javascript - Drop images from browser using dropzone.js -

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i making web chat application has feature drag-drop file , upload server (i have make whatsapp web has feature). i'm using dropzone.js achieve , has been working great far except 1 thing. event 'sending' never called when dropping image browser. here's example

new dropzone('.drag-overlay', {    url: "www.example.com",   paramname: "attachment",   init: function() {     this.on("drop", function(e){       console.log("drop event");     });     this.on("sending", function(file){       console.log("sending event");       });   } });

the drop event called fine sending never called. can give me direction how can send file browser using library?

thanks

sending event call . upload document . change call dropzone method .

var mydropzone = new dropzone

live demo here . see console in web

see below example

// dropzone class:  var mydropzone = new dropzone(".drag-overlay", {     url: "www.example.com",    paramname: "attachment",    init: function() {     this.on("drop", function(e){     alert('drop event');     console.log("drop event");     });    this.on("sending", function(file){    alert('sending event');    console.log("sending event");        });  /*this code remove tooltip error*/  this.on('error', function(file, errormessage) {    var mypreview = document.getelementsbyclassname('dz-error');    mypreview = mypreview[mypreview.length - 1];    mypreview.classlist.toggle('dz-error');    mypreview.classlist.toggle('dz-success');  });    }        });
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>  <link href="https://cdnjs.cloudflare.com/ajax/libs/dropzone/4.3.0/dropzone.css" rel="stylesheet"/>  <link href="https://cdnjs.cloudflare.com/ajax/libs/dropzone/4.3.0/basic.css" rel="stylesheet"/>  <script src="https://cdnjs.cloudflare.com/ajax/libs/dropzone/4.3.0/dropzone.js"></script>  <div class="clsbox-1" runat="server"  >  		<div class="dropzone drag-overlay" id="drag-overlay">    		</div>  	</div>


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