Question

I’m implimenting a user registrations form for a college..There I need to calculate the fees and show it to the user and the same time need to insert to a database..

I have used a list box for like this

<select name="subject" id="select2"> ***(value=fees for the subject)
<option value="100">Arts</option>
<option value="150">English</option>

calculation is OK with the values wich are given(I used javascript calculation for that)
Now I want to insert the subject to database
ex:

INSERT INTO user(name, email, subject)
VALUES ('$_POST[name]','$_POST[email]','$_POST[subject]')");

I want to add the subject which selected to be add to database subject field as English not the fees.

I hope you can understand what I’m telling.Please Help

Thank You

Answer 1

Ideally you should use the labels as values like:

<select name="subject">
<option value="Arts">Arts</option>
<option value="English">English</option>

If for any reason you want to post both label and fee you can use hidden variables and JavaScript like:

<select name="subject_fee" id="subject_fee" onchange="populate_subject_name();">
<option value="100">Arts</option>
<option value="150">English</option>
</select>
<input type="hidden" name="subject_name" id="subject_name" value="">
<script type="text/javascript">
    function populate_subject_name() {
        var f = document.getElementById("subject_fee");
        var n = document.getElementById("subject_name");
        n.value = f.options[f.selectedIndex].text;
    }
</script>

By the way I’d still recommend the first approach. There are other ways to calculate the fee — just improvise. See this and this for one possibility.