Overwriting A Prototype Function And Keeping Scope?
Nov 3, 2010
Not sure if this is possible, but I have an external script that creates an object, and I want to overwrite some of its functionality, but keep the scope.
Here is a basic example:
Code:
<script>
Obj = function (userConfig) {
this._init(userConfig);
[Code]....
I want it to log two Objects, but instead I get two window elements. Is this because I am declaring the functions in the global scope, and not from within the object?
Anyway I can keep the scope of the object, whilst still overwriting the function?
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Jul 12, 2009
I'm trying to learn more about creating and using JavaScript objects and ran into this situation the other day:
Code:
function someObject() {
var size = "large";
[code]....
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Jul 14, 2010
I'd like to move the global variables vertexBlaBuffer to the scope of the Geometry prototype [code]...
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Nov 25, 2011
According to ECMAScript, the root of the prototype chain is Object.Prototype. Each object has an internal property [[Prototype]] that could be another object or NULL.... However, it also says that every function has the Function prototype object: Function.Prototype, it confused me, because a function is an object, for a function object, what is its function prototype and object prototype..For example:
var x = function (n) {return n+1;};
what is the relationships of x, Object.Prototype and Function.Prototype
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Dec 14, 2009
I am trying to get to the bottom of javascript object, prototypes etc. I have a fairly good grasp of it, but I get confused the closer I get to the base object.prototype. FIrst of all, I was under the impression that all objects descend directly from Object. But some objects (like Array) seem to inherit properties and methods from the function.prototype. So does this mean that the chain is like this:
object -- function -- array Second, I noticed (on the mozilla javascript reference site that object.prototype inherits properties and methods from function.prototype and vice versa!? How can this be? I must be missing something important about understanding the chain?
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Apr 4, 2010
I'm wanting a table cell click event to remove and replace the table it was clicked on, however I'm finding that as it's deleting the original table object the actual running event code is being replaced and the function is bailing.how I can call the delete/refresh function from outside the event's function scope?
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Sep 8, 2006
I'm trying to access some of the global's inside my class LiveSearch
and I have no idea how to go about it. Here is what I have so far:
<script type="text/javascript" src="query.js"></script>
<script type="text/javascript">
function LiveSearch(global) {
this.theglobal = global;
this.initialize();
}
LiveSearch.prototype.initialize = function() {
$("#thebutton").mousedown(function() { //when we click the button
alert(this.theglobal);
});
}
$(document).ready(function() {
var objSearch = new LiveSearch("globalvalue");
});
</script>
On page load I create a new LiveSearch instance and it assigns
theGlobal = "globalvalue" and proceeds to initialize(); At this point
Im using JQuery to setup an onmousedown event on a button on my page
with id="thebutton". When I click the button the alert comes back with
'undefined'. How can I get direct access to my theglobal variable? Code:
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Oct 30, 2006
I think I've had JavaScript variable scope figured out, can you please
see if I've got it correctly?
* Variables can be local or global
* When a variable is declared outside any function, it is global
regardless of whether it's declared with or without "var"
* When it is declared inside a function, if declared with "var", it's
local, if not, it's global
* A local variable that is declared inside a function is local to the
whole function, regardless of where it is declared, e.g.:
function blah() {
for(var i ... ) {
var j ...
}}
i and j will both be visible within blah() after their declaration.
* the notion of "function" in this context also applies for this kind
of construct:
var myHandler =
{
onClickDo: function()
{
in the sense that whatever one declares inside onClickDo with "var"
will only be visible inside onClickDo. What else, am I missing anything?
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Oct 27, 2009
I'm just starting out with Javascript as a development language and this will probably be a relatively simple problem for someone to solve for me.
I am trying to access a variable (this.bodyEl.innerHTML) from within a function but get an error message indicating that it is "undefined". I know that it is a valid variable because I call it elsewhere outside of the inner function itself.
I'm sure this is just a scope issue, but I'd welcome any suggestions on how to solve it with an explanation of where I've gone wrong if you have the time.
[Code]...
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Feb 2, 2011
I wanted to write my own script for a fade-in animation, since the ones I have found have got too many options or need some framework, which makes them unnecessarily big. I wanted to learn too.Unfortunately, the code didn't work as I wanted, and I commented some things so as to find out what's happening.Why is an object reference assigned to what was previously a string?
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Sep 30, 2010
I can't use the value returned by $.post() method out of the scope of success function.
For instance in below example myvar alerted as empty even though var is alerted with a value. Besides, hide does not work in the scope of success function.
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Oct 21, 2005
I want to overwrite the CTRL+S key via 'onkeypress' so, that the
browser doesn't recognize it as 'Save page as ..' command.
I assumed, that calling 'evt.preventDefault()' in my event-handler
would be sufficient. It isn't.
