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// widget_back.ysl2

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template "widget[@type='Back']", mode="widget_class"

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    class BackWidget extends Widget{

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        on_click(evt) {

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            if(jump_history.length > 1){

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               jump_history.pop();

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               let [page_name, index] = jump_history.pop();

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               switch_page(page_name, index);

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            }

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        }

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        init() {

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            this.element.setAttribute("onclick", "hmi_widgets['"+this.element_id+"'].on_click(evt)");

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        }

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    }

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    ||