Cookies are knowledge stored by the web browser, as easy as that. you'll be able to save something; yes I said anything, in cookies. I will conjointly do that through Silverlight itself, except for fun let's attempt doing it with JavaScript Silverlight 6. With this method we tend to follow, we'll be accessing JavaScript's function from Silverlight. This sometime becomes a headache for many developers.
The first step towards setting cookies through JavaScript, is to call the JavaScript function from Silverlight. Calling a JavaScript function from Silverlight is extremely straightforward. to know this, and more forthcoming things, produce a brand new Silverlight application "JavaScriptTweaks". Open JavaScriptTweaksTestpage.aspx, and add the subsequent code somewhere with <head> tag:
<script type="text/javascript">
function SayHello()
{
alert("Hello!");
}
</script>
Next step in the mainpage.cs inside the constructor add the code below:
HtmlPage.Window.Invoke("SayHello");
When you run the application, what you will see is a message box that pops up saying Hello at the very beginning of the app.
Now, we want to Setting the Cooking. Remove the SayHello function from the JavaScript. Write the following code:
function SetCookie(cookieName, cookieValue, Days)
{
var todayDate = new Date();
var expireDate = new Date();
if (Days == null || Days == 0) Days = 1;
expire.setTime(todayDate.getTime() + 3600000 * 24 * Days);
document.cookie = cookieName + ":" + cookieValue
+ ";expires=" + expireDate.toGMTString();
}
Next step, call the function SetCookie with this code:
HtmlPage.Window.Invoke("SetCookie", "Name", "Peter", 5);
On the code above will call SetCookie function with the parameters cookieName "Name", cookieValue "Peter" and validity, in other words Days as "5". Line #5 of the function will set the expiry time period of cookies, which is in milliseconds and is about 432000000 for 5 days. Line #6 of the function will set the cookie's information like, its Name, Value and Expiry date. Our cookie is set to give information.
Now, we want to retrieve the information. Create three buttons in the XAML of the main page, 1 for each setcookie, getcookie and deletecookie.
Copy the function on the main page to the click event of the SetCookie Button. And here is the code that I used:
function GetCookie(cookieName)
{
var allcookies = document.cookie;
// Get all the cookies in an array
var cookiearray = allcookies.split(';');
for (var i = 0; i < cookiearray.length; i++)
{
var nameOfCookie = cookiearray[i].split('=')[0];
if (cookieName == nameOfCookie)
{
return cookiearray[i];
}
}
return null;
}
Pass in the cookie name (which in our case is "Name") & the function can return the entire cookie. On the GetCookie button select event and we should call this function. Write the following code:
private void ButtonGet_OnClick(object sender, RoutedEventArgs e)
{
var cookie = HtmlPage.Window.Invoke("GetCookie", "Name");
if (cookie == null)
{
MessageBox.Show("No cookie found");
return;
}
MessageBox.Show(cookie.ToString().Split('=').LastOrDefault());
}
This will pop up a message box, showing the value of the cookie specified. Since I have my cookie as "name=Peter" it shows me "Peter".
Finally we want delete a cookie. You need to set the expiry date to a previous date. That can be done thorugh JavaScript's function as follows:
function DeleteCookie(cookieName)
{
var exp = new Date();
exp.setTime(exp.getTime() - 1);
document.cookie = cookieName + "=;expires=" + exp.toGMTString();
}
In the delete button click event call this function as:
private void ButtonDelete_OnClick(object sender, RoutedEventArgs e)
{
HtmlPage.Window.Invoke("DeleteCookie", "Name");
}
Pass within the name of the cookie you wish to delete and bang! it'll be deleted. currently simply do this. Click on SetCookie, it'll set the cookie for you. now click on GetCookie to verify whether or not it did set a cookie or not, you ought to see the value of the cookie within the message box. Click on Deletecookie to delete the cookie. Finally click on Getcookie button once more, if everything worked fine then you ought to see a message within the message box saying: "No cookie found".
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