php get selected value from dropdown without submit
<select id="singleSelectValueDDJS" class="form-control"
onchange="singleSelectChangeValue()">
<option value="0">Select Value 0</option>
<option value="8">Option value 8</option>
<option value="5">Option value 5</option>
<option value="4">Option value 4</option>
</select>
<input type="text" id="textFieldValueJS" class="form-control"
placeholder="get value on option select">Copy