"Triggering an event after selecting and opening a file with an input of type file

Question

"Triggering an event after selecting and opening a file with an input of type file

Check out this snippet of HTML code:

<input type="file" id="mysignature_upload" onChange="readURL();"/>

We also have some Javascript code:

function readURL(){
  alert("Hello");
}

A potential issue with this code is that the function readURL is only triggered when a different file is selected. If the same file is selected repeatedly, readURL won't run. Is there an event that can be used to detect when a file is opened or selected, regardless if it's the same one previously selected?

For reference, here is the provided fiddle link: http://jsfiddle.net/vhevhangvhakhikhang/78zcp5u7/

javascript jquery css html

Answer 1

Answer №1

I trust that this meets your needs: example on fiddle

   <input type="file" id="mysignature_upload"/>

    $("#mysignature_upload").click(function (event) {
         $("#mysignature_upload").val("");
    });

    $("#mysignature_upload").on('change',function (event) {
        alert("selected file: " + $("#mysignature_upload").val());
    });

Answer 2

I trust that this meets your needs: example on fiddle

   <input type="file" id="mysignature_upload"/>

    $("#mysignature_upload").click(function (event) {
         $("#mysignature_upload").val("");
    });

    $("#mysignature_upload").on('change',function (event) {
        alert("selected file: " + $("#mysignature_upload").val());
    });

Answer 3

Answer №2

<script>
    $(document).ready(function({
      $("#mysignature_upload").click(function(event){
         event.preventDefault();
         $(this).val("");
      });
    });
</script>

Answer 4

<script>
    $(document).ready(function({
      $("#mysignature_upload").click(function(event){
         event.preventDefault();
         $(this).val("");
      });
    });
</script>

Answer 5

Answer №3

When it comes to the onchange event, it is specifically activated when there is a modification in the field's value. If you are looking to perform an action each time a user chooses a file, one option could be to reset the field's value during the click event.

$("#mysignature_upload").click(function() {
  // Resetting the field value
  $(this).val("");
  }
}

This way, the onchange event will now trigger every time without fail.

Answer 6

When it comes to the onchange event, it is specifically activated when there is a modification in the field's value. If you are looking to perform an action each time a user chooses a file, one option could be to reset the field's value during the click event.

$("#mysignature_upload").click(function() {
  // Resetting the field value
  $(this).val("");
  }
}

This way, the onchange event will now trigger every time without fail.

Answer 7

Answer №4

When you're dealing with large files, there's a noticeable lag between clicking on the Open button in the file dialog and seeing the value update in the input field of type "file." While I typically use the following two events to display and hide a 'please wait' message, you can also perform other tasks within these event handlers:

// Triggered when the file input ('Choose File' button) is clicked
$('#selectedFile').on('click', function (event) {
// Display a 'please wait' message before opening the file selection dialog
ShowPleaseWait();
});

// Triggered when the value of the file input is updated
$('#selectedFile').on('change', function (event) {
// Hide the 'please wait' message once the file input value is updated
HidePleaseWait();
});

Answer 8

When you're dealing with large files, there's a noticeable lag between clicking on the Open button in the file dialog and seeing the value update in the input field of type "file." While I typically use the following two events to display and hide a 'please wait' message, you can also perform other tasks within these event handlers:

// Triggered when the file input ('Choose File' button) is clicked
$('#selectedFile').on('click', function (event) {
// Display a 'please wait' message before opening the file selection dialog
ShowPleaseWait();
});

// Triggered when the value of the file input is updated
$('#selectedFile').on('change', function (event) {
// Hide the 'please wait' message once the file input value is updated
HidePleaseWait();
});

"Triggering an event after selecting and opening a file with an input of type file

Answer №1

Answer №2

Answer №3

Answer №4

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