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Let's assume I have a “products” channel which contains 3 fields: price(number), discount(integer 1 to 100), discounted_price(number).

Is there a way to populate the discounted_price field in CP, based on price - (price * discount / 100)?

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You'll want to handle this using jQuery/JavaScript in your field's instructions.

You can include HTML in the Instructions field for your custom field. So you can include:

<script type="text/javascript">
// Do some stuff
</script>

You can set your code to fire onblur on your fields, so that every time a field is updated, the JS runs, and calculates the value for the other field.

You can do a View Source on the entry screen to find all the field references you need for your jQuery code.

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    This is rather interesting… fairly brilliant solution. I didn't know the description field accepted html/jscript. I'll test it.
    – Milksamsa
    Mar 8, 2013 at 15:24
  • 1
    It's a fairly common solution once it's realized :) Mar 8, 2013 at 15:25

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