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
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.
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)?
View 4 Replies View RelatedI 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?
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.
View 3 Replies View RelatedI 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.
View 5 Replies View Relatedfunction 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(){}
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;
}
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:
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?
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]...
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.
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
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]...
i have a small (LAN only) web server running on my computer, and i would like to be able to make a web page in which i can run a program on the server computer from another compuer. say, for instance, i click a button on the web page running on the server, i want that action to run a .exe on the server. i came up with this code, but it doesn't run it server side, it runs it on the computer with the browser.
<HEAD>
<TITLE>Run Executable HTA</TITLE>
</HEAD>[code]....
every time I try and alert:
[ { number:0, secondnumber:0 }, { number:2, secondnumber:1 }, { number:1, secondnumber:2 } ]
it just shows [object object], [object object], [object object]. Why is this and what can I do to make the record be shown as it is above in an alert?
Is there any way at all to create a new template object that inherits from the built in Date object so as to be able to add new methods to that child object without adding them to the built in Date object? I've tried everything I can think of and as far as I can tell it keeps referencing the Date function instead of the Date object and so doesn't work.
View 3 Replies View RelatedI have a select with a OnChange Function. I would like to know how to create a different object depending on the selection on the Select.
Example:
MySelect have Option 1 and Option 2, so
If (Myselect.value == Option 1)
{Create Object 1}
If (Myselect.value == Option 2)
{Create Object 2}
I'm using the object under <body> and it's working, but when I'm trying to use it under a <script> does not work.
This is the object I'm trying to create: (It is a map) so what I'm trying is to change the values or map depending on the selection of the Select.
<object classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=7,0,0,0" width="900" height="600" id="zoom_map" align="top">
<param name="movie" value="us_albers.swf?data_file=senate.xml" />
<param name="quality" value="high" />
[Code]....
How can i create an input object (text area,select) at runtime ?
View 3 Replies View RelatedI know I can use the functions like parseFromString() to access and modify an existing XML documents, but is it possible to use JavaScript to create a blank xml document?
I want to take data entered into the client, package it up as XML and use ajax to transmit it to the server. So far I've written my own class to create a simple xml document, but I'd like to do it properly with the inbuilt functions.
How can you use an integer as an object? The idea is to create dynamic object according to a particular id which is an integer
var newObject = function(integer) {
window.integer = {};
}
I cannot console.log(window.123), only console.log(window.integer) ...
how I create the object window.123 or perhaps, window.id_123 ?
Can anyone suggest how to create an arbitrary object at runtime
WITHOUT using the deprecated eval() function. The eval() method works
ok (see below), but is not ideal.
function Client() { }
Client.prototype.fullname = "John Smith";
var s = "Client";
eval("var o = new " + s + "();");
alert(o.fullname);
Note: I want the type name of the object to be represented as a string
(in this case "Client" -- this is a non-negotiable requirement).
I also tried the following (which appears to fail):
function Client() { }
Client.prototype.fullname = "John Smith";
var s = "Client";
var o = new Object();
o.construct = s;
alert(o.fullname);
eval() is handy but not future-proof, so any suggestions would be
welcome.
I like to create a hyperlink by html or javacript.
In the swish file, there are no hyperlink. But i like to create a hyperlink by writing code as like as image or a text.
Is there a way to do the following?
<script language="javascript" type="text/javascript">
function newfunction(objectName) {
// how can I create a new obect called whatever is contained in the objectName string?
}
//create a new object called myObject
newFunction("myObject");
myObject.getAttribute("objectAttribute")
</script>
I am trying to create an xmlhttprequest object to update the shopping cart on my web page without submitting the entire page to the server for processing. However, what I have done so far is not working. All that is happening when I click the "update cart" button is the page sort of flashes and the check marks in the remove item check boxes disappear. The first code snippet is the "traditional" way of submitting the whole page to the server for processing - and it works. The second snippet is what I have done to try and implement AJAX to submit only the shopping cart - and it does not work.
<html>
I receive a response from an ajax call and I need to load the response into a Json structure like so:
Code:
var data = { "products": [
{" longitude": 151.6838460, "latitude": -33.0086640}
,
{"longitude": 151.4008410, "latitude": -33.4728590}
[Code]....