Easy Keyboard Link Opener

Open links and click buttons easily using only the keyboard!
当前为 2021-03-22 提交的版本，查看最新版本。
换行
// ==UserScript==
// @name         Easy Keyboard Link Opener
// @description  Open links and click buttons easily using only the keyboard!
// @version      0.2.8
// @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 = "'"

    // Colors
    const textColor = "#fff"
    const backgroundColor = "#555"

    //

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

    function setListeners() {
        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]
                    chosen.click()
                }
                /*else if (event.key === "Tab") {

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

    function clearAction() {
        // let el
        for (let el of document.querySelectorAll('.displayText_container')) { el.remove() }
        for (let el of document.querySelectorAll('.displayText')) { el.remove() }
        visibleLinks = []
        isSet = false
    }

    function actionHot() {
        let links = Array.from(document.querySelectorAll('a,button')).filter(
            (el) => isInViewport(el) && !(el.offsetWidth === 0 || el.offsetHeight === 0) && !(el.nodeName === "A" && el.getAttribute('href') == null)
        )

        let numlinks = 0

        for (const el of links) {
            // create 1-9 tooltips then create tooltip 0 and break
            visibleLinks.push(el)
            if (numlinks >= 9) {
                createTooltip(el, 0)
                break;
            }
            numlinks += 1
            createTooltip(el, numlinks)
        }
        isSet = true
    }

    function createTooltip(el, num) {
        let oldDisplay = el.style.display
        el.style.display = "inline-block"
        const rect = getCoords(el);
        el.style.display = oldDisplay

        const tooltip = document.createElement("div")
        tooltip.setAttribute("class", "displayText")
        tooltip.innerText = num

        tooltip.style.left = rect.right + 'px'
        tooltip.style.top = rect.top + 'px'

        document.body.appendChild(tooltip)

        return tooltip
    }

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

        let styles = ".displayText { position: absolute; top: 0; right: -16px; margin: 0; overflow: visible !important; width: min-content; background-color: " + backgroundColor + "; color: " + textColor + "; text-align: center; border-radius: 2px; padding: 0px 2px; line-height: 20px; font-size: 14px; z-index: 9999; }"

        customStyles.innerHTML = styles;

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

    /*!
     * Determine if an element is in the viewport
     * (c) 2017 Chris Ferdinandi, MIT License, https://gomakethings.com
     * @param  {Node}    elem The element
     * @return {Boolean}      Returns true if element is in the viewport
     */
    var isInViewport = function (elem) {
        var distance = elem.getBoundingClientRect();
        return (
            distance.top >= 0 &&
            distance.left >= 0 &&
            distance.bottom <= (window.innerHeight || document.documentElement.clientHeight) &&
            distance.right <= (window.innerWidth || document.documentElement.clientWidth)
        );
    }

    function getCoords(elem) {
        let box = elem.getBoundingClientRect();

        return {
            top: box.top + window.pageYOffset,
            right: box.right + window.pageXOffset,
            bottom: box.bottom + window.pageYOffset,
            left: box.left + window.pageXOffset
        };
    }

    addCustomCSS()
    setListeners()

})();