Object Declaration Question?

Oct 9, 2006

Below are some over simplified examples of code the create a single
instance of an object and I was hoping some one could give me the pros
and cons of each approach.

First declaration: In this case a single object is created using object
literal notation and both the get and __Private methods are availabile
for use and no closure is created.

ABC.Util.SomeObject =
{
get : function(val)
{
return this.__Private(val);
},

__Private : function(val)
{
return "testing";
}
}

Second declaration: In this case a single object is create and only the
get function is availabile for use and a closure is created.

ABC.Util.SomeObject = function()
{
var __Private : function(val)
{
return "testing";
}

return {
get : function(val)
{
return __Private(val);
}
};
}();

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Cannot Access Global Variable Inside Object Declaration

May 9, 2011

Well, it turns out IE8 has yet another problem. My code has a global variable (to the object) inside an object declaration that cannot be accessed by a function (that is also global).

The code is like so:
Code:
function myobject(params){
//public
this.initialize = function(){...}
//private
some variables...
//problem variable
var mouse = new Object()
mouse.x = 0;
mouse.y = 0;

//code...
slidecontainer = document.createElement("div");
slidecontainer.onmousemove = function(event) {
if(boo.isIE) {
e = window.event;
mouse.x = e.x + document.body.scrollLeft;
mouse.y = e.y + document.body.scrollTop;
} else {
e = event;
mouse.x = e.clientX + document.body.scrollLeft;
mouse.y = e.clientY + document.body.scrollTop;}}

//this function is in an interval
function moveslides() {
/* this is where I have the problem

It seems that the function doesn't recognize that mouse.x, or mouse for that matter, exists. Mouse is global to the object, so why can't this function access it?
*/if(mouse.x) {
code...
}}}
The page is at [URL] and works on every browser, including finnicky opera, except for ie. The full code is availabe when you right click and view the source on the page.

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Function Declaration

Dec 13, 2006

What is the difference between:

function setupGrid( param ){......}

and

setupGrid = function( param ){......}

Are there any advantages to doing one over the other?

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Array Declaration On FF Vs IE

Sep 13, 2007

There is something that I don't understand well, I use array for
combining strings like

items = ['hello world', ', how are you', '?', 'the end'].join('');

in FF this works well but in IE I had to add something like this

var items = new Array();
items = ['hello world', ', how are you', '?', 'the end'].join('');

My question is why is there a need for var items = new Array(): and
why items = new Array(); doesn't work? I don't want the items to be a
global variable, since it was declare inside a function I want it to
be local only.

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Css Declaration And Javascript

Dec 5, 2006

i wonder how can i have both javascript writen inside body and css declaration
here's my page: i only see the output if i comment the css line: Code:

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Create CSS Declaration In JavaScript (in IE6)?

Jun 15, 2006

I know that IE6's support for CSS is well... hmmm... lets just say not very good, however I was wondering if style declarations can be added at run time, via JS?

e.g.
Can I create a new rule?

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Use A Literal In A Function Declaration?

Jun 14, 2010

I have the following code which attaches a function to events in x number of comboboxes (x will probably always = 4, but I do not want to hard-code this). I wish to pass the value of i to the function being attached as well as the value of tempData. In other words, I want the parameters in function to be the value, not a reference variable.

In the current example, I am using the hard-coded variable ci. This I want to be replaced by a literal created when the event handler is attached (the value of the loop variable i). Also, notice that I get the filter value in the event handler (assigned to the variable ct). I would like to replace this code with the value of tempData which would also be determined when the evenet is attached (it is the same value in this case, but it keeps the onChange event from having to do this each time it runs).

var props = {
col_0: "select",
col_1: "select",

[code]....

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Function() Declaration - With No Name - When Does It Execute

Feb 14, 2010

I've been looking all over for an explanation of this function declaration but cant find it. what it means to have a function with no name, just declared as this. When does it execute? How does it get called?

For reference, here's the function:

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Doctype Declaration Must Be On The Very First Line?

Oct 19, 2010

is it true that the doctype declaration must be on the very first line (there mustn't even be a blank line above it) in order for it to be "working correctly" ?

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Declaration Order Issue

Aug 28, 2005

Say I have a code snippet like the one below:

var elm1 = document.getElementById('elm1');
var elm2 = document.getElementById('elm2');

function doStuff(e) {
// Some stuff is done here...
}

function addListeners(e) {
elm1.addEventListener('click', doStuff, false);
elm2.addEventListener('click', doStuff, false);
}

window.addEventListener('load', addListeners, false);
This code will generate an error, namely "elm1 has no properties". To many I guess this isn't very surprising, and my own take on this is that the addListeners function is run before the variables are declared. But what I fali to see is why? To me, a fair beginner with JS, everything is in its right place. What am I missing?

I would very much appretiate if someone could explain the order (when and where to declare the different parts) in which my code here should be ran. Is there something special to have in mind when using window.addEventListener('load', functionname, fasle);?

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Variable Declaration Issue

Jun 20, 2007

i did not undestand weather 'var' Keyword should be used or not when declaring variables. i already familier with php and there i will not use a 'var' for variable declaration. i like to program JS using similler PHP sysntax. so i code JS with out 'var' for varialb declarations and it works.

but can you please tell is it ok to declare variables with out the key word 'var'? if this is not good, then do all global and local variable declarations requir 'var'?

