如何正确过滤 yandex 地图上的数据？

Posted 2023-03-25

【中文标题】如何正确过滤 yandex 地图上的数据？

【英文标题】：How correct filter data on yandex maps?

【发布时间】：2019-02-24 15:36:59

【问题描述】：

我正在尝试过滤 yandex 地图上的数据。 CodePen Example

如果基站有多个频段（2G、3G 和 4G），那么如果它的至少一个频段在过滤器中，那么它应该在结果中。

我有 listBoxControl 和 listBoxItems = ['2G', '3G', '4G']

我的过滤函数如下所示：

function getFilterFunction(categories)
  return function(obj)
    let bsBands = obj.has_bands;
    /* How correct filter data? */
    return categories['2G'] && categories['3G'] && categories['4G'];
  

GeoJSON 看起来像这样：

"count": 4,
"next": null,
"previous": null,
"type": "FeatureCollection",
"features": [
    
        "id": 1,
        "region_prefix": "97",
        "cell_site_number": 1,
        "description": "",
        "address": "",
        "commissioning": "",
        "bs_id": "",
        "height_asl": 0,
        "bands": [
            
                "name": "2G",
                "frequency": "900"
            ,
            
                "name": "2G",
                "frequency": "1800"
            ,
            
                "name": "3G",
                "frequency": "2100"
            ,
            
                "name": "4G",
                "frequency": "1800"
            ,
            
                "name": "4G TDD",
                "frequency": "2600"
            
        ],
        "status": true,
        "type": "Feature",
        "geometry": 
            "type": "Point",
            "coordinates": [55.755815, 37.613]
        ,
        "properties": 
            "balloonContentHeader": "balloonContentHeader",
            "balloonContentBody": "balloonContentBody",
            "balloonContentFooter": "balloonContentFooter",
            "clusterCaption": "clusterCaption",
            "hintContent": "hintContent",
            "iconCaption": "2G 3G 4G"
        ,
        "has_bands": [
            "3G",
            "2G",
            "4G"
        ]
    ,
    
        "id": 2,
        "region_prefix": "97",
        "cell_site_number": 2,
        "description": "",
        "address": "",
        "commissioning": "",
        "bs_id": "",
        "height_asl": 0,
        "bands": [
            
                "name": "2G",
                "frequency": "900"
            ,
            
                "name": "2G",
                "frequency": "1800"
            ,
            
                "name": "3G",
                "frequency": "2100"
            ,
            
                "name": "4G",
                "frequency": "1800"
            ,
            
                "name": "4G TDD",
                "frequency": "2600"
            
        ],
        "status": true,
        "type": "Feature",
        "geometry": 
            "type": "Point",
            "coordinates": [55.759, 37.613]
        ,
        "properties": 
            "balloonContentHeader": "balloonContentHeader",
            "balloonContentBody": "balloonContentBody",
            "balloonContentFooter": "balloonContentFooter",
            "clusterCaption": "clusterCaption",
            "hintContent": "hintContent",
            "iconCaption": "2G 3G 4G"
        ,
        "has_bands": [
            "3G",
            "2G",
            "4G"
        ]
    ,
    
        "id": 3,
        "region_prefix": "97",
        "cell_site_number": 3,
        "description": "",
        "address": "",
        "commissioning": "",
        "bs_id": "",
        "height_asl": 0,
        "bands": [
            
                "name": "3G",
                "frequency": "2100"
            
        ],
        "status": true,
        "type": "Feature",
        "geometry": 
            "type": "Point",
            "coordinates": [55.7204, 37.6167]
        ,
        "properties": 
            "balloonContentHeader": "balloonContentHeader",
            "balloonContentBody": "balloonContentBody",
            "balloonContentFooter": "balloonContentFooter",
            "clusterCaption": "clusterCaption",
            "hintContent": "hintContent",
            "iconCaption": "3G"
        ,
        "has_bands": [
            "3G",
        ]
    ,
    
        "id": 4,
        "region_prefix": "97",
        "cell_site_number": 4,
        "description": "",
        "address": "",
        "commissioning": "",
        "bs_id": "",
        "height_asl": 0,
        "bands": [
            
                "name": "4G",
                "frequency": "1800"
            ,
            
                "name": "4G TDD",
                "frequency": "2600"
            
        ],
        "status": true,
        "type": "Feature",
        "geometry": 
            "type": "Point",
            "coordinates": [55.7704, 37.6119]
        ,
        "properties": 
            "balloonContentHeader": "balloonContentHeader",
            "balloonContentBody": "balloonContentBody",
            "balloonContentFooter": "balloonContentFooter",
            "clusterCaption": "clusterCaption",
            "hintContent": "hintContent",
            "iconCaption": "4G"
        ,
        "has_bands": [
            "4G"
        ]
    ]

【问题讨论】：

预期的输出是什么？

@molamk，根据文档tech.yandex.com/maps/doc/jsapi/2.1/ref/reference/…过滤功能。将单个对象添加到 ObjectManager。如果函数返回 true，则对象将被处理。如果为 false，则该对象将被排除在进一步处理之外。字符串也可以作为过滤器传递。对于过滤器，您可以指定返回 true 或 false 的表达式。

【参考方案1】：

我自己解决了这个问题。 CodePen Example

function getBand(e, i, a)
    let Band = this.valueOf();
    return e === Band; 


function getFilterFunction(categories)
    return function(obj)
        let bsBands = obj.has_bands;
        let has2G = bsBands.find(getBand, '2G');
        let has3G = bsBands.find(getBand, '3G');
        let has4G = bsBands.find(getBand, '4G');
        return (categories['2G'] && has2G) || (categories['3G'] && has3G) || (categories['4G'] && has4G);