What PHP syntax can I use to calculate or compute fields and automatically displays the result inside a form?

Question

without pressing anything then when it displays the result on a certain fields inside a form then pressing the submit button it will be save to mysql database.... I know already the saving but the computation syntax inside the form... how?

Answer 1

If I understand your question correctly, what you want to do is something like this:

In Textbox A, someone enters a number, such as 30.

In Textbox B, someone enters another number, such as 12

In Textbox C, someone enters another number, such as .5

Textbox D then shows the result of (Textbox A - Textbox B) * Textbox C.

When the user submits the form, the value of Textbox D is saved to the database.

To do that, you would use a combination of JavaScript and PHP.

I am working on a demo and will post an update with code in about 1-2 hours.

UPDATE:

http://www.dougv.com/blog/2007/01/01/using-php-mysql-to-store-a-form-value-calculated-via-javascript-dom/

Answer 2

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