wrolpi/app/public/epub.html

<!DOCTYPE html>
<!--Copyright (c) 2013, FuturePress

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   list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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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="/jszip.min.js"></script>
    <script src="/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>