我正在尝试将一个包含多个地图的页面(一个包含一组路由的所有页面,每个路由一个的页面)放在一起,每个页面都放在不同的(Bootstrap)选项卡中。我通过重复并独立地给每个地图分配我想要的click和pointermove事件,来使用最重复的代码,但是理想情况下,我会以某种循环的方式来分配它们。
我的尝试是我在下面粘贴的内容,但是可以使用,但仅适用于最终地图-如果更改地图的顺序,则任何一张都可以使用,但前提是最后一张。 this other question being the closest找不到我所寻找的方向,尽管我无法充分利用所提供的答案,但提到了仅在最后一张地图上工作的相同问题。 是否有办法遍历这些事件并使它们在多个视图/地图上工作?
非常感谢任何方向!
Javascript:
//----------/MAP 0/----------//
var myView0 = new ol.View({
center: ol.proj.fromLonLat([-87.068669, 8.470072]),
zoom: 3,
});
var map0 = new ol.Map({
layers: [
new ol.layer.Tile({
source: new ol.source.OSM()
}),
vectorLayerJNY10,
vectorLayerJNY11,
vectorLayerJNY12,
hoverLayers['route'],
],
target: 'map0',
view: myView0,
});
//----------/MAP 1/----------//
var myView1 = new ol.View({
center: ol.proj.fromLonLat([-94.803044, 36.719405]),
zoom: 3.5,
});
var map1 = new ol.Map({
layers: [
new ol.layer.Tile({
source: new ol.source.OSM()
}),
vectorLayerJNY10,
hoverLayers['route'],
],
target: 'map1',
view: myView1,
});
//----------/MAP 2/----------//
var myView2 = new ol.View({
center: ol.proj.fromLonLat([-114.778097, 32.698996]),
zoom: 4,
});
var map2 = new ol.Map({
layers: [
new ol.layer.Tile({
source: new ol.source.OSM()
}),
vectorLayerJNY11,
hoverLayers['route'],
],
target: 'map2',
view: myView2
});
//----------/MAP 3/----------//
var myView3 = new ol.View({
center: ol.proj.fromLonLat([-93.988196, 19.253431]),
zoom: 4
});
var map3 = new ol.Map({
layers: [
new ol.layer.Tile({
source: new ol.source.OSM()
}),
vectorLayerJNY12,
hoverLayers['route'],
],
target: 'map3',
view: myView3
});
var maps = [map0, map1, map2, map3];
var views = [myView0, myView1, myView2, myView3]
var mapOnClick = function (event) {
if (event.map.hasFeatureAtPixel(event.pixel) === true) {
var name = event.map.forEachFeatureAtPixel(event.pixel, function(feature) {
return feature.get('name');
})
var coordinate = event.coordinate;
content.innerHTML = name;
olay.setPosition(coordinate);
} else {
olay.setPosition(undefined);
closer.blur();
}
};
var elmHover = function(evt) {
if (evt.dragging) {
return;
}
var pixel = evt.map.getEventPixel(evt.originalEvent);
var map = elem;
hover(pixel, map);
};
var cursor = function(evt) {
elem.getTargetElement().style.cursor = elem.hasFeatureAtPixel(evt.pixel) ? 'pointer' : '';
};
var mapResize = function(event){
setTimeout(function() {
elem.updateSize();
}, 200);
};
for(var i = 0; i < maps.length; i++){
var elem = maps[i];
var container = document.getElementById('popup' + i);
var content = document.getElementById('popup-content' + i);
var closer = document.getElementById('popup-closer' + i);
var overlays = [];
overlays[i] = new ol.Overlay({
element: container,
autoPan: true,
autoPanAnimation: {
duration: 250
}
});
elem.addOverlay(overlays[i]);
olay = overlays[i];
view = views[i];
elem.on('pointermove', elmHover);
elem.on('singleclick', mapOnClick);
elem.on('pointermove', cursor);
closer.onclick = function() {
layover.setPosition(undefined);
closer.blur();
return false;
};
$('.nav-tabs').on('shown.bs.tab', mapResize)
$('.nav-tabs').on('hide.bs.tab', function(event){
elem.setView(view);
olay.setPosition(undefined);
});
}
HTML(以防万一:3):
<ul class="nav nav-tabs nav-justified" role="tablist">
<li class="nav-item" >
<a class="nav-link active" data-toggle="tab" href="#About">About</a>
</li>
<li class="nav-item" >
<a class="nav-link" data-toggle="tab" href="#Journey-I">Journeys I</a>
</li>
<li class="nav-item" >
<a class="nav-link" data-toggle="tab" href="#Journey-II">Journey II</a>
</li>
<li class="nav-item" >
<a class="nav-link" data-toggle="tab" href="#Journey-III">Journey III</a>
</li>
</ul>
<div class="tab-content">
