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jQuery Set Select Index

Asked 2009-08-14T22:26:58.310
272

I have an select box:

<select id="selectBox">
  <option value="0">Number 0</option>
  <option value="1">Number 1</option>
  <option value="2">Number 2</option>
  <option value="3">Number 3</option>
  <option value="4">Number 4</option>
  <option value="5">Number 5</option>
  <option value="6">Number 6</option>
  <option value="7">Number 7</option>
</select>

I'd like to set one of the options as "selected" based on it's selected index.

For example, if I am trying to set "Number 3", I'm trying this:

$('#selectBox')[3].attr('selected', 'selected');

But this doesn't work. How can I set an option as selected based on it's index using jQuery?

Thanks!

jquery jquery-selectors
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3 Answers

5

The pure javascript selectedIndex attribute is the right way to go because,it's pure javascript and works cross-browser:

$('#selectBox')[0].selectedIndex=4;

Here is a jsfiddle demo with two dropdowns using one to set the other:

<select onchange="$('#selectBox')[0].selectedIndex=this.selectedIndex">
  <option>0</option>
  <option>1</option>
  <option>2</option>
</select>

<select id="selectBox">
  <option value="0">Number 0</option>
  <option value="1">Number 1</option>
  <option value="2">Number 2</option>
</select>

You can also call this before changing the selectedIndex if what you want is the "selected" attribute on the option tag (here is the fiddle):

$('#selectBox option').removeAttr('selected')
   .eq(this.selectedIndex).attr('selected','selected');
answered 2013-06-27T02:01:43.997
1
$('#selectBox option').get(3).attr('selected', 'selected')

When using the above I kept getting errors in webkit (Chrome) saying:

"Uncaught TypeError: Object # has no method 'attr'"

This syntax stops those errors. 

$($('#selectBox  option').get(3)).attr('selected', 'selected');
answered 2011-03-09T11:02:08.277
-2

Shortly:

$("#selectBox").attr("selectedIndex",index)

where index is the selected index as integer.

answered 2012-03-31T21:09:35.240

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