Easy Keyboard Link Opener

Open links easily using only the keyboard
当前为 2021-03-21 提交的版本，查看最新版本。
换行
// ==UserScript==
// @name         Easy Keyboard Link Opener
// @description  Open links easily using only the keyboard
// @version      0.1.4
// @namespace    https://greasyfork.org/en/users/55535-sllypper
// @author       sllypper
// @match        *://*/*
// @grant        none
// @todo         add TAB to cycle between links
// ==/UserScript==

(function() {
    'use strict';

    // on the American keyboard layout, switch it to "`" instead
    // or whatever other key you want
    const HOTKEY = "'"

    // allow or deny links that start with #
    const ALLOW_ANCHOR_LINKS = true

    let isSet = false;
    let visibleLinks = [];
    let page;

    const tooltipColor = "#fff"
    const tooltipBgColor = "#555"

    function setHot() {
        document.addEventListener("keydown", event => {
            if (!isSet) {
                if (event.key === HOTKEY && event.ctrlKey) {
                    actionHot();
                }
            } else {
                if (event.key >= 0 && event.key < 10) {
                    let chosen
                    chosen = event.key === "0" ? visibleLinks[9] : visibleLinks[parseInt(event.key)-1]
                    window.location = chosen.getAttribute('href')
                    //console.log(chosen.getAttribute('href'))
                }
                /*else if (event.key === "Tab") {

                }*/
                //console.log(event.key)
                clearAction()
            }
        })
    }

    function clearAction() {
        let el
        while (el = document.querySelector('.displayText_container')) el.remove()
        visibleLinks = []
        isSet = false
    }

    function actionHot() {
        let links = Array.from(document.getElementsByTagName('a')).filter((el) => el.getAttribute('href') != null && !(el.offsetWidth === 0 || el.offsetHeight === 0) && isInViewport(el))

        if (!ALLOW_ANCHOR_LINKS) links = links.filter((el) => el.getAttribute('href')[0] != '#' )

        let numlinks = 0

        for (const el of links) {
            visibleLinks.push(el)

            if (numlinks >= 9) {
                showTooltip(el, 0)
                break;
            }
            numlinks += 1
            showTooltip(el, numlinks)
        }
        isSet = true
    }

    function showTooltip(el, num) {
        const superEl = document.createElement("span")
        superEl.setAttribute('style','position: relative;')
        superEl.setAttribute("class", "displayText_container")

        let tooltip = document.createElement("span")
        tooltip.setAttribute("class", "displayText")
        tooltip.innerText = num
        superEl.appendChild(tooltip)
        el.appendChild(superEl)
    }

    function addCustomCSS() {
        let customStyles = document.createElement("style");
        customStyles.setAttribute("type", "text/css");

        let styles = ".displayText { position: absolute; bottom: 100%; left: 100%; margin-left: 0; width: initial; background-color: "+tooltipBgColor+"; color: "+tooltipColor+"; text-align: center; border-radius: 2px; padding: 0px 2px; margin-bottom: -20px; line-height: 20px; font-size: 14px; z-index: 9999; }"
        customStyles.innerHTML = styles;

        document.getElementsByTagName("head")[0].appendChild(customStyles);
    }

    function isInViewport(element) {
        const rect = element.getBoundingClientRect();
        return (
            rect.top >= 0 &&
            rect.left >= 0 &&
            rect.bottom <= (window.innerHeight || document.documentElement.clientHeight) &&
            rect.right <= (window.innerWidth || document.documentElement.clientWidth)
        );
    }

    addCustomCSS()
    setHot()

})();