I am a little confused how the memory for objects is allocated in
JavaScript. David Flanagan, in "javascript: The Definitive Guide,"
states that each property of a class takes up memory space when
instantiated. So space is created for aMethod three times in this
example: Code:
I'm writing a very complex javascript application and I'd like memory usage to be as low as possible, so I've got a question about objects.
I'm using jQuery and my code is a bunch of jQuery plugins that interact with eachother. Will there be a difference in memory usage if I declare functions like this:
I haven't written anything in javascript as complex as I'm about to write, so I never worked with objects. As far as I understand, $.fn.whatever will add function to prototype, while $.whatever will add function only to one entry of jQuery object.
So question comes down to this: when jQuery object is being created, are functions in it being copied (meaning increase in memory usage) or does javascript only make references (meaning no significant increase in memory usage) to one main entry of that function in prototype?
I have a page that dynamically loads and unloads whole sections and creates complex links between various objects and have never been sure exactly what happens when an object that is being observed is deleted from the DOM. Since there is no longer any link to deleted objects, the listener objects obviously won't receive any updates, but do the underlying "listener" connections get purged as well? I guess it would depend on whether the listening mechanism is part of the listened-to object or is maintained in a separate area of the browser.
View 1 Replies View RelatedI am pretty excited in creating multiple methods within a single plugin. But how do we access a particular set of objects from any given method? Here is what I have so far and all i want to do is access the objects 'location' and 'background' when the DOM is ready...
*jquery plugin*/
(function($){
//call multiple functions inside of one large plugin that do different things!
var methods = {
[Code].....
I have a set of functions that will transition/fade photos in and out as background images. Easy. But now I would like to run the same functions on a different html page with different photos (each different page represents a different JavaScript array).
I've been reading online on how jQuery methods can be called into functions. So my thought process is to create 2 methods (1 for the original images and the 2nd method for the other images).
So here is my base code which works...
$.landingpage = function() {
/*Enable background image cycles on landing page*/
var images=new Array('/image01.jpg','/image02.jpg');
var nextimage=0;
[Code]....
First the code:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8"/>
<title></title>
<script type="text/javascript">
function TextScroll(scrollname, div_name, up_name, down_name, top_name){
[Code]...
When I use mouse wheel in Firefox to scroll contents of the DIV, memory usage in Firefox goes through the roof. Code above is a fully working page, if anyone would like to see what's up, just load it up, and start moving your mouse wheel in the area with text. You don't actually have to scroll the text, just moving the wheel back and forth in that DIV will do. Memory usage will start going up quite fast, and after you stop moving the wheel, it will finally come down a bit after a short while. I've highlighted in red the line where mousewheel event is registered for Firefox. I'm not sure if it's really a problem, but since Opera and IE don't have any strange memory usage, and Firefox does, maybe I did something wrong. In everyday use it shouldn't matter [don't expect to have kilometers of content to scroll], but anyway, it is a bit unsettling.
for example:the callback in jQuery.map( array, callback(elementOfArray, indexInArray) ) and the callback in
jQuery.each( collection, callback(indexInArray, valueOfElement) ) Look similar but the parameters are reversed Why not make a uniformstandard
with HTML/Java Script source code for the Task below[URL]
View 1 Replies View RelatedIs there a way in Javascript or Jquery to return an array of all objects underneath a certain point, ie. the mouse position. Basically, I have a series of images which link to various web pages but I have a large semi transparent image positioned over the top of the other images. I want to find the href of the background image that the mouse pointer clicks over.
View 1 Replies View RelatedIs there a better way to extend object with internal objects?
$.fn.bestShow = function(s) {
var d = {
width: 0,
height: 0,
order: "numeric",
orderBy: "",
[Code]...
I have a form i submit to an email, but i have javascript requirements.
All fields have to be filled, except for email and telephone. There Telephone or email need to be filled.
[url]
I thought of this but its not working
I have this hosting application on my website and people just seem oblivious to the fact that right next to the password input it says: "requires one uppercase letter, one lowercase letter, and one number"
I've tried to take the time before to locate a script, but I've never found a good enough tutorial.
I need help with this code. its a counter.
var count= 0
function onm() {
atextbox.value=ffee
count++
setTimeout(onm(),100)
}
And in the body:
<body onload="onm()">
<input type="text" value="0" name="atextbox">
</body>
I get always an error: Out of memory
I've been putting together a small pet project. Once it was finished i realised it had a gigantic memory leak inside of it. I tried to read up on the subject, but couldn't find the source of the problem via the articals.
