Is there a way for Google Translate (translate.google.com) to save user ratings without a postback? I've noticed similar seamless interactions on websites like Stack Overflow where users can vote on questions/answers or leave comments without any noticeable delays. Is this achieved through Ajax or simply JavaScript? It's such a smooth experience, and I'm curious about implementing these operations using VS2010, C#, ASP.NET.
Thanks!
There are two key points to consider:
In such cases, JavaScript code sends ajax requests to the server. The server processes these requests independently using various technologies of your choice. When a user clicks on a vote button, the JavaScript code immediately updates the visual display and subsequently sends an ajax request to record the vote on the server (resulting in instant feedback). If there is a problem with the request processing (e.g., HTTP error or server rejecting the vote), an error message is displayed, and the display reverts back to its original state.
For instance, Stack Exchange utilizes the jQuery library for their JavaScript functionalities. Here's an example of how simple an ajax call can be made using jQuery:
$.ajax({
url: "/path/to/server/resource",
method: "POST",
data: {action: "voteup"},
success: function(data) {
// Execute actions based on successful response from server
},
error: function(jqXHR, textStatus, errorThrown) {
// Handle errors that occur during the process
}
});
The server's response corresponds to the POST operation accordingly.
Although jQuery is commonly used for ajax calls, other JavaScript libraries like YUI, Closure, Prototype, among others, also simplify ajax operations. While jQuery remains highly popular for web-based JavaScript tasks, alternatives exist.
From an external perspective, it is likely that Stack Exchange employs various "comet" techniques (such as web sockets, long polling, hidden iframes, etc.) for passive updating.
Web sockets are probably the preferred option, allowing persistent bidirectional communication between clients and servers. Opening a question in Chrome with the Network tab reveals connections to
ws://sockets.ny.stackexchange.com/While web sockets enjoy decent support, older techniques may still be utilized by SE for compatibility on browsers lacking web socket support.
Personally, I found that switching from Entity Framework to Dapper was highly effective. The performance improvements were remarkable.
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