Updating web page without refreshing

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Updating web page without refreshing


We can do this using the Ajax techniques above, so that the rest of the screen remains responsive. When a browser makes a request using XMLHttpRequest it provides the name of a Javascript function that will be called back by the server. Also this is clearly a more complex solution to implement than normal short polling. The server may eventually time out the connection, or may keep it open indefinitely. A number of commercial frameworks have been built using these techniques. HTML hypertext markup language , of course, is a simple markup language that tells a browser where to put text and images on a web page using tags e. So a very simple approach is to automatically request a refresh of the part of the screen we are interested in updating periodically. Polling Javascript allows us to fire events that run code in the browser at set intervals. One disadvantage of this approach is that it can lead to security vulnerabilities in the code. Streaming In streaming the client makes a request and the server responds with an open response that keeps the communication channel open and allows subsequent responses to be sent to the client. Furthermore, the returned text can contain additional links that the browser will show underlined and that I can click on. If the connection times out the client will have to make another request to refresh the data. Another obvious drawback is that this is a fairly complex way of keeping data up to date. Initially this could be initiated by the user clicking a button, but we want just the relevant data to update, not the entire page. The main drawback of this new technology currently is that many browsers do not support it. The browser handles the request and immediately sets up another long timeout request for future updates. Often web servers will simply store the text in text files on their hard drive, and just load and send the right one in response to a request depending on the text of the request. One drawback of this approach is that many proxy servers buffer http responses until they are complete: The user can carry on interacting with the page as usual, even if the call to the server takes some time. Script Injection Another approach to refreshing part of a web page is client-side script injection. Refreshing Part of a Web Page The first problem that developers tried to solve was updating part of a web page in place without reloading the entire page. Here the browser fires off a request with a long timeout and sets up a handler for the results using Ajax as before. The ability to update the page when data changes on the server without the user having to refresh in any way. This function will have access to the data sent back from the server. Search engines can get confused by them. So this approach is like long polling with the client needing to make fewer requests.

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Updating web page without refreshing

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PHP/AJAX Submit form without refreshing it




One advantage of this approach is that script tags can issue requests to any URL, not just the same site as the page they are on. The ability to update the page when data changes on the server without the user having to refresh in any way. This takes advantage of the fact that Javascript code in a web page can be retrieved from a server using a URL via a src tag. Polling Javascript allows us to fire events that run code in the browser at set intervals. Furthermore, the returned text can contain additional links that the browser will show underlined and that I can click on. So a very simple approach is to automatically request a refresh of the part of the screen we are interested in updating periodically. One is to use IFrames. With all of these approaches the call backs from the server tend to tie up one http communication channel. The ability to refresh part of a web page without reloading the entire page. HTML hypertext markup language , of course, is a simple markup language that tells a browser where to put text and images on a web page using tags e.

Updating web page without refreshing


We can do this using the Ajax techniques above, so that the rest of the screen remains responsive. When a browser makes a request using XMLHttpRequest it provides the name of a Javascript function that will be called back by the server. Also this is clearly a more complex solution to implement than normal short polling. The server may eventually time out the connection, or may keep it open indefinitely. A number of commercial frameworks have been built using these techniques. HTML hypertext markup language , of course, is a simple markup language that tells a browser where to put text and images on a web page using tags e. So a very simple approach is to automatically request a refresh of the part of the screen we are interested in updating periodically. Polling Javascript allows us to fire events that run code in the browser at set intervals. One disadvantage of this approach is that it can lead to security vulnerabilities in the code. Streaming In streaming the client makes a request and the server responds with an open response that keeps the communication channel open and allows subsequent responses to be sent to the client. Furthermore, the returned text can contain additional links that the browser will show underlined and that I can click on. If the connection times out the client will have to make another request to refresh the data. Another obvious drawback is that this is a fairly complex way of keeping data up to date. Initially this could be initiated by the user clicking a button, but we want just the relevant data to update, not the entire page. The main drawback of this new technology currently is that many browsers do not support it. The browser handles the request and immediately sets up another long timeout request for future updates. Often web servers will simply store the text in text files on their hard drive, and just load and send the right one in response to a request depending on the text of the request. One drawback of this approach is that many proxy servers buffer http responses until they are complete: The user can carry on interacting with the page as usual, even if the call to the server takes some time. Script Injection Another approach to refreshing part of a web page is client-side script injection. Refreshing Part of a Web Page The first problem that developers tried to solve was updating part of a web page in place without reloading the entire page. Here the browser fires off a request with a long timeout and sets up a handler for the results using Ajax as before. The ability to update the page when data changes on the server without the user having to refresh in any way. This function will have access to the data sent back from the server. Search engines can get confused by them. So this approach is like long polling with the client needing to make fewer requests.

Updating web page without refreshing


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4 thoughts on “Updating web page without refreshing

  1. Initially this could be initiated by the user clicking a button, but we want just the relevant data to update, not the entire page. Polling Javascript allows us to fire events that run code in the browser at set intervals.

  2. This obviously puts load on the server and the number of sockets that the server can possibly use becomes a limiting factor. The ability to update the page when data changes on the server without the user having to refresh in any way.

  3. HTML hypertext markup language , of course, is a simple markup language that tells a browser where to put text and images on a web page using tags e.

  4. One drawback of this approach is that many proxy servers buffer http responses until they are complete:

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