Call Overridden Function From Parent?
Nov 30, 2011
I want to create a parent class which initialises various stuff and then triggers a 'onStart' function. The idea is that the child classes can then just override this start function and do their thing when everything is initialised.
This is the code I was trying to use but it doesn't work
What I get is the parent start method always being called, not the child one.
I know that using this.onStart is assigning the method to the object not the prototype, so maybe I am mixing my methods here - but I tried it this way and it still doesn't work
What am I doing wrong? Is it not possible for a parent to trigger a method which is subsequently overridden by a child?
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Apr 5, 2006
The challenge is as above really. I have a page with an iframe in it, and need to call a JS function in the *parent* page, *from* inside the iframe.
(It's for Google Maps, but I won't bore you with the complexities of that, as it doesn't affect the question).....
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Jan 18, 2010
I have created and opened a child window called "checkwin" and have written some data to it. If the data is valid, I want the user to click on the 'CONFIRM' button on the child window, at which time I want the "submit()" function for the form on the parent window to be executed. If the data is invalid the user clicks on 'MODIFY' and I want focus to return to a field on the parent form. However, when I click on the "CONFIRM" or "MODIFY" buttons on the child window, nothing happens. Here is the code:
checkwin.document.write("</td></tr><tr><td align='right'><input type='button' value='CONFIRM'
onclick='opener.document.personnel_form.submit()'></td><td></td><td><input type='button' value='MODIFY'
onclick='opener.document.personnel_form.first_name.focus()'></td></tr></table>")
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Feb 11, 2006
<button onClick="return popup('<span onClick='selectShape(1, 1, 1)'>test<span>');" tabindex=Ɖ' onFocus="setFocusColor(0,3)">....</button>
This will work perfectly, but as soon as I need to pass Strings inside the selectShape function, I get stuck.
So the question is, how can I create the following and have it working
......selectShape(2, 'Tricky', ཤx5°').....
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Mar 17, 2010
Alright straight to the point I have a link on the parent page of my site.
<a href="javascript: scontrols.expandit(0)">View Info</a>
I would like to be able to some how call that from the iframe.
I am just getting into java script and haven't been able to figure it out.
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Apr 9, 2009
I have a question about OOP Javascript...
How can you call a parent method from a child object?
for example...
Am i using the right way of making an object? prototypal vs classical?
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Jan 12, 2007
I have some javascript that works in Firefox 2 but not in IE 7. In the
parent page, a user clicks a link and a new window is opened so that
they can maintain some values. When the user is finished, they can
click either a save or a cancel button. If the user clicks the save
button, I want the parent page to be refreshed and then the child
window to close. I have this working perfectly in FF2 but it does not
in IE. In IE, the parent page is refreshed but when it refreshes, the
screen that comes back is the same screen as the child window. When
the child window should close, it instead is being refreshed and comes
back as a blank screen. Code:
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Oct 13, 2011
I have defined a method in an iframe named as refresh1().In the iframe we are showing records in a table.on clicking a record of table or you can say row a showmodal Dialog object will open which shows the info of clicked record.I want to call refresh1() method onclick of save button whic is defined in modal dialog.I have triedparent.window.dialogArguments.refresh1() but it is not workin.
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Nov 2, 2011
I am creating a job ticket object that will interact with a database. It has to update the database on the fly via AJAX. Within the job ticket object, I have instances of a Component Object. Within the Component Object, I have an instance of an Editor Object. One of the methods of the Editor object is a function to edit some text and when it's submitted, it will update the database. All of that is working fine. My problem is that I need to refresh the screen with the new contents of the database. I have a method in the Component Object that refreshes the screen, but how do I call it from within the Editor Object? I believe it has to be called there because the editor object has a handler for the form submission and the AJAX function. So I'll have to reference a callback function once the AJAX request is handled, but I don't know how to call it.
I know that sounds kind of convoluted, so hopefully, this very simplified code will paint a better picture of what I'm trying to do:
Code:
Now I want to call refreshScreen, but I don't know how:
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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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Feb 12, 2010
how I can accomplish wrappingrelevantparts of a script into a function then call that function within a success area on another page.
This is what I have so far: Script.js page - This page is longer but this is the relevant part that I would like to wrap:
$(".product img").draggable({
containment: 'document',
opacity: 0.6,
revert: 'invalid',
[code]....
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Jun 23, 2010
I have just started learning JQuery and have a doubt in the below code. $.get('myhtmlpage.html', myCallBack);The doubt is should the 1st parameter of the get function be a HTML file or can it be a unction name?
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Feb 15, 2012
I want to call java function in javascript.In which we pass one parameter to function and its returns String value which I want to display in alert message.
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Jun 11, 2011
I have a real perplexing issue. In two separate "projects" I had code that displayed checkboxes - when clicked, they would fetch information from a db and display it in the div below. I had code that displayed a jquery date-picker - when clicked, it would fetch information from a db and display it in the div below. My issue comes with this:
[Code]...
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Oct 16, 2006
I have a document that can contain any number of iframes which have
further copies of the same document (and so on). In practice, we
shouldn't ever have frames within frames, but I'd like to make the
implementation a general case.
Various of the functions in the parent document need to call themselves
in the child documents with the same parameters as they've just been
passed.
