Innerhtml-select control is inserted through innerHTML, the next question about how to pass the value (PHP)

Innerhtmlphpjquery

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Requirements: The redemption code after the loss, you will get a discount, need to be multiplied with the original price, to get the final real prices
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The price of the select is to use innerHTML, the code is as follows

I am going to determine the validity of the Redemption Code (resolved) when the focus of the input box is left, and to calculate the final price (unresolved), focus off the code as follows

Excuse me: How to transfer the selected value of select (InnerHTML) when the focus leaves? Thank you!!!

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