Error: Object Is Not A Constructor?
Mar 20, 2010
I am trying to understand why I had an error, or why my solution worked. In my HTML I had:
<script language="JavaScript" type="text/javascript" src="Book.js"></script>
<script language="JavaScript" type="text/javascript" src="Book_TEST.js"></script>
Book.js said:
[Code]....
Now, the code worked fine in both script. (i.e., no more error.) So far as I can tell, the only differences between the first and next version of Book.js are the comments and the whitespace. Am I missing something? Can the comments or whitespace somehow effect the logic with which this code has been executing? If I get an error like this again, is there an easier/better way to fix it than to essentially retype the code?
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Apr 5, 2011
How would I go about copying all the prototype functions AND the constructor from one object into another object, and then call them?
I know I can use this.example.call(this), but that's not an acceptable solution. I want to deploy this style over dozens, potentially hundreds of objects.
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Feb 9, 2010
I need to detect the "name" of the constructor of an object. For example, myArray.constructor === Array is true, but I want something where that === 'Array' is true. I've heard of Object.constructor.name, but it's not widely compatible. (preferably without involving regular expressions)?
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Jul 9, 2010
How to extend the constructor for the date object of the javasccript so that whenever a call is made to the constructor, I want to perform a particular action? Basically how to define wrappers for default javascript methods or objects like Date() so that I can perform some action and then invoke the original method? So basically if I have something like var a = new Date(); I want it to (say) alert the value of the date everything Date() is called and then execute the default date constructor.
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Mar 23, 2011
I have a requirement to override the constructor of a javascript class. I have to execute the current constructor code and then call a javascript method. Basically, I need to execute a javascript method whenever an object of that particular class is created in addition to whatever is being done now. I do not want to copy and paste the current constructor code and override the initcomponent method. I am looking for an alternative for that.
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Jan 1, 2011
I need to create a constructor for a computer object. This object must have three properties: speed, and mem_live mem_dead. Then I need to create a new object using this constructor and then have its properties displayed on the screen.Look at what I'm up to so far:
function Computer(speed, mem_live, mem_dead)
{
this.speed = speed;
[code]....
It always just shows : 4.0ghz, true, false
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Aug 8, 2005
function show() {
var s = '' ;
for (var i = 0; i<arguments.length; s += '
'+arguments[i++]) ;
typeof(window) != 'undefined' ? window.alert(s) : WScript.Echo(s) ;
}
function f(){}
show('delete(f):',delete(f)) ; // false
g = function(){} ;
h = new g() ;
show('h:',h) ; // [object Object]
show('delete(g):',delete(g)) ; // true
show('h.constructor:',h.constructor) ; // function(){}
show('delete(h.constructor):',delete(h.constructor )) ; // true
show('h.constructor:',h.constructor) ; // function(){}
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Dec 3, 2005
is there a delete for a object inside the constructor, while i init it?
i will try something like that:
var obj = function(a)
{
if (!a) delete this;
this.a = a;
}
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Jul 20, 2005
Sorry, bad title. Anyway, is there a way to pass the arguments to an object
instantiated via a constructor using the arguments object and have it
expanded, so to speak, so that it doesn't appear as a single argument? I'm
sorry, this explanation is just atrocious, but I can't think of exactly how
to word it. Maybe an example...
Take for instance Function.apply. It takes 1-2 arguments, the first being
the object to use as the context, and the second being either an array or an
instance of the arguments object which are to be the arguments for the
function. I want to do something similar but I want to also basically use
the new operator so that I get back an object.
Here's a snippet of some of my code, maybe this will help:
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Jan 2, 2011
I'm sure this question has been asked many times before, but I can't seem to get the correct terms to find the answer in Google.I understand basic JavaScript inheritance. However, everything I've read makes the inheritance work something like this:
Code JavaScript:
var ChildClass = new Function();
ChildClass.prototype = new ParentClass();
ChildClass.constructor = ChildClass;
That's fine, but what happens when ParentClass's constructor needs parameters?As an example, look at the following code:
Code JavaScript:
function Furniture(color){
this.color = color;[code)....
How could I "copy" Furniture's constructor into the Chair object? Better yet, how could I copy Furniture's constructor and then add some functionality to it?
