Java Script function not working correctly to replace the name of the selected file on the label tag

Question

I am trying to use a code to change the style of the file type buttons in html using CSS and JS. Somehow the JS function is not working properly and it is not replacing the name of the selected file on the label. Here are the codes in the jsfiddle: See the codes in jsfiddle

Any help is appreciated!

html:

<input type="file" name="file" id="file" class="inputfile" data-multiple-caption="{count} files selected" multiple />
<label for="file"><strong>Choose a file</strong></label>

css:

.inputfile {
    width: 0.1px;
    height: 0.1px;
    opacity: 0;
    overflow: hidden;
    position: absolute;
    z-index: -1;
}

.inputfile + label {
    font-size: 1.25em;
    font-weight: 700;
    color: white;
    background-color: black;
    display: inline-block;
}

.inputfile:focus + label,
.inputfile + label:hover {
    background-color: red;
}

.inputfile + label {
    cursor: pointer; /* "hand" cursor */
}

js:

var inputs = document.querySelectorAll( '.inputfile' );
Array.prototype.forEach.call( inputs, function( input )
{
    var label    = input.nextElementSibling,
        labelVal = label.innerHTML;

    input.addEventListener( 'change', function( e )
    {
        var fileName = '';
        if( this.files && this.files.length > 1 )
            fileName = ( this.getAttribute( 'data-multiple-caption' ) || '' ).replace( '{count}', this.files.length );
        else
            fileName = e.target.value.split( '\\' ).pop();

        if( fileName )
            label.querySelector( 'span' ).innerHTML = fileName;
        else
            label.innerHTML = labelVal;
    });
});

Answer 1

There is no span tag inside your label

Change this

label.querySelector( 'span' ).innerHTML = fileName;

To this

label.querySelector( 'strong' ).innerHTML = fileName;