HTML SSE stands for HTML Server-Sent Events. It is a technology that allows a web page to receive updates from a server in real-time. This means that the server can push data to the web page without the need for the web page to constantly poll the server for updates. HTML SSE is a powerful tool for creating dynamic web applications that require real-time updates.
Brief Explanation of HTML SSE
HTML SSE is a part of the HTML5 specification. It is a simple and efficient way to send updates from a server to a web page. The technology works by establishing a persistent connection between the web page and the server. The server can then send updates to the web page as they occur.
HTML SSE is different from other real-time web technologies, such as WebSockets, in that it uses a unidirectional connection. This means that data can only be sent from the server to the web page, not the other way around. However, this makes HTML SSE more lightweight and easier to implement than other real-time web technologies.
Code Examples in <pre> Tags
To use HTML SSE, you need to create an EventSource object in JavaScript. This object is used to establish the connection between the web page and the server. Here is an example of how to create an EventSource object:
var source = new EventSource('server.php');
In this example, 'server.php' is the URL of the server-side script that will send updates to the web page.
Once the EventSource object is created, you can listen for updates using the 'onmessage' event. Here is an example of how to listen for updates:
source.onmessage = function(event) {
var data = event.data;
// Do something with the data
};
In this example, the 'onmessage' event is triggered whenever the server sends an update. The 'event.data' property contains the data sent by the server.
You can also listen for other events, such as 'onopen' and 'onerror'. The 'onopen' event is triggered when the connection is established, and the 'onerror' event is triggered if there is an error with the connection. Here is an example of how to listen for these events:
source.onopen = function(event) {
// Connection is established
};
source.onerror = function(event) {
// There was an error with the connection
};
Conclusion
HTML SSE is a powerful technology for creating real-time web applications. It allows a web page to receive updates from a server in real-time, without the need for constant polling. HTML SSE is lightweight and easy to implement, making it a great choice for many web applications.
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