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Jun 12, 2011
I have a code set up something like this:
[Code]....
The problem is I keep getting an error along the lines of: TypeError: Result of expression 'house' [[object Object]] is not a constructor. It seemed to work when I wasn't passing the other objects as parameters in the constructor. I just created and assigned them later. As in:
[Code]...
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May 20, 2009
I'd like to make a Degree object that inherits from the Number object and uses the Number constructor but adds a .rad() method that returns the value in radians.
If I do something like:
It generally works but I don't get Number's methods like toString and toPrecision.
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Nov 19, 2009
I had read from books that the constructor property of object is inherited from its prototype. And the prototype can be changed dynamically. New property can be added to or deleted from object even it was created before the prototype change.
But I got confused on below codes.
But the actual result (both IE and firefox) is
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Sep 20, 2010
I have static object and I want remake it to a constructor with property 'length' which would be not enumerable in for loop... This is my object and how I generate it
[Code]...
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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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Sep 23, 2011
I am using a Photo Gallery script called Galleria which uses jQuery/JavaScript to display photos. On my index page load (only in Internet Explorer), a message box pops up saying "Message from Web Page [object Object]". After clicking OK the photo gallery loads and there is no problem.No idea how to fix this, or really what the error means. You can view the error from my site here
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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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Jun 17, 2009
Site - [URL] Location of js and css - [URL] The jCarousel works great in all other browsers, but in IE, when you get to the end of the jCarousel it gives the "Error: 'url' is null or not an object" pop up and it won't let me use the left arrow buttons to go back.
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Oct 19, 2011
I have taken part of some code I know works and simply added a print statemet to it as I want it to print to the command prompt, where I am running the script, the value of REMOTEDIR why the addition of the print statement provides an error: ERROR: JScript runtime error: Object expected
[Code]...
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Mar 27, 2006
Can someone please illuminate to me why, in the following snippet of script,
the alert statement in the try-catch gives me [object Error] ? The file
'http://localhost:1222/roomx1/getdata.php' truly does exist.
if(typeof window.ActiveXObject != 'undefined'){
req = new ActiveXObject("Microsoft.XMLHTTP");
req.onreadystatechange=processReqChange;
}else{
req = new XMLHttpRequest();
req.onload=processReqChange;
}
try{
req.open('GET', 'http://localhost:1222/roomx1/getdata.php',true);
}catch(e){
alert(e);
}
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Jul 3, 2006
I have a try/catch statement on my webpage, in which a create som html.
Sometimes this routine fails and the catch writes the error in an alert box.
My problem is that the only
thing the error says is [object error] even though I write all the
attributes in the Error object (name, number, description, message).
How can I inspect further what has gone wrong?
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Jul 23, 2005
I'm receiving an "Object Expected" Error (Line:28, Char:7). I'm confused as to what is happening. I have virtually the same exact function in a different web page and I do not receive an error with this other page. Also, if I run this code in Fire Fox, I do not receive any error. Is there something that I'm missing? The error is pointing to "TextChanged();". Code:
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Jul 20, 2005
One person to date has received a runtime error message saying "parent.frameleft.location is not an object" with the following code. The code is used to select 2 frames at the same time...
<script language="JavaScript">
<!--
function Home4()
{
parent.f-left.location.href = "subject-left.htm";
parent.f-right.location.href = "info-right.htm";
}
// -->
</script>
above is called from another page by the line (by clicking on a button) .....
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Apr 5, 2010
I am getting an error on this code - sometimes! - and I'm not sure what it is. If I run this as is there is no error. If I add it into another page with other stuff it's ok for a while and then I get an error. So, I added my new page block my block to this code and waited for the error to appear so I could determine a conflict - but it was fine. And then a few clicks later the error.
This is the error in IE. In Firefox it seems to be fine.
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Mar 25, 2011
Here's one that I don't understand:
<script type="text/javascript">
fso = new ActiveXObject("Scripting.FileSystemObject");
myCollection = new Collection();
[code]....
During execution, I get a "Object not a collection" error when I try to pass "MyCollection" to the Enumerator function. What am I missing?
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Jul 1, 2003
I am working on a site and have put some javascript in to control the size of the image that gets displayed on the page, however it runs ok but always returns an error after loading, and I can't find a cause. Code:
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