How do I programmatically set the value of a select box element using JavaScript?

Question

I have the following HTML element:

Annual Leave&l

Answer 1

Why not add a variable for the element's Id and make it a reusable function?

function SelectElement(selectElementId, valueToSelect)
{    
    var element = document.getElementById(selectElementId);
    element.value = valueToSelect;
}

Answer 2

You can use this function:

selectElement('leaveCode', '11')

function selectElement(id, valueToSelect) {    
    let element = document.getElementById(id);
    element.value = valueToSelect;
}

Answer 3

function foo(value)
{
    var e = document.getElementById('leaveCode');
    if(e) e.value = value;
}

Answer 4

If using PHP you could try something like this:

$value = '11';
$first = '';
$second = '';
$third = '';
$fourth = '';

switch($value) {
            case '10' :
                $first = 'selected';
            break;
            case '11' :
                $second = 'selected';
            break;
            case '14' :
                $third = 'selected';
            break;
            case '17' :
                $fourth = 'selected';
            break;
        }

echo'
<select id="leaveCode" name="leaveCode">
  <option value="10" '. $first .'>Annual Leave</option>
  <option value="11" '. $second .'>Medical Leave</option>
  <option value="14" '. $third .'>Long Service</option>
  <option value="17" '. $fourth .'>Leave Without Pay</option>
</select>';

Answer 5

Suppose your form is named form1:

function selectValue(val)
{
  var lc = document.form1.leaveCode;
  for (i=0; i<lc.length; i++)
  {
    if (lc.options[i].value == val)
    {
        lc.selectedIndex = i;
        return;
    }
  }
}

Answer 6

Should be something along these lines:

function setValue(inVal){
var dl = document.getElementById('leaveCode');
var el =0;
for (var i=0; i<dl.options.length; i++){
  if (dl.options[i].value == inVal){
    el=i;
    break;
  }
}
dl.selectedIndex = el;
}