Hi --
There's been some traffic on this list involving XMLHttpRequests and
javascript, and since it's Friday ...
My problem: How to use multiple asynchronous requests simultaneously
without using the global namespace. For instance, I'd like to create a
little DirectoryTree widget that I can drop in pages like so:
<script type="text/javascript">
new DirectoryTree("some_directory_name");
</script>
Ideally, I could drop as many of these widgets on the page as I want.
Then I have some javascript like so:
DirectoryTree = function(directory, url) {
//setup
...
execute(url, DefaultCallback);
}
Here's an execute method that supposed to trigger some kind of action:
execute(url, callback) {
var cb = new callback();
cb.request = new XMLHttpRequest();
cb.request.onreadystatechange = callback.processResponse;
cb.request.open(this.METHOD, url, this.ASYNC);
cb.request.send(null);
}
DefaultCallback = function() {
this.request = null;
function processResponse() {
log.info("decorating: " + this.request);
}
}
The processResponse() method alerts: "decorating: undefined". I even
tried:
DefaultCallback = function() {
this.request = null;
}
DefaultCallback.processResponse = function() {
log.info("decorating: " + this.request);
}
and got the same result.
I'm somewhat experienced with Javascript and it's OO concepts and event
handling, but not terribly so. I think what's happening here is that on
readystate change triggers the creation of a new
'DefaultCallback.processResponse' object and therefore a new scope with
no concept of the 'var cb = new callback()' scope. Therefore, in order
to get at the xmlrequest/response, I need to go through the global
namespace or some other static-like namespace, which I don't really want
to do because I'd like to avoid managing, say a queue of xml http
requests. I haven't looked through the xml http request stuff that was
posted to struts sandbox (I think it's in sandbox, not really sure), but
does anyone have ideas on this one, or can point me to some code or info
with solution(s)?
- Dave
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