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? 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);
}
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