gpt4 book ai didi

javascript - ContextMenu.js 标签显示所有菜单项的最后一个条目的标签

转载 作者:行者123 更新时间:2023-11-30 16:37:55 24 4
gpt4 key购买 nike

我正在将 ContextMenu 用于其预期目的以外的其他用途,但这个想法似乎不错,即在 google map 上用点之间的距离标记多段线。

我希望每次将鼠标悬停在显示该腿的距离的多段线上时显示标签。我确定距离没有问题,但是,标签总是显示最后一个条目的距离,而不是为那条腿确定的距离。

我正在创建一组多段线,以便每条多段线都可以显示点之间的距离,除了距离标签外,一切似乎都很好。

这是我想要实现的目标的简化版本。

var flightPath = [];
var distanceLables = [];
var map;

function initMap() {
//Google Map
map = new google.maps.Map(document.getElementById('map'), {
zoom: 3,
center: {
lat: 0,
lng: -180
},
mapTypeId: google.maps.MapTypeId.TERRAIN
});

//waypoints for the Polyline
var flightPlanCoordinates = [{
lat: 37.772,
lng: -122.214
}, {
lat: 21.291,
lng: -157.821
}, {
lat: -18.142,
lng: 178.431
}, {
lat: -27.467,
lng: 153.027
}];

//drawing each leg of the PolyLine indiviually so that mouseover/mouseout events can be customised to each leg
for (i = 0; i < flightPlanCoordinates.length - 1; i++) {
var tempCoords = [];
tempCoords.push(flightPlanCoordinates[i]);
tempCoords.push(flightPlanCoordinates[i + 1]);
flightPath.push(new google.maps.Polyline({
path: tempCoords,
geodesic: true,
strokeColor: '#FF0000',
strokeOpacity: 1.0,
strokeWeight: 2,
map: map
}));

//Creating the Context Menu which is just one line with the leg number
var contextMenuOptions = {};
contextMenuOptions.classNames = {
menu: 'context_menu displance_display',
menuSeparator: 'context_menu_separator'
};
var menuItems = [];
menuItems.push({
className: 'context_menu_item',
eventName: 'distance_click',
id: 'distanceItem',
label: 'Leg #' + i
}); //Label should represent the leg
contextMenuOptions.menuItems = menuItems;
var pos = distanceLables.push(new ContextMenu(map, contextMenuOptions)) - 1;

//mouseover/mouseout events to show and hide the label
google.maps.event.addListener(flightPath[i], 'mouseover', function(mouseEvent) {
distanceLables[pos].show(mouseEvent.latLng);
});
google.maps.event.addListener(flightPath[i], 'mouseout', function(mouseEvent) {
distanceLables[pos].hide();
});
}
}
    html,

body {

height: 100%;

margin: 0;

padding: 0;

}

#map {

height: 100%;

}

.context_menu {

background-color: #ffff90;

border: 1px solid gray;

}

.context_menu_item {

padding: 3px 6px;

background-color: #ffff90;

}

.context_menu_item:hover {

background-color: #4b545f;

color: #fff;

}

.context_menu_separator {

background-color: gray;

height: 1px;

margin: 0;

padding: 0;

}
<!DOCTYPE html>
<html>

<head>
<title>Problem</title>
<script src="http://code.jquery.com/jquery-latest.min.js"></script>
<script type='text/javascript' src='http://maps.googleapis.com/maps/api/js?ver=4.2.2'></script>
<script src="http://code.martinpearman.co.uk/googlemapsapi/contextmenu/1.0/src/ContextMenu.js"></script>
</head>

<body onload="initMap()">
<div id="map"></div>
</body>

</html>

谢谢,

斯图

最佳答案

问题是您要定义要在循环内的鼠标事件上显示的标签。现在它看起来有点像这样:

for (i = 0; i < flightPlanCoordinates.length - 1; i++) {
var pos = distanceLables.push(new ContextMenu(map, contextMenuOptions)) - 1;

google.maps.event.addListener(flightPath[i], 'mouseover', function(mouseEvent) {
distanceLables[pos].show(mouseEvent.latLng);
});
}

在鼠标悬停事件发生之前,匿名函数中的行不会被执行。所以你真正要做的是:

var pos = 0;
google.maps.event.addListener(flightPath[i], 'mouseover', function(mouseEvent) {...});

var pos = 1;
google.maps.event.addListener(flightPath[i], 'mouseover', function(mouseEvent) {...});

var pos = 2;
google.maps.event.addListener(flightPath[i], 'mouseover', function(mouseEvent) {...});
... etc

在循环结束时,pos = 数组的长度 - 1,因此当您将鼠标悬停在任何飞行路径部分上时,此行始终执行:

    distanceLables[pos].show(mouseEvent.latLng);

即它总是会是:

    distanceLables[3].show(mouseEvent.latLng);

另一种方法可能是这样的:

for (i = 0; i < flightPlanCoordinates.length - 1; i++) {
var pos = distanceLables.push(new ContextMenu(map, contextMenuOptions)) - 1;

bindLabelEvents(flightPath[i], distanceLables[pos]);
}

var bindLabelEvents = function(polyline, label) {
google.maps.event.addListener(polyline, 'mouseover', function(mouseEvent) {
label.show(mouseEvent.latLng);
});

google.maps.event.addListener(polyline, 'mouseout', function(mouseEvent) {
label.hide();
});
};

关于javascript - ContextMenu.js 标签显示所有菜单项的最后一个条目的标签,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/32429290/

24 4 0
Copyright 2021 - 2024 cfsdn All Rights Reserved 蜀ICP备2022000587号
广告合作:1813099741@qq.com 6ren.com