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Exception:Value cannot be null. (Parameter 'json') #27

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beethmon opened this issue Sep 26, 2023 · 3 comments · Fixed by #44
Closed

Exception:Value cannot be null. (Parameter 'json') #27

beethmon opened this issue Sep 26, 2023 · 3 comments · Fixed by #44
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bug Something isn't working
Milestone
1.0.0-preview5

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@beethmon
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beethmon commented Sep 26, 2023 •
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It works but throw this Exception: Value cannot be null. (Parameter 'json')
my cs code:

try
{
				await hybridWebView.InvokeJsMethodAsync<int>("TestFun", 123, 456);
}
catch (Exception ex)
{
				Debug.WriteLine(ex.Message);
}

my xaml code:

<ContentPage
    x:Class="ActionTracer.MainPage"
    xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
    xmlns:ejl="clr-namespace:HybridWebView;assembly=HybridWebView">
    <ejl:HybridWebView
        x:Name="hybridWebView"
        HybridAssetRoot="hybrid"
        MainFile="index.html"
        MaximumWidthRequest="600"
        MinimumHeightRequest="350"
        RawMessageReceived="hybridWebView_RawMessageReceived" />
</ContentPage>

my html code:

<!DOCTYPE html>
<html lang="">

<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">

    <meta name="viewport" content="width=device-width, initial-scale=1.0, 
minimum-scale=1.0, maximum-scale=1.0, viewport-fit=cover, user-scalable=no">
    <link rel="icon" href="<%= BASE_URL %>favicon.ico">
    <title>
        <%= htmlWebpackPlugin.options.title %>
    </title>
    <script src="_hwv/HybridWebView.js"></script>
</head>
<script>
    function TestFun(value1, value2) {
        alert(value1 + " " + value2);
    }
</script>
@Eilon
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Eilon commented Sep 26, 2023

I'll take a look!

@beethmon
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I'll take a look!

Thanks,I fix this problem，cause I forgot return
but I had another question
Can I disable Android WebView TextZoom on this？
I can set it by use blazorWebView in the Init event:

                private void blazorWebView_BlazorWebViewInitialized(object sender, Microsoft.AspNetCore.Components.WebView.BlazorWebViewInitializedEventArgs e)
                {
        #if ANDROID
                    e.WebView.Settings.TextZoom = 100;
                   e.WebView.Settings.SetSupportZoom(false);
        #endif
                }

but It seems private in your library
=>private Android.Webkit.WebView PlatformWebView

Eilon added a commit that referenced this issue Feb 10, 2024
@Eilon
Fix NullRef when JS method has no return value
a77e13b 
The InvokeJsMethodAsync() method now returns null if there was no return value.

Fixes #27
This was referenced Feb 10, 2024
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Closed
@Eilon Eilon added this to the 1.0.0-preview5 milestone Feb 10, 2024
@Eilon Eilon added the bug Something isn't working label Feb 10, 2024
@Eilon
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Eilon commented Feb 10, 2024

For the NullRef I have a fix here: #44

And for the initialization/zoom issue I logged #45 to track supporting that.

@Eilon Eilon closed this as completed in #44 Feb 11, 2024
Eilon added a commit that referenced this issue Feb 11, 2024
@Eilon
Fix NullRef when JS method has no return value (#44)
195ddf7 
The InvokeJsMethodAsync() method now returns null if there was no return value.

Fixes #27
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Fix NullRef when JS method has no return value Eilon/MauiHybridWebView
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@Eilon @beethmon