Question

PHP is executed first before JS, but is there an easy way to output a confirmation dialog (like Javascript confirmation) if the data is not empty like in this conditional PHP statement:

<?php
if (!empty($data)) {

//data is not empty
//Ideally I want to show a confirmation dialog in this part to the user
//to confirm if the user wants to overwrite the existing data

//If the user confirms
//Overwrite the existing data here

} else {

//data is empty,proceed to other task
//don't show any dialog

}

I don’t want to add another form to the user, just a simple confirmation dialog like the JS confirm. Or is there a PHP replacement function for this? Thanks.

Answer 1

I like to separate the data and the code, so I like to create a JS variable from PHP

// I always use json_encode when creating JS variables from PHP to avoid
// encoding issues with new lines and quotes.
var isDataEmpty = <?php echo json_encode(empty($data)); ?>;

if (!isDataEmpty) {
   if (confirm("Some message")) {
      overwriteExistingData();
   }
} else {
   // proceed
}