Why I get this Chrome console error

Question

Why I get this Chrome console error

Saeed Pooladzadeh 241

Hi,

I keep encountering the below Chrome console error while it sounds like my code is correct. What should I do?

AgaveJoe 30,411 Reputation points

2024-03-03T11:24:12+00:00

What should I do?

Do basic troubleshooting. Click the content.all-js link to see what the code is trying to connect to.
Anonymous

2024-03-12T02:16:25.3866667+00:00

Hi @Saeed Pooladzadeh

Whether this issue have already resolved or not? If not, from the screenshot, we can see the issue relate the content-all.js file, whether this file is created by yourself or use some jquery plugin? If it is created by yourself, you should check or share the content. If you are using third-party JS plugin, you'd better to contact the plugin related forum.

1 answer

Your answer

AgaveJoe 30,411 Reputation points

2024-03-03T11:24:12+00:00

What should I do?

Do basic troubleshooting. Click the content.all-js link to see what the code is trying to connect to.
Anonymous

2024-03-12T02:16:25.3866667+00:00

Hi @Saeed Pooladzadeh

Whether this issue have already resolved or not? If not, from the screenshot, we can see the issue relate the content-all.js file, whether this file is created by yourself or use some jquery plugin? If it is created by yourself, you should check or share the content. If you are using third-party JS plugin, you'd better to contact the plugin related forum.

Answer 1

Bruce (SqlWork.com) 82,061 Volunteer Moderator

As it’s your custom JavaScript, or a chrome extension, we have not way of knowing. This error is typical of a chrome extension not able to communicate with the content page. see:

https://developer.chrome.com/docs/extensions/develop/concepts/messaging

Saeed Pooladzadeh 241 Reputation points

2024-03-26T00:00:40.18+00:00

I tested my code in Edge browser, without any installed extensions.

"I am still encountering a JavaScript error." My app does not contain any JavaScript code.

"It appears that developing with Blazor WebAssembly is more challenging compared to the Blazor Server version."
Bruce (SqlWork.com) 82,061 Reputation points Volunteer Moderator

2024-03-26T16:09:22.9466667+00:00

blazor needs javascript to support browser events, update the dom (display html), local storage, and to pass messages from the javascript client to the blazor app. in addition if WASM, javascript is required for network (HttpClient), file and timer support.

I'd guess a javascript syntax error in js interop. If you did not do any js interop, then I'd update the blazor packages.

you could also use the browser debug tools to see the actual error.
Saeed Pooladzadeh 241 Reputation points

2024-03-26T16:53:25.9766667+00:00

If you did not do any js interop, then I'd update the blazor packages.

"There is no JS interop in my app."

you could also use the browser debug tools to see the actual error.

How can I access the browser's debug tools? Do I need to install a specific browser?
AgaveJoe 30,411 Reputation points

2024-03-26T17:30:22.77+00:00

Have you tried creating a new Blazor Web Assembly application without modifying anything? I tried doing the same and cannot reproduce this error.
Saeed Pooladzadeh 241 Reputation points

2024-03-26T17:54:27.34+00:00

Have you tried creating a new Blazor Web Assembly application without modifying anything?

"Do you mean that I should create a new project for the second time and start coding from scratch?"

I'd guess a javascript syntax error in js interop. If you did not do any js interop, then I'd update the blazor packages.

But something that confuses me is: "Why do we need JavaScript interop?"While Blazor WASM can manipulate the DOM.

chatGPT 3.5:

Yes, Blazor WebAssembly can manipulate the DOM without directly using JavaScript interop. Blazor provides a component-based architecture that allows you to create reusable components with C# and Razor syntax. These components can render HTML elements and handle user interactions without the need for direct JavaScript manipulation.

You can use Blazor's built-in event handling mechanisms, data binding, and component lifecycle methods to dynamically update the DOM based on user interactions or changes in the application state. Blazor components are rendered as HTML elements on the client-side, and any changes made to the component's properties or state will automatically trigger the necessary DOM updates.

While JavaScript interop can be used in Blazor WebAssembly to access the DOM directly or interact with JavaScript libraries, it is not always necessary for basic DOM manipulation tasks. Blazor provides a rich set of features that allow you to create interactive web applications entirely in C# without relying on JavaScript for DOM manipulation.
AgaveJoe 30,411 Reputation points

2024-03-26T18:22:52.42+00:00

Do you mean that I should create a new project for the second time and start coding from scratch?

No. Creating a new project without modifying the code will indicate if the problem is with the code you added to the project. You did not share any code so we can only guess what's wrong.

