How to insert HTML to a Blazor WASM?

Cenk 1,021

I am working on an e-commerce solution. The client side is a Blazor WASM .Net 6 project. I am trying to use a 3rd party payment gateway and unfortunately, their support is very poor. I am trying to progress by trial and error. On the checkout razor page, I am trying to inject a script that displays credit card info on the page which I am getting this script as a response from the 3rd party gateway API. Here is the sample script content and the display (https://codebeautify.org/htmlviewer#):

Ekran görüntüsü 2024-07-02 225919

    @page "/ECommerce/Checkout"
@page "/ECommerce/Checkout/{StandardDeliveryCharge:double}"
@inject IJSRuntime _jsRuntime
@inject ILocalStorageService _localStorage
@inject IProductService _productService
@inject IPaymentService _paymentService
@inject IOrderService _orderService
@inject NavigationManager _navigationManager
@using Microsoft.AspNetCore.Authorization
@attribute [Authorize]
@if (IsProcessing)
{
    <div style="position:fixed;top:50%;left:50%;margin-top:-50px;margin-left:-100px;">
        <img src="images/Spinner@1x-1.0s-200px-200px.gif" alt="waiting" />
    </div>
}
else
{
   
    <div id="iyzipay-checkout-form" class="responsive"></div>
    
    <div class="untree_co-section">
        <div class="container">
            <EditForm Model="Order.OrderHeader" OnValidSubmit="HandleCheckout">
                <DataAnnotationsValidator/>
                <div class="row">
                    <div class="col-md-6 mb-5 mb-md-0">
                        <h2 class="h3 mb-3 text-black">Billing Details</h2>
                        <div class="p-3 p-lg-5 border bg-white">
                            <div class="form-group row">
                                <div class="col-md-12">
                                    <label for="c_fname" class="text-black">First Name <span class="text-danger">*</span></label>
                                    <InputText @bind-Value="Order.OrderHeader.Name" type="text" class="form-control" id="c_fname" name="c_fname"/>
                                    <ValidationMessage For="() => Order.OrderHeader.Name"></ValidationMessage>
                                </div>
                            </div>
                            <div class="form-group row">
                                <div class="col-md-12">
                                    <label for="c_address" class="text-black">Address <span class="text-danger">*</span></label>
                                    <InputText @bind-Value="Order.OrderHeader.StreetAddress" type="text" class="form-control" id="c_address" name="c_address" placeholder="Street address"/>
                                    <ValidationMessage For="() => Order.OrderHeader.StreetAddress"></ValidationMessage>
                                </div>
                            </div>
                            <div class="form-group mt-3">
                                <label for="c_city" class="text-black">City <span class="text-danger">*</span></label>
                                <InputText @bind-Value="Order.OrderHeader.City" type="text" class="form-control" id="c_city" name="c_city" placeholder="City"/>
                                <ValidationMessage For="() => Order.OrderHeader.City"></ValidationMessage>
                            </div>
                            <div class="form-group row">
                                <div class="col-md-6">
                                    <label for="c_state_country" class="text-black">State / Country <span class="text-danger">*</span></label>
                                    <InputText @bind-Value="Order.OrderHeader.State" type="text" class="form-control" id="c_state_country" name="c_state_country"/>
                                    <ValidationMessage For="() => Order.OrderHeader.State"></ValidationMessage>
                                </div>
                                <div class="col-md-6">
                                    <label for="c_postal_zip" class="text-black">Posta / Zip <span class="text-danger">*</span></label>
                                    <InputText @bind-Value="Order.OrderHeader.PostalCode" type="text" class="form-control" id="c_postal_zip" name="c_postal_zip"/>
                                    <ValidationMessage For="() => Order.OrderHeader.PostalCode"></ValidationMessage>
                                </div>
                            </div>
                            <div class="form-group row mb-5">
                                <div class="col-md-6">
                                    <label for="c_email_address" class="text-black">Email Address <span class="text-danger">*</span></label>
                                    <InputText @bind-Value="Order.OrderHeader.Email" type="text" class="form-control" id="c_email_address" name="c_email_address"/>
                                    <ValidationMessage For="() => Order.OrderHeader.Email"></ValidationMessage>
                                </div>
                                <div class="col-md-6">
                                    <label for="c_phone" class="text-black">Phone <span class="text-danger">*</span></label>
