JQuery :: Functions With Variable Number Of Arguments?
Jul 26, 2011
So in the Tutorials:How jQuery Works, I've noticed that you can make a call to .get like this : $.get('myhtmlpage.html', myCallBack);
I've also noticed that in the docs jQuery.get() is described as jQuery.get( url, [data,] [success(data, textStatus, jqXHR),] [dataType] ). My question is, in the above example, the callback function is the second argument, whereas in the docs the second argument is data, and the third is the callback function. How does this work? Also, what does it mean when the arguments are laid out in an array-like fashion with commas in the square brackets? i.e. arg1, [arg2,]...
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Oct 20, 2011
need to call two functions say func1(a,b) and func2()i used the following code. But only the first function works, second one not working
Code:
<input type="button" value="Start" onclick="func1('A','B');func2()">
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Jan 29, 2006
I am trying to create a script that will cover cross-browser limitations in adding event listeners to elements. I have found plenty of resources to add a listener but can't find any way of assigning a function containing arguments. Here is what I have so far:
/* Attach events regardless of browser */
function addEvent(obj, evType, fn)
{
if (obj.addEventListener)
{
obj.addEventListener(evType, fn, false);
return true;
}
else if (obj.attachEvent)
{
var r = obj.attachEvent("on"+evType, fn);
return r;
}
else
{
return false;
}}
/* Contains all attachments to be made on page load */
function load()
{
item = document.getElementById('toggleControl');
addEvent(item, 'click', toggle);
item = document.getElementById('alertLink');
addEvent(item, 'click', runAlert);
}
/* Add event to page load and assign load() function */
addEvent(window, 'load', load);
The actual functions for toggle and runAlert are in a seperate .js file, but are standard functions. the problem is that I can't find a way to perform the equivalent of:
item = document.getElementById('toggleControl');
addEvent(item, 'click', toggle('toggleID'));
It simply does not work.
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Feb 12, 2010
I encountered some code in "Javascript the good part" from Douglas Crockford.There is a way to passing callback function as second argument to string.replace() method.
Code:
var entity = {
quot: '"',
lt: '<',
[code]....
1. How do I know what the number of parameters should be in callback function ( function(a,b) ) ?
2. How do I know what will be passed in as a and b when I am defining the callback function?
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Dec 22, 2009
I want to use the new keyword to instantiate an object. The catch is I want to pass in variable length arguments.
Given:
function Foo () {
this.args = Array.prototype.join.call (arguments);
}var args = ["arg0", "arg1", "arg2"];
The following don't work (though I understand why):
new Foo.apply (null, args);
new (Foo.apply (null, args));
(new Foo).apply (null, args);
How to do what I want without modifying Foo's source code?
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May 11, 2011
If you specify arguments when writing a function should you still declare the argument variable inside the function?
example:
Code:
or
Code:
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Oct 13, 2009
a.) specify two parameters for the changeYear function: today and holiday.
function changeYear(today)(holiday){
b.) in the first line of the above function, use the getFullYear() date method to extract the 4-digit value from the today variable and store the value in a variable named year.
first line
c.) in the second line; use the setFullYear() date method to set the full year of the holiday date object to the value of the year variable.
second line
d.) in the third line, use a conditional operator on the year variable. The test condition is whether the value of the holiday date object is less than the today date object. If it is, this means that the event has already passed in the current year and the value of the year variable should be increased by 1.
third line
e.) in the fourth line of the function, again set the full year value of the holiday date object to the value of the year variable.
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Aug 23, 2010
I've recently started developing javascript using jQuery and so far I'm really enjoying it.Being a professional programmer (mainly C, C++, java and python) there is one thing that's been puzzling me regarding variable scope and unnamed function declarations. Let me exemplify:
------------------------
var sum = 0;
$(xmlobj).find("item").each(function(){
[code]....
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Mar 19, 2011
I have got this piece of code:
Code:
I would like to display the number 1 at first and then 2. but this code produces number 2 for both alerts. I was able to achieve what i wanted with "new" constructor when creating functions but this is not a good practice and after all i am passing these functions as an event handlers and it can't be done with "new" keyword because it is throwing error. I think there are some solutions with arrays e.g the x would be an array of numbers, but i don't like it. Am i missing something important?
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Jun 17, 2011
I have a function that I call a variable number of times and I need to know when the calls have *all* been completed. How would I build that? As I understand the deferreds, the $.when syntax is as follows:
$.when(dfrd_func1('a'), dfrd_func2('b'),
dfrd_func3('c')).done( function() {
console.log("All Done");} );
will send "All done" to the console once each of the functions are complete.
So, I have the *same* function that I need to call a variable number of times with different parameters, i.e. :
$.when(dfrd_func('a'), dfrd_func('b'), dfrd_func('c'), ...).done(function() {console.log("All Done")});
So, is my approach wrong? Is there some way to build an array of functions that could be executed?
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Oct 12, 2010
Demonstration code:
The 'array' variable contains strings representing the id's of different elements. If the for loop above were to finish iterating, would all the links in all three elements call the click function (that displays an alert message), or would only the last element ("element3") have the click function? For me, the latter seems to be the case unless if I'm doing something wrong, but I would like clarifications and, if possible, alternative solutions as to how I can achieve the former result.
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Mar 27, 2010
I am trying to pass a variable (which is a number) to the :gt(index) pseudo-selector.var thisParentIndex = $(this).parent().index(); //get the index of parent
console.log(thisParentIndex);
$(this).parent().parent().find('div.line:gt(' + thisParentIndex + ')').hide();
this does not appear to work..