Why do we need JavaScript interop?"While Blazor WASM can manipulate the DOM

HttpClient in Blazor WASM uses the browser's fetch API (AJAX). This information is openly covered in the official documentation.

https://learn.microsoft.com/en-us/aspnet/core/blazor/call-web-api?view=aspnetcore-8.0#add-the-httpclient-service

Saeed Pooladzadeh 241

"I am sharing my code below:"

@page "/"


@using System.Net.Http.Json
@using System.Text.Json
@using System.Diagnostics
@inject HttpClient Http


<form>

    <h1>AI Image Generator</h1>

    <div class="form-group">

        <label for="imageText">Enter your Image text:</label>

        <!-- Use @bind to bind the value of the input field to a property in our code-behind file -->
        <input type="text" class="form-control" id="imageText" @bind="@ImageText" />

    </div>

    <button @onclick="GenerateImage" type="button">Generate Image</button>

</form>


<div>
    @*  Display the generated image if available *@
    @if (generatedImageUrl != null)
        {
        <img src="@generatedImageUrl" alt="Generated Image" />
        }
</div>


@code {
    // Property to store the URL of the generated image
    private string? generatedImageUrl;
    private string? ImageText { get; set; }



    // Method to generate an image using the DeepAI API
    private async Task GenerateImage ()

        {

        // throw new Exception();

        // Call the DeepAI API to generate an image based on a sample text

        var apiUrl = $"https://api.deepai.org/api/text2img";

        // Create a new HttpClient instance
        var httpClient = new HttpClient();

        // Add the Deep AI API key to the request headers
        httpClient.DefaultRequestHeaders.Add("api-key", "quickstart-QUdJIGlzIGNvbWluZy4uLi4K");

        var formContent = new FormUrlEncodedContent(new[]
    {
            new KeyValuePair<string, string>("text", ImageText),
    });

        // Send a Post request to the Deep AI API with the user's input text
        var response = await httpClient.PostAsync(apiUrl, formContent);

        if (response.IsSuccessStatusCode)
            {
            Console.WriteLine("HTTP request has been sent successfully.");
            }
        else
            {
            Console.WriteLine("Failed to send HTTP request. Status code: " + response.StatusCode);
            }

        var jsonstring = await response.Content.ReadAsStringAsync();

        //deserialize the json string.
        var image = System.Text.Json.JsonSerializer.Deserialize<ImageResult>(jsonstring);


        // Construct the data URL for the generated logo image
        generatedImageUrl = image.output_url;

        }


    public class ImageResult
        {
        public string? id { get; set; }
        public string? output_url { get; set; }
        }

}

The endest version of firefox developer edition:

enter image description here

The endest version of Polypane:

enter image description here

"DeepAI informed me that there might be an issue with the browser extension." There are no extensions installed on the browsers mentioned above.

Please inform me.

AgaveJoe 30,411

I adjusted your code to use DI and inject the HttpClient. Your code injects HttpClient but never actually uses the injected service. The official documentation linked above illustrates how inject HttpClient in a .NET 8 Blazor application.

Testing the adjusted code below, I received a 401 (Unauthorized) response from DeepAI not a JavaScript error. Your code ignores the 401 and continues to process the response. That's not good and can cause unexpected errors.

@page "/deepai"
@using System.Net.Http.Json
@using System.Text.Json
@using System.Diagnostics
@inject HttpClient Http
@inject ILogger<DeepAi> Logger
@rendermode InteractiveWebAssembly
<h3>DeepAi</h3>
<form>
    <h1>AI Image Generator</h1>
    <div class="form-group">
        <label for="imageText">Enter your Image text:</label>
        <!-- Use @bind to bind the value of the input field to a property in our code-behind file -->
        <input type="text" class="form-control" id="imageText" @bind="@ImageText" />
    </div>
    <button @onclick="GenerateImage" type="button">Generate Image</button>
</form>
<div>
    @*  Display the generated image if available *@
    @if (generatedImageUrl != null)
    {
        <img src="@generatedImageUrl" alt="Generated Image" />
    }
</div>
@code {
    // Property to store the URL of the generated image
    private string? generatedImageUrl;
    private string? ImageText { get; set; }
    // Method to generate an image using the DeepAI API
    private async Task GenerateImage()
    {
        // throw new Exception();
        // Call the DeepAI API to generate an image based on a sample text
        var apiUrl = $"api/text2img";
        // Create a new HttpClient instance
        //var httpClient = new HttpClient();
        // Add the Deep AI API key to the request headers
        Http.DefaultRequestHeaders.Add("api-key", "quickstart-QUdJIGlzIGNvbWluZy4uLi4K");
        var formContent = new FormUrlEncodedContent(new[]
        {
            new KeyValuePair<string, string>("text", ImageText),
        });
        // Send a Post request to the Deep AI API with the user's input text
        var response = await Http.PostAsync(apiUrl, formContent);
        if (response.IsSuccessStatusCode)
        {
            Logger.LogWarning("HTTP request has been sent successfully.");
            var jsonstring = await response.Content.ReadAsStringAsync();
            //deserialize the json string.
            var image = System.Text.Json.JsonSerializer.Deserialize<ImageResult>(jsonstring);
            // Construct the data URL for the generated logo image
            generatedImageUrl = image.output_url;
        }
        else
        {
            Logger.LogWarning("Failed to send HTTP request. Status code: " + response.StatusCode);
        }
    }
    public class ImageResult
    {
        public string? id { get; set; }
        public string? output_url { get; set; }
    }
}

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Why I get this Chrome console error

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