AJAX Example

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Small Example

If we take a look at a small form with two items or components like this one:

Take interest that we did not put a SUBMIT on this form.

Also note that we added an onkeypress event to run a function. So each time a key is pressed inside the focus of the first form-text box we will run our function.


Now we will add in that function. It will first attempt to determine which browser a person has, so we know which version of the AJAX HTTP header object to use:



Now we need to detect when the HTTP header object used in AJAX changes. There are 5 states:

  • 0 – Not Initiaized Yet
  • 1 – Object Configured
  • 2 – Request Sent
  • 3 – Request in Progress
  • 4 – Request Complete



Now we can respond to new data from the server:



Next we need to send a request so we can process the response:



Now the only thing left is to write some server code (in test_ajax.php).
Since it only needs the data for field two, we will return a random number.

NOTE: This is PHP code which goes in a separate file from the HTML/JAVASCRIPT/AJAX file we were previously describing.

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