                                    <InputText @bind-Value="Order.OrderHeader.PhoneNumber" type="text" class="form-control" id="c_phone" name="c_phone" placeholder="Phone Number"/>
                                    <ValidationMessage For="() => Order.OrderHeader.PhoneNumber"></ValidationMessage>
                                </div>
                            </div>
                        </div>
                    </div>
                    <div class="col-md-6">
                        <div class="row mb-5">
                            <div class="col-md-12">
                                <h2 class="h3 mb-3 text-black">Your Order</h2>
                                <div class="p-3 p-lg-5 border bg-white">
                                    <table class="table site-block-order-table mb-5">
                                        <thead>
                                        <th>Product</th>
                                        <th>Total</th>
                                        </thead>
                                        <tbody>
                                        @foreach (var prod in Order.OrderDetails)
                                        {
                                            <tr>
                                                <td>
                                                    @prod.ProductName <strong class="mx-2">x</strong> @prod.Count
                                                </td>
                                                <td>@prod.Price.ToString("c")</td>
                                            </tr>
                                        }
                                        <tr>
                                            <td class="text-black font-weight-bold">
                                                <strong>Cart Subtotal (Shipment)</strong>
                                            </td>
                                            <td class="text-black">@StandardDeliveryCharge.ToString("c")</td>
                                        </tr>
                                        <tr>
                                            <td class="text-black font-weight-bold">
                                                <strong>Order Total</strong>
                                            </td>
                                            <td class="text-black font-weight-bold">
                                                <strong>@((Order.OrderHeader.OrderTotal + @StandardDeliveryCharge).ToString("c"))</strong>
                                            </td>
                                        </tr>
                                        </tbody>
                                    </table>
                                    <label for="dropdownMenuButton1" class="payment">Payment Method</label>
                                    <div class="col-md-12">
                                        <div class="btn-group dropend mt-2">
                                            <button type="button" class="btn btn-secondary dropdown-toggle" data-bs-toggle="dropdown" aria-expanded="false" id="dropdownMenuButton1">
                                                @SelectedPayment
                                            </button>
                                            <ul class="dropdown-menu dropdown-menu-dark">
                                                <li>
                                                    <h5 class="dropdown-header">Available Payment Methods</h5>
                                                </li>
                                                <li>
                                                    <a class="dropdown-item" @onclick="@(() => SelectPaymentMethod("Stripe"))">Stripe Payment</a>
                                                </li>
                                                <li>
                                                    <hr class="dropdown-divider">
                                                </li>
                                                <li>
                                                    <a class="dropdown-item" @onclick="@(() => SelectPaymentMethod("Iyzico"))">Iyzipay Payment</a>
                                                </li>
                                            </ul>
                                        </div>
                                        <div class="form-group mt-5">
                                            <button class="btn btn-black btn-lg py-3 btn-block" type="submit">Place Order</button>
                                        </div>
                                    </div>
                                </div>
                            </div>
                        </div>
                    </div>
                </div>
            </EditForm>
            <!-- </form> -->
        </div>
    </div>
}
@code {
        
    private string checkout;
    private string SelectedPayment { get; set; } = "Stripe";
    
    private SuccessModelDTO result = new SuccessModelDTO()
    {
        StatusCode = 0
    };
    private async Task HandleCheckout()
    {
        if(SelectedPayment == "Stripe")
        {
            await StripePayment();
        }
        else if (SelectedPayment == "Iyzico")
        {
            await IyzicoPayment(Order);
        }
        
