Check If Specific Input File Is Empty

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;    
        }
  });
});

Check if specific input file is empty

You can check by using the size field on the $_FILES array like so:

if ($_FILES['cover_image']['size'] == 0 && $_FILES['cover_image']['error'] == 0)
{
    // cover_image is empty (and not an error)
}

(I also check error here because it may be 0 if something went wrong. I wouldn't use name for this check since that can be overridden)

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>

Check if file-input[] is empty

if ($_FILES['file_input']){
  foreach($_FILES['file_input']['name'] as $k=>$v){
    if(!empty($_FILES['file_input']['name'][$k])){
       if($_FILES['file_input']['size'][$k]>0){
         // all ok, can be moved ..
       }
    }
  }
}

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" />

If input file is empty select a default file

You can check file is uploaded or not by using below if else condition. if your file is not empty than upload your selected file or if your file is empty upload default image.

if (isset($_FILES['ilyes']) && !empty($_FILES['ilyes']['name']))
{
  //upload your selected file here
}
else
{
 //upload your default file here
}

How to check if the file input field is empty?

if($_FILES["file"]["error"] != 0) {
//stands for any kind of errors happen during the uploading
}

also there is

if($_FILES["file"]["error"] == 4) {
//means there is no file uploaded
}