Максим Барбул :
My page is actually a CGI/Perl script that generates the XML obtained
from a MySQL query. However, any code pertaining to the Google API
(aka any Javascript) is called within my cgi file via "print qq|
<javascript goes here> |;". How would you recommend for me to thread
such data?
Ray Cromwell:
How would you suggest using setTimeout() intelligently within the
processing of the XML file?
function loadXML() {
var request = GXmlHttp.create();
request.open("GET", fileName, true);
request.onreadystatechange = function() {
if(request.readyState == 4) {
var xml = GXml.parse(request.responseText);
idD = xml.documentElement.getElementsByTagName
("data_id");
piD = xml.documentElement.getElementsByTagName("pi");
ciD = xml.documentElement.getElementsByTagName
("cruise");
dtD = xml.documentElement.getElementsByTagName
("date_time");
latD = xml.documentElement.getElementsByTagName
("latitude");
lonD = xml.documentElement.getElementsByTagName
("longitude");
depD = xml.documentElement.getElementsByTagName
("depth");
nameD = xml.documentElement.getElementsByTagName
("name");
valD = xml.documentElement.getElementsByTagName
("value");
initialize();
}
}
request.send(null);
}
Also, can you perhaps point me to some more information about JSON. I
would love to have a much more efficient page as this is data that I
am trying to give to the scientific community.
I had a chance to look at your product and your screencast. Perhaps a
bit more information about that? Feel free to e-mail me.
------------
Thanks to you both for your answers.
Best,
Dan
On Feb 12, 2:38 pm, Ray Cromwell <[email protected]> wrote:
> You can use setTimeout() to process the XML in chunks, however, I
> would recommend using JSON or emitting script from the server, it will
> be much more efficient. Basically, you can avoid the slow script
> warning by yielding the CPU after processing a certain number of rows
> via setTimeout(). However, you will still face the issue that overall
> page load and startup will be slow.
>
> It also depends on the visualization you plan to use. Most charts
> won't even render more than a few hundred datapoints without choking.
> Chronoscope/Timescope (http://timefire.com) is a highly specialized
> chart specifically engineered to scale to millions of points.
>
> -Ray
>
> On Thu, Feb 12, 2009 at 11:33 AM, Максим Барбул <[email protected]> wrote:
> > Hi, I think you'll have problems in displaying such big data store.
> > Try to split into pages or through out some points. You can threat such data
> > with PHP, PERL, C, Java, ... but NOT JavaScript.
>
> > 2009/2/12 p00kie <[email protected]>
>
> >> Hi all,
>
> >> I am looking for a way to load a large xml file into a dataTable.
>
> >> I am using XMLHttpRequest to load the XML file.
>
> >> My table has 8 columns and about 300,000 rows. When I try to load it,
> >> I will usually get a non-responsive script error.
>
> > --
> > С уважением,
> > Максим Барбул
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