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I have a MySql database where part of it handles instrument's depth of water. Each instrument has its own formula of calculation how depth the water when the operator collect the reading I stored the formula for each instrument in database/MySql.

Example formula: [55-57]

this is the simple minus operation, where the number is actually represent the id of a row. How do I represent those number with id of a row and later convert it to javascript readable code. I simply want to do keyup event where everytime user key in something into text field then the other part of HTML would reflect changes based on formula that I fetched from database

FYI, I'm using BackboneJS together with RequireJS

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put on hold as off-topic by John Conde♦ Jun 11 at 15:08

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This apears to be one of the few occasions where you might want to read up on eval(). Use with care ;) –  Martijn Jun 11 at 7:12
    
This question appears to be off-topic because it is about programming which is off-topic at Pro Webmasters. Programming questions may be asked at Stack Overflow but be sure to read their FAQ before posting to ensure your question meets their guidelines. –  John Conde♦ Jun 11 at 15:08
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