select onchange value code example
Example 1: .on change get value
$('select').on('change', function() {
alert( this.value );
});
Example 2: onchange on select tag
<select id="comboA" onchange="getComboA(this)">
<option value="">Select combo</option>
<option value="Value1">Text1</option>
<option value="Value2">Text2</option>
<option value="Value3">Text3</option>
</select>
Example 3: js html textbox on change
<input type="text" onkeydown="keydownFunction()"
onkeyup="keyupFunction()" onchange="changeFunction()">
Example 4: select onchange pass elemnt
<select onchange="doSomething(this)">