js取select的值

Question

this.options[this.selectedIndex].value

Answer 1

document.getElementsByName("payway_id")[0].options[document.getElementsByName("payway_id")[0].selectedIndex].value;o 好长

Answer 2

<select name="payway_id" onchange="change_event(this)"> 
<option  value=1>a </option> 
<option  value=2>b </option> 
</select> <script>
function change_event(sef){
    try{
        var orders_id = sef.options[sef.selectedIndex].value;
        location.href='right.php?action=changepayway&orders_id='+orders_id;
    }catch(e){}
}
</script>

Answer 3

<select name="payway_id" onchange="change_event(this.value)">  
<option  value=1>a  </option>  
<option  value=2>b  </option>  
</select>  <script> 
function change_event(iSelect){ 
    try{ 
        location.href='right.php?action=changepayway&orders_id='+iSelect; 
    }catch(e){} 
} 
</script>