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Thumbnail Navigator is thumbnail index of slides, it enables user navigate to specified slide, also indicates index of current slide.
Jssor Slider comes with 30+ professional themes, user can copy thumbnail navigator skin from any of 30+ themes (look for 'skin\thumbnail-*.source.html' in the download package).
Slider with Thumbnail Navigator (No-jQuery)
1. Javascript Code
<script src="jssor.slider.min.js"></script>
<script>
    jssor_slider1_starter = function (containerId) {
        var options = {
            $ThumbnailNavigatorOptions: {
                $Class: $JssorThumbnailNavigator$,
                $ChanceToShow: 2
            }
        };
        var jssor_slider1 = new $JssorSlider$(containerId, options);
    };
</script>
Reference: Thumbnail Navigator Options
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2. HTML code + trigger
<div id="slider1_container" style="position: relative; top: 0px; left: 0px; width: 600px; height: 300px;">
    <!-- Slides Container -->
    <div u="slides" style="cursor: move; position: absolute; overflow: hidden; left: 0px; top: 0px; width: 600px; height: 300px;">
        <div>
            <img u="image" src="image1.jpg" />
            <img u="thumb" src="thumb-image1.jpg" />
        </div>
        <div><img u="image" src="image2.jpg" /></div>
    </div>
    <!-- ThumbnailNavigator Skin Begin -->
        <!-- open 'skin\thumbnail-...source.html', copy and paste thumbnail navigator skin here -->
    <!-- ThumbnailNavigator Skin End -->
    <!-- Trigger -->
    <script>jssor_slider1_starter('slider1_container');</script>
</div>
Tip: adjust thumbnail navigator size and position
#1. Adjust thumbnail navigator position/size with css
<!-- Thumbnail Navigator Skin Begin -->
    ...
    <!-- thumbnail navigator container -->
    <div u="thumbnavigator" class="jssort01"
        style="width: 800px; height: 100px; left:0px; bottom: 0px;">
        <!-- Thumbnail Item Skin Begin -->
        <div u="slides" style="cursor: move;">
            <div u="prototype" class="p">
                <div class=w><div u="thumbnailtemplate" class="t"></div></div>
                <div class=c></div>
            </div>
        </div>
        <!-- Thumbnail Item Skin End -->
    </div>
<!-- Thumbnail Navigator Skin End -->
Reference: Thumbnail Navigator UI Definition

#2. In Addition, you can use option to auto center thumbnail items in thumbnail navigator container
<script>
jssor_slider1_starter = function (containerId) {
    var jssor_slider1 = new $JssorSlider$(containerId, {
        ...
        $ThumbnailNavigatorOptions: {
            ...
            //[Optional] Auto center thumbnail items in the
            //thumbnail navigator container
            //, 0 None, 1 Horizontal, 2 Vertical, 3 Both, default value is 3
            $AutoCenter: 1,
            ...
        }
    });
};
</script>
Reference: Thumbnail Navigator Options

See also Thumbnail Navigator with Slider Maker