<div id="About" class="tab-pane fade show active" role="tabpanel">
<h3>About</h3>
<div id="map0" class="map"></div>
<div id="popup0" class="ol-popup">
<a href="#" id="popup-closer0" class="ol-popup-closer"></a>
<div id="popup-content0"></div>
</div>
</div>
<div id="Journey-I" class="tab-pane fade" role="tabpanel">
<h3>Journey I</h3>
<div id="map1" class="map"></div>
<div id="popup1" class="ol-popup">
<a href="#" id="popup-closer1" class="ol-popup-closer"></a>
<div id="popup-content1"></div>
</div>
</div>
<div id="Journey-II" class="tab-pane fade" role="tabpanel">
<h3>Journey II</h3>
<div id="map2" class="map"></div>
<div id="popup2" class="ol-popup">
<a href="#" id="popup-closer2" class="ol-popup-closer"></a>
<div id="popup-content2"></div>
</div>
</div>
<div id="Journey-III" class="tab-pane fade" role="tabpanel">
<h3>Journey III</h3>
<div id="map3" class="map"></div>
<div id="popup3" class="ol-popup">
<a href="#" id="popup-closer3" class="ol-popup-closer"></a>
<div id="popup-content3"></div>
</div>
</div>
<script src="{{ url_for('static', filename='JS/OLmap_ajall.js') }}" type="text/javascript"></script>
</div>
就像您检查的问题中所说的,这是上下文的问题。
在每个事件的处理程序中,您正在使用在循环上获取值的变量elem
,olay
,view
。问题在于,当事件发生时,这些变量的值将引用它们各自数组的最后一个映射,覆盖和视图。
有几种解决方法。我建议您使用函数[bind
)的JavaScript - function bind方法。
var mapOnClick = function (event) {
if (this.map.hasFeatureAtPixel(event.pixel) === true) {
var name = this.map.forEachFeatureAtPixel(event.pixel, function(feature) {
return feature.get('name');
})
var coordinate = event.coordinate;
this.content.innerHTML = name;
this.overlay.setPosition(coordinate);
} else {
this.overlay.setPosition(undefined);
this.closer.blur();
}
};
var elmHover = function(evt) {
if (evt.dragging) {
return;
}
var pixel = this.map.getEventPixel(evt.originalEvent);
// var map = elem; <- what is this for?
hover(pixel, this.map); // <- this function is not defined, look out
};
var cursor = function(evt) {
this.map.getTargetElement().style.cursor =
this.map.hasFeatureAtPixel(evt.pixel) ? 'pointer' : '';
};
var mapResize = function(event){
setTimeout(function() {
this.map.updateSize();
}, 200);
};
var closerOnClick = function() {
this.overlay.setPosition(undefined); // I am guessing is overlay
this.closer.blur();
return false;
}
var onHide = function(event){
this.map.setView(this.view); // <- don't understand this
this.overlay.setPosition(undefined);
}
var contexts = [
{ map: map0, view: myView0 },
{ map: map1, view: myView1 },
{ map: map2, view: myView2 },
{ map: map3, view: myView3 }
];
for(var i = 0; i < contexts.length; i++){
contexts[i].container = document.getElementById('popup' + i);
contexts[i].content = document.getElementById('popup-content' + i);
contexts[i].closer = document.getElementById('popup-closer' + i);
contexts[i].overlay = new ol.Overlay({
element: contexts[i].container,
autoPan: true,
autoPanAnimation: {
duration: 250
}
});
contexts[i].map.addOverlay(contexts[i].overlay);
contexts[i].mapOnClick = mapOnClick.bind(contexts[i]);
contexts[i].elmHover = elmHover.bind(contexts[i]);
contexts[i].cursor = cursor.bind(contexts[i]);
contexts[i].mapResize = mapResize.bind(contexts[i]);
contexts[i].map.on('singleclick', contexts[i].mapOnClick);
contexts[i].map.on('pointermove', contexts[i].cursor);
contexts[i].closer.onclick = contexts[i].closerOnClick;
// don't understand why these are in the loop
$('.nav-tabs').on('shown.bs.tab', contexts[i].mapResize);
$('.nav-tabs').on('hide.bs.tab', contexts[i].onHide);
}
注意:我对您的代码有些不了解,加上您在每次迭代中都初始化了overlays数组,并且变量名称错误。这是很长的代码,没有检查它,因此请注意可能存在一些问题。只供您提出想法。
我注意到您使用的是jQuery,也可以使用proxy
保留上下文。尽管我注意到它已被弃用。