Restrict the Submit Action of a Suitelet Depending on User Action

When a user uploads a file via Suitelet and clicks Submit, they want to display a message before the changes are committed into their NetSuite account. If a user clicks Ok, proceed with the first file. If user clicks Cancel, they should be able to re-upload the file.

1. Create a client side script and specify a Save Record function by navigating to Customization > Scripting > Scripts > New > Client. Sample Save Record function below:

function csSuiteletSaveRecord(){
  var checked = confirm('Are you sure you want to submit this record?');
  if (checked){ 
     return true;
  } else { 
     return false;
  }
}
 
2. Create a sample suitelet by navigating to Customization > Scripting > Scripts > New > Suitelet. Sample code below:

function sampleSuitelet(request, response){

  if(request.getMethod() == 'GET'){

     var formSS = nlapiCreateForm('Simple Suitelet Form', false);
     var fldSampleTextEntry = formSS.addField('custpage_sampletext_entry', 'text', 'Enter Sample Text', null);
     fldSampleTextEntry.setDefaultValue('Default Valuess');
     fldSampleTextEntry.setDisplayType('normal');

     //Set form Script - which is a client side script
     formSS.setScript('customscript69'); //specify ID
     formSS.addSubmitButton('Submit');
     response.writePage(formSS);
  }else{
     arrParams = new Array();
     arrParams['custparam_sampletext_entry'] = request.getParameter('custpage_sampletext_entry'); 
     var intCustomerId = request.getParameter('custparam_custid');
     nlapiSetRedirectURL('RECORD', 'customer', intCustomerId, true, arrParams);
  }

}
 
Note: The key here is to set the form script context of the suitelet and specify a Save Record function. Specify a confirm pop-up via Javascript.