Question

I have two combo-box:

<select ID="combobox1"></select>
<select ID="combobox2" onChange="get_function(this, #combobox1)"></select>

What I want to do is, passing the value chosen on the combobox1 to the combobox2 and call the Javascript function:

function get_function(combobox1, combobox2)
{
var code1 = combobox1.value;
var code2 = combobox2.value;
if (!code1) return;
if (!code2) return;
alert(code1 + '-' + code2);
}

I have tried that code but it doesn’t work. How can I do that?

---

UPDATE

The problem solved by:

<select ID="combobox1"></select>
<select ID="combobox2" onChange="get_function(this, "combobox1")"></select>

function get_function(combobox1, combobox2)
{
var code1 = combobox1.value;
var code2 = document.getElementById(combobox2);
if (!code1) return;
if (!code2) return;
alert(code1 + '-' + code2);
}

Answer 1

<select ID="combobox1"></select>
<select ID="combobox2" onChange="get_function(this, "combobox1")"></select>

function get_function(combobox1, combobox2)
{
  var code1 = combobox1.value;
  var code2 = document.getElementById(combobox2);
  if (!code1) return;
  if (!code2) return;
  alert(code1 + '-' + code2);
}