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Forms - Functions And Variable Declaration

May 28, 2009

I have been having trouble with forms and functions. On my wife's site I have some forms and some of them have radio buttons. My current radio button checker is cumbersome and it is time for something more elegant (some of you will say if it isn't broke don't fix it )

The new code is below:

Code:

Basically I want to pass into the function radio button values 1 & 2 denoted by firstChoice and secondChoice (eventually I want to also pass in the form name but 1 step at a time).

The buttons can have the value (names?) of pattern, chalkboard or kit. It is for a shopping cart (Mal's E-commerce) and this is part of the JS validation. I am using onsubmit to call the function viz.

HTML Code:

Seems ok (to me at least) but when I try to get it to work it throws up an error of

Code:

It stops at that point but undoubtably chalkboard would throw up the same error if it continued.

How would I define the variables in my function? Are they strings, integers, who cares?
Where would I define them? Global or local?

Is the problem a matter of syntax e.g. if I put ' ' or " " around them would that suffice?

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Document Declaration Prevents From Working?

Jan 22, 2010

I have the javascript (which is pasted at the end of this request) on my website, but it will not work whenever I include the Document Declaration just above my <head>.

Is there something I can change in the code that will make it work?

The top part is in the head and the second part is at the end of the html code.

Here is the code:

<SCRIPT LANGUAGE="JavaScript">
<!--
floatX=25;
floatY=125;
layerwidth=100;

[Code]....

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Oct 13, 2009

I'm creating matrix of values like this:[code]Usually when i want to access position like Matriz[0][0] y retrived the value "", now for some reason when i debug appears "indexOf" at the beggining and when I access Matriz[0][0] I get "undefined".Someone knows why is happennig this, i'm using IE 6

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Feb 8, 2009

I understand that there is no need to initialize a variable at the point of declaration. OTH, what is the default type of a [declared] variable? For example:

[Code]...

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Declare Null Parameter Within Function Declaration?

Feb 13, 2009

Take a look at this example:

Code:

function foo(var1, var2=NULL){
if(var2 != NULL){
//do something
}

[Code]....

and in this scenario, var2 would have a NULL value

My question is: Is it possible to declare a null parameter within a function declaration in javascript? (as in the example)

I know this is possible with PHP, but i am having problems with this in Javascript.

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Jan 6, 2006

I have Declared same function and two diff javascript files and both files are included in HTML page and one more same function declared in HTML code too... So problem is that, which function will execute first, i mean function in either javascript or function in HTML Code?

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Apr 9, 2011

I want to add this html code as a var or a const, so then later I could do document.write(x);

Like:

But this do not work.

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May 11, 2011

If you specify arguments when writing a function should you still declare the argument variable inside the function?

example:

Code:

or

Code:

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Mar 4, 2011

What are these used for? How are they done in JS? Any refs online?

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Apr 11, 2007

consider the next code:

var obj = {};
with(obj) {
var x = 10;
}
print(x);
print(obj.x);

It prints 10 and undefined. Here, one could expect that obj.x get the
value 10. But it's not the case, because variable declarations are
placed at the start of function code (or global code), so the
previous code is equivalent with:

var obj;
var x;
obj = {};
with(obj) {
x = 10;
}
print(x);
print(obj.x);

You can clearly see now that x is placed in the outer context. But
consider the next:

var obj = {};
with(obj) {
eval("var x = 10;");
}
print(x);
print(obj.x);

I was expecting that obj.x would get the value 10 here. But no, it
gives the same output as the previous code. I tested it with
spidermonkey, kjs and ie jscript. Looking at the ECMA spec, I could
not find anything that describes that behaviour. Code:

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Nov 19, 2011

I just got this script for a countdown on a website and I got it to work locally but when I upload it to the server i get the error "index.html:22 Uncaught TypeError: Object [object Object] has no method 'fancycountdown'".

I have checked to make sure all other javascript files are loading and they are and I can't figure out whats wrong. You can see it [URL]

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Literal Notation: Change Values Of A New Object Without Changing The Parent-object?

Oct 9, 2010

I have the following code:

A = {
"value": "a",
};
B = A ;
B.value = "b";
alert (A.value); // => b

I expected A.value to be "a". how can I change values of a new object, without changing the parent-object?

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JQuery :: Uncaught TypeError: Object #<an Object> Has No Method 'createDocumentFragment'

Oct 5, 2010

13 line causes this exception. Function is called insied of ready() handler. function renderGridSystemRecursively(scheme, container){

[Code]...

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Submission Error In IE - Object Expected Or Object Is Null Or Undefined

Oct 15, 2009

I have come across an issue that only happens with IE.I have a custom save function that is designed to handle different ajax submits but I will simplify it for debugging. The issue is that once I make a submit everthing is fine at first. Then once I try to submit a second time it craps out. I am checking to see if there is an onsubmit function and then executing it like so before continuing. After the inital submit it is no longer found. When I alert the typeof document on the form it returns object but when I add the onsubmit it says object expected or object is null or undefined.

Code:

function secureBarSubmit(formId)
{
alert(typeof document.getElementById(formId)); // object always
alert(typeof document.getElementById(formId).onsubmit); // func first time then it is broken

[code]...

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Object Methods - Assign A New Function To A Built-in Object In Firefox

Jul 1, 2009

Can assign a new function to a built-in object in Firefox:

But IE and Opera don't have a MouseEvent or HTMLElement that can be set up in the same way. Can you do this in IE or Opera, or just Firefox, and maybe Webkit?

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