ACM Portal のキーバインド for OPERA

General

ACM Portal をよく使うので練習がてらOPERA の user.js を書く．

要 shortcut.js と最近流行のJavaScript-XPath．

j: 次の論文へ
k: 前の論文へ
n: 次の20件
p: 前の20件
Enter: 現在選択している論文の詳細を開く
という感じにしたい．

なんだかまだ不安定．
parentの6連続はいかがなものか..．
JavaScript よく分からん．



//

// ==UserScript==

// @name           shortcut for ACM portal

// @description    shortcut for ACM portal

// @include        http://portal.acm.org/results.cfm*

// ==/UserScript==
(function(){

    var focus = null;

    var links = null;

    shortcut.add("j", next);

    shortcut.add("k", previous);

    shortcut.add("n", next_page);

    shortcut.add("p", previous_page);

    shortcut.add("Enter", open);



    function next() {

        if (links == null) {

            links = document.evaluate("//td/a[@class='medium-text']", document, null, 7, null);

        }

        if (focus == null) {

            focus = 0;

        } else if (focus >= links.snapshotLength - 1) {

            // do nothing

        } else {

            window.scrollBy(0, links.snapshotItem(focus).parentNode.parentNode.parentNode.parentNode.parentNode.parentNode.offsetHeight + 10);
            links.snapshotItem(focus).parentNode.removeAttribute("bgcolor");

            focus = focus + 1;

        }

        var link = links.snapshotItem(focus);

        link.parentNode.setAttribute("bgcolor","#B0E0E6");

    }
    function previous() {

        if (links == null) {

            links = document.evaluate("//td/a[@class='medium-text']", document, null, 7, null);

        }

        if (focus == null) {

            focus = 0;

        } else if (focus <= 0) {

            // do nothing

        } else {

            window.scrollBy(0, -links.snapshotItem(focus).parentNode.parentNode.parentNode.parentNode.parentNode.parentNode.offsetHeight - 10);

            links.snapshotItem(focus).parentNode.removeAttribute("bgcolor");

            focus = focus - 1;

        }

        var link = links.snapshotItem(focus);

        link.parentNode.setAttribute("bgcolor","#B0E0E6");

    }
    function next_page() {

        links = document.evaluate("//a[normalize-space(text()) = 'next']", document, null, 7, null);

        window.location = links.snapshotItem(0);

    }
    function previous_page() {

        links = document.evaluate("//a[normalize-space(text()) = 'previous']", document, null, 7, null);

        window.location = links.snapshotItem(0);

    }
    function open() {

        if (focus != null) {

            window.open(links.snapshotItem(focus));

        }

    }
})();