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'm looking for the constructor parameter list for DOM Objects. I was able to find a constructor for Option but none of the others.
Code:
myForm = new Form(params);
myForm.elements.push = new Select(params);
myForm.elements[0].options.push = new Option('Select this!','1');
This is a lot cleaner than
Code:
myForm = document.createElement('form');
myForm.setAttribute('name','theForm');
....
Where I can find a list of these constructor parameters?
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 RelatedI 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
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(){}
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'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 am trying to pass dynamic String parameter to my javascript. The user enters sdome value and that is passed to the javascript as parameter. My problem is when user enters something of type cs204-1 or cs204.1 etc, the javascript does not run. On passsing simple parameters like cs204 or 111 etc, the javascript works fine. I need to pass any type of parameters to the javascript ( cs204-1 or cs204.1 etc) as I am making this for my college and the values to be entered by the user are of such type. My javascript code is : Code:
[Code]...
I tested the working of the javascript by using alert. It came for normal parameters but not for cs204-1 or cs204.1 types.
how to pass parameters in the <script ..> tag? for instance;
<script type="text/javascript" src="script.js?param1=val1¶m2=val2&etc">
in the javascript script.js, how would we read the params after the question mark? for example, google this; google shopping cart /v2_2/cart.js
I am trying to pass dynamic String parameter to my javascript. The user enters sdome value and that is passed to the javascript as parameter. My problem is when user enters something of type cs204-1 or cs204.1 etc, the javascript does not run. On passing simple parameters like cs204 or 111 etc, the javascript works fine. I need to pass any type of parameters to the javascript ( cs204-1 or cs204.1 etc) as I am making this for my college and the values to be entered by the user are of such type.
My javascript code is :
function deleteQuestion(id){
alert(id);
questionId= eval("document.form1.deleteQ"+id+".value");
url='/DeleteQuestionServlet?questionId='+escape(questionId);
document.form1.action=url;
}
I tested the working of the javascript by using alert. It came for normal parameters but not for cs204-1 or cs204.1 types.
I have an easy question, likely, that has me in a headspin. I have an
include file to a frames based site that basically forces frames on
the end user if they visit the site and hit a non-frames created
page...
Simply, it is:
if (parent != self)
self.parent.location.replace("/");
However, now I would like to force an inner frame to populate based on
what frame someone was redirected from the include (above). So, if I
visit http://domain/frame/innerframe_3.html, then I want to redirect
to the above, but pass in /frame/innerframe_3.html to be included as a
URL parameter for an inner frame to be populated.
When I modify this link to:
if (parent != self)
self.parent.location.replace("/index.php?redir=" & location.href);
Then, the replaced location doesn't seem to recognize the ?redir=
portion of the new location.
Is there a different way to do this? I can't use a META tag because I
want the TARGET to be _TOP, basically.
My button when click call cal function, inside cal function I need to find parent so I can access other element, but I donot know how to pass parameter to Selectors/has(for some reason $("div :button").each(function()... no work here)
Code as below:
function cal(event) {
if (!event) event = window.event;
[code]....
Hi all.Am new to this forum so cut me some slack if I don't articulate my problem with utmost clarity.My problem is that I have a javascript function such as:
function modReg(x,y)
{
<!--
var answer = confirm ("Do you really want to deregister user" +x+"?")
if (answer)
{
document.leo["id"].value=x;
[Code]...
Now, leo is a hidden form with the 2 fields namely "id and "two".Viewing source, I see that the parameters I need are well acquired by the function.In next page, I haven't been successful at retrieving the passed parameters.
I am having some issues with getting a variable from an onclick event with javascript.
$('#preview_logo').append('<img src="'+fileObj.filePath+'" height="100px" hspace="5" /> '+fileObj.name+' uploaded.<a href="javascript:;" id="dele_image" onclick="del_image('+fileObj.filePath+','+fileObj.name+');">Upload Different Image</a><br>');
This is for uploadify script for previewing an image that is uploaded, it creates the link fine, but won't trigger the function "del_image" unless I delete the parameters in the onclick, which leads me to believe it is something to do with my quoting. Here is the function:
[Code]....
I have been checking out the following sitepoint tutorial on creating a plugin using Jquery http:[url]....I have some Questions about the selector and the parameters.Say for example, I wanted to pass parameters into the plugin:
Code:
(function($) {
// jQuery plugin definition[code].....
And conversely if the plugin takes no parameters $(selector).MyPlugin(); Firstly is my understanding correct and secondly what if the plugin doesn't require a selector? What if it doesn't need to do anything to a given DOM element? would it be something like:
$().MyPlugin(someparameters)
I am passing parameters via URL to my HTML form. The hardcoded hidden values work. Does anyone know how I can modify this so that the parameters can also write to the hidden values?code...
View 3 Replies View RelatedI want to pass two parameters on button "b" click. how to pass parameters on b.onclick = test function?
function test(x, y){
alert(y);
}
var b = document.getElementById('b');
b.onclick = test; //how to pass x and y parameter?
I am trying to remove a title attribute for a link on hover and then add it back on mouse out. I would like to pass var hoverText to the hover out...
[Code]...