Inheritace And Super.class Calling

Jul 20, 2005

I was wondering whether someone could shed some light on the following.
Using inheritance in Java one can override a function f() (or is it
overload?) in the child and then do:
public f() {
super.f();
...
}
in the child to first execute the parent stuff to be followed by the
additional child stuff.

Is there a way to accomplish this in JS as well and if so how?

I've already figured out the normal inheritance bit and complete
function overriding. I'm just looking for the above case.

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Prototyping Within Library - Extend Or Super-class The Native String Object

Apr 21, 2011

I have a few String prototypes such as String.prototype.EscapeReg = function () { return this.replace(/[-[]{}()*+?.,\^$|#s]/g, "\$&"); }; // Escapes characters for use with a regular expressionI also have my own class/ library which is used like this var adg = new AndyG_ns.ADG_Utils(); adg.StartClock('AndyClock','dd mmm yy hh:nn'); // etc.What I would like to do is to only add the prototype to my library (not to the global namespace). The end result I'm looking for is to use code such as:

var adg = new AndyG_ns.ADG_Utils();
var myString = new adg.AString();
var parsed = myString.EscapeReg();

In addition, I want to be able to also use/create my special string sub-class within my library. I suppose I'm saying that I would like to extend or super-class the native String object.

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Passing Constructor Arguments Between Child And Super "class" Properly

Sep 17, 2011

Code:
function BaseController(el) {
var that = this;
this.defaultAction = function() {

[Code]....

What is the proper method here so that el will be defined in the super "class".? I know I saw something on stack overflow a couple of days ago but can not seem to find it again.

admin: Something is up with the code tags, why the system is double posting the code. Does HIGHLIGHT=JS not exists anymore? – That seemed not be working.

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Aug 23, 2006

Can you call a java class from within a javascript?

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Aug 13, 2007

i've got an object and i'd like to recursively call a function
within the class definition.

(i've simplified the code )

function myclass()
{
this.loop = function(index)
{
// ..work

setTimeout( "loop(" + (index+1) + ")", 100 );
}
}

does not work.

i've also tried

setTimeout( function() { loop(index+1) }, 100 );

i've also prefixed this. to loop in both cases - and no workee.

i think it's some sort of scope problem.

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Jul 2, 2009

Just getting my feet wet with AJAX and trying to figure out how I can make a javascript call to a specific PHP function in another file when I have a drop down menu change value using DOM. I've found lots of examples of how it could be done with GET variables, but none for this particular method of data retrieval. Has anyone ever ran into this, and if so, how did you solve this interesting deliema?

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Prototype __proto__ Super And Delegation

Oct 30, 2007

One thing I haven't figured out about javascript is the treatment of
__proto__.

Inheritence, whether prototypes or class-based, is just a shorthand
form of delegation (leaving aside dynamic dispatch).

In Java a derived class serves as a wrapper for its superclass. The
derived class can easily access members of its super class using the
nice "super" keyword. Why, in javascript, is this functionality buried
in the unofficial "__proto__" property? It seems that it must have
been the intent of the language designer that explicitly accessing the
prototype chain is a bad thing for some reason, although I can't see
any reason.

By googling, you can find a lot of weird hacks to add "super"-like
functionality to javascript, although many of them look misguided to
me. It certainly seems that this is a commonly confusing part of the
language.

If __proto__ were an official part of the language, implementing a
decorator or proxy pattern would be nicely simplified compared to
class-based inheritence. The "before-and-after" style of AOP (which is
just another style of shorthand for delegation) would be possible
without any crazy tricks.

So, anyone care to set me straight? Why isn't __proto__ or something
like it a well defined part of javascript? Shouldn't it be?

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Feb 27, 2011

I tried load method super as smartupdater orPeriodicalUpdater (Prototype). Now the problem is that I have to build a cycle (loop) and each time I have to change the time (that I take from database) so how method (function) can I use to load external code (example load()) modifying continuosly the timeout?

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Jun 3, 2010

My code: [URL]... When I click on Upraviť in class edit I need add some HTML code to begin and to end of class entry how to I can select class entry in the same class post on which I clicked?

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Jul 17, 2011

I have a form button with id="submit". When pressed, ClickGeocode(credentials) is called. This works fine and dandy with: $('submit").click(ClickGeocode) Despite there being no indication that the function takes an argument 'credentials'. So when I want to call the function at some point in my code, I should be able to do something like ClickGeocode(credentials) ... no? However, my issue is that credentials isn't once defined in my code - it is part of Bing Maps function... like so:

function ClickGeocode(credentials)
{
map.getCredentials(MakeGeocodeRequest);
}

So why does it work using .click(), and how can I call the function without user interaction (simply somewhere in my code) even if 'credentials' is not defined?

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JQuery :: Assigning A Click To A Class Selector - Once Clicked The Class Is Removed - Does This Work

May 5, 2011

I have a huge blob of code but the main part I am focusing on is this

$('.billboard_click').click(function () {
//this remove class
$(".billboard_click").removeClass("billboard_click");
});

1. Execute a click event when the div with the class 'billboard_click' is clicked

2. Once clicked, remove the class from that very div to avoid another click from happening

3. Execute a series of events such as animations, etc

4. add the class back to the clicker div

The code does not seem to work as expected but I am wondering if I am having issues elsewhere at this point and wonder if this actually is known to work

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Mar 28, 2010

I'm using jquery to make it easy for AJAX calls.

