# Grab Formula from Website

**URL:** <https://community.openhab.org/t/grab-formula-from-website/50079>\
**Category:** Tutorials & Examples\
**Tags:** parsing, web\
**Created:** [August 25, 2018, 12:55pm UTC](https://community.openhab.org/t/grab-formula-from-website/50079 "2018-08-25T12:55:27Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![sjef86](https://community.openhab.org/user_avatar/community.openhab.org/sjef86/32/80783_2.png) [@sjef86](https://community.openhab.org/u/sjef86)\
**Post date:** [August 25, 2018, 12:55pm UTC](https://community.openhab.org/t/grab-formula-from-website/50079/1 "2018-08-25T12:55:27Z")

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Hi,

Just wondered if anyone on this forum has the time and skill to help med with a solution to grab a formula/calculator from a website. I’ve tried to investigate the source in a browser, but can’t seem to find the exact formula used. Seems to be hidden in a javascript or something 😕  
I would like to use this Calculation in my openhab system, to calculate the lowest possible setpoint for my water coil in my ventilation system.

[https://catalogue2.systemair.com/EPI/EN/item/itemIframe.aspx?itemNo=30022&version=0&tab=coil\_calculation](https://catalogue2.systemair.com/EPI/EN/item/itemIframe.aspx?itemNo=30022&version=0&tab=coil_calculation)

Anyone up for the challange? 🙂

thanks  
Christian

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**Author:** ![crazyfx](https://community.openhab.org/letter_avatar_proxy/v4/letter/c/ccd318/32.png) [@crazyfx](https://community.openhab.org/u/crazyfx)\
**Post date:** [August 29, 2018, 7:01am UTC](https://community.openhab.org/t/grab-formula-from-website/50079/2 "2018-08-29T07:01:44Z")

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As far as I can see the calculation is done on the webserver and not in the browser in JavaScript. So it’s not possible to extract the formula.

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**Author:** ![vzorglub](https://community.openhab.org/user_avatar/community.openhab.org/vzorglub/32/17166_2.png) [@vzorglub](https://community.openhab.org/u/vzorglub)\
**Post date:** [August 29, 2018, 9:51am UTC](https://community.openhab.org/t/grab-formula-from-website/50079/3 "2018-08-29T09:51:31Z")

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I second @crazyfx  
The calculations are not in the the page source I am afraid

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**Author:** ![vzorglub](https://community.openhab.org/user_avatar/community.openhab.org/vzorglub/32/17166_2.png) [@vzorglub](https://community.openhab.org/u/vzorglub)\
**Post date:** [August 29, 2018, 9:56am UTC](https://community.openhab.org/t/grab-formula-from-website/50079/4 "2018-08-29T09:56:42Z")

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Why don’t you ask system air directly?