[jquery] jQuery Set Selected Option Using Next

How can I, using jQuery, set the "next" item of an already selected item as "selected."

For example, if I have:

<select>
<option value="1" >Number 1</option>
<option value="2" selected="selected">Number 2</option>
<option value="3" >Number 3</option>
<option value="4" >Number 4</option>
</select>

We can see that "Number 2" is selected, and using jQuery, I'd like to set "Number 3" as selected, and remove the selected "attribute" from "Number 2". I'm assuming I need to use the next selector, but I'm not quite sure how to implement.

$('your_select option:selected').next('option').prop('selected', true)

$('#next').click( function(){
    $('#colored_background option:selected').next('option').attr('selected', 'selected');
    changeBackgroundColor();
});

Working at What is my favorite color?. Click on the arrows.

$('#my_sel').val($('#my_sel option:selected').next().val());
$('#my_sel').val($('#my_sel option:selected').prev().val());

And if you want to specify select's ID:

$("#nextPageLink").click(function(){
  $('#myselect option:selected').next('option').attr('selected', 'selected');
  $("#myselect").change();
});

If you click on item with id "nextPageLink", next option will be selected and onChange() event will be called. It may look like this:

$("#myselect").change(function(){
  $('#myDivId').load(window.location.pathname,{myvalue:$("select#myselect").val()});
});

OnChange() event uses Ajax to load something into specified div.

window.location.pathname = actual address

OnChange() event is defined because it allowes you to change value not only using netx/prev button, but directly using standard selection. If value is changed, page does somethig automatically.

From version 1.6.1 on, it's advisable to use the method prop for boolean attributes/properties such as selected, readonly, enabled,...

var theValue = "whatever";
$("#selectID").val( theValue ).prop('selected',true);

For more info, please refer to to http://blog.jquery.com/2011/05/12/jquery-1-6-1-released/

Update:

As of jQuery 1.6+ you should use prop() instead of attr() in this case.

The difference between attributes and properties can be important in specific situations. Before jQuery 1.6, the .attr() method sometimes took property values into account when retrieving some attributes, which could cause inconsistent behavior. As of jQuery 1.6, the .prop() method provides a way to explicitly retrieve property values, while .attr() retrieves attributes.

var theValue = "whatever";
$("#selectID").val( theValue ).prop('selected',true);

Original Answer:

If you want to select by the value of the option, REGARDLESS of its position (this example assumes you have an ID for your select):

var theValue = "whatever";
$("#selectID").val( theValue ).attr('selected',true);

You do not need to "unselect". That happens automatically when you select another.

This is what i just used, i like how clean it is :-)

$('select').val(function(){
    var nextOption = $(this).children(':selected').next();
    return $(nextOption).val();
}).change();

you can use

$('option:selected').next('option')

or

$('option:selected + option')

And set the value:

var nextVal = $('option:selected + option').val();
$('select').val(nextVal);

Find the row, then

var row = $('#yourTable');

the value you want to select

var theValue = "5";
row.find("select:eq(2)").find("option[value="+theValue+']').attr('selected','selected');

  $("select").prop("selectedIndex",$("select").prop("selectedIndex")+1)