BlazorLeaflet not working with WebAssembly and .net core 3.1

[mennowo]

Hello,

when I download the repository and run the sample, all works fine. However, when I try integrating a map in my own application, I get this error:

Microsoft.JSInterop.JSException: Could not find 'leafletBlazor' in 'window.window'.

I referenced the BlazorLeaflet.dll file I built myself from my project and added a script reference in index.html. Do I have to do anything beyond that to get it to work?

Thanks! Greets, Menno

[mennowo]

A follow-up: I get the same error when using the lib in a server project.

It does however work (server-side only, not with WebAssembly), when I include the BlazorLeaflet project in my own solution, and reference the project from my web app.

[losbaltica]

Same issue here. The only way I manage to run this package is by downloading project and then referencing to my app

[paud0]

Similiar issue in client-side Blazor Webassembly (.net 5.0): "Error: Could not find 'window.leafletBlazor.create' ('leafletBlazor' was undefined)."

Am I missing something? Should I create a new issue for that?

[bryanrcarlson]

I was having similar issues; resolved them by referencing leaflet.js in index.html/_Host.cshtml. The README doesn't specify to do this, but I believe you have to?

From sample project:

    <link rel="stylesheet" href="https://unpkg.com/[email protected]/dist/leaflet.css"
          integrity="sha512-xwE/Az9zrjBIphAcBb3F6JVqxf46+CDLwfLMHloNu6KEQCAWi6HcDUbeOfBIptF7tcCzusKFjFw2yuvEpDL9wQ=="
          crossorigin="" />
    <script src="https://unpkg.com/[email protected]/dist/leaflet.js"
            integrity="sha512-gZwIG9x3wUXg2hdXF6+rVkLF/0Vi9U8D2Ntg4Ga5I5BZpVkVxlJWbSQtXPSiUTtC0TjtGOmxa1AJPuV0CPthew=="
            crossorigin=""></script>

[erikthysell]

My experience was that with an older browser I got the window.window error, but with newer browsers it seems to work. I actually believe (as far as I can remember) it was a challenge for older browsers with the spread operator ... that is used in the leafletBlazorInterops.js file.

[BenBurge]

I was getting the same error message as shown above. The fix for me was to add the following line after your leaflet script tag.

<script src="https://unpkg.com/[email protected]/dist/leaflet.js" integrity="sha256-WBkoXOwTeyKclOHuWtc+i2uENFpDZ9YPdf5Hf+D7ewM=" crossorigin=""></script>
<script src="_content/BlazorLeaflet/leafletBlazorInterops.js"></script>

I am using Leaflet 1.9.3 and the 0.4.0 alpha release of the BlazorLeaflet library from NuGet. I found this by reviewing the example section and saw this was the only difference between my code and the example code.

[K2-Software]

Do you have any info about this problem? For me the only possibility to solve this was to add the BlazorLeaflet project to my solution, other combinations had failed.