Question

If I have valvo that obtain from database, How can I set volvo option status into active(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);

Answer 1

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" />