Object Properties With Array Syntax - Add Extra Properties To Html Elements
Nov 13, 2009
how to add extra properties to html elements as I was storing data in html attributes. After looking at some others code including Raphael and this addEvent code. [URL] They seem to treat objects just like an array. obj[property] = value; This would have been extremely helpful to know previously as I have needed to be able to include variables in property names - but have resorted to making the whole thing a string and calling exec() on it.
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Dec 16, 2010
I've been working on a function to convert nodeList and object properties to an array. The first question is with regards IE and checking whether the object provided is an HTML collection. The best I have come up with so far, is to test if it's an object, has an 'item' which is a function and has length. The second question is with regards slice.call and a while loop copy. I guess I need to do some profile/timing tests, but I'm wondering if the function merits a slice.call? or should I simplify?
Code JavaScript:
// Some weirdness in IE regarding nodesList and typeof 'item' returning 'Object'
// even though when alerted it returns 'function (){...}'.
// Therefore having to use regExp.test() to check whether it's a function instead.
// Note: _isNodeList isn't full proof. An object with the properties
[Code]..
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Jul 11, 2011
I'm trying to get the properties for the following objects:
0: [object Object]
1: [object Object]
2: [object Object]
3: [object Object]
This was generated by using the following code:
[Code]...
Since object names can't simply be a number ie(this.oProducts.Product.0), how can I access the object properties in the list above?
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Mar 20, 2010
I created a method for displaying an object's properties:
As long as renderfunction = false, the object is fine coming out of this function.
However, if I change renderfunction to true, all my properties become undefined. Why isn't this working as I expect it to?
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Sep 16, 2011
I have the following question.
In my code, Ifirstdeclare a GLOBAL property to store all my global var's in, (with already some properties)[code]...
Does the second block of code overrides the first GLOBAL object? Is there a way to push more properties to an existing object using the same pattern?
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Feb 14, 2003
This is pretty simple, but if you've ever wished that the DOM exposed a label property for any form element that had a label specified for it, well, you'll enjoy this.
{
var labels = f.getElementsByTagName( "label" );
for ( var i = 0; ( label = labels[i] ); i++ )
f.elements[label.htmlFor].label = label;
}
Just pass it a reference your form and voila! You now have element.label.
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Mar 2, 2011
I'd like to change some properties of ASP Form Elements via Javascript and I am having a very difficult time doing so. The element is defined as:
[Code]...
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Sep 30, 2006
i'd like to know objects properties and/or methods.
saying i do have an object "o" being part of the dom (a div or an ul...)
how could i list (introspection) all the properties and methods attached
to this object ?
i know it is possible in javascript but don't remeber how to ...
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Jan 17, 2011
Do many programmers remember most of the object properties and methods or do they use IDE or references to find those specific objects. I'm starting to learn Javascript and seeing all the different type of objects available can be depressing. :(
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Apr 1, 2011
I am fairly familiar with the concept of Objects and their properties and methods, but javascript being object based as opposed to object oriented has me stumped on how to access an object's properties from an onclick event handler created for another object created within the original object.
In the example below, I have a constructor function called anyObj. to which I pass an object reference to an element.
anyObj has 3 properties and one function increaseWidth()
increaseWidth() creates a new button with an onclick event handler and this is where I have a problem.
The onclick function needs to increase the value of anyObj's this.width property. I originally had a line this.width += 10; in the onclick but quickly realised why this wasn't working because the this in the onclick function refers to the new button object and not the this.width property of anyObj.
The workaround I have used, and it works, is to make a copy of all the this.xxxxx properties. eg. width = this.width; and use the width variable in the onclick as you can see below. This "workaround" works fine but doesn't feel ideal to me.
So is there a better way to access the anyObj()'s properties from within the onclick function than the way I have done it? Obviously I would prefer to not have to make copies of all the anyObj() properties like I have to make them accessible to the onclick function.
function anyObj(divObj){
this.elem = divObj;
this.width = 50;
this.height = 50;
[Code]....
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Jan 2, 2008
Say x in a XML Http Request Object ... meaning it's either XMLHttpRequest (firefox) or ActiveXObject (IE)
This line of code works in firefox...
x.someProp = "someValue";
alert(x.someProp);
But in IE I get "Object doesn't support this property or method" I need to place a custom property on the object. Is there any way I can do that in IE?
I've already tried ActiveXObject.prototype.someProp = "";
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Mar 25, 2006
I've created an object and within this object, I've added an eventlistener. But the problem now is that after addEventListener is being called to access a callback function, the callback function is not able to access the properties within its own class. Code:
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Mar 31, 2011
I am fairly familiar with the concept of Objects and their properties and methods, but javascript being object based as opposed to object oriented has me stumped on how to access an object's properties from an onclick event handler created for another object created within the original object.In the example below, I have a constructor function called anyObj. to which I pass an object reference to an element.
anyObj has 3 properties and one function increaseWidth()
increaseWidth() creates a new button with an onclick event handler and this is where I have a problem.The onclick function needs to increase the value of anyObj's this.width property. I originally had a line this.width += 10; in the onclick but quickly realised why this wasn't working because the this in the onclick function refers to the new button object and not the this.width property of anyObj.
The workaround I have used, and it works, is to make a copy of all the this.xxxxx properties. eg. width = this.width; and use the width variable in the onclick as you can see below. This "workaround" works fine but doesn't feel ideal to me.So, what I am asking advice on is, is there a better way to access the anyObj()'s properties from within the onclick function than the way I have done it? Obviously I would prefer to not have to make copies of all the anyObj() properties like I have to make them accessible to the onclick function.
Code:
function anyObj(divObj){
this.elem = divObj;
this.width = 50;
[code]....
