[jquery] Setting the selected attribute on a select list using jQuery

I have the following HTML:

<select id="dropdown">
    <option>A</option>
    <option>B</option>
    <option>C</option>
</select>

I have the string "B" so I want to set the selected attribute on it so it will be:

<select id="dropdown">
    <option>A</option>
    <option selected="selected">B</option>
    <option>C</option>
</select>

How would I do this in jQuery?

<select id="cars">
<option value='volvo'>volvo</option>
<option value='bmw'>bmw</option>
<option value='fiat'>fiat</option>
</select>

var make = "fiat";

$("#cars option[value='" + make + "']").attr("selected","selected");

You can follow the .selectedIndex strategy of danielrmt, but determine the index based on the text within the option tags like this:

$('#dropdown')[0].selectedIndex = $('#dropdown option').toArray().map(jQuery.text).indexOf('B');

This works on the original HTML without using value attributes.

I'd iterate through the options, comparing the text to what I want to be selected, then set the selected attribute on that option. Once you find the correct one, terminate the iteration (unless you have a multiselect).

 $('#dropdown').find('option').each( function() {
      var $this = $(this);
      if ($this.text() == 'B') {
         $this.attr('selected','selected');
         return false;
      }
 });

You can use pure DOM. See http://www.w3schools.com/htmldom/prop_select_selectedindex.asp

document.getElementById('dropdown').selectedIndex = 1;

but jQuery can help:

$('#dropdown').selectedIndex = 1;

$('#select_id option:eq(0)').prop('selected', 'selected');

its good

If you are using JQuery, since the 1.6 you have to use the .prop() method :

$('select option:nth(1)').prop("selected","selected");

Something along the lines of...

$('select option:nth(1)').attr("selected","selected"); 

Code:

var select = function(dropdown, selectedValue) {
    var options = $(dropdown).find("option");
    var matches = $.grep(options,
        function(n) { return $(n).text() == selectedValue; });
    $(matches).attr("selected", "selected");
};

Example:

select("#dropdown", "B");

This can be a solution

$(document).on('change', 'select', function () {
            var value = $(this).val();
            $(this).find('option[value="' + value + '"]').attr("selected", "selected");
        })