Photo upload with preview working 100%

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Css 
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fieldset {
    border:0;
    margin-bottom:20px;
}

input {
    display:block;
}

img.preview {
    width:200px;
    height:auto;
    clear:both;
    margin:10px 0;
}

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Js
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/**
 * Created by talha on 5/6/2016.
 */
var loadFile = function(event) {
    oldimg = $('.preview').attr('src');
    var preview = document.getElementById('preview');
    preview.src = URL.createObjectURL(event.target.files[0]);
    newimg = preview.src;
    if(newimg.indexOf('/null') > -1) {
        preview.src = oldimg;
    }
};

//Dummy button :p for checking
$('.submit-button').on('click', function(event) {
    alert('This is a dummy submit button. It does nothing.');
    event.preventDefault();
});

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Html /View File
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<div class="photo-upload">
    {!! Form::open(array('route' => 'photo.store', 'method' => 'put', 'files' => true)) !!}
    <fieldset>
        <label>UPLOAD PICTURE:</label>
        <br/>
        <img class="preview" id="preview" alt=" " src="{!!asset(Auth::user()->profile->img_url)!!}">
        <br/>
        <br/>
        <input type="file" name="image" id="imgInp" onchange="loadFile(event);">
    </fieldset>
    
    <fieldset>
        {!! Form::submit('Update Avatar', array('class' => 'btn btn-primary')) !!}
    </fieldset>
    
    {!! Form::close() !!}
</div>