <option>1</option>
    <option>2</option>
    <option>3</option>
    <option>4</option>
  </select>


</body>
</html>

---

I combine the two best answers into a great answer.

var outputConcatenation = [];

$.each(selectValues, function(i, item) {   
     outputConcatenation.push($("<option></option>").attr("value", item.key).attr("data-customdata", item.customdata).text(item.text).prop("outerHTML"));
});

$("#myselect").html(outputConcatenation.join(''));

---

$.each(selectValues, function(key, value) {
    $('#mySelect').append($("<option/>", {
        value: key, text: value
    }));
});

---