On Jan 13, 2009, at 9:35 PM, John Ours wrote:
On Jan 14, 2009, at 12:11 AM, Chuck Hill wrote:
On Jan 12, 2009, at 7:24 AM, John Ours wrote:
Hi All,
Quick question about the Ajax Slider component in Wonder. What is
the rationale behind the OnChangeServer binding? The behavior
seems to be that if the binding is set - regardless of its value -
an ajax post occurs to set the value. A quick peek at the source
confirms that's what's going on...and the value of the binding is
being ignored. Was this the intended behavior and I'm missing
something? Or would this binding be better expressed as a boolean?
The binding is supposed to return a JavaScript snippet to be run in
the browser after the slider changes.
Thanks Chuck. How does OnChangeServer differ from OnChange then?
onChange is static JavaScript, it does not make a trip to the server.
onChangeServer sends the current slider position/value back to the
server and has the application dynamically generate the JavaScript to
return to and execute on the client.
In the SliderExample from the Wonder project, they use OnChange and
OnSlide for the client javascript, like this:
AjaxSlider1: AjaxSlider {
orientation = "horizontal";
value = 10;
minimum = 0;
maximum = 10;
onSlide = "function(v) {$('value').innerHTML = v}";
onChange = "function(v) {$('value').innerHTML = v}";
}
In particular I'm curious about this piece of code (and a similar
one for onSlideServer) from AjaxSlider.java:
if(hasBinding("onChangeServer")) {
String parent = (String) valueForBinding("onChange");
options.setObjectForKey("function(v) {new Ajax.Request('"+
AjaxUtils.ajaxComponentActionUrl(context())
+"', {parameters: '"+context().elementID()+"=' + v +
'&ajaxSlideTrigger=onChange'})"
+(parent != null ? "; var parentFunction = " + parent + ";
parentFunction(v);" : "")
+"}", "onChange");
} else {
new AjaxOption("onChange",
AjaxOption.SCRIPT).addToDictionary(this, options);
}
Does that code make more sense with the above explanation?
Chuck
--
Chuck Hill Senior Consultant / VP Development
Practical WebObjects - for developers who want to increase their
overall knowledge of WebObjects or who are trying to solve specific
problems.
http://www.global-village.net/products/practical_webobjects
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