我正在使用 leaflet market cluster,并将标记设置为圆形标记。
我们在开始时将变量设置为
如果我们先有了搜索结果,然后再进行另一次搜索并且结果为零,那么上述方法是可行的。但是,如果我们首先进行了搜索并且得到了“零结果”,那么就会出现错误:
我对如何绘制标记并使“var circles”在两种情况下都可用感到非常困惑。
引用:
Leaflet 版本:leaflet@1.3.1
Leaflet 群集版本:markercluster@1.3.0
注意
$.fn.almDone...
和$.fn.almEmpty...
只是我用于 ajax 回调的一些函数。
如果有结果,我会在地图上绘制一些标记,并在第二个回调中清除已绘制的标记,如果没有结果,则告诉用户我们没有结果,因此没有标记。
我们有两个包含值的数组,我从中获取坐标:
var longitude = [];
var latitude = [];
var count = [];
我们在开始时将变量设置为
stopAjax true
:var stopAjax = true;
点击后,我们开始搜索并将stopAjax
设置为false
$(".alm-filters--button").on("click", function(){
stopAjax = false;
});
这就是基本的逻辑,现在我们定义两个函数:
// This is run when we finish the call and we have results
// So on the callback we run the function to draw the markers
$.fn.almDone = function(alm){
drawMarkers();
};
// Let's draw the markers
function drawMarkers() {
// This is the logic to read latitude and longitude arrays
// and push to a new array the two values as pair of coords
// eg. 4.66, 4,5555
var i;
for (i = 0; i < longitude.length; ++i) {
pair=[ parseFloat( latitude[i] ) , parseFloat( longitude[i] ) ]
count.push( pair );
$("#searchNations").removeAttr("disabled");
$(this).attr("disabled", "disabled");
var myYears = $('#years').val();
$("#ajax-load-more ul").attr("data-meta-value", myYears);
};
// We check if we said to run ajax
// and if so draw the markers
// for myself I had also to retrieve those coords
// and place them in individual inputs for the form
if(stopAjax == false) {
L.MarkerCluster.include({
spiderfy: function(e) {
var childMarkers = this.getAllChildMarkers();
this._group._unspiderfy();
this._group._spiderfied = this;
// Fill the markersList.
markersList.innerHTML = childMarkers
.map((marker, index) => `<li>Marker ${index + 1}: ${marker.getLatLng()}</li>`)
.join('');
// If there are any childMarkers
// draw the cluster and run a form
if(childMarkers.length > 0) {
// Match the lat and lng numbers from the string returned by getLatLng()
const [lat, lng] = `${ childMarkers[0].getLatLng() }`.match(/(-?\d+.\d*)/gi);
// Construct the required string value from the extracted numbers
const requiredString = `${ lat }, ${ lng }`;
// Use requiredString to populate the value attribute of the input field in OP
// grab the coords in individual inputs
// that's just for my specific case
$("#longiTude").attr("value",lat);
$("#latiTude").attr("value", lng);
// run a form to see results
submitSearchForm();
}
},
unspiderfy: function() {
this._group._spiderfied = null;
}
});
// this bit is for single marker
// we want to add a click to run the form
// also for the single marker and grab the coords
// and place them in inputs for the form
var mcg = L.markerClusterGroup().addTo(map);
circles = new L.MarkerClusterGroup();
for (var i = 0; i < count.length; i++) {
var a = count[i];
var circle = new L.CircleMarker([a[0], a[1]]);
circles.addLayer(circle);
circle.on('click', function (e) {
var curPos = e.target.getLatLng();
$("#longiTude").val(curPos.lat);
$("#latiTude").val(curPos.lng);
submitSearchForm();
});
}
// we add the markers to the map
map.addLayer(circles);
// we empty the arrays for the future calls
count = [];
longitude = [];
// we set again stopAjax var to true to reset
stopAjax = true;
}
}
然后是零结果函数
//This is run when we have zero results
$.fn.almEmpty = function(alm) {
stopAjax = true;
clearMarkers();
};
// We empty the arrays and we
// clear the previously drawn markers
function clearMarkers(stopAjax) {
if(stopAjax == true) {
count = [];
longitude = [];
map.removeLayer(circles);
}
// if zero results, we launch a modal to advise user
$('#zeroResults').modal('show');
}
如果我们先有了搜索结果,然后再进行另一次搜索并且结果为零,那么上述方法是可行的。但是,如果我们首先进行了搜索并且得到了“零结果”,那么就会出现错误:
这是正确的,因为自从我们进入“空函数”以来,我们尝试清除标记,但我们从未定义过它们,因为我们从未进入过定义圆形的绘制标记函数。Uncaught ReferenceError: circles is not defined
我对如何绘制标记并使“var circles”在两种情况下都可用感到非常困惑。
引用:
附言:欢迎任何人改善逻辑,无论问题如何