[Xerte-dev] Re: Reading url parameters in Xerte via javascript - strange behaviour in IE8

[Dave Burnett]

Don't know if this will help narrow it, but I suspect the issue is here:
var type = typeof(value);
.........} else {
return "<null/>"; //???
}

IOW, at some point an unrecognizable type is being passed into that function, and the "else" says return null. 
Date: Thu, 19 Apr 2012 12:20:30 +0100
From: johnathan.kemp at ntlworld.com
To: xerte-dev at lists.nottingham.ac.uk
Subject: [Xerte-dev] Re: Reading url parameters in Xerte via javascript - strange behaviour in IE8

This is driving me crazy,

I have a working version using Xerte desktop and this error in toolkits.
I noticed that there were discrepancies between the dates of the files for the xerte desktop swfs and the toolkits swfs so I swapped in the swfs one by one from the desktop. Still no change.

So I set to create a common code block that I could use in both the desktop and toolkits pages.rlo and Nottingham.rlt file, effectively using all the same code except for the looking up of the returned url parameter as tookits and xerte use different arrays. ( extXML.firstChild.childNodes v rootIcon.pages). 
Crucially they would be both using exactly the same code to capture the url parameter and to display it in an alert box afterwards.
I got this working in the desktop project but when I copied the code block over to Nottingham.rlt it killed my Xampp toolkits sites ability to preview or run projects I just get loading xml. This even occurs when I replace the Nottingham.rlt with the original which I had backed up.

I suspect there may be issues with the different versions of the various swfs but cannot confirm this since my Toolkits site is now stuffed.
I don't have time to look at this further now, but may get some time over the weekend.

Do you know if there is a version of Xampp that has all the latest support files that will be part of the next release? 
If there isn't is it simply a case of replacing all the files in the xampp htdocs toolkits folder with the folders in the root of the XOT svn?

Will this cause issues with the databases?
Are the various support files e.g. the various swfs in the XOT svn updated in line with any changes in the desktop version?

Kind regards
Johnathan
On 19 April 2012 11:09, Julian Tenney <Julian.Tenney at nottingham.ac.uk> wrote:

I’m not sure, but this doesn’t make sense:
 try { __flash__toXML(alert("destinationPage = null")) ; } catch (e) { "<undefined/>"; }
 because earlier in the code you pass a string to toXML(), here you / something is passing the alert function.
  
From: xerte-dev-bounces at lists.nottingham.ac.uk [mailto:xerte-dev-bounces at lists.nottingham.ac.uk] On Behalf Of Kemp Johnathan

Sent: 18 April 2012 22:24
To: Xerte Developers Discussion List
Subject: [Xerte-dev] Reading url parameters in Xerte via javascript - strange behaviour in IE8
 Recently I have been working on opening up Xerte projects via a url which includes a parameter to specify which page to open the project at.
 I have a javascript function which returns a url parameter, you pass the name of the parameter in the function call and it returns the value for the parameter if that parameter name has been included in the url.
 When included in a html page it works reliably in IE8, Opera and Firefox.
 However when I add the function to the end of rloObject.js and open the Xerte project with a url like the following (running a Xampp install of XOT)
 http://localhost/toolkits/play.php?template_id=20&pageID=bullet
 and including in a script in the Xerte project the lines
 destinationPage = callJS("myFunction","pageID");callJS("alert"," destinationPage = " + destinationPage );
 In Opera or Firefox I get an alert box that displays "destinationPage = bullet"
but in IE8 I get an alert box that displays " destinationPage = null" 
If I use the Developer Tools in IE 8 and put a break point in my function I can watch the parameter be correctly gathered by the javascript function and returned.
 The debugger then shows the next stage in the process as being back in the flash environment with the current line shown in yellow below
 function __flash__escapeXML(s) {
return s.replace(/&/g, "&").replace(/</g, "<").replace(/>/g, ">").replace(/"/g, """).replace(/'/g, "'");

}
function __flash__toXML(value) {
var type = typeof(value);
if (type == "string") {
return "<string>" + __flash__escapeXML(value) + "</string>";

} else if (type == "undefined") {
return "<undefined/>";
} else if (type == "number") {
return "<number>" + value + "</number>";
} else if (value == null) {

return "<null/>";
} else if (type == "boolean") {
return value ? "<true/>" : "<false/>";
} else if (value instanceof Date) {
return "<date>" + value.getTime() + "</date>";

} else if (value instanceof Array) {
return __flash__arrayToXML(value);
} else if (type == "object") {
return __flash__objectToXML(value);
} else {
return "<null/>"; //???
}

} If I set a watch on "value" it correctly displays in the watch with the value of the url parameter
i.e. if my url has &pageID=bullet, and I called my function with destinationPage = callJS("myFunction"."pageID");
then the watch shows "value" to be "bullet" 
Since the type is a string the function  __flash__escapeXML(s) gets called. 
If I set a watch on s in this function then this also displays with the value of "bullet" 
However when you step beyond the line return s.replace(/&/g, "&").replace(/</g, "<").replace(/>/g, ">").replace(/"/g, """).replace(/'/g, "'"); 
 the debugger changes to display 
try { __flash__toXML(alert("destinationPage = null")) ; } catch (e) { "<undefined/>"; }
 I don't know if the functions revealed by the debugger are part of Xerte or part of the browser's flash player, but the problem appears to lie here in that somehow even though the javascript has been able to return the url parameter to the flash environment, the flash environment is then returning a value of "null".
 If I can overcome this problem then it should be possible to call a XOT project via a url and open the project at a specific page in IE8, just as I now can if the project is opened in Firefox or Opera.
 Can anyone with more knowledge of the Flash side of things cast any light on what is going wrong or how to fix this?
 Kind regards 
Johnathan  


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