Ytukyg

I tried editing a similar solution but it doesnt do what it was intended to. Im not sure about my coding maybe im wrong and im using html. Is there a way to hide button(href=) if file exists then show if its not found? thank you!

ref: link

<button type="button" id="test_btn" style="display: none;">Download</button>



<script type="text/javascript">

    $(document).ready(function () {

        checkFile();



        function checkFile() {

            $.ajax({

                url: '/path/to/file_checker.php',

                type: 'GET',

                success: function (data) {

                    if (data === "deleted") { 

                        $('#test_btn').show();

                    }

                    else {

                        $('#test_btn').hidden();

                    }

                }

            });

        }

    }

</script>  

Then your file checker php can be something similar to what you had:

if (file_exists("/aaa/file.txt")) {

    echo "exists";

}

else {

    echo "deleted";

}

<script

              src="https://code.jquery.com/jquery-3.3.1.min.js"

              integrity="sha256-FgpCb/KJQlLNfOu91ta32o/NMZxltwRo8QtmkMRdAu8="

              crossorigin="anonymous">



</script>

Add CSS class to your button and include jquery in your page

.hidden {

display: none

}

then

<button type="button" class="hidden" id="test_btn">Download</button>



<script>

$(document).ready(function () {

                $.ajax({

                url: '/path/to/file_checker.php',

                type: 'GET',

                success:function(data){

                var obj = jQuery.parseJSON(data);

                           if(obj.callback == 1) {

                             $('button#test_btn').removeClass('hidden');

                            }

                }

                });

});

</script>

In your /path/to/file_checker.php

if (file_exists("/aaa/file.txt")) {

    $data = array('callback' => 1);

    echo json_encode($data);

}

else {

    $data = array('callback' => 0);

    echo json_encode($data);

}

A different approach would be to offer a list of the files that exist to the user and allow them to select from the list.

<?php

// Initialize an empty array

$files = ;



// Get all the files in a directory (this will also return directories)

foreach (glob('*') as $f) {



        // If the item is a file, add it to the files array

        if (is_file($f)) {

                $files = $f;

        }

}

?>



<!-- Create a select statement with the files that exist -->

<select id="files">

<!-- Placeholder -->

<option disabled selected>Select file</option>



<!-- Loop through all the files and create options for them -->

<?php foreach ($files as $f) : ?>

<option><?= $f ?></option>

<?php endforeach ?>

</select>



<!-- The button would run the download using the selected file as the source (additional JavaScript required) -->

<button id="go">Download</button>