How to make an 'order' button that works?

Question

How do I make an 'order' button, by clicking on it, will post a pre-defined product number in a contactform?
Probably I have to use php, but I do not know how to make the correct script.
Regards, Gerald

Answer 1

If you just need it to pop text into a textfield, you can use javascript, something like this might do the trick for you...
<textarea id="TheText"></textarea>
<select id="DropDown">
    <option value="">None</option>
    <option value="text-one">Choice One</option>
    <option value="text-two">Choice Two</option>
    <option value="text-three">Choice Three</option>
    <option value="text-four">Choice Four</option>
</select>
<script type="text/javascript">
    var thetextbox = document.getElementById('TheText');
    var mydropdown = document.getElementById('DropDown');
    mydropdown.onchange = function(){
    thetextbox.value = this.value;
</script>
The script should come after the textbox and dropdown in your HTML.