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Jul 13, 2011
I have the empty object and two variables:
[Code]...
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Aug 26, 2009
Code JavaScript:
function dropdown() {
}; dropdown.prototype = {
sele: $('.select'),
city: [],
scope: [],
type: [],
init: function(json) {
if(json.location.length) {
for(var i=0; i<json.location.length; i++) {
this.city[i] = json.location[i].city; .....
this.scope[i] = json.location[i].scope;
}}.....
getUrl: function() {
return location.pathname+location.search;
},
setUrl: function(paramType, param) {
return this.QueryString(paramType) ? this.setQueryString(paramType, param) : this.getUrl()+"&"+paramType+"="+param;
}};
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Jul 20, 2005
I was originally under the impression that css style properties could
be accessed/ listed since they exsisted as an array somewhere.
Is this just flat out wrong?
To illustrate - I guess I thought something like this could be used to
list available/ or set properties, or in this example the first
property. Is this just a fantasy? Or how does this work, at this level
or for document objects even?
//assuming <div id="menu"></div> exisists and hs styles applied....
document.write(document.getElementById('menu').sty le[0]);
//of course this is wrong...
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Jul 23, 2005
Well, I've been working with JS for three years and have a great experience here. But! I still have no really acceptable answer to the following
question:
What is the principle difference between declaring methods/properties
in the constructor function body and via prototypes.
Are there any real GURUs? Let's discuss the issue.
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Jul 23, 2005
In JavaScript 1.5, objects can use special getter and setter functions
[1] for properties. However, these only seem to be implemented in Gecko
and, AFAICT, don't seem to be part of ECMAScript.
Is there an alternative syntax I can use that is standardised in
ECMAScript and also (preferably) interoperably implemented in several
browsers? Or, do I have to use ordinary getFoo() and setFoo() functions. Code:
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May 8, 2010
I want to programmatically list all properties of JS object from C++ code (I am using Mozilla's JSAPI). I know I can go up the prototype chain with JS_GetPrototype, then enumerate each object's own properties with JS_Enumerate.
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Nov 24, 2009
I have an object: Myobject and properties for the object: Myobject.color, Myobject.width, Myobject.height The scripts returns TRUE if I query Myobject.color or Myobject.width etc. I want to loop through de properties like so:
Code:
var properties = ['color', 'width', 'height']
for (var i=0; i<properties.length; i++) {
Myobject.properties[i]; // Returns UNDEFINED
}
How to make it works? (Should returns TRUE)
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May 14, 2006
I've got an image gallery in which users can navigate between the next and previous image by clicking on the right or left half respectively of the current image. When the mouse is over the left half an arrow pointing to the left is shown on the image and when on the right an arrow to the right. It works fine if i use inline javascript but i'm trying to achieve the same effect unobtrusively and with an addEvent function. The onmouseover part works fine but from the function that fires on the onmouseout event i get the following error in Firefox and the arrow is not hidden:
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Dec 5, 2010
I don't know why but after the animate() function it's like all the properties get wiped.
PHP Code:
bubble.prototype.expand = function() {
var _this = this;
this.mLeft = parseInt($(this.div).css('margin-left').split('px')[0]);
this.mTop = parseInt($(this.div).css('margin-top').split('px')[0]);
this.iWidth = $(this.iconImg).width();//icons dimensions
this.iHeight = $(this.iconImg).height(); .....
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Sep 22, 2006
Subject line would seem to say it all:
How does one trigger the execution of a method within an object or any
other code/function with the setting of an object property?
More elaboration for those who want it:
Suppose we have anObjectType, with a property .description, whose value
can be a string, and the value of .description actually describes the
structure of anObjectType as a string. (The details are not important
about how the structure is described, but if you want something concrete,
think of 'anObjectType' as a DOM Node of type NODE_ELEMENT, and
..description as the property .innerHTML.)
When an instance of anObjectType is created, the value of description is
created with the instance. Indeed, the value of description may not be
set with the construction of anObjectType, but it might be added to the
prototype of anObjectType.
But the property .description is not merely read-only. Fetching the value
of .description returns the string which describes the structure of the
object in a meaningful way.
When .description is set with a value of type string, the string is
checked to see if it properly describes a legally formed structured for
anObjectType, and the instance (and only that instance) of anObjectType is
completely re-built: it might possibly be destructed and then re-
constructed, or all properties (but not methods) which involve descendant
objects are changed to conform to the described structure.
The question is, the setting of a string value of the property
..description of object anObjectType does not automatically trigger a
method/methods (or an exception??) for doing something (such as
restructing the object) as a result of the setting of an object property.
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Aug 30, 2010
This object was passed to my click event handler. Why are so many properties missing? The click event came from an <a> in a <li>, propagated down to the <ul> on which the handler was set.
If I click on the <ul>, the event object looks "normal".
[Code]...
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Aug 11, 2003
if I'm using IE only I can get around just fine, but I haven't really had a lot of experience sniffing out other browsers and trying to create different code branches to create the same effect on a particular browser.
In this case I've got a series of layers that correspond to some links. When someone mouses over the link, the layer becomes visible. When someone mouses out, I want the layer to fade out. Code:
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Jun 20, 2010
I've got a javascript object is "is" that has dynamically populated properties. I make an ajax call to my database to grab usernames associated with unique ID's and populate the javascript. I can call a property directly like this: aler (is.softUser1) or alert(is.softUser2) and show the corresponding values. However since what is being returned from the database is dynamic I may need to call is.softUser5 or is.softUser8 so I need to do that call dynamically. code...
and that obviously doesn't work.
Is there a way that I can dynamically call that property based on whatever value "user" is?
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