ReactJS组件将数据传递回父组件不起作用

时间:2016-04-06 10:26:32

标签: javascript google-maps-api-3 reactjs

我正在开发一个ReactJS组件,该组件使用Google Maps Javascript API呈现Google地图。在地图上,我动态放置显示不同分销商位置的标记。现在,模拟数据来自具有不同信息的分发器阵列,并且正在循环迭代。单击标记时,我会让InfoWindow显示分发者详细信息。现在在这个InfoWindow中我有一个按钮,允许客户选择这个分销商。

GoogleMap组件归ChooseDistributor组件所有。当单击该按钮时,我想要一个ID(现在是一个带有分发者名称的字符串)通过回调函数发送回ChooseDistributor组件。

问题是当我点击按钮时我得到Uncaught TypeError: Cannot read property 'callbackParent' of undefined。这可能是一个范围问题,因为当我在循环中时,this并不是指GoogleMap组件本身(?)。

然后我尝试在循环之外创建一个变量callbackParent,其中包含this.props.callbackParent,它应链接回ChooseDistributor组件中的接收函数。然后我在按钮onclick上调用此变量。这不起作用,因为我得到Uncaught ReferenceError: callbackParent is not defined

如果有人能解决这个问题,我将不胜感激。我错过了什么或是一个简单的语法错误?提前谢谢。

以下是我的代码。

ChooseDistributor组件

var ChooseDistributor = React.createClass({
    getSelectedDistributor: function(company){
        alert(company);
    },

    render: function(){
        return(
            <div>
                <Header headerClass="title" title="Choose distributor"/>
                <div className="fillViewPort">
                    <GoogleMap enableIwSelectButton={true} callbackParent={this.getSelectedDistributor}/>
                </div>
                <NavBar />
            </div>

        );
    }
})
module.exports = ChooseDistributor;

GoogleMap组件:

var GoogleMap = React.createClass({
    getInitialState: function(){
        return {
            // LOCATIONS STATE SHOULD GET DATA FROM STORE
            locations: [
                // ARRAY VALUES: [0]=LAT, [1]=LNG, [2]=COMPANY, [3]=ADDRESS, [4]=CITY, [5]=WEBSITE, [6]=PHONE, [7]=EMAIL
                [55.628353, 12.388910, 'Distributor One', 'First street 11', '1111 Copenhagen', 'www.company.com', '+4512345678', 'distributor@company.dk'],
                [55.623321, 12.388438, 'Distributor Two', 'Second street 22', '2222 Copenhagen', 'www.company.com', '+4512345678', 'distributor@company.dk'],
                [55.670710, 12.389256, 'Distributor Three', 'Third street 33', '3333 Copenhagen', 'www.company.com', '+4512345678', 'distributor@company.dk'],
                [55.581179, 12.295583, 'Distributor Four', 'Fourth street 44', '4444 Copenhagen', 'www.company.com', '+4512345678', 'distributor@company.dk'],
                [55.647296, 12.284211, 'Distributor Five', 'Fifth street 55', '5555 Copenhagen', 'www.company.com', '+4512345678', 'distributor@company.dk']
            ]
        }
    },
    componentDidMount: function(){
        var locations = this.state.locations;
        var enableIwSelectButton = this.props.enableIwSelectButton;
        var callbackParent = this.props.callbackParent;
        var map = new google.maps.Map(document.getElementById('googleMap'), {
            zoom: 11,
            center: new google.maps.LatLng(locations[0][0], locations[0][1]), // CENTER PROPERTY SHOULD GET COORDINATES OF THE DEVICE CURRENT LOCATION IF PERMITTED.
            mapTypeControlOptions: {
              mapTypeIds: [google.maps.MapTypeId.ROADMAP]
            },
            mapTypeId: google.maps.MapTypeId.ROADMAP,
            disableDefaultUI: true
        });
        var infoWindow = new google.maps.InfoWindow();

        var marker, i;

        // PLACE MARKER ON MAP FOR EACH DISTRIBUTOR POSITION IN ARRAY.
        for (i = 0; i < locations.length; i++) {
            marker = new google.maps.Marker({
                position: new google.maps.LatLng(locations[i][0], locations[i][1]),
                map: map
            });
            // ADD INFOWINDOW WITH DISTRIBUTOR DETAILS TO EACH MARKER.
            google.maps.event.addListener(marker, 'click', (function(marker, i) {
                return function() {

                    infoWindow.setContent('<p class="iwTitle">' + locations[i][2] + '</p>'+
                        '<p class="iwText">' + locations[i][3] + '<br>' +
                        locations[i][4] + '<br>' +
                        '<a href="http://' + locations[i][5] + '">' + locations[i][5] + '</a></p>' +
                        '<p class="iwText"><i class="fa fa-phone iwIcons"></i>' + locations[i][6] + '<br>' +
                        '<i class="fa fa-envelope iwIcons"></i><a href="mailto:"' + locations[i][7] + '>'  + locations[i][7] + '</a></p>' +
                        (enableIwSelectButton ? '<button type="button" class="iwButton" onclick={this.props.callbackParent(locations[i][3])}><p>Select Distributor</p></button>' : ''));
                    infoWindow.open(map, marker);
                }
            })(marker, i));
        }
    },
    render: function(){
        return(
          <div id="googleMap" className="size-100-pct" />
        );
    }
})

module.exports = GoogleMap;

更新: 感谢@ Radio-我的问题解决了。解决方案是给每个按钮一个Id,然后通过该Id获取按钮,并像这样添加一个eventlistener:

google.maps.event.addListener(marker, 'click', (function(marker, i) {
                return function() {

                    infoWindow.setContent('<p class="iwTitle">' + locations[i][2] + '</p>'+
                        '<p class="iwText">' + locations[i][3] + '<br>' +
                        locations[i][4] + '<br>' +
                        '<a href="http://' + locations[i][5] + '">' + locations[i][5] + '</a></p>' +
                        '<p class="iwText"><i class="fa fa-phone iwIcons"></i>' + locations[i][6] + '<br>' +
                        '<i class="fa fa-envelope iwIcons"></i><a href="mailto:"' + locations[i][7] + '>'  + locations[i][7] + '</a></p>' +
                        (enableIwSelectButton ? '<button type="button" id="btnSelect' + i + '" class="iwButton"><p>Select Distributor</p></button>' : ''));
                    infoWindow.open(map, marker);
                    var el = document.getElementById("btnSelect" + i);
                    el.addEventListener("click", function(){callbackParent(locations[i][2])});
                }
            })(marker, i));

2 个答案:

答案 0 :(得分:0)

&#39; this&#39;内部callback方法指的是回调本身。因此,您无法访问this&#39;内部回调函数引用外部范围。

尝试ES6语法:

 myFn:()=>{
this.props.any();
}

,或者

var self = this.
myFn:function(){
  self.props.any();
}

答案 1 :(得分:0)

InfoWindow中的按钮不是React组件。它是原始html,可能由setContent解析。因此,按钮的'onclick'属性将尝试在全局命名空间中执行一个函数。它没有意识到它是如何创建的,callbackParentthis.props.callbackParentlocations[i][3]都不在全局命名空间中供它引用。

您可以在componentDidMount中使用常规DOM操作来添加事件侦听器。

infoWindow.setContent(... '<button type="button" class="iwButton"><p>Select Distributor</p></button>' : ''));
infoWindow.open(map, marker);

var el = document.getElementsByClassName("iwButton");
el.addEventListener("click", function() { callbackParent(locations[i][3]) });