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Javascript alerts showing multiple times


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Hello,

I have the below code in the footer of a submission datapage, however in some circumstances it is bringing up multiple alert windows with the same message, one after the other. I've probably made a simple error somewhere in the coding, could anyone help?

<script>
 
document.addEventListener('BeforeFormSubmit', function(event) {

 if (event.detail.appKey == 'xxxxxxxxxxxxxxxxxxx') {

     let checkValue1 = document.querySelector("input[id*='InsertRecordno_of_selections_qty1']").value;
    
     if (checkValue1 > '1') {
     event.preventDefault();
     alert("There too many lines selected for Qty 1");
     return false;
    }
}

  if (event.detail.appKey == 'xxxxxxxxxxxxxxxxxxx') {

     let checkValue2 = document.querySelector("input[id*='InsertRecordno_of_selections_qty2']").value;
    
     if (checkValue2 > '1') {
     event.preventDefault();
     alert("There too many lines selected for Qty 2");
     return false;
    }
}

 if (event.detail.appKey == 'xxxxxxxxxxxxxxxxxxx') {

     let checkValue3 = document.querySelector("input[id*='InsertRecordno_of_selections_qty3']").value;
    
     if (checkValue3 > '1') {
     event.preventDefault();
     alert("There too many lines selected for Qty 3");
     return false;
    }
}

 if (event.detail.appKey == 'xxxxxxxxxxxxxxxxxxx') {

     let checkValue4 = document.querySelector("input[id*='InsertRecordno_of_selections_qty4']").value;
    
     if (checkValue4 > '1') {
     event.preventDefault();
     alert("There too many lines selected for Qty 4");
     return false;
    }
}

 if (event.detail.appKey == 'xxxxxxxxxxxxxxxxxxx') {

     let checkValue5 = document.querySelector("input[id*='InsertRecordno_of_selections_qty5']").value;
    
     if (checkValue5 > '1') {
     event.preventDefault();
     alert("There too many lines selected for Qty 5");
     return false;
    }
}
  });
</script>

 

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