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Aug 4, 2009
Am developing MonthlyExpenses Project in which we have to enter details according to that date.
Date [IMG]datepickerimage[/IMG] Description Exptype Price
By clicking add button the dynamic row has to appear. But here , when I enter Date , the newdate is overwriting the previous one. New date is not appearing in new text box.
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Aug 5, 2009
hope I have your attention this time..Some of you propably know the problem with advertisment distributors and their excessive use of document.write() On the one hand, you tried to call advertisement as soon as possible, to have it shown as soon as possible. On the other hand, when you do that, an the advertisement library calls another remote script, which lags, your whole document lags. So you begin writing hacks to load advertisement at the end of your document, and traversing it to the positions, where it is to be shown. But your still bound to the document loading, since you cannot allow document.write() to be called
[Code]...
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Feb 27, 2006
I am trying to use the sortBy function in the prototype.js
library. Nevertheless, I can't work out what to include in the iterator
function. Can someone shed some light on this?
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May 5, 2010
Array.prototype.each = function (fn) {
this.map(fn)
}
This is my each function that works great in every other browser but IE. UGH! What am I doing wrong? the error points to the this in the function. Is it that IE doesn't like map? Has anyone seen this before? I thought my code was correct. Works perfect in FF, chrome and opera. the canvas text doesn't work in opera, but it does render the features so the each function is working.
I'll post the code if needed, but it's huge. here's the script running.[URL]..
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Jul 24, 2010
I'm working on a site and for my login area, instead of using labels for the textboxes, I wanted to just put default text in there.
The JS that I am using is supposed to only enter the default values in the textboxes if they are blank. Unfortunately, I think the JS runs before the browser puts the "auto remember" stuff into the boxs, so the JS will always put the default values in the boxes.
The problem is that, when its time for the browser to enter the auto remember stuff, it sees that there is already stuff entered, so it doesn't enter the previously-remembered login information.
I'm pretty sure that what I'm trying to do is possible, but maybe I'm going about it the wrong way. Could somebody suggest the appropriate way to do this? code...
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May 7, 2007
I found this code on Internet:
<script type="text/javascript">
Array.prototype.push = function() {
var n = this.length >>> 0;
for (var i = 0; i < arguments.length; i++) {
this[n] = arguments[i];
n = n + 1 >>> 0;
}
this.length = n;
return n;
};
</script>
Question 1: How to call this function?
Question 2: When I delete >>> 0, what I lose? ( >>>0 ı sildiğim zaman, ne kaybederim?)
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Jun 2, 2009
I have a periodicalUpdater that returns countdown time that is created with php but I now need to call out one function when the time is right. the script PeriodicalUpdater calls
[Code]...
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Jan 5, 2010
Is there a jQuery way of doing this Prototype bind?
var func = myFunction;
setTimeout
func.bind
this
, 1000
;
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Mar 22, 2010
I'm learning how to use Javascripts and using Prototype framework by following a step by step tutorial from a book. Unfortunately when I stepping through the following code:[code]
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Apr 19, 2010
This JS code is on RoR+ImgMap site.I've tweak several portion of ImgMap, specifically around line 2205 of the file imgmap.js by adding code.so that when the user draws a shape, the focus will be set to the respective href field, instead of the default behavior - adding new row(imgmap form).
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Aug 30, 2010
I need to know how to add an event to a button. The specific issue is that I want to add an event which is a prototype function of a class. Consider the following as an example:
MyTestClass = function() {
this.firstName = "Pete";
this.lastName = "Johnson";
[code]....
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Jan 8, 2010
I want to write a plugin, say 'myPlugin' which I can use like
Code:
$('#myID').myPlugin() ;
$('#myID').myPlugin.test() ;
The plugin I wrote looks like
Code:
(function($){
$.fn.myPlugin = function() {
// do something
} $.fn.myPlugin.test = function() {
var $this = $(this) ;
// do something ;
}})(jQuery) ;
This works and it doesn't work. It works because test() is called, but this is not the element with id '#myID' it is $.fn.myPlugin. To fix this I tried the following
Code:
(function($){
$.fn.myPlugin = function() {
// do something
} $.fn.myPlugin.prototype.test = function() {
var $this = $(this) ;
// do something ;
}})(jQuery) ;
but now the function 'test' is unknown.
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Nov 4, 2010
is there a way in jQuery to bind variables to function calls similar as prototype.js does it? See [URL]
E.g. in the slideUp method of jQuery you can specify a callback that is called after the effect has finished. I would like to bind a variable to this call so that it is used inside of this callback as a closure.
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Oct 30, 2006
What happens if you do this?
function Person() {}
Person.prototype = 7;
var ted = new Person();
Also what happens if you set Person.prototype to an array or function?
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