Grouped Layers

There are 2 types of grouped layers. Both are defined by an id array. To address such layers via url parameters or via API, the id is converted from an array into a hyphen-separated string.

Example for the ids

config.json

"id": [
        "100",
        "200",
        "300"
    ],

is converted in the code to:

id = "100-200-300"

1. requests are evaluated by the server using a specific parameter

• all layers whose ids are specified must match in the url and typ fields
• no specific typ in the config.json, the 'typ' of the individual layers is used
• only one layer is created in the code (no group layer), which contains all the individual layers values in the layers field, which are then evaluated by the server

Example

{
    "id": [
        "717",
        "718",
        "719",
        "720",
        "13712",
        "13709",
        "13714",
        "13716"
    ],          
    "name": "Geobasiskarten (colored)",
    "shortname": "Map colored"
}

2. a group of different layers, without special server evaluation

• "typ"="GROUP" in the config.json
• all layers whose ids are specified can differ in the url and type fields
• Optionally, attributes on the grouped layers can be overwritten under children. Exception: visibility is not overwritten. All ids in the id array must have an equivalent in the children.
• a GroupLayer is created in the code, which contains all grouped layers

Examples

A group with 3 layers of type WMS with children, in which e.g. a gfiTheme is set.

{ 
    "id": [ "4905", "1420", "4561"], 
    "typ": "GROUP",
    "name": "Gruppe WMS - Schwermetallmessungen, Sturmflut und Eventlotse",
    "visibility": true,
    "children" :[
        {
            "id": "4905",
            "name": "Schwermetallmessungen",
            "typ": "WMS"
        },
        {
            "id": "4561",
            "name": "Eventlotse Hamburgconvention",
            "typ": "WMS",
            "minScale": "1000",
            "maxScale": "20000"
        },
        {
            "id": "1420",
            "gfiTheme": "sturmflut",
            "minScale": "2000",
            "maxScale": "10000"
        }
    ]
}

A group with 3 layers with different types with children, in which e.g. the styleId is set.

{ 
    "id": [ "27926", "1711", "18104"], 
    "typ": "GROUP",
    "name": "Gruppe OAF, WFS, SensorThings",
    "visibility": false,
    "showInLayerTree": true,
    "children" :[
        {
            "id": "27926",
            "styleId": "8712",
            "typ": "OAF",
            "gfiTheme": "schulinfo"
        },
        {
            "id": "1711",
            "styleId": "1711",
            "typ": "WFS"
        },
        {
            "id": "18104",
            "styleId": "18104",
            "typ": "SensorThings"
        }
    ]
}

A group without children. The grouped layers are used as they are specified in the services.json. The styleId is overwritten here and is applied to all grouped layers.

 {
    "id": [ "20501", "20502", "20503", "20504" ],
    "name": "Gruppe Freizeitrouten und Radfernwege (4 WFS Layer)",
    "typ": "GROUP",
    "styleId": "4515",
    "visibility": true
}