How to Check If Input File Is Empty in Jquery

How to check if input file is empty in jQuery

Just check the length of files property, which is a FileList object contained on the input element

if( document.getElementById("videoUploadFile").files.length == 0 ){
console.log("no files selected");
}

Using jQuery to tell if file input field is empty

<input type="file" name="blog-entry-image" id="blog-entry-image" />

$(document).ready(function (){
$("#blog-entry").click(function() {
var fileInput = $.trim($("#blog-entry-image").val());
if (fileInput && fileInput !== '') {
$("#sending").show();
return true;
}
});
});

How to check if input file is empty in jquery without using another button

You can set a listener on the input and change the content of message as follows:

$( document ).ready(function(){     $('#image').on('change', function(){          $('#message').html('You selected an image');     });});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script><input type="file" name="picture" id="image" /><div id="message">Add image</div>

Better way to check if some inputs type file is empty in jquery?

It matches three because :empty matches an element with no descendants, and am input element by definition cannot have descendants (so all are empty, and therefore match the :empty selector).

To find those elements without selected files, I'd suggest:

$("input[type='file'][name*='-files']").filter(function (){
return !this.value
}).length;

References:

  • :empty selector.
  • filter().

get the value of input type file , and alert if empty

<script type="text/javascript">
$(document).ready(function() {
$('#upload').bind("click",function()
{
var imgVal = $('#uploadImage').val();
if(imgVal=='')
{
alert("empty input file");

}
return false;

});
});
</script>

<input type="file" name="image" id="uploadImage" size="30" />
<input type="submit" name="upload" id="upload" class="send_upload" value="upload" />

check if input file filed is empty jquery

Change:

if($($input == '')) {

To:

if($input == '') {

Since it is simple variable that holds text, you don't need to use jQuery function over it again.

JQuery: need to hide div if input file is empty

  1. You had a typo (variables are case sensitive - fileName !== filename).
  2. I added the show part:

alert( "Animation complete." );$(function () {    $("input:file").change(function () {        var fileName = $(this).val();        if (fileName != "") {            $("#instrucciones-adicionales").hide();        } else {            $("#instrucciones-adicionales").show();        }    });});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script><main role="main">

<form method="post" enctype="multipart/form-data"> <input type="hidden" name="csrfmiddlewaretoken" value="Ka5bun8eHCmm5pReR7M9JCOxP8YxVq1sBfi79yqnXFEFWEksDE8WSDfgiYxf2KDb">
<div class="form-group">
<div id="div_id_imagenes" class="form-group">
<label for="id_imagenes" class="col-form-label requiredField"> Imagenes<span class="asteriskField">*</span> </label>

<div class=""> <input type="file" name="imagenes" class="clearablefileinput" required id="id_imagenes">
</div>

</div>
<div id="instrucciones-adicionales" style="display: none">
<p class="bold-font"> Instrucciones adicionales (opcional):</p>

<div id="div_id_instrucciones" class="form-group"> <label for="id_instrucciones" class="col-form-label requiredField"> Instrucciones<span class="asteriskField">*</span> </label>



<div class=""> <textarea name="instrucciones" cols="40" rows="10" class="textarea form-control" required id="id_instrucciones"> </textarea>

</div>

</div>




</div> </div>

</br> </br>
<p>O, sáltate este paso y envía tu arte por correo electrónico</p>

<button type="submit" class="btn btn-naranja text-white btn-block">Continuar </button>

</form>
</main>

How to check input file is empty, and also display an alert if png format is selected using jquery

See the sample I have created:

http://jsfiddle.net/G7xke/


<form>
<input type="file" name="files" id="file1" style="color:White" />
<input type="submit" value="Create" />
</form>
<button value="check" id="check" name="check" >check</button>

And JavaScript:

$("#check").click(function(){
var fileName = $("#file1").val();
if(fileName.lastIndexOf("png")===fileName.length-3)
alert("OK");
else
alert("Not PNG");
})

jquery detect input file type return empty

OK, the Fiddle you added clarified your question considerably.

Essentially what you're looking for is a callback function to run when the file input dialog closes. Unfortunately, there is no standard browser implementation of a file upload API that would help you with this. However, based on this specific use case, I think there's a work-around.

The change event on a file upload input will only run if the value actually changes, not every time the dialog is opened and closed. So in the code you have now, the change event never fires because the value of the input never actually changes, it just stays empty. So if you move your code to show the input out of the click handler for the button and into the change handler for the file input, you can achieve the functionality you're looking for.

$('button').click(function () {
$(".file-upload").click();
});

// if the dialog returns a file, then show the file input field
$(".file-upload").on('change', function (e) {
if (e.target.files.length) {
$(this).show();
} else {
$(this).hide();
}
});

Really, the else block in there shouldn't be necessary, but I guess it's theoretically possible for someone to add a file and then remove it (I don't know if this is even supported functionality in most browsers), and the else block here covers that case.



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