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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Jul 20, 2005
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:
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Jan 2, 2011
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?
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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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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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Nov 15, 2011
I have the following html for simplemodal
For the following html
Where {{term.pk}} is different for similar items. I want to pass the value of {{term}} to the code used by simple modal
How do I pass this parameter to my html code using simplemodal?
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Jul 19, 2001
What I want is a loop that will call the same function until it reaches a certain number (let's say 10). Then I want the function to take the parameter passed (the number) and use it in the function where ever you see a 1 below. Basically I want it to run on each element of the pub_name array and from the info gathered define a variable based on the number (example: display_pub_name_*). I have run some tests .....
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Jun 27, 2011
I'm having problems when passing and element from HTML to a script. I have several rows for a person addresses and when one of those fields change I need to update the value of a flag (that is a hidden element).
The html looks like:
<input name="n_address_id[]" value="179" type="hidden">
<input name="c_chg[]" value="0" type="hidden">
<input name="c_street[]" onchange="UpdateValue('c_chg[]')" type="text" value="Street name 1">
[Code].....
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Aug 2, 2010
I'm trying to create links that onclick sort a table by title, author, etc. How would I pass an argument to an event handler? Right now, it just executes the sort function. It doesn't wait for me to click the link.
[Code]...
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Jan 8, 2007
Is there a way to pass arguments to the callback function used inside an addEventListener? I see that I can only list the name of the callback function. For eg, I use this:
var boldLink=document.getElementById('cmtbold');
boldLink.addEventListener("click", rBold, true);
I need the id of boldLink to be accessible from inside the function
rBold()
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Jul 6, 2010
[URL] why the 4th elements are getting selected by
$(".entry-summary:nth-child(5n)").addClass("last");
You can try the following code in Firebug console to debug:
$('.entry-summary').removeClass('last');
$('.entry-summary:nth-child(5n)').addClass('last');
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Oct 2, 2009
<div>I have a bunch of ajax events that are fired one after an other to fill different spots on the page.Hence it's important that I know which dom element each on of the resulting data is supposed to belong to.</div> <div> </div><div>I was wondering if there is a way I can pass the id of each element into the call so that it gets returned automagically without any intervention by the server?</div><div> </div><div>In YUI I can pass any number of arguments to an axax call and these areguments are available as part of the response.</div>
[Code]...
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Jan 14, 2010
Code:
<div onclick="alert('<');" > click 1 </div>
<div onclick="alert('<');" > click 2 </div>
edited: the first alert has this in the brackets: &l t; i.e. the html code for < but for some reason this foum converts it. and i thought html was off?
I was expecting the above to alert the text in the brackets exactly as written in the code for both divs. However both events alert '<'. Why is that? I want to be able to pass '<' as an agrument to events without being converted, because that is what is happening. How may I prevent it?
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Sep 8, 2009
Here's something that I tested without the PHP and it worked ok. Now that I've introduced the PHP to the document it doesn't work. The PHP variable is not passing to Javascript properly. By use of some cleverly placed alert boxes, I figured out that the only thing that is getting passed forward is something called : "object HTML ImageElement"
Specifically, I assign the element ID the unique ID number of the record in the SQL database. The problem isn't with the ID numbers themselves: They are alphanumeric and unique.I think it boils down to one of two lines of code. Either this isn't working (about line 12)
function expander(RecordID){
or perhaps it is when I am calling the function (about line 66):
echo "<img id='".$row['IDNumber']."' src=".$row['ImagePath']." width='5%' onMouseOver='expander(".$row['IDNumber'].");' onMouseOut='shrinker(".$row['IDNumber'].");'>";}
The PHP works (I can get the images to appear, so the connection to SQL and such isn't a problem). I am sure most of the JavaScript is good, too, as I said I had it all working prior to dropping in the PHP.Since I am not going from JavaScript to PHP I don't think I need AJAX. I just need the PHP to pass to JavaScript.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">[code]....
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Aug 11, 2011
I tried implementing a cleaner approach to a web form I had created, but it doesn't seem to be passing the values to the server properly. This form on the left and right work perfectly, but they have two ridiculously long drop down lists, which would be the "ProgramOfInterest" fields [URL] On this form, I tried creating a triple drop down list setup to clean up the older, long lists in this example, but it doesn't pass the values properly. It also seems to not duplicate the new drop down triple drop lists properly as in the original form. You can change the values in the drop downs in the forms to see what I mean. Also just pick Bachelor's > B_Business > Business Administration in the triple drop downs for an example since I don't know how to preselect those values.