    }
    private async Task IyzicoPayment(OrderDTO order)
    {
        try
        {
            IsProcessing = true;
            var iyzicoPaymentDto = new IyzicoPaymentDTO()
            {
                Order = Order
            };
            
            result = await _paymentService.Checkout(iyzicoPaymentDto);
            if(result.StatusCode == 200)
            {
                
                checkout = result.Data.ToString();
               
                var orderDtoSaved = await _orderService.CreateForIyzico(iyzicoPaymentDto);
                await _localStorage.SetItemAsync(SD.Local_OrderDetails, orderDtoSaved);
                
                await _jsRuntime.InvokeVoidAsync("injectIyzicoScript", checkout);
            }
            
            IsProcessing = false;
        }
        catch (Exception e)
        {
            await _jsRuntime.ToastrError(e.Message);
        }
    }
   
}
Here is the javascript that I am trying to inject script:
function injectIyzicoScript(scriptContent) {
    const div = document.getElementById("iyzipay-checkout-form");
    if (div != null) {
        div.insertAdjacentHTML("beforeend", scriptContent);
    } else {
        console.error('Element with id "iyzipay-checkout-form" not found.');
    }
}

But I am getting Element with id "iyzipay-checkout-form" not found. on the browser console and there is no card info page displayed.

Here is the sample script content coming from 3rd party API that I am trying to inject into the HTML.

<script type="text/javascript">if (typeof iyziInit == 'undefined') {var iyziInit = {currency:"TRY",token:"dce6b28f-f7c6-45b0-af50-30473899f11f",price:1000.00,pwiPrice:1000.00,locale:"tr",baseUrl:"https://sandbox-api.iyzipay.com", merchantGatewayBaseUrl:"https://sandbox-merchantgw.iyzipay.com", registerCardEnabled:true,bkmEnabled:true,bankTransferEnabled:false,bankTransferTimeLimit:{"value":5,"type":"day"},bankTransferRedirectUrl:"http://localhost:7169/OrderConfirmation",bankTransferCustomUIProps:{},campaignEnabled:false,campaignMarketingUiDisplay:null,paymentSourceName:"",plusInstallmentResponseList:null,payWithIyzicoSingleTab:false,payWithIyzicoSingleTabV2:false,payWithIyzicoOneTab:false,newDesignEnabled:false,mixPaymentEnabled:true,creditCardEnabled:true,bankTransferAccounts:[],userCards:[],fundEnabled:true,memberCheckoutOtpData:{},force3Ds:false,isSandbox:true,storeNewCardEnabled:true,paymentWithNewCardEnabled:true,enabledApmTypes:["SOFORT","IDEAL","QIWI","GIROPAY"],payWithIyzicoUsed:false,payWithIyzicoEnabled:true,payWithIyzicoCustomUI:{},buyerName:"John",buyerSurname:"Doe",merchantInfo:"",merchantName:"Sandbox Merchant Name - 3397951",cancelUrl:"",buyerProtectionEnabled:false,hide3DS:false,gsmNumber:"",email:"email@email.com",checkConsumerDetail:{},subscriptionPaymentEnabled:false,ucsEnabled:false,fingerprintEnabled:false,payWithIyzicoFirstTab:false,creditEnabled:false,payWithIyzicoLead:false,goBackUrl:"",metadata : {},createTag:function(){var iyziJSTag = document.createElement('script');iyziJSTag.setAttribute('src','https://sandbox-static.iyzipay.com/checkoutform/v2/bundle.js?v=1719940949305');document.head.appendChild(iyziJSTag);}};iyziInit.createTag();}</script>

How can I do this?

Tiny Wang-MSFT 2,731 Microsoft Vendor

Hi Cenk, I tried your js code in my .Net 6 blazor wsam project which worked well. At least I can use that js method to inject html content into my app. I created a new blazor wsam project, then I changed the click button event handler to call js method, the js script was put in the index.html just behind the <script src="_framework/blazor.webassembly.js"></script>. Could you please help check with a hard code html content and see whether the inject operation worked or not?

