How to set drop down list option up to specific value

If I have valvo that obtain from database, How can I set volvo option status into act开发者_开发问答ive(checked) by using JQuery?

<select name="car">
      <option value="volvo">Volvo</option>
      <option value="saab">Saab</option>
      <option value="mercedes">Mercedes</option>
      <option value="audi">Audi</option>
</select>

I don't know how to manager control that have same identity.

??? $('input[name="car"]').attr('checked', true);

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This also works:

$("select[name=car]").val('volvo');

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Since your example is a drop down list you have to use val()

$("select[name='car']").val('volvo');

If you want to use radio button then you can use

$(":radio[value='volvo']").attr ( "checked" , true );

for the following HTML

<input type="radio" value="volvo" />
<input type="radio" value="saab" />
<input type="radio" value="mercedes" />
<input type="radio" value="audi" />

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$('select[name="car"]').val("volvo");

A select box is different to a radio button, it doesn't have a 'checked' attribute. The above works, although the specific attribute you want to set on the option element is selected:

$('select[name="car"]').attr("selected", "selected");

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Does JQuery support multiple CSS attribute selectors? If so, this should work:

$('input[name=car][value=volvo]').attr('checked', true);

Otherwise, you can always loop through all available radio buttons, check their value, and check them when the value matches.

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This should work for radio buttons as stated on your original question.

$('input[name=car]:radio').attr('checked','checked');

This should work for select

$('select[name=car]').val('volvo');