如何使用带有greasemonkey的google maps api来读取地址表并跟踪路线？

Question

有一个网站在表格中保存了我所在城市（Porto Alegre - 巴西）的巴士路线。

例如：EPTC

使用Greasemonkey加载Google Maps API，想在屏幕右上角显示固定地图。

脚本必须从表格中读取街道名称，去除多余的空格（有很多），并以正确的顺序绘制路线。

Answer 1

这是完成任务的 Greasemonkey 兼容脚本：http://userscripts.org/scripts/show/116339

要点：

1- 找到表格并遍历每个单元格以获取内容
2-去除所有多余的空格并将文本保存在数组中
3-创建两个DIV，一个在另一个里面（否则位置不会固定）
4- 将 DIV 附加到页面并调用 API
5- 必须使用 unsafeWindow (google = unsafeWindow.google) 调用“google”

API_js_callback = "http://maps.google.com/maps/api/js?sensor=false&region=BR&callback=initialize";

var script = document.createElement('script');
    script.src = API_js_callback;
    var head = document.getElementsByTagName("head")[0];
    (head || document.body).appendChild(script);

if (document.getElementsByTagName('TABLE')[0] != null) {
    var Tabela_1 = document.getElementsByTagName('TABLE')[0];
    var Tabela_1_cel = Tabela_1.getElementsByTagName('TD');
    var Tabela_1_lin = Tabela_1.getElementsByTagName('TR');
}

if (document.getElementsByTagName('TABLE')[1] != null) {
    var Tabela_2 = document.getElementsByTagName('TABLE')[1];
    var Tabela_2_cel = Tabela_2.getElementsByTagName('TD');
    var Tabela_2_lin = Tabela_2.getElementsByTagName('TR');
}

var DIVmapa = document.createElement('div');
    DIVmapa.id = 'DIVmapa';
    DIVmapa.style.border = '2px coral solid';
    DIVmapa.style.cursor = 'pointer';
    DIVmapa.style.display = '';
    DIVmapa.style.height = '75%';
    DIVmapa.style.margin = '1';
    DIVmapa.style.position = 'fixed';
    DIVmapa.style.padding = '1';
    DIVmapa.style.right = '1%';
    DIVmapa.style.top = '1%';
    DIVmapa.style.width = '30%';
    DIVmapa.style.zIndex = '99';

var DIVinterna = document.createElement('div');
    DIVinterna.id = 'DIVinterna';
    DIVinterna.style.height = '100%';
    DIVinterna.style.width = '100%';
    DIVinterna.style.zIndex = '999';

if (Tabela_1 || Tabela_2) {
    document.body.appendChild(DIVmapa);
    DIVmapa.appendChild(DIVinterna);
}

initialize = setTimeout(function () {
    google = unsafeWindow.google;
    directionsService = new google.maps.DirectionsService();
    directionsDisplay = new google.maps.DirectionsRenderer();

    var PortoAlegre = new google.maps.LatLng(-30.034176,-51.229212);
    var myOptions = {
        zoom: 14,
        mapTypeId: google.maps.MapTypeId.ROADMAP,
        center: PortoAlegre
    }

    map = new google.maps.Map(document.getElementById("DIVinterna"), myOptions);
    directionsDisplay.setMap(map);

    function calcRoute() {
        var start = Tabela_1_cel[1].getElementsByTagName('B')[0].innerHTML.replace(/\s{2,}/g, ' ') + ' Porto Alegre';
        var end = Tabela_1_cel[10].getElementsByTagName('B')[0].innerHTML.replace(/\s{2,}/g, ' ') + ' Porto Alegre';
        var waypts = [];
        //for (var i=1; i<Tabela_1_cel.length; i++) {
        for (var i=2; i<10; i++) {
            ponto_1 = Tabela_1_cel[i].getElementsByTagName('B')[0].innerHTML;
            semespacos_1 = ponto_1.replace(/\s{2,}/g, ' ') + ' Porto Alegre'; 
            waypts.push({location: semespacos_1, stopover: true});
        }

        var request = {
            origin: start, 
            destination: end,
            waypoints: waypts,
            optimizeWaypoints: false,
            travelMode: google.maps.DirectionsTravelMode.DRIVING
        };

        directionsService.route(request, function(response, status) {
            if (status == google.maps.DirectionsStatus.OK) {directionsDisplay.setDirections(response)};
            //alert(status);
        });
    }

    calcRoute();
}, 1000);

享受吧！ :)