@page "/counter"
@inject IJSRuntime _jsRuntime
<PageTitle>Counter</PageTitle>
<h1>Counter</h1>
<p role="status">Current count: @currentCount</p>
<button class="btn btn-primary" @onclick="IncrementCount">Click me</button>
<div id="iyzipay-checkout-form" class="responsive"></div>
@code {
    private int currentCount = 0;
    private async Task IncrementCount()
    {
        currentCount++;
        var checkout = $"<div>html content be injected</div>";
        await _jsRuntime.InvokeVoidAsync("injectIyzicoScript", checkout);
    }
}
<script src="_framework/blazor.webassembly.js"></script>
<script>
    window.injectIyzicoScript = (scriptContent) => {
        const div = document.getElementById("iyzipay-checkout-form");
        if (div != null) {
            div.insertAdjacentHTML("beforeend", scriptContent);
        } else {
            console.error('Element with id "iyzipay-checkout-form" not found.');
        }
    };
</script>

User's image

Cenk 1,021 Reputation points

2024-07-03T10:54:35.01+00:00

Hi Tiny Wang-MSFT,

Thank you for your time. Adding the js script under blazor.webassembly.js resolves the element with id not found problem but the 3rd party card info page did not display. And it adds js every time I click the button.
Cenk 1,021 Reputation points

2024-07-03T11:25:11.7966667+00:00
I think I need to call this js added with MarkupString somehow. Is it createTag or iyziInit? I couldn't figure it out.

<div id="iyzipay-checkout-form" class="responsive">@((MarkupString)checkout)</div>
Cenk 1,021 Reputation points

2024-07-03T17:25:36.0633333+00:00
I managed to display the card on the page, here is what I have done so far.

Changed the JS file

function injectScript(scriptContent) { var script = document.createElement('script'); const subject = document.querySelector("#iyzipay-checkout-form"); script.type = 'text/javascript'; script.innerHTML = scriptContent; subject.appendChild(script); }

Added MarkupString on razor

<div id="iyzipay-checkout-form" class="popup">@((MarkupString)checkout)</div>

Removing quotes

result = await _paymentService.Checkout(iyzicoPaymentDto);

Now the problem is after payment it does not call back to my Blazor WASM razor page since the 3rd party makes a POST request.
Tiny Wang-MSFT 2,731 Reputation points Microsoft Vendor

2024-07-04T01:55:13.7633333+00:00

Hi Cenk, thank you for coming back. In this scenario, we already solved the issue that we can't insert HTML content into blazor wsam app, the next shall be supported by the payment although it might not provide a good document support which causing us could only try by ourselves. Maybe what we are trying is not the correct approach? Per my understanding, we'd better to firstly double confirm whether we have a tutorial for it, then we might try to do the redirection and redirect back, because the normal payment tools look like all redirect to their own payment page then redirect back to the origin page or just offer a callback interface to allow the origin page to query whether the payment completed or not. I trust you also have similar experience for e-commerce, when we click to pay for something, a new tab openedand jumped to the payment tool, if this time we go back to the origin page, it might display "refresh if you already paid but this page doesn't auto refresh".

3 answers

Bruce (SqlWork.com) 66,226 Reputation points

2024-07-03T20:48:04.75+00:00

you will need a postback page in site hosting the Blazor WASM. it should render the Blazor host page, with the postback data serialized to a global javascript variable. on startup the Blazor app should use jsinterop to check for this data. if found it should also restore the saved state before redirecting to the payment application.
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Cenk 1,021 Reputation points

2024-07-04T06:28:35.18+00:00

This API action getting the response but I am not sure how to navigate to OrderConfirmation razor page on WASM?

[HttpPost] [AllowAnonymous] [ActionName("PaymentCallback")] public async Task<IActionResult> PaymentCallback([FromForm] string token) { var confirmationUrl = "http://localhost:7169/OrderConfirmation"; try { // Process the payment result var tokenValue = token; } catch (Exception ex) { return BadRequest(new { message = ex.Message }); } // Return the URL to the client return Ok(new { RedirectUrl = confirmationUrl }); }
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How to insert HTML to a Blazor WASM?

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