Giving instructions to the browser






Giving instructions to the browser

Next we need to tell the browser what to do when it gets a response from the server. Remember, the browser will run the function we tell it about every time the ready state changes.

    function getCustomerInfo() {
      var phone = document.getElementById("phone").value;
      var url = "lookupCustomer.php?phone=" + escape(phone);
      request.open("GET", url, true);
      request.onreadystatechange = updatePage;Here's the name of the function
that the browser should run whenever the ready state of the request object changes.
      request.send(null) 
;Be sure you set the onreadystatechange property before calling
send(), 
 so the browser knows what to do when it gets a response.
    }



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