How to create a cookie client side using blazor

How to create a cookie client side using blazor

In Blazor, you can create a cookie client-side using the jsRuntime service to call JavaScript code that creates and sets the cookie. Here's an example:

  • First, inject the IJSRuntime service into your Blazor component:
@inject IJSRuntime jsRuntime
  • Next, define a method in your component that calls JavaScript code to create and set the cookie:
private async Task SetCookieAsync(string name, string value, int expires) { await jsRuntime.InvokeVoidAsync("setCookie", name, value, expires); }

In this example, the SetCookieAsync method takes three parameters:

  • name: The name of the cookie.
  • value: The value of the cookie.
  • expires: The number of days until the cookie expires.

The method uses the jsRuntime.InvokeVoidAsync method to call a JavaScript function named setCookie, passing in the name, value, and expires parameters.

  • Finally, define the setCookie JavaScript function in a script tag in your component's Razor file:
<script> function setCookie(name, value, expires) { var date = new Date(); date.setTime(date.getTime() + (expires * 24 * 60 * 60 * 1000)); var expiresStr = "expires=" + date.toUTCString(); document.cookie = name + "=" + value + ";" + expiresStr + ";path=/"; } </script>

In this example, the setCookie function takes three parameters:

  • name: The name of the cookie.
  • value: The value of the cookie.
  • expires: The number of days until the cookie expires.

The function creates a Date object representing the expiration date of the cookie, and sets the cookie's expiration date using the expires parameter. It then sets the document.cookie property to a string containing the cookie name, value, and expiration date.

You can then call the SetCookieAsync method from your component's code to create and set a cookie. For example:

await SetCookieAsync("myCookie", "myValue", 7);

This will create a cookie named "myCookie" with a value of "myValue" that expires in 7 days.

Examples

  1. "Blazor set cookie client-side"

    • Code:
      @code { [Inject] IJSRuntime JSRuntime { get; set; } async Task SetCookieAsync() { await JSRuntime.InvokeVoidAsync("document.cookie", "yourCookieName=yourCookieValue; expires=Thu, 18 Dec 2023 12:00:00 UTC; path=/;"); } }
    • Description: Uses JavaScript interop to set a cookie with a specified name, value, expiration date, and path.

  2. "Blazor read cookie client-side"

    • Code:
      @code { [Inject] IJSRuntime JSRuntime { get; set; } async Task<string> ReadCookieAsync() { return await JSRuntime.InvokeAsync<string>("document.cookie"); } }
    • Description: Utilizes JavaScript interop to read the entire cookie string from the client-side.

  3. "Blazor delete cookie client-side"

    • Code:
      @code { [Inject] IJSRuntime JSRuntime { get; set; } async Task DeleteCookieAsync() { await JSRuntime.InvokeVoidAsync("document.cookie", "yourCookieName=; expires=Thu, 01 Jan 1970 00:00:00 UTC; path=/;"); } }
    • Description: Invokes JavaScript to delete a cookie by setting its expiration date to a past date.

  4. "Blazor create persistent cookie client-side"

    • Code:
      @code { [Inject] IJSRuntime JSRuntime { get; set; } async Task SetPersistentCookieAsync() { await JSRuntime.InvokeVoidAsync("document.cookie", "yourPersistentCookieName=yourCookieValue; max-age=31536000; path=/;"); } }
    • Description: Uses JavaScript interop to set a persistent cookie with a specified max-age (in seconds).

  5. "Blazor check if cookie exists client-side"

    • Code:
      @code { [Inject] IJSRuntime JSRuntime { get; set; } async Task<bool> DoesCookieExistAsync(string cookieName) { var cookies = await JSRuntime.InvokeAsync<string>("document.cookie"); return cookies.Contains(cookieName); } }
    • Description: Reads the entire cookie string and checks if the specified cookie name exists.

  6. "Blazor update cookie client-side"

    • Code:
      @code { [Inject] IJSRuntime JSRuntime { get; set; } async Task UpdateCookieAsync(string updatedValue) { await JSRuntime.InvokeVoidAsync("document.cookie", "yourCookieName=" + updatedValue + "; path=/;"); } }
    • Description: Invokes JavaScript to update the value of an existing cookie.

  7. "Blazor secure cookie client-side"

    • Code:
      @code { [Inject] IJSRuntime JSRuntime { get; set; } async Task SetSecureCookieAsync() { await JSRuntime.InvokeVoidAsync("document.cookie", "yourSecureCookieName=yourSecureCookieValue; Secure; path=/;"); } }
    • Description: Uses JavaScript interop to set a secure cookie with the "Secure" attribute.

  8. "Blazor HttpOnly cookie client-side"

    • Code:
      @code { [Inject] IJSRuntime JSRuntime { get; set; } async Task SetHttpOnlyCookieAsync() { await JSRuntime.InvokeVoidAsync("document.cookie", "yourHttpOnlyCookieName=yourCookieValue; HttpOnly; path=/;"); } }
    • Description: Invokes JavaScript to set an HttpOnly cookie with the "HttpOnly" attribute.

  9. "Blazor cookie domain and path client-side"

    • Code:
      @code { [Inject] IJSRuntime JSRuntime { get; set; } async Task SetCookieWithDomainAndPathAsync() { await JSRuntime.InvokeVoidAsync("document.cookie", "yourCookieName=yourCookieValue; domain=yourdomain.com; path=/yourpath;"); } }
    • Description: Sets a cookie with a specified domain and path using JavaScript interop.

  10. "Blazor cookie expiration client-side"

    • Code:
      @code { [Inject] IJSRuntime JSRuntime { get; set; } async Task SetCookieWithExpirationAsync(DateTime expirationDate) { var formattedDate = expirationDate.ToUniversalTime().ToString("R"); await JSRuntime.InvokeVoidAsync("document.cookie", $"yourCookieName=yourCookieValue; expires={formattedDate}; path=/;"); } }
    • Description: Sets a cookie with a specified expiration date using JavaScript interop.

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