So I create a class: function cMap(mapID){//vars and stuff}

I go and prototype a function: cMap.prototype.loadMap = function(){ //jquery AJAX call }

Now in the jquery $.ajax({...}); call, I use an anonymous function on the "success:" call: success: function(data){ this.member = data; }

My problem is that inside this anonymous function call I'm trying to call a class member of my cMap class to store the data in from the AJAX call, but it's out of scope. So the JS console in FF/Chrome throws errors about bad value/doesn't exist.

How can I access this class member from inside an anonymous function? Or at least what's a good way to go about doing all this?

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Jul 2, 2009

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clickable function here...

[Code]...

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Sep 27, 2011

CONDITIONS:If a person selects a Friday Class but not a Saturday Class the Total Cost Field will automatically enter $99.If a person selects a Saturday Class but not a Friday Class the Total Cost Field will automatically enter $99 as well.If a person selects both a Friday & Saturday Class the Total Cost field will automatically be $159.I found the following code and so far only have it changing when a Friday class is entered. I have no idea where to go from here

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">

[code].....

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Dec 29, 2011

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Dec 22, 2010

I have this filter in a results table that also reflect in a ui datepicker day styling (ex:available unavailable) . Everything fine till i change month or year in datepicker . Maybe i have to use live() or livequery() but can see the way .This is the code:

$("#filterSelect").change(function(){
var filtro=$("#filterSelect").val();
$("#filter-box2").val(filtro);

[code]....

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Mar 9, 2011

I'm trying to figure out which selector is faster (assuming that the class 'foo' only appears on input tags)...

$('.foo');
or
$('input.foo');

From what I've seen online, it seems that people recommend $('input.foo'), but in some limited testing it appears that $('.foo') is much faster in both FF and Chrome. In IE, both methods seem to produce similar results. Here is a fiddle with a simple example...

[URL]

Have browsers started implementing native ways to find all elements with a given class name? Would that explain why $('.foo') seems to be faster?

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Nov 25, 2010

<input type="text" class="class1">
<input type="text" class="class3">
<input type="text" class="class2">
<input type="text" class="class2 class1">
<input type="text" class="class1 class3">
<input type="text" class="class1">

Given the above, how would I select those that HAVE class1, but NOT class2, don't care about class3

So what I want are the items on lines 1,5 & 6 How could the below be modified to achieve what I want, or do I need something completely different?

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Dec 24, 2011

[URL] The above webpage lists the selector .class.class without an example. I can't find this usage in jQuery document either. I made the following example, but it doesn't work. Could anybody let me know who to use the .class.class selector?

<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>

[code]....

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Sep 15, 2006

I'm currently working with Javascript to build some "dynamic" tabs. Basicly, the tab "onmouseover" and "onmouseout" event have been overriden to change the tab's css class.

Here's the class:

function HtmlTab(id)
{
this.id = id;
this.tab = document.getElementById(id);
this.cssover = "over";
this.cssout = "out";

this.tab.onmouseover = function()
{

this.className = this.cssover; // NOT WORKING
}
this.tab.onmouseout = function()
{
this.className = "gen";
}
}
My problem is, I cannot access my HtmlTab class attributes from the this.tab.onmouseover function.

Anyone knows a way to fix this?

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Feb 2, 2011

I am attempting to make a menu that has a background image that changeswhen you rollover or click a menuitem. I've got the hover effect working fine with CSS, but am trying to implement the click event via jquery with the following:

CSS:
div.SustainResourcesMenuTabs
{ background-image: url('/images/departments/commdev/sustainability/menu_tab.jpg');
}[code]....

My process is to reset the entire menu to the inactive state, then switch on the active state for the item that was clicked. Eventually, the item that was clicked will display its corresponding body section as well. I've tried using the CSS pseudo-class "active", but since the entire div is the link, that is unavailable. I've also tried multiple variations of addClass/removeClass, toggleClass, and setAttribute/removeAttributebut nothing hasworked so far.

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Dec 5, 2009

I have a script that fades links on load and im trying to get this to work on everything but the menu link that has the "active" class

Code:
<div id="menu">
<ul><li id="Home"><a title="Home" href="/" style="opacity: 0.6;">Home</a></li>
<li class="active" id="projects"><a title="projects" href="/projects/" style="opacity: 0.6;">projects</a></li>
<li class="last" id="Contact"><a title="Contact" href="/contact" style="opacity: 0.6;">Contact</a></li>
</ul>
</div>
[Code]...

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May 26, 2010

I just dont know the right syntax for this:

I want to change the css class of the li element from the name hidden to the variable filterVal, but i dont know the right syntax.

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Mar 19, 2009

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Code JavaScript:
$(document).ready(function () {
$("p#jtest a").mouseover(function () {[code].....

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Mar 23, 2011

This is what I'm trying to do: I want a simple image container to swap the image inside it by clicking the nav buttons on the right like 1, 2, 3.Here's my code:

HTML
Code HTML4Strict:
<div id="item1">
<div class="img-container shadow" style="background-image:url(images/gallery/tcg1.jpg)">[code].....

My jQuery code is not right. I want it to turn off the "hover" class and the "show" class of the others when you click one. I think I need some kind of if..else? how to write it? I have a bg image set on the container div so there's an initial image to view.I also need multiple of these on the same page!

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Jul 23, 2005

Im supposed to write an activeX dll that will be called by javascript
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Also I would like to know if it matters if its written in C++ or VB,
and if someone has sample C++ code that does this i will be grateful
to see!

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