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add IMDb rating & votes next to all IMDb Movie/Series Links (improved)

Adds movie ratings and number of voters to any imdb link. Modified version of http://userscripts.org/scripts/show/96884

当前为 2014-06-03 提交的版本，查看 最新版本。

// ==UserScript==
// @name         add IMDb rating & votes next to all IMDb Movie/Series Links (improved)
// @description  Adds movie ratings and number of voters to any imdb link. Modified version of http://userscripts.org/scripts/show/96884
// @author         StackOverflow community (especially Brock Adams)
// @version        2014-06-03
// @match        *://www.imdb.com/*
// @grant        GM_xmlhttpRequest
// @namespace https://greatest.deepsurf.us/users/2427
// ==/UserScript==
// Special Thanks to Brock Adams for this script: http://stackoverflow.com/questions/23974801/gm-xmlhttprequest-data-is-being-placed-in-the-wrong-places/23992742

var maxLinksAtATime     = 50; //-- pages can have 100's of links to fetch. Don't spam server or browser.
var fetchedLinkCnt      = 0;

function processIMDB_Links () {
    //--- Get only links that could be to IMBD movie/TV pages.
    var linksToIMBD_Shows   = document.querySelectorAll ("a[href*='/title/']");

    for (var J = 0, L = linksToIMBD_Shows.length;  J < L;  J++) {
        var currentLink = linksToIMBD_Shows[J];

        /*--- Strict tests for the correct IMDB link to keep from spamming the page
            with erroneous results.
        */
        if (    ! /^(?:www\.)?IMDB\.com$/i.test (currentLink.hostname)
            ||  ! /^\/title\/tt\d+\/?$/i.test (currentLink.pathname)
        )
            continue;

        if (! currentLink.getAttribute ("data-gm-fetched") ){
            if (fetchedLinkCnt >= maxLinksAtATime){
                //--- Position the "continue" button.
                continueBttn.style.display = 'inline';
                currentLink.parentNode.insertBefore (continueBttn, currentLink);
                break;
            }

            fetchTargetLink (currentLink); //-- AJAX-in the ratings for a given link.

            //---Mark the link with a data attribute, so we know it's been fetched.
            currentLink.setAttribute ("data-gm-fetched", "true");
            fetchedLinkCnt++;
        }
    }
}

function fetchTargetLink (linkNode) {
    //--- This function provides a closure so that the callbacks can work correctly.

    /*--- Must either call AJAX in a closure or pass a context.
        But Tampermonkey does not implement context correctly!
        (Tries to JSON serialize a DOM node.)
    */
    GM_xmlhttpRequest ( {
        method:     'get',
        url:        linkNode.href,
        //context:    linkNode,
        onload:     function (response) {
            prependIMDB_Rating (response, linkNode);
        },
        onload:     function (response) {
            prependIMDB_Rating (response, linkNode);
        },
        onabort:     function (response) {
            prependIMDB_Rating (response, linkNode);
        }
    } );
}

function prependIMDB_Rating (resp, targetLink) {
    var isError     = true;
    var ratingTxt   = "** Unknown Error!";

    if (resp.status != 200  &&  resp.status != 304) {
        ratingTxt   = '** ' + resp.status + ' Error!';
    }
    else {
        if (/\(awaiting \d+ votes\)|\(voting begins after release\)|in development/i.test (resp.responseText) ) {
            ratingTxt   = "NR";
            isError     = false;
        }
        else {
            var ratingM = resp.responseText.match (/Users rated this (.*) \(/);
            var votesM  = resp.responseText.match (/\((.*) votes\) -/);

            if (ratingM  &&  ratingM.length > 1  &&  votesM  &&  votesM.length > 1) {
                isError     = false;
                ratingTxt   = ratingM[1] + " - " + votesM[1];
            }
        }
    }

    var resltSpan       = document.createElement ("span");
    resltSpan.innerHTML = '<b> [' + ratingTxt + '] </b>&nbsp;';

    if (isError)
        resltSpan.style.color = 'red';

    //var targetLink      = resp.context;
    //console.log ("targetLink: ", targetLink);

    targetLink.parentNode.insertBefore (resltSpan, targetLink);
}

//--- Create the continue button
var continueBttn        = document.createElement ("button");
continueBttn.innerHTML  = "Get ratings";

continueBttn.addEventListener ("click", function (){
        fetchedLinkCnt              = 0;
        continueBttn.style.display  = 'none';
        processIMDB_Links ();
    },
    false
);

processIMDB_Links ();