[URL]
This is the triple drop down script I am using:
<script type="text/javascript">
/*
Triple Combo Script Credit
[code]....
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Mar 23, 2006
I have a parent page who allows user to view an invoice for service. My page bases the date and the value for payment to <%now%> and to <%total_price%>.
However I'd like to permit for users to editing those two fields by opeing a popup window with a new form and asking for these two new inputs. Afterward off corse, this values need to populate the equivalent fields on the parent page.
My questions:
1)I'm opening the new window after a js confirm instead of href or onclick methods, so I don't know how to pass the parent variable ID to the child window..
The code:
if (confirmation) {return true;}else{popupwindow("invoice_editing.asp?ID="id"");}
Problem:
the parentID=request.querystring ("ID") don't work
2)My child window picks the new values from the form... but I don know how to pass back the new values to the parent page and then reload it..
Please, but as much specific as you can to my problems and also please put the whole code of proposed solution, since I'm totally lost.
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Dec 5, 2006
Passing value from parent to child window created by Pop up.
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Sep 28, 2006
I am trying to pass user data from a parent window to a child window. I read somewhere that if i want to pass data as soon as child window opens i need to add a pause for the form elements to load. I am using the code snippet below.objf.form_parent.text1 is a text field in the parent window and newWindow.document.test.text1. is a field in child window. Can anyone help what I am doing wrong. Code:
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May 25, 2010
In javascript I need to pass a variable or function or something from the parent window to the child window. There will be a URL in the parent that needs to be passed into the child so when you click on the link in the child window it pulls in the link from the parent's js. Like this (ignore my rubbish javascript as I'm just writing it to explain my point!)...
Parent window var variableName="http://www.google.com" (send variable to child window)
Child window (pick up variable from parent window and drop it into the link's URL)
<a href="(variableName);">google</a>
This might seem like a crazy way of doing things but it's totally neccasery in the project I'm working on for various reasons.
Not sure if its a variable it needs but either way it needs to be in the js somewhere in the parent and the child needs to read it within the link. Everywhere I've looked on the internet shows how to do this with forms etc but I can't make it work for a URL.
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Mar 12, 2010
I am opening a pop up in a new window (window.open) . I have no control on the code of the pop up. Its a third party pop up (twitter). Now that generates a callback url and I can specify that.My problem is the callback page is loaded on the pop up window. I want that window to close and have the call back page loaded on the parent window.
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Mar 3, 2010
I have little bizarre problem. Working in Java web development we have project that we use plenty of templates from Velocity. Where one template can refresh section of it self and display one or more templates. My problems is that in parent template I have to pop up window with message if in child template and item from group A been moved to group B or vice-versa. How to change on child template can be propagated up to parent?
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Aug 19, 2011
im experiencing a problem when using the :nth-child() selector.
I currently have a div that contains multiple divs. These divs have either the class 'labels' or 'labels-alt', I currently use the following code to change add/remove a class to one of these
function mOver1(n) {
$('.labels:nth-child('+n+')').toggleClass("labels-hover");
}
function mOut1(n) {
[Code]....
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Oct 29, 2010
I'm having an issue I was hoping someone could help me with. I'm very new to jquery and just picking it up as I go. I'm trying to display the first 10 table rows with a certain class. The rows with this specific class(.filtered) are not ordered in any way. Basically I have a loop which runs through 10 times, and in that loop I'm trying to say "display the [i]th table result where class = filtered" so at the end of the loop, I will have 10 rows, all with the class .filtered. Here's what I have, but I'm fairly sure my syntax is wrong.[URL]..
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Apr 15, 2011
What is the syntax for accessing the children of a class, where the class is a variable?The html structure is multiple divs like this:
<div class="class1 class2 class3">
<p class="x"> lorem</p>
<p class="y"> ipsum</p>
<p class="z"> yadda</p>
</div>
(There's a structural reason for accessing the child <p> tags, rather than just the parent <div>s. Some <p> tags in some<div>swill have previously had a style change applied: if the changes are now applied only to the parents, some children won't change… at least not till they're hidden).Anyway: this code doesn't work, doesn't generate a FF error message, and doesn't stop subsequent chained functions from operating. So it can't be far off; and the syntax$(cl + ' > p') works ok in another function.
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Sep 6, 2011
I've been fiddling around with a bit of javascript in a chrome extension - something to alter the Google buzz webpage.I'm trying to find each individual post basically and have the following:
var entry =$('.X0POSb'); //This main block contains the bulk of Google buzz content
console.log(entry);
var items = entry.find('.G3.G2');
[code]...
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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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