wrolpi/app/public/epub/epub.html

<!DOCTYPE html>
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2. Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1"/>
    <script src="/epub/jszip.min.js"></script>
    <script src="/epub/epub.js"></script>
</head>
<body>

<style>
    body {
        margin: 0;
        background: #fafafa;
        font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
        color: #333;

        position: absolute;
        height: 100%;
        width: 100%;
    }

    #title {
        width: 900px;
        min-height: 18px;
        margin: 10px auto;
        text-align: center;
        font-size: 16px;
        color: #E2E2E2;
        font-weight: 400;
    }

    #title:hover {
        color: #777;
    }

    #viewer {
        width: 80%;
        height: 90%;
        box-shadow: 0 0 4px #ccc;
        padding: 10px 10px 0px 10px;
        margin: 5px auto;
        background: white;
    }

    #prev {
        left: 0;
    }

    #next {
        right: 0;
    }

    #toc {
        display: block;
        margin: 10px auto;
    }

    .arrow {
        position: fixed;
        top: 50%;
        margin-top: -32px;
        font-size: 64px;
        color: #E2E2E2;
        font-family: arial, sans-serif;
        font-weight: bold;
        cursor: pointer;
        -webkit-user-select: none;
        -moz-user-select: none;
        user-select: none;
        text-decoration: none;
    }

    .arrow:hover {
        color: #777;
    }

    .arrow:active {
        color: #000;
    }

    #book-viewer iframe {
        padding: 40px 40px;
    }

    #controls > input[type=range] {
        width: 400px;
    }

    #navigation h1 {
        width: 200px;
        font-size: 16px;
        font-weight: normal;
        color: #fff;
        margin-bottom: 10px;
    }

    #navigation h2 {
        font-size: 14px;
        font-weight: normal;
        color: #B0B0B0;
        margin-bottom: 20px;
    }

    #navigation ul {
        padding-left: 36px;
        margin-left: 0;
        margin-top: 12px;
        margin-bottom: 12px;
        width: 340px;
    }

    #navigation ul li {
        list-style: decimal;
        margin-bottom: 10px;
        color: #cccddd;
        font-size: 12px;
        padding-left: 0;
        margin-left: 0;
    }

    #navigation ul li a {
        color: #ccc;
        text-decoration: none;
    }

    #navigation ul li a:hover {
        color: #fff;
        text-decoration: underline;
    }

    #navigation ul li {
        color: #fff;
    }

    svg {
        display: block;
    }

</style>

<select id="toc"></select>
<div id="viewer"></div>
<a id="prev" href="#prev" class="arrow">‹</a>
<a id="next" href="#next" class="arrow">›</a>

<script>
    let params = URLSearchParams && new URLSearchParams(document.location.search.substring(1));
    let url = params && params.get("url") && decodeURIComponent(params.get("url"));
    let currentSectionIndex = (params && params.get("loc")) ? params.get("loc") : undefined;

    let book = ePub(url);
    let rendition = book.renderTo("viewer", {
        flow: "paginated",
        width: "100%",
        height: "100%"
    });

    rendition.display(currentSectionIndex);

    book.ready.then(() => {

        let next = document.getElementById("next");

        next.addEventListener("click", function (e) {
            book.package.metadata.direction === "rtl" ? rendition.prev() : rendition.next();
            e.preventDefault();
        }, false);

        let prev = document.getElementById("prev");
        prev.addEventListener("click", function (e) {
            book.package.metadata.direction === "rtl" ? rendition.next() : rendition.prev();
            e.preventDefault();
        }, false);

        let keyListener = function (e) {

            // Left Key
            if ((e.keyCode || e.which) === 37) {
                book.package.metadata.direction === "rtl" ? rendition.next() : rendition.prev();
            }

            // Right Key
            if ((e.keyCode || e.which) === 39) {
                book.package.metadata.direction === "rtl" ? rendition.prev() : rendition.next();
            }

        };

        rendition.on("keyup", keyListener);
        document.addEventListener("keyup", keyListener, false);

    })

    let title = document.getElementById("title");

    rendition.on("rendered", function (section) {
        let current = book.navigation && book.navigation.get(section.href);

        if (current) {
            let $select = document.getElementById("toc");
            let $selected = $select.querySelector("option[selected]");
            if ($selected) {
                $selected.removeAttribute("selected");
            }

            let $options = $select.querySelectorAll("option");
            for (let i = 0; i < $options.length; ++i) {
                let selected = $options[i].getAttribute("ref") === current.href;
                if (selected) {
                    $options[i].setAttribute("selected", "");
                }
            }
        }

    });

    rendition.on("relocated", function (location) {
        console.log(location);

        let next = book.package.metadata.direction === "rtl" ? document.getElementById("prev") : document.getElementById("next");
        let prev = book.package.metadata.direction === "rtl" ? document.getElementById("next") : document.getElementById("prev");

        if (location.atEnd) {
            next.style.visibility = "hidden";
        } else {
            next.style.visibility = "visible";
        }

        if (location.atStart) {
            prev.style.visibility = "hidden";
        } else {
            prev.style.visibility = "visible";
        }

    });

    rendition.on("layout", function (layout) {
        let viewer = document.getElementById("viewer");

        if (layout.spread) {
            viewer.classList.remove('single');
        } else {
            viewer.classList.add('single');
        }
    });

    window.addEventListener("unload", function () {
        console.log("unloading");
        this.book.destroy();
    });

    book.loaded.navigation.then(function (toc) {
        let $select = document.getElementById("toc"),
            docfrag = document.createDocumentFragment();

        toc.forEach(function (chapter) {
            let option = document.createElement("option");
            option.textContent = chapter.label;
            option.setAttribute("ref", chapter.href);

            docfrag.appendChild(option);
        });

        $select.appendChild(docfrag);

        $select.onchange = function () {
            let index = $select.selectedIndex,
                url = $select.options[index].getAttribute("ref");
            rendition.display(url);
            return false;
        };

    });

</script>

</body>

</html>