javascript - 单击复选框后更新 javascript 值和 View

Question

我似乎无法使用 javascript 来完成这项工作。我正在尝试根据选中的复选框更新 map 上的某些图层。 这是我的代码，也是我到目前为止所尝试的。

html:

    <div class="option-layer">
        <input type="checkbox" value="layer1" name="Administratoret">
        <input type="checkbox" value="layer11" name="njesite_adm.kml">
        <input type="checkbox" value="raster" name="njesite_adm.kml">
    </div> 

js:

    var projection = ol.proj.get('EPSG:4326');
    var raster = new ol.layer.Tile({
        source: new ol.source.OSM()
    });

    var layer1 = new ol.layer.Vector({
      source: new ol.source.Vector({
        url: 'http://localhost/maptest/test.kml',
        format: new ol.format.KML()
    })
  });

    var layer11 = new ol.layer.VectorTile({
      source: new ol.source.VectorTile({
        url: 'http://localhost/maptest/test.kml',
        format: new ol.format.KML({
          extractStyles: false
      }),
    }),
      opacity: 2,   
  });

    //**the code to get value from checkbox**
    var filter_options=[raster];
    $('input:checkbox').click(function()
    {
        var name=$(this).val().trim();
        if(this.checked)
        {
            filter_options.push(name);
            console.log('Add: ' + name);
        }
        else
        {
            var index=filter_options.indexOf(name);
            if(index > -1)
            {
                filter_options.splice(index, 1);
                console.log('Remove: ' + name + ' at index: ' + index);
            }
        }
        $('#result').html(filter_options.join('; '));
        console.log(filter_options);
    });


    var map = new ol.Map({
        layers : [raster, layer1, layer11] //this works
        layers: filter_options, //this doesnt work, the map wont shoq the layers
        target: document.getElementById('map'),
        view: new ol.View({
          center: [ 29.8187, 32.3275],
          projection: projection,
          zoom: 10,
      })
    });

我的方向正确吗？任何帮助将不胜感激。

Answer 1

当您将filter_options数组添加到 map 时，它只有一层。您正在尝试在将filter_options 数组添加到 map 后添加/删除图层。您的图层实际上并未添加到 map 中。

首先加载所有图层:

  layers : [raster, layer1, layer11] //this works for you already

然后在复选框更改事件上，处理图层可见性:

layer1.setVisible(true) or
layer1.setvisible(false)