Difference Between A Function Pointer And A Function Call?
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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Jul 19, 2011
I am trying to call a deactive_tiptip function from tiptip source code when partial updates happened.I want to call that function inside this code
function pageLoad() {
if (Sys.WebForms.PageRequestManager.getInstance().get_isInAsyncPostBack()) {
}
[code]....
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Jul 23, 2005
I have the following code:
var ocevent = function(v)
{
alert('javascript event: u clicked '+v);
return false;
};
var items = {
"002.jpg": {text:"002", href:"#", click:function(){return ocevent(2)} },
"003.jpg": {text:"003", href:"#", click:function(){return ocevent(3)} },
....}
And I use the following code to assign the click property to onclick of
anchor.
a.setAttribute('onclick', items[id].click);
However, the code works well in IE but not in Mozilla Firefox. To test the
code go to:
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Jul 22, 2010
(function($) { /* code*/ })(jQuery);
$
(
document
[code]....
I know that document.read is loaded when html page is been loaded. But what's the difference between the two?
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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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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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Apr 5, 2011
i've written a js function to find the difference between two dates. the format being used is dd/mm/yyyy hh:mm. The function returns correct value when give one set of values, but go wrong with another set. examples are given below.
set 1 : Time 1 = 24/02/2011 09:30 , time 2 = 24/02/2011 16:00
Output is corret here. It gives 6 Hours & 30 Minutes (after converting the difference)
set 2: Time 1 = 24/02/2011 09:30 , time 2 = 25/02/2011 16:00
Here, it gives 31 days, 6 Hours & 30 Minutes. My code is given below. Also the alert of dates display strange values. Don't know if it is timezone issue.
function compareDateTime(frmtime,totime)
{
var date1 = new Date(frmtime);
var date2 = new Date(totime);[code]......
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Aug 21, 2010
I worked on a simple image slide-show with javascript, and I assigned a value to a var outside of a function using getElementById() like this:
Code:
window.onload = initLinks;
myImg = new Array("images/img01.jpg","images/img02.jpg","images/img03.jpg","images/img04.jpg");
curPic = 0;[code]..........
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Jul 30, 2010
is there any real difference between these two function declarations?
function DoSomething(parm) {
//do something here
}[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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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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Dec 21, 2006
My query is very straight forward (I think).
What's the difference between
someFunc.blah = function(){ ; }
and
someFunc.prototype.blah = function(){ ; }
?Does someFunc.blah call upon someFunc.prototype.blah?
Is there any difference?
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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 12, 2010
I am using jquery for getting ajax responses from server side functions.
I am in a situation where I need to make two ajax calls one after another and the second one is dependent on the response of the first one.
I have tried to use a code which is similar to this one?
$.ajax({
type: 'GET',
url: 'myURL',
success: function(data)
[Code]....
Is it possible to get two have two ajax calls , one dependent on the other?
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Oct 22, 2010
On the click of a table row I want to call a function and pass a that particular table row as a table row object to a function. I was wondering how I would do that? And also if I could grab the number of that table row as well.
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Apr 21, 2007
Is there a way of displaying the id of the element under the pointer ?
Please dont ask why I need it, but I do, i found tools that needs
installation that provide the same funcitonality. However, I would
like to turn on this feature using a flag in my url. Something like
debug=1.
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Sep 5, 2010
follow() function that i want to call from another function, won't execute!!, is the only way is "document.onmousemove = follow;" to call follow?
Code:
var divName = 'mydiv';
var offX = 15;
var offY = 15;
[code]....
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