Load layer from datatable

[Yana]

Hi,

Currently i create maps by linking json file to the layer. In my understanding there is a way to provide some kind of an object as a datasource to the layer.

Can you provide example, please?

[Rumen]

Hi Yana,

Currently, RadMap does not support binding GeoJSON data from server-side and the only way is through the RadClientDataSource control or through the API on client-side.

Having that in mind, once you retrieve the data on server-side you could save it in a HiddenField control for example and on client-side, using the RadMap API you can manually bind the shapes. Following is a simple implementation of that approach:

<script type="text/javascript">
    function OnInitialize(sender, args) {
        var originalOptions = args.get_options();
        var geoJSON = document.getElementById("<%=HiddenGeoJSON.ClientID%>").value;
        originalOptions.layers[0].dataSource = { data: JSON.parse(geoJSON) };
        args.set_options(originalOptions);
    }
</script>

<asp:HiddenField runat="server" ID="HiddenGeoJSON" />

<telerik:RadMap runat="server" ID="RadMap1" Zoom="2" Width="500" Height="200">
    <ClientEvents OnInitialize="OnInitialize" />
    <CenterSettings Latitude="30" Longitude="10" />
    <LayerDefaultsSettings>
        <ShapeSettings>
            <StyleSettings>
                <FillSettings Color="green" />
                <StrokeSettings Color="black" Width="2" />
            </StyleSettings>
        </ShapeSettings>
    </LayerDefaultsSettings>
    <LayersCollection>
        <telerik:MapLayer Type="Shape">
        </telerik:MapLayer>
    </LayersCollection>
</telerik:RadMap>

And the code-behind:

protected void Page_Load(object sender, EventArgs e)
{
    HiddenGeoJSON.Value = "[{\"type\": \"Polygon\",\"coordinates\": [[[30, 10], [40, 40], [20, 40], [10, 20], [30, 10]]]}]";
}

The following examples

- Getting Started with Client-side Data Binding
- Map - Cross-Layer Integration

show how to bind a shapes layer to a data source. Client-side data source is the only supported type at the moment.

Thus, you can consider creating the json files with server code depending on the information in the database. Or, use pure client-side binding and create a webservice that will return the geoJSON objects. 

Best Regards,

Rumen
Progress Telerik

[Yana]

Thank you Rumen, i'll try to figure it out

[Rumen]

You are welcome, Yana!

Keep up the good work.

Regards, Rumen
Progress Telerik

[Yana]

Hi Rumen,

   The following example is loading file through file, but failes to load way we discussed.

   What is wrong?

   HiddenGeoJSON.Value = "{""type"":""FeatureCollection"",""crs"": { ""type"": ""name"", ""properties"": { ""name"": ""urn:ogc:def:crs:OGC:1.3:CRS84"" } },""features"":[{ ""type"": ""Feature"", ""properties"": { ""name"": ""Middlesex County, MA"",  ""vfreight_c"": ""25017"", ""color"": ""#948A54"",""longitude"": -71.3949166, ""dollars"": 0.000000, ""in_region"": 0 }, ""geometry"": { ""type"": ""MultiPolygon"", ""coordinates"": [ [ [ [ -71.898716, 42.71142 ], [ -71.745817, 42.707287 ], [ -71.636214, 42.704888 ], [ -71.631814, 42.704788 ], [ -71.542533, 42.702672 ], [ -71.351874, 42.698154 ], [ -71.330206, 42.69719 ], [ -71.294205, 42.69699 ], [ -71.278929, 42.711258 ], [ -71.267905, 42.72589 ], [ -71.255605, 42.736389 ], [ -71.25518, 42.73665 ], [ -71.238103, 42.669491 ], [ -71.256103, 42.656691 ], [ -71.172108, 42.616751 ], [ -71.165015, 42.597959 ], [ -71.158617, 42.612948 ], [ -71.13529, 42.599061 ], [ -71.076133, 42.604077 ], [ -71.058772, 42.608996 ], [ -71.028312, 42.574082 ], [ 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42.674987 ], [ -71.897089, 42.703826 ], [ -71.898716, 42.71142 ] ] ] ] } },{ ""type"": ""Feature"", ""properties"": { ""name"": ""Norfolk County, MA"",  ""vfreight_c"": ""25021"", ""color"": ""#948A54"",""longitude"": -71.1798747, ""dollars"": 0.000000, ""in_region"": 0 }, ""geometry"": { ""type"": ""MultiPolygon"", ""coordinates"": [ [ [ [ -70.780722, 42.251792 ], [ -70.785081, 42.225276 ], [ -70.826933, 42.200678 ], [ -70.85338, 42.239607 ], [ -70.844614, 42.260512 ], [ -70.824661, 42.265935 ], [ -70.811742, 42.262935 ], [ -70.788724, 42.25392 ], [ -70.780722, 42.251792 ] ] ], [ [ [ -71.156833, 42.330189 ], [ -71.122423, 42.351811 ], [ -71.10657, 42.349912 ], [ -71.116608, 42.32395 ], [ -71.126999, 42.318615 ], [ -71.152195, 42.294597 ], [ -71.164804, 42.303764 ], [ -71.178935, 42.314316 ], [ -71.156833, 42.330189 ] ] ], [ [ [ -71.381466, 41.984998 ], [ -71.381401, 42.018798 ], [ -71.458104, 42.017762 ], [ -71.498258, 42.01722 ], [ -71.50091, 42.117041 ], [ -71.478521, 42.131421 ], [ 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[Rumen]

Hi Yana,

I hope you are doing well.

While the JSON is a valid one (it validates properly), it is not supported by the Kendo UI Map widget and respectively by its ASP.NET Web Forms wrapper - RadMap for ASP.NET AJAX.

You can see which is the supported format in this help article: https://docs.telerik.com/kendo-ui/api/javascript/dataviz/ui/map/configuration/layers.datasource. 

Best Regards,
Rumen
Progress Telerik