我正在制作一张带有传单滑块的地图，因为滑块经过几天显示在某一天设置的每个标记，到目前为止一直很好，但问题是放置的标记永远不会被删除，它们会停留，即使我再次到达同一天它只是克服旧标记。 我已经改变了original slider 中的一些内容，以便它可以工作。修改后的文件现在看起来像这样
L.Control.SliderControl = L.Control.extend({
options: {
position: 'topright',
layers: null,
timeAttribute: 'time',
isEpoch: false, // whether the time attribute is seconds elapsed from epoch
startTimeIdx: 0, // where to start looking for a timestring
timeStrLength: 19, // the size of yyyy-mm-dd hh:mm:ss - if millis are present this will be larger
maxValue: -1,
minValue: 0,
showAllOnStart: false,
markers: null,
range: false,
follow: false,
alwaysShowDate : false,
rezoom: null
},
initialize: function (options) {
L.Util.setOptions(this, options);
this._layer = this.options.layer;
},
extractTimestamp: function(time, options) {
if (options.isEpoch) {
time = (new Date(parseInt(time))).toString(); // this is local time
}
return time.substr(options.startTimeIdx, options.startTimeIdx + options.timeStrLength);
},
setPosition: function (position) {
var map = this._map;
if (map) {
map.removeControl(this);
}
this.options.position = position;
if (map) {
map.addControl(this);
}
this.startSlider();
return this;
},
_updateCurrentDiv: function (startIdx, endIdx) {
this.$currentStartDiv.html(this.options.markers[startIdx].feature.properties[this.options.timeAttribute]);
this.$currentEndDiv.html(this.options.markers[endIdx].feature.properties[this.options.timeAttribute]);
this.$currentStartDiv = $('#slider-current .start-time', sliderContainer);
this.$currentEndDiv = $('#slider-current .end-time', sliderContainer);
this._updateCurrentDiv(0,0);
},
onAdd: function (map) {
this.options.map = map;
// Create a control sliderContainer with a jquery ui slider
var sliderContainer = L.DomUtil.create('div', 'slider', this._container);
$(sliderContainer).append('<div id="slider-min"></div><div id="leaflet-slider" style="width:280px; inline-block; margin: 0 5px 0 5px;"></div><div id="slider-max"></div><div id="slider-current"><span class="start-time"></span>-<span class="end-time"></span></div>');
//Prevent map panning/zooming while using the slider
$(sliderContainer).mousedown(function () {
map.dragging.disable();
});
$(document).mouseup(function () {
map.dragging.enable();
//Hide the slider timestamp if not range and option alwaysShowDate is set on false
if (options.range || !options.alwaysShowDate) {
$('#slider-timestamp').html('');
}
});
var options = this.options;
this.options.markers = [];
//If a layer has been provided: calculate the min and max values for the slider
if (this._layer) {
var index_temp = 0;
this._layer.eachLayer(function (layer) {
options.markers[index_temp] = layer;
++index_temp;
});
options.maxValue = index_temp - 1;
this.options = options;
} else {
console.log("Error: You have to specify a layer via new SliderControl({layer: your_layer});");
}
return sliderContainer;
$('#slider-min', sliderContainer).html(this.options.markers[this.options.minValue].feature.properties[this.options.timeAttribute]);
$('#slider-max', sliderContainer).html(this.options.markers[this.options.maxValue].feature.properties[this.options.timeAttribute]);
},
onRemove: function (map) {
//Delete all markers which where added via the slider and remove the slider div
for (i = this.options.minValue; i < this.options.maxValue; i++) {
map.removeLayer(this.options.markers[i]);
}
$('#leaflet-slider').remove();
},
startSlider: function () {
_options = this.options;
_extractTimestamp = this.extractTimestamp
var index_start = _options.minValue;
if(_options.showAllOnStart){
index_start = _options.maxValue;
if(_options.range) _options.values = [_options.minValue,_options.maxValue];
else _options.value = _options.maxValue;
}
$("#leaflet-slider").slider({
range: _options.range,
value: _options.value,
values: _options.values,
min: _options.minValue,
max: _options.maxValue,
step: 1,
slide: function (e, ui) {
var markall = new L.markerClusterGroup();
//var markall = new L.layerGroup();
var map = _options.map;
var fg = L.featureGroup();
if(!!_options.markers[ui.value]) {
// If there is no time property, this line has to be removed (or exchanged with a different property)
if(_options.markers[ui.value].feature !== undefined) {
if(_options.markers[ui.value].feature.properties[_options.f ]){
if(_options.markers[ui.value]) $('#slider-timestamp').html(
_extractTimestamp(_options.markers[ui.value].feature.properties[_options.timeAttribute], _options));
}else {
console.error("Time property "+ _options.timeAttribute +" not found in data");
}
}else {
// set by leaflet Vector Layers
if(_options.markers [ui.value].options[_options.timeAttribute]){
if(_options.markers[ui.value]){ $('#slider-timestamp').html(
_extractTimestamp(_options.markers[ui.value].options[_options.timeAttribute], _options));
$('#start').html(_extractTimestamp(_options.markers[ui.values[0]].options[_options.timeAttribute], _options));
$('#end').html( _extractTimestamp(_options.markers[ui.values[1]].options[_options.timeAttribute], _options));
}
}else {
console.error("Time property "+ _options.timeAttribute +" not found in data");
}
}
var i;
// clear markers
markall.clearLayers();
map.removeLayer(markall);
//alert("test");
if(_options.range){
// jquery ui using range
for (i = ui.values[0]; i <= ui.values[1]; i++){
if(_options.markers[i]) {
// map.addLayer(_options.markers[i]);
fg.addLayer(_options.markers[i]);
markall.addLayer(daygroups[i]);
}
}
map.addLayer(markall);
}else if(_options.follow){
for (i = ui.value - _options.follow + 1; i <= ui.value ; i++) {
if(_options.markers[i]) {
// map.addLayer(_options.markers[i]);
fg.addLayer(_options.markers[i]);
markall.addLayer(daygroups[i]);
}
}
map.addLayer(markall);
}else{
for (i = _options.minValue; i <= ui.value ; i++) {
if(_options.markers[i]) {
// map.addLayer(_options.markers[i]);
fg.addLayer(_options.markers[i]);
markall.addLayer(daygroups[i]);
}
}
map.addLayer(markall);
}
};
if(_options.rezoom) {
map.fitBounds(fg.getBounds(), {
maxZoom: _options.rezoom
});
}
}
});
if (!_options.range && _options.alwaysShowDate) {
$('#slider-timestamp').html(_extractTimeStamp(_options.markers[index_start].feature.properties[_options.timeAttribute], _options));
}
for (i = _options.minValue; i <= index_start; i++) {
//_options.map.addLayer(_options.markers[i]);
}
}
});
L.control.sliderControl = function (options) {
$('span').show();
return new L.Control.SliderControl(options);
};
正如你所看到的，我多次尝试清空群集和地图，但似乎发生同样的事情，标记没有删除，任何帮助都会受到赞赏，谢谢。