Hi TJ,
This is the simple script which will say "MYAPP.class1 is null or not
an object - Line 33" about 25% of the time on IE8 in IE7-compatability-
mode. You must hit refresh a few times and then click the button to
see the error. Maybe we need to find out what makes IE7 and 6's JS
engine different from IE8's.
++++++++++++++++++++++++++++++++++++++++++++++++
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://
www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<script src="scripts/lib/prototype.js" type="text/
javascript"></script>
<script src="scripts/src/scriptaculous.js" type="text/
javascript"></script>
<script type="text/javascript">
//<![CDATA[
var MYAPP = {
Class1: null,
class1: null
}
MYAPP.Class1 = Class.create({
initialize: function() {
this.myValue = 'my value';
},
speak: function() {
alert(this.myValue);
}
});
Event.observe(window, 'load', function() {
MYAPP.class1 = new MYAPP.Class1();
});
//]]>
</script>
</head>
<body>
<button onclick="MYAPP.class1.speak()" />make class1 speak</
button>
</body>
</html>
+++++++++++++++++++++++++++++++++++++++++++++++++++++
On Sep 4, 12:51 am, "T.J. Crowder" <[email protected]> wrote:
> Hi JoJo,
>
> I suspect there's some small (but important) piece of information or
> understanding that you don't have, being a beginner, but we're
> shooting a bit in the dark trying to identify it.
>
> Can you create an example of the problem using one very simple HTML
> file and (say) two script files? (Three if you need it to make the
> problem occur.) Paste them in Pastie[1] and drop us a link here, and
> we'll try to figure it out.
>
> FWIW, I've never had a problem with files getting loaded and executed
> out of order. I find it very, very hard to believe that that's
> actually happening (Alex, if you have a reference for your earlier
> comment, please do share it), the number of sites that would break is
> legion.
>
> If that really _is_ happening, another way to solve it is to combine
> all of your JavaScript files into one file as part of a build
> process. There are good reasons for doing that anyway; more here.[2]
>
> [1]http://pastie.org
> [2]http://proto-scripty.wikidot.com/prototype:tip-minimizing-download-times
>
> HTH,
> --
> T.J. Crowder
> tj / crowder software / comwww.crowdersoftware.com
>
> On Sep 4, 7:17 am, JoJo <[email protected]> wrote:
>
> > My classes are just class definitions.
>
> > MYAPP.Class1= Class.create({...});
> > MYAPP.Class2= Class.create({...});
>
> > I don't create the objects until I get to main.js, which creates them
> > after the window has loaded. Why is IE7 not giving an error when I
> > access MYAPP in Class1.js and Class2.js, but is giving an error when I
> > access it in main.js? This native and function object talk just went
> > straight over my head. I am only a beginner to JS.
>
> > On Sep 3, 10:51 pm, RobG <[email protected]> wrote:
>
> > > On Sep 4, 3:43 pm, RobG <[email protected]> wrote:
>
> > > > On Sep 4, 4:40 am, JoJo <[email protected]> wrote:
>
> > > > > ^ great article!
>
> > > > > Now I have another question. Here is my new workflow in an attempt to
> > > > > execute files in the correct order across all browsers. It works in
> > > > > IE8, but not in IE7. In IE7 I get an error saying "object expected"
> > > > > on line 2 of main.js. This is not very descriptive; what does it
> > > > > mean?
>
> > > > > (1) include my global wrapper MYAPP.js:
>
> > > > > MYAPP = {class1: null, class2: null}
>
> > > > MYAPP is an instance of the built-in Object object (i.e. a native
> > > > object). Because it has not been declared, it doesn't exist until the
> > > > code is executed.
>
> > > That is, until that line of code is executed.
>
> > > > > (2) include Class1.js (no instantiation)
> > > > > (3) include Class2.js (no instantiation)
> > > > > (4) include main.js:
>
> > > > > Event.observe(window, 'load', function() {
> > > > > MYAPP.class1 = new MYAPP.Class1();
>
> > > > Even if MYAPP exists at this point, the above won't work: the only
> > > > native objects that can be used as constructors are function objects.
> > > > MYAPP is and native object, it can't be used as a constructor as it
> > > > doesn't have an internal [[consruct]] method (functions do).
>
> > > Ooops, you're actually calling MYAPP.Class1 as a constructor, hey
> > > nasty. You say the other script files don't to any instantiation, so
> > > how do the MYAPP.Class1 and 2 properties get set?
>
> > > --
> > > Rob
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