Discount code fields

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This is the code I have. Everything works aside from the actual query. Any value entered in the input will show group8 and subtract 15 on total.

export function button64_click(event, $w) {
wixData.query('DiscountCodes') 

 // Query the collection for any items whose "Name" field contains  
 // the value the user entered in the input element
  .contains('backToschool', $w('#input3').value)
  .find()  // Run the query
  .then(res => {   
 // Set the table data to be the results of the query     
    $w('#group8').show();
    total = 15; 
calc()
  } );
}