How do you get the current date and time from client in Blazor WebAssembly?
To get the current data and time from client, use the date object (new Date()) in JavaScript using JavaScript Interop. It will return the browser’s date and time. Following is the code to get the current date and time from the client in Blazor WebAssembly. [Index.razor] [index.html] View Sample in GitHub
How do I implement Google reCaptcha in a Blazor WebAssembly application?
Google reCaptcha is a process that helps to protect websites form spam and abuse. To implement Google reCaptcha in Blazor, refer to the Google reCaptcha script link the WebAssembly app and render the reCaptcha by calling the JavaScript function.Follow these steps to implement Google reCaptcha in Blazor WebAssembly. Add the Google reCaptcha renderer function in a separate JavaScript file under the wwwroot folder.[googlereCaptcha.js] function googleRecaptcha(dotNetObject, selector, sitekeyValue) { return grecaptcha.render(selector, { ‘sitekey’: sitekeyValue, ‘callback’: (response) => { dotNetObject.invokeMethodAsync(‘CallbackOnSuccess’, response); }, ‘expired-callback’: () => { dotNetObject.invokeMethodAsync(‘CallbackOnExpired’, response); } }); }; function getResponse(response) { return grecaptcha.getResponse(response); } Add the reCaptcha script link and reference the reCaptcha.js file source in index.html.[index.html] <body> . . . . . . <script src=”googlereCaptcha.js”></script> <!– reCaptcha rendering script –> <script src=”https://www.google.com/recaptcha/api.js”></script></body > Now call the rendering reCaptcha function in JavaScript from the Razor page using JavaScript Interop and show the reCaptcha response on button click.Note: To start using reCaptcha, you need to generate the API site key for your site. Refer to this link to generate the site key. [Index.razor] @page “/” @inject IJSRuntime JSRuntime @using System.ComponentModel <h3>Google reCAPTCHA</h3> <div id=”google_recaptcha “></div> <button class=”btn btn-primary” @onclick=”ShowResponse”>Show Response</button> <br /> <p>@captchaResponse</p> @code { private string captchaResponse; protected override async Task OnAfterRenderAsync(bool firstRender) { if (firstRender) { await JSRuntime.InvokeAsync<int>(“googleRecaptcha”, DotNetObjectReference.Create(this), “google_recaptcha “, “your-sitekey”); } await base.OnAfterRenderAsync(firstRender); } [JSInvokable, EditorBrowsable(EditorBrowsableState.Never)] public void CallbackOnSuccess(string response) { captchaResponse = response; } [JSInvokable, EditorBrowsable(EditorBrowsableState.Never)] public void CallbackOnExpired(string response) { //… } private void ShowResponse() { captchaResponse = $”The response for the Google reCAPTCHA widget: {captchaResponse}”; } }
How do I call a JavaScript method with parameters in Blazor WebAssembly?
You can call a JavaScript function with parameters using JavaScript Interop. Syntax: To call a JavaScript method with parameters in Blazor WebAssembly, you can follow the code snippet provided below: [Index.razor] [index.html] Refer to this documentation for more information. View Sample in GitHub
How do you close the browser window from a page in Blazor WebAssembly?
Close a browser window from a page in Blazor WebAssembly using JavaScript Interop with the window.close() method. The window.close() method closes the currently opened window. In the following example, open a new browser window and close it using the window.close() method with a button onclick event. [Index.razor]
How do I read a JSON file in Blazor WebAssembly?
To read a JSON file in Blazor WebAssembly, you can utilize the HttpClient class along with the GetFromJsonAsync() method. Follow these steps to achieve that: To proceed, create or load a JSON file in the wwwroot folder. As an example, I have created a basic employee.json file and will read its values within a Razor component. [wwwroot/employee.json] [Index.razor] Refer to this documentation for more details.