Namespace jsf.ajax

Register a callback for error handling.

Usage:

jsf.ajax.addOnError(handleError);
...
var handleError = function handleError(data) {
...
}

Implementation Requirements:

This function must accept a reference to an existing JavaScript function. The JavaScript function reference must be added to a list of callbacks, making it possible to register more than one callback by invoking jsf.ajax.addOnError more than once. This function must throw an error if the callback argument is not a function.

Register a callback for event handling.

Usage:

jsf.ajax.addOnEvent(statusUpdate);
...
var statusUpdate = function statusUpdate(data) {
...
}

Implementation Requirements:

This function must accept a reference to an existing JavaScript function. The JavaScript function reference must be added to a list of callbacks, making it possible to register more than one callback by invoking jsf.ajax.addOnEvent more than once. This function must throw an error if the callback argument is not a function.

Send an asynchronous Ajax request to the server.

Usage:

Example showing all optional arguments:

<commandButton id="button1" value="submit"
    onclick="jsf.ajax.request(this,event,
      {execute:'button1',render:'status',onevent: handleEvent,onerror: handleError});return false;"/>
</commandButton/>

Implementation Requirements:

This function must:

• Be used within the context of a form.
• Capture the element that triggered this Ajax request (from the source argument, also known as the source element.
• If the source element is null or undefined throw an error.
• If the source argument is not a string or DOM element object, throw an error.
• If the source argument is a string, find the DOM element for that string identifier.
• If the DOM element could not be determined, throw an error.
• If the onerror and onevent arguments are set, they must be functions, or throw an error.
• Determine the source element's form element.
• Get the form view state by calling jsf.getViewState passing the form element as the argument.
• Collect post data arguments for the Ajax request.
  • The following name/value pairs are required post data arguments:

    name	value
    javax.faces.ViewState	Contents of javax.faces.ViewState hidden field. This is included when jsf.getViewState is used.
    javax.faces.partial.ajax	true
    javax.faces.source	The identifier of the element that triggered this request.

• Collect optional post data arguments for the Ajax request.
  • Determine additional arguments (if any) from the options argument. If options.execute exists:
    • If the keyword @none is present, do not create and send the post data argument javax.faces.partial.execute.
    • If the keyword @all is present, create the post data argument with the name javax.faces.partial.execute and the value @all.
    • Otherwise, there are specific identifiers that need to be sent. Create the post data argument with the name javax.faces.partial.execute and the value as a space delimited string of client identifiers.
  • If options.execute does not exist, create the post data argument with the name javax.faces.partial.execute and the value as the identifier of the element that caused this request.
  • If options.render exists:
    • If the keyword @none is present, do not create and send the post data argument javax.faces.partial.render.
    • If the keyword @all is present, create the post data argument with the name javax.faces.partial.render and the value @all.
    • Otherwise, there are specific identifiers that need to be sent. Create the post data argument with the name javax.faces.partial.render and the value as a space delimited string of client identifiers.
  • If options.render does not exist do not create and send the post data argument javax.faces.partial.render.
  • Determine additional arguments (if any) from the event argument. The following name/value pairs may be used from the event object:
    • target - the ID of the element that triggered the event.
    • captured - the ID of the element that captured the event.
    • type - the type of event (ex: onkeypress)
    • alt - true if ALT key was pressed.
    • ctrl - true if CTRL key was pressed.
    • shift - true if SHIFT key was pressed.
    • meta - true if META key was pressed.
    • right - true if right mouse button was pressed.
    • left - true if left mouse button was pressed.
    • keycode - the key code.
• Encode the set of post data arguments.
• Join the encoded view state with the encoded set of post data arguments to form the query string that will be sent to the server.
• Create a request context object and set the properties:
  • source (the source DOM element for this request)
  • onerror (the error handler for this request)
  • onevent (the event handler for this request)
  The request context will be used during error/event handling.
• Send a begin event following the procedure as outlined in the Chapter 13 "Sending Events" section of the spec prose document linked in the overview summary
• Set the request header with the name: Faces-Request and the value: partial/ajax.
• Determine the posting URL as follows: If the hidden field javax.faces.encodedURL is present in the submitting form, use its value as the posting URL. Otherwise, use the action property of the form element as the URL.
• Send the request as an asynchronous POST using the posting URL that was determined in the previous step.

Before the request is sent it must be put into a queue to ensure requests are sent in the same order as when they were initiated. The request callback function must examine the queue and determine the next request to be sent. The behavior of the request callback function must be as follows:

• If the request completed successfully invoke jsf.ajax.response passing the request object.
• If the request did not complete successfully, notify the client.
• Regardless of the outcome of the request (success or error) every request in the queue must be handled. Examine the status of each request in the queue starting from the request that has been in the queue the longest. If the status of the request is complete (readyState 4), dequeue the request (remove it from the queue). If the request has not been sent (readyState 0), send the request. Requests that are taken off the queue and sent should not be put back on the queue.

jsf.ajax.response(request, context);