snapdrop/app/elements/file-sharing/file-sharing-button-behavior.html

<script>
'use strict';
Chat.FileSharingButtonBehavior = {
    properties: {
        file: {
            type: String
        }
    },
    get fileInput(){
        var fileInput=document.querySelector('input');
    },
    attached: function() {
        this.$.file.onchange = function(value) {
            this.file = this.$.file.value;
            console.log(this.file);
            var files = this.$.file.files;
            for (var i = 0; i < files.length; i++) {
                var file = files[i];
                var reader = new FileReader();
                reader.onload = function(e2) {
                    // finished reading file data.
                    console.log('file dropped');
                    this.fire('file-uploaded', {
                        url: e2.target.result,
                        name: file.name
                    });
                }.bind(this);
                reader.readAsDataURL(file); // start reading the file data.
            }
        }.bind(this);
    },
    _upload: function() {
        this.$.file.click();
    }
};
</script>