谷歌地图和淘汰赛 [英] Google maps and knockoutjs

问题描述

我正在制作一个单页应用程序，我需要在第二个视图中显示 Google 地图.我正在使用要创建地图对象的 Google 地图 API.

 var map = new google.maps.Map(mapId, {变焦:5，中心:新的 google.maps.LatLng(55, 11)，mapTypeId: google.maps.MapTypeId.ROADMAP});

参数 mapId 给我带来了问题.该视图包含一个 ID 为mapId"的 div，但我无法获取该 ID，因此无法显示地图.我尝试过 HTML 绑定、属性绑定，但它不起作用.我是淘汰赛的新手.请提出一些方法

解决方案

你应该像这样使用自定义绑定:

ko.bindingHandlers.map = {初始化:函数(元素，valueAccessor，allBindingsAccessor，viewModel){var mapObj = ko.utils.unwrapObservable(valueAccessor());var latLng = 新的 google.maps.LatLng(ko.utils.unwrapObservable(mapObj.lat),ko.utils.unwrapObservable(mapObj.lng));var mapOptions = { 中心:latLng，变焦:5，mapTypeId: google.maps.MapTypeId.ROADMAP};mapObj.googleMap = new google.maps.Map(element, mapOptions);}};

您的 HTML 将如下所示:

最后你的视图模型:

function MyViewModel() {var self = this;self.myMap = ko.observable({纬度:ko.observable(55),lng: ko.observable(11)});}

这是一个fiddle，它的作用比你的要多一些正在询问，但也适用于您的情况.

I am making a single page app where in the second view I need to display the Google map. I am using the Google maps API where the map object is to be created.

 var map = new google.maps.Map(mapId, {
        zoom: 5,
        center: new google.maps.LatLng(55, 11),
        mapTypeId: google.maps.MapTypeId.ROADMAP
 });

The parameter mapId is giving me a problem. The view contains a div with id say "mapId", but I am not able to get the id and so the map cannot be displayed. I tried HTML binding, attribute binding but it does not work. I am new to knockout. Please suggest some method

解决方案

You should use a custom binding like so:

ko.bindingHandlers.map = {

    init: function (element, valueAccessor, allBindingsAccessor, viewModel) {
        var mapObj = ko.utils.unwrapObservable(valueAccessor());
        var latLng = new google.maps.LatLng(
            ko.utils.unwrapObservable(mapObj.lat),
            ko.utils.unwrapObservable(mapObj.lng));
        var mapOptions = { center: latLng,
                          zoom: 5, 
                          mapTypeId: google.maps.MapTypeId.ROADMAP};

        mapObj.googleMap = new google.maps.Map(element, mapOptions);
    }
};

Your HTML would look like this:

<div id="mapDiv" data-bind="style:{width:'300px',height:'300px'},map:myMap"></div>

Finally your view model:

function MyViewModel() {
    var self = this;
    self.myMap = ko.observable({
        lat: ko.observable(55),
        lng: ko.observable(11)});
}

Here is a fiddle that does a bit more than what you are asking but should work fine for your case as well.

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