This site is very simple, so I'd think idenifying (and hopefully fixing) the problem would be easy. Here is the relavent portions of JS (followed by links to the full page incase you need to see that): Code:
I was wondering how good is JavaScript with memory management. I have
an object called MANAGER that has a list of other objects, each one
managing a single DOM nodes, etc. In my implementation of
MANAGER.reset(), I simply recreate my MANAGER.object_list = new
object(); and do a single MANAGER.domnode.innerHTML = '' as apposed to
getting my hands dirty. Is my app leaking memory?
Internet Explorer leaks memory when I update a div container using
innerHTML, this does not occur in firefox. This would not be a problem
except the webpage is required to be left on for weeks on end without
being restarted. I presume the issue with innerHTML is that Internet
Explorer apparently parses what you give it and then decides on how to
construct the dom elements itself, so never truely creates what you
give it.
I know that the innerHTML is the problem as I have successfully
narrowed down the leak to that line. It only leaks memory when I assign
content to the innerHTML of my containing DIV. Appending a text node,
for example, with the exact same information to the same div does not
leak. Note I have also tried using such existing AJAX packages like
Prototype etc. but to no avail.
I need to do it this way as my XML documents are styled using an XSL
stylesheet and then transformed using transformNode [I will omit
details regarding firefox as there is no problem there]. I have looked
into transformNodeToObject as a way to get a dom object that I
originally assumed could be appended [as a child] to my containing
element. This did not work and gave me compatibility errors.
I suppose I am either looking for someone who has solved this problem,
or who has an acceptable work around. Or someone to say that it cannot
be solved.
I am using javascript to load and parse a big xml file (around 1 mb) save some values to an array and draw a picture using google Flot. Unfortunately, this causes the browser to crash! Is there a way to clear the memory of the browser?
View 2 Replies View RelatedI am developing a simple image editor in an HTA (for a special use-case). Because it is an HTA, it runs in IE only (IE7 to be precise).
Everything is working great so far, however, because I am loading the same img src file over after every edit, I had to attach " + Math.random();" to the image src so that the updated image is displayed.
This has lead to some pretty severe memory issues, as each time I make an edit, it caches another image. Under normal operation, my app uses under 20MB with a single image loaded, however after every edit it adds about 3MB. After a few minutes of testing I have had it consuming over 200MB!
Is there another way to use the same file name, same image src, etc, but have the browser re-read the file before displaying it again rather than using a cached copy.
Alternately, is there a way to make the browser forget about the other copies it has in memory to keep memory usage under control.
I'm trying to make a calculator in HTML/Javascript but I'm having trouble with the memory buttons. Here is the code:
<html>
<head>
<title>Env X Software | Env X Online Calc</title>
[code]....
what is DOM maximum memory size? is Diff from browser to Browser?
View 1 Replies View Relatedtake a look at the below code. The below code is small representation of a bigger system.
HTML Code:
<html>
<head>
<style type="text/css">
</style>
[Code]...
However the problem is that once the tabs/iframes are removed the browser does not release the memory. This happens both in IE8 and FireFox. So over a period of time the memory consumed by the browsers are huge because of the creation and deletion of new tabs/iframes and the application slows down. Is there a way to make the browser release memory when an iframe is removed.
Do the latest browsers still need this? I could find an article about IE8 which states that its garbage collection has improved so circular references shouldn't be a big problem any more.Reason for asking is that I maintain an JavaScript / AJAX framework and we are currently optimizing our code which contains a lot of code to remove references from and to the DOM and to remove event listeners.
View 1 Replies View RelatedWhat is the best way to prevent memory leaks in IE6 and IE7?
I'm working on an internal web app that just gets slower and slower, using more and more CPU load and memory, unless and until you close the browser and start, again.
I want to get the physical memory status, say, the total amount of
physical memory, the free memory, and so on, from the javascript, is it
a mission impossible?
Below is my code which refreshes every 10 seconds
[Code]...
What happens there is a memory leak of the divs with idsliveAuthen-target-1000 andliveAuthen-content-1000
It is possible to remove a function from the memory? I have a custom function that I call usingmodul.StepGuide.init() - but how do I remove that function with all its vars and events, from the memory.
View 1 Replies View Related