Using Coldfusion To Use Javascript.

Sep 26, 2006

I have a web based application for my company. We use Coldfusion, I
wanted to see if I could use Javascript to make the page a bit more
dynamic.

Right now I use the command:
<cfhttp URL="http://server:port" method="get" Timeout="20" charset="UTF-8">
<cfhttpparam name="var" type="CGI" value="command I send">

this connects to an application on another server listening on the
provided port for a request. When it sees the command a parser
reads the command and formats an XML file that is returned to the web
page. I can parse the XML and use it to fill out the page.

I've read about using "ActiveXObject(Microsoft.XMLHTTP)" and
onreadystatechange to dynamically update a web page.

I would like to send the Coldfusion command, or it's Javascript equivalent
to update the page. Say if you need to change an address,
you could submit the change and just the address would be updated on the
page, so it isn't necessary for the remote server to return the entire
account information again.

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I have date fields on a form which is generated by a Coldfusion custom
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form when the user changes the date. But, how do I generate an
onChange() event on this field (since I only have the call to the
custom tag in this form)?

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I'm using jQuery $.ajax or $.getJSON on document.ready to access data from the server through coldfusion remote cfc files.

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When i go to a new page i.e. [url]

The ajax functions are called but are not collecting new data (only in IE). IE caches the response and wont give me a new one unless I refresh the page, which I don't want to do.

Here's an example of a function I call. I've also tried $.getJSON with no success.

function getGrains() {

I've looked into ways to make sure IE wont cache files. Some of the popular suggestions are:

Add a random parameter to the url: I've done this:

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Also, jQuery's cache:false doesn't work.

I'm not sure I can use the meta tags or header cache-control functions because it's not caching my html page, it just caches these HTTPRequests from within my javascript file, and they're not loading html, just json objects.

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[Code]...

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Jul 23, 2005

I'm working on some code and am running into brick walls. I'm trying
to write out Javascript with Javascript and I've read the clj Meta FAQ
and didn't see the answer, read many similar posts (with no luck
though), and searched through the IRT.ORG Faqs
(www.irt.org/script/script.htm).

The Javascript is designed to open an popup window and then inside that
window call another script which will resize that window. There may be
another way around this but the reason I tried this approach initially
was that I wanted to call the onload handler in the popup window to
resize the image only after the image had completely loaded. I've had
some code in the primary Javascript file (showimage.js) before that
works if the image has been cached but on the first load, it doesn't
resize properly which tells me it is probably because it is trying to
resize the window based on the image size but it isn't completely known
at that point. So I removed that code and tried placing the resizing
code in the second Javascript file (resizewindow.js). BTW I've tried
other code to open a popup image and automatically size it ie Q1443 at
irt.org but that doesn't do exactly what we need.

Even if there is another way to do this with one file, I still want to
figure out why this isn't working in case I run into it in the future.

I thought what I would need to do to use document.writeln to write
Javascript would be to escape any special characters and to break
apart the script tag ie

document.writeln('</SCRIPT>');

would become

document.writeln('</SCR' + 'IPT>');

I have a HTML page and 2 Javascript files. All files are in the same
directory and have permissions set correctly.

Here are the 3 files (keep in mind wordwrap has jacked up the
formatting):

index.html
----------
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Test</title>
<SCRIPT type="text/javascript" LANGUAGE="JavaScript1.1"
SRC="showimage.js">
</SCRIPT>
</head>

<body>
Click the house<BR>
<A ONCLICK="newWindow1('house1.jpg','Nice House')"><IMG
SRC="house1thumb.jpg"></A>
</body>
</html>


showimage.js
------------
function newWindow1(pic,sitename)
{

picWindow=window.open('','','width=25,height=25,sc rollbars=1,resizable=1');
picWindow.document.writeln('<html> <head>');
picWindow.document.writeln('<SCR' + 'IPT type="text/javascript"
LANGUAGE="JavaScript1.1" SRC="resizewindow.js"></SCR' + 'IPT>');
picWindow.document.writeln('</head>');
picWindow.document.writeln('<body onload="resizewindow();">');
picWindow.document.writeln('<img src=' + pic + '>');
picWindow.document.writeln('</body> </html>');
picWindow.document.close();
}

resizewindow.js
---------------
function resizewindow()
{
// Do resizing here.
// Right now this isn't being executed
alert("resizing window");
}


Can anyone provide some pointers as to why this javascript is failing?
I'm using IE6 on Win2k and when I click on the image to open the popup
window, it does open the window but it is white with no content and the
system immediately goes from about 4% CPU usage to 100% and
consistently stays there until I kill that window with the task
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What is interseting is the ROW that already exists has a similar
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The error is: Error: theFrame has no properties
Line: 8

The line that the javascript console is showing an error for is in italics.

code from page:

<html>
<head>
<script type="text/javascript">
var defaultCols="100px,*";
var hiddenCols="0px,*";
function ShowHideMenu(){
theFrame = document.getElementById("framed");
if(theFrame.cols == defaultCols) theFrame.cols=hiddenCols;
else theFrame.cols=defaultCols;
}
</script>
<frameset cols="100px,*" name="framed">
<frame src="lframe.htm" name="frameMenu">
<frame src="mframe.htm" name="content">
</frameset>
</head>
<body>
</body></html>

Come someone let me know what I'm doing wrong here?

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and by the way, i've read the sample chapter 5 of Sitepoint's book, and it seems like the author(s) just put the solutions/codes there and let you figure them out on your own. Is this how the rest of the chapters are?

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Why?
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Example code...

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