设置传单中图层的缩放级别 [英] Setting zoom level for layers in leaflet

问题描述

从此处继续查询:

https://gis.stackexchange.com/questions/340223 /leaflet-make-features-gone-when-zoom-out

缩小时，我希望某些图层完全消失.

I would like to have some layers completely gone when zooming out.

我尝试过这样的事情:

 map.on('zoomend', function (e) {
  zoom_based_layerchange();
 });

 function clean_map() {
 map.eachLayer(function (layer) {
 if (layer instanceof L.GeoJSON)
{
    map.removeLayer(layer);
 }
//console.log(layer);
 });
 }

 function zoom_based_layerchange() {
//console.log(map.getZoom());

  var currentZoom = map.getZoom();
   switch (currentZoom) {
case 8:     //refers to the zoom level: 8
    clean_map();
    sitis.addTo(map); //show "sitis" geoJSON layer
    break;
case 12:
    //clean_map(); - removed, as I don't need to remove the layer visible at lower zoom level
    church.addTo(map);   //show "church" geoJSON layer
    break;
default:
    // do nothing
    break;

} }

但不幸的是，这不是我要寻找的东西，因为一旦一层消失，另一层即将进入.最终，按照此处的示例缩小到第1级时，最顶层仍然保持可见:

but unfortunately it isn't a thing, which I am looking for, because once one layer disappear, another one is coming in. Eventually, the very top layer remain still visible when zooming out to level 1 as per the example here:

http://jsfiddle.net/expedio/kuovyw8m/

因为我想缩小图层，所以尝试了如下操作:

Because I would like to have layers gone as zoom out I tried sth like this:

 map.on('zoomend', function () {
   if (map.getZoom() < 10 {
    map.removeLayer(sitec);
   }
   if (map.getZoom() < 12 {
    map.removeLayer(test);
   }
   else {
    map.addLayerGroup([sitec,test]);
    }
});

它不能完全正常工作. COnsole说:

it doesn't work completely. COnsole says:

未捕获到的SyntaxError:意外令牌'{'，与此处的示例矛盾:

Uncaught SyntaxError: Unexpected token '{' which is a contradiction to the example here:

https://gis.stackexchange.com/questions/258515 /show-hide-markers-取决于缩放级别

在其他情况下，我有:

未捕获的TypeError:sitec.removeFrom不是函数 在我((索引):174) 在i.fire(leaflet.js:5) 在i._moveEnd(leaflet.js:5) 在我(leaflet.js:5)

Uncaught TypeError: sitec.removeFrom is not a function at i. ((index):174) at i.fire (leaflet.js:5) at i._moveEnd (leaflet.js:5) at i. (leaflet.js:5)

当键入如下代码时:

 map.on('zoomend', function () {
 var z = map.getZoom();

 if (z > 12) {
 return sitec.addTo(map);
 }

 if (z > 14) {
 return test.addTo(map);
 }

 return sitec.removeFrom(map);
 });

按照此处的示例:

https://gis.stackexchange.com/questions/182657/zoom-dependent -传单中的图层

我最后尝试的是这里提供的插件:

Last thing which I tried was the plugin available here:

https://github.com /auto-mat/leaflet-zoom-show-hide/blob/master/demo.html

我放在哪里:

    zsh = new ZoomShowHide();
    zsh.addTo(map);
    sitec.min_zoom = 9;
    zsh.addLayer(sitec);
    test.min_zoom = 11;
    zsh.addLayer(test);

但仍然令人失望.控制台显示:

but still wothiut result. The console says:

未捕获的TypeError:layer.addTo不是函数->来自 leaflet-zoom-hide隐藏21 layer.addTo(this._layerGroup);

uncaught TypeError: layer.addTo is not a function -> from leaflet-zoom-hide 21 layer.addTo(this._layerGroup);

有人知道如何处理吗?

我的代码在这里可用:

推荐答案

我找到了一种解决方案，我们可以用越来越长(虽然更实用)的方式进行解释:

I found one of the solution, that we can explain by shorter and longer (although more practical) way:

根据以下示例:

https://gis.stackexchange.com/questions/258515 /show-hide-markers-取决于缩放级别

我们可以这样做:

  map.on('zoomend', function() {
  if (map.getZoom() <6){
    map.removeLayer(job);//1st geoJSON layer
   }else{
  map.addLayer(job);
   }
    if (map.getZoom() <7){
    map.removeLayer(job2); //2nd geoJSON layer
    }else{
    map.addLayer(job2);
    }
    if (map.getZoom() <8){
    map.removeLayer(job3); //3rd geoJSON layer
    }else{
    map.addLayer(job3);
    }
  });

对我们来说更好，而不是较短的...

which is better for us, unlike to shorter one...

  map.on('zoomend', function() {
    if (map.getZoom() <6){
    map.removeLayer(job);//1st geoJSON layer
   }
   if (map.getZoom() <8){
    map.removeLayer(job2);//2nd geoJSON layer
   }
   if (map.getZoom() <10){
    map.removeLayer(job3);//3rd geoJSON layer
   }
   else {
    map.addLayer(job);
    map.addLayer(job2);
    map.addLayer(job3);
    } //all layers are to be switched on, when zoom level reach 10
   });

当缩放级别达到该功能中给定的最大值时可以切换所有图层.

that can switch all layers back when zoom level reach max value given in the function.

这篇关于设置传单中图层的缩放级别的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！