hideopen.php

<?php
protected static function hide_show($button, $code, $h='Hide', $s='Show') {
        $js_trigger = new Js\Callback(function($e) use($code, $h, $s) {
            $value = $e->get('target')->get('value');
            $text  = Js\Variable::createFresh(Js\string($h));
            $disp  = Js\Variable::createFresh(Js\string('flex'));
            return $text->onTop() . $disp->onTop() . new Js\IfElse(
                $value->equals(Js\string($h)),
                function() use ($text, $disp, $h, $s) {
                    return $disp->set(Js\string('none')) .';'
                         . $text->set(Js\string($s)) .';';
                },
                function(){}
            ) . $value->set($text) . ';'
                 . $code->js()->v()
                        ->get('style')
                        ->get('display')
                        ->set($disp);
        });
        $js_var = Js\Variable::createFresh($js_trigger);
        
        client(
            $js_var, 
            $button->js()->addEventListener(
                Js\CLICK,
                $js_var,
                Js\_FALSE_
            )
        );
    }