Now, I can stick a loop in each function that goes throught the
window.frames array and calls the function for each frame, but for I'd
like to write a function to do this.
It's at this point that my brain explodes. If I limit it to a single
parameter we can do:
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Apr 22, 2009
I'm in the middle of a JavaScript class, and I've run into a problem with one assignment. ^^; I've been given a pre-written script and HTML code to work with, and am required to modify it. Here's one thing I have to do, via my instructor:
Add an "email" field to this form. This field should also validate as a valid email address. (Hint: after adding the form field to the form itself, your next step will be to expand the function named submitIt() by adding a second if statement to confirm the contents of the email field. You will want to paste into the header and use the validEmail() function which you will find in Script 7.15, highlighted in red on pages 192-3 of your textbook.)
I know how to write the code to validate an email address, but I can't figure out how to call the validEmail() function in the submitIt() function. The code I have now just blanks out all the fields when I hit "submit." Here's the part of the script with the email validation:
window.onload = loadDoc;
function loadDoc() {
resetForm(document.forms[0]);
[code].....
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Mar 20, 2010
<html>
<head>
<title>TESTING</title>
<script type="text/javascript">
[code]....
This is a very basic version of what I am trying to do. I have a dynamic list which is set in a table. When clicked, a function is run to set up a new list.. The reason I explain that, is that I need to keep it dynamic.Now for the problem:When I run this page, I have the button made right away, then when clicked it creates the new button. The new button should also run the function to create the new button again, but when I click it, I only receive "error on page".
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Feb 14, 2011
I'm trying to "progressively enhance" one of my surveys using javascript. Basically, I have rating scales that make use of radio buttons as each point on the scale. Each radio button occupies its own cell in a table. I wrote some functions that will highlight cells on mouseover in a color corresponding to its position on the scale (e.g. the lowest point is red, the midpoint is yellow, the highest point is green). When a radio button is clicked, the background of the button's cell and preceding cells in the same row will be colored accordingly. The functions are working well in FireFox and Chrome (I just have to add a few lines using the addEvent function to make it compatible with IE).
The effect looks a lot nicer when I add a function that makes the visibility of the radio buttons hidden.
However, I want to make sure that there is a fallback option in case the functions that color the cells don't work for whatever reason. I would not want the radio buttons hidden in this case.
Is there a method whereby I can call the "hideRadiobuttons" function only if the other functions are successfully executed?
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May 13, 2011
I am creating a little word guess game, with a random function which picks the word from an array of 10 words. The second function checks if the users' letter choice is part of the secret word. Currently, each time the checkGuess() function is called, the word is changed, probably because I am calling the wordPicker() function from within. The wordPicker randomly chooses the word, then returns that word. All I want to do is pull that word into the checkGuess function, without calling the wordPicker function as it currently does. Here is the code:
Create secret word array
var wordList = new Array("stealth", "telephone", "internet", "nickel", "marine", "instantiate", "method", "function", "television", "monitor")
[Code]....
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Mar 11, 2011
I'm working through the sitepoint ajax book and had a problem with a particular chunk of code. I eventually tracked down the error and it was being caused because I had:
window.onload = Monitor.init();
instead of:
window.onload = Monitor.init;
Now, one of the sticky threads mentioned that the first is a function call and the second is a function pointer. My questions are:What's the difference between a function call and a function pointer? Why did it cause problems in this particular case? What are the general implications/issues with using one over the other?
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Aug 25, 2006
Is this correct? The following three lines are equivalent, for
example, [1] can be replaced with [2] or [3] anywhere in a script
without changing the return value and without changing any side effect.
[1] var r = o.f(a,b);
[2] var r = o.f.call(o,a,b);
[3] var r = o.f.apply(o,[a,b]);
( o is an object and o.f is a function. )
The following three lines are equivalent:
[1'] var r = g(a,b);
[2'] var r = g.call(this,a,b);
[3'] var r = g.apply(this,[a,b]);
( g is a function, for example,
var g = function(a,b){return [this,a,b];}. )
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Oct 11, 2006
How do you call a function within an implementation that's in this form:
(function () {
var G_vmlCanvasManager_ = {
init: function() {
...
},
initElement: function (el) {
...
}
...
})();
I'm trying to call the initElement function that's within excanvas.js
which its comment says is public.
If I try calling initElement(c) or G_vmlCanvasManager_.initElement(c) IE
gives errors.
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Jul 12, 2010
I am slightly confused, usually I can just find the answer from digging around the net and experminting but not this time! [code]...
I know the problem - I am inside another function which has become the new 'this' but how do I get back to the parent 'this' selector.
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Jul 20, 2005
To validate that a function exists on the page, one must simply use the
syntax:
if ( window.funcName ) //...
However, the same syntax does not seem to work when attempting to validate
that a function exists on a parent window of a popup.
if ( window.opener.funcName ) //...
Is there a syntax that works for this?
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Jan 9, 2010
Is it possible to trigger a function in a parent page from a window spawned from that page?
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Jun 10, 2011
proper way to execute helloThere() from the parent function getHelloThere()? This code is not working for me...
index.html
--------------
<script>
function getHelloThere()[code].....
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