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I'm building a simple drag n' drop uploader and I'm wondering why I can't see the file(s) I drop when I console.log(e) (DragEvent) and look at the DragEvent.dataTransfer.files it shows up empty, but... if I console.log(e.dataTransfer.files) it will show the dropped file(s).
//CODE
<!DOCTYPE html>
<html>
<head>
<script>
document.addEventListener("DOMContentLoaded", init);
function init(){
var dropbox = document.getElementById('dropbox');
dropbox.addEventListener('dragover', drag.over);
dropbox.addEventListener('drop', drag.drop);
}
var drag = {
"over": function(e){
e.preventDefault();
},
"drop": function(e){
e.preventDefault();
console.log(e); //NO FILES SHOWN
console.log(e.dataTransfer.files); //FILES in FileList Object
}
};
</script>
<style>
body{
margin: 0 !important;
height: 100vh;
width: 100vw;
display: flex;
justify-content: center;
}
#dropbox{
height: 400px;
width: 400px;
align-self: center;
background-color: #0089C4;
border-radius: .3em;
border: 1px dashed black;
-webkit-box-shadow: 0px 2px 7px rgba(0, 0, 0, 0.40);
box-shadow: 0px 2px 7px rgba(0, 0, 0, 0.40);
}
</style>
</head>
<body>
<div id="dropbox"></div>
</body>
</html>
687
someone or something that is unpleasant and boring: Waiting in a doctor's office is such a drag!
A force acting on a moving body, opposite in direction to the movement of the body, caused by the interaction of the body and the medium it moves through. The strength of drag usually depends on the velocity of the body.
Drag is where individuals dress up as a different gender, primarily for short periods of time, which differentiates the practice from people who are trans and change their gender socially and/or legally.
The drag data store has different modes depending on when you access it:
dragstart event it's on read/write mode. drop event, it's in read only mode.And on all other events, it's in protected mode.
Protected mode is defined this way:
Protected mode
For all other events. The formats and kinds in the drag data store list of items representing dragged data can be enumerated, but the data itself is unavailable and no new data can be added.
See here: https://html.spec.whatwg.org/multipage/interaction.html#the-drag-data-store
That means that when you access the dataTransfer object in your console, which is not on drop or dragstart event, it's in protected mode, preventing you from accessing the data.
You can view the fileList because you log the fileList on drop event when dataTransfer is readable. But if you log e.dataTransfer or e, you won't be able to access any data.
You can test here, even on dragover you can't access what's in dataTransfer:
document.querySelector('#droppable').ondragover = function(e) {
console.log('on dragover files are', e.dataTransfer.files)
e.preventDefault();
}
document.querySelector('#droppable').ondrop = function(e) {
console.log('on drop files are', e.dataTransfer.files)
e.preventDefault();
}<div id=droppable>Drop a file</div>If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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