Re: [Jmol-users] Mac User Request and NIH site

[Robert H. <ha...@st...>]

On Wed, Aug 25, 2010 at 9:39 AM, Otis Rothenberger <osr...@ch...>wrote:

>  Bob,
>
> I didn't think of AJAX, probably because I'm at the low end of the learning
> curve on that. My server is limited to ASP.NET, but that should work with
> the approach you suggest.
>
> Am I correct on the following assumption? To use AJAX in place of the
> iFrame, I would have to write the NIH data to a temp text file on my server.
> Then AJAX could access that text file without a JavaScript security
> violation. Am I on the right track with this thought?
>
>
You just have your server return the file as part of a web call, just like
any "GET". The AJAX part is that you don't have to load that page into a
frame, you just use an asynchronous call. It's not really "xml" data -- just
HTML, but that's the name of the function that was developed back when they
THOUGHT it was going to be used for XML.


var req = null
var isMSIE = false

function loadXmlData(url, data, processor) {
    xmlProcessor = processor
    try {
        if (window.XMLHttpRequest) { // native XMLHttpRequest object
            req = new XMLHttpRequest();
        } else { // IE/Windows ActiveX version
            isMSIE = true
            req = new ActiveXObject("Microsoft.XMLHTTP");
        }
        req.onreadystatechange = processStateChange;
        req.open("POST", url + "?" + data, true);
        req.setRequestHeader('Content-Type',
'application/x-www-form-urlencoded; charset=UTF-8');
        req.send(data);
    } catch (e) {
        alert(e);
    }
}



function processStateChange() {
    if (req.readyState != 4)
        return
    if (req.status != 200) {
        alert(req.statusText);
        return
    }
   [do something with req.responseText]
}



Bob


> Other Questions: What I'm doing at present is reading the NIH data into a
> dynamic page that resides on my server. This dynamic page is loaded to the
> iFrame so that I can use the data. Can I use AJAX to read this dynamic page
> and bypass the iFrame? I should note that a call to the dynamic page must
> have the appropriate query string that triggers the appropriate NIH data
> read. I've used AJAX to read static files. Is the current problem that
> simple?
>
>
that simple.  Way easier.


> Otis
>
> Otis Rothenbergerchemagic.com
>
>
> On 8/25/2010 9:54 AM, Robert Hanson wrote:
>
> Otis, you can use an "applet proxy" -- that is, a stub of code on your web
> site that relays the data from another site, which is basically what you
> seem to be using.
>
> In addition, there is a JavaScript server at St. Olaf that allows you to
> read a page from anywhere in the world into the unsigned Jmol applet. You
> can use that. Check Jmol.js to see how that is used -- the unsigned applet
> can read from the American Mineralogist or RCSB this way. I don't advertise
> it because it's a browser version headache. The key for that is that it uses
> a JavaScript link.
>
> Actually, though, if you have access to your own site and php, you should
> use AJAX - that's what it's for. Get rid of the iframe!
>
> I'm trying to think of a good example where I have used that....
>
> Bob
>
>
> On Wed, Aug 25, 2010 at 12:21 AM, Otis Rothenberger <osr...@ch...
> > wrote:
>
>>
>> Otis
>>
>> --
>> Otis Rothenberger
>> chemagic.com
>>
>>
>
>
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-- 
Robert M. Hanson
Professor of Chemistry
St. Olaf College
1520 St. Olaf Ave.
Northfield, MN 55057
http://www.stolaf.edu/people/hansonr
phone: 507-786-3107


If nature does not answer first what we want,
it is better to take what answer we get.

-- Josiah Willard Gibbs, Lecture XXX, Monday, February 5, 1900