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Aug 11, 2011
<!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>JS: Image Slider</title>
<script type="text/javascript">
[Code]....
My problem is that every other turn I have to click either button twice to start the desired function. Say, I autoplay the images first and I want to shuffle them, I click shuffle and the autoplay stops working and I need to click shuffle again and then the shuffle runs. How can I make it clicked once and the function runs?
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Jun 6, 2009
I have a problem that 'test' is not passed. The following function alert undefined, but it should alert test. Why that?
PHP Code:
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Feb 12, 2010
Is it possible to make a variable available to other functions outside a function So to make it global from within a function without using a callback
function() {
var something = 'hello';
}
function(something) {
document.write(something);
}
something like that possible??
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May 20, 2011
i'm having the following problem, normaly i work with html css and php but for this to work i need to make a litle javascript function and i'm still kinda new to it. so here is my problem.i'm making a search field where someone has to select some radiobuttons.first it has a selection out of 4 items and then a selection out of like 20 but how do i get the value from the first function in the second?in this case i would like to have the following in function showStreek:
xmlhttp.open("GET","test3.php?l="+land,true);
this line should look like:
xmlhttp.open("GET","test3.php?k="+kleur"l="+land,true);
[code]....
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May 28, 2009
I have been having trouble with forms and functions. On my wife's site I have some forms and some of them have radio buttons. My current radio button checker is cumbersome and it is time for something more elegant (some of you will say if it isn't broke don't fix it )
The new code is below:
Code:
Basically I want to pass into the function radio button values 1 & 2 denoted by firstChoice and secondChoice (eventually I want to also pass in the form name but 1 step at a time).
The buttons can have the value (names?) of pattern, chalkboard or kit. It is for a shopping cart (Mal's E-commerce) and this is part of the JS validation. I am using onsubmit to call the function viz.
HTML Code:
Seems ok (to me at least) but when I try to get it to work it throws up an error of
Code:
It stops at that point but undoubtably chalkboard would throw up the same error if it continued.
How would I define the variables in my function? Are they strings, integers, who cares?
Where would I define them? Global or local?
Is the problem a matter of syntax e.g. if I put ' ' or " " around them would that suffice?
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Nov 14, 2005
How can I call functions from the value of a variable?
I do this in PHP, like $variable(); or {$variable . 'CallBack'} or using something like call_user_func().
I've been search all day though, and can't find how to do this in javascript. Is it possible?
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Nov 23, 2005
I am trying to convert some of my javascripts into a class and am
running into difficulties which i think are related to variable scope.
Basically I have a constructor function for a calendarInput class that
takes 4 parameters, the first is a reference name/number for this
input. I also have some functions for importing my PHP classes into
Javascript using AJAX (properties only. still trying to get methods
working but that's another story!). The relevant function is called
call_object_method(classname, methodname, createparams, methodparams,
post, callbackfunction). This creates an instance of the specified PHP
class using the parameters in createparams. It then calls the
specified method using the parameters in methodparams. The result is
passed back to the javascript function specified in the callbackfunction parameter (ie the value of xmlhttp.onreadystatechange is set to callbackfunction before xmlhttp.send() is called)
The function i am trying to fix is called show (x,y) which creates the
html for the calendarInput and displays it at co-ordinates x, y.
So, my code is as follows:
function calendarInput(calendarid, target, displaytarget, value)
{
this.calendarid = calendarid;
this.target = target;
this.displaytarget = displaytarget;
this.value = value;
this.show = function(x, y)
{
<!--// bunch of init and prepping code. includes creating
createparams and methodparams arrays //-->
call_object_method("cms_calendar", "getcalendarview",
createparams, methodparams, false, this.showcallback);
}
this.showcallback = function()
{
alert(this);
<!--//code to create html//-->
}
}
I know i've cut out most of the innards of this. This is because I
have already tested these functions and had the calendarInput working
outside of a class, hence am pretty sure that this is ok (plus it runs
to almost 1000 lines these days!!). My problem is that when I call the
show method, the alert on the first line of the callback function
returns the function showcallback instead of (as i was expecting) the
instance of the calendarInput object. Whilst this kinda makes sense I
can't figure out how to reference the Object instead. I have tried
'this.parent' but this returned undefined. I have tried changing the
way i reference the callback function (ie the final parameter of
call_object_method) but no joy.
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Jul 2, 2010
Is there any way we can watch variable values inside javascript functions while running through the debugger. I am using javascript along with ASP.net on Visual studio 2010.
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Jun 7, 2009
I have a problem that 'test' is not passed. The following function alert undefined, but it should alert test. Why that?
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Jul 25, 2011
I think the last thing people seem to learn about in JavaScript when they're not coming from other programming languages is variable scope. Some even get all the way into AJAX without having learned about scope, and this is a time when it's really needed. Although the scope of JavaScript variables is non-complex by nature, it's something we should all get a full understanding for before we move too far.
Section 1: What is "scope"?
Section 2: The "var" keyword
Section 3: The "this" keyword
Section 4: Closures or "Anonymous functions and self-invoking closures
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Oct 29, 2009
I'm using simpleCart() javascript shopping machine for my page.The script accepts values in a specific syntax:onclick="simpleCart.add('name=Some name','price=23.4','quantity=1');"But because the price of the product is not always the same but comes up after previously made calculations, i want to parse the values in simpleCart() through another function. I have made the following one which gets the price from a textbox (resultAlmires) of a form (Almires), then converts it to american format (. instead of ,) makes it have one decimal only and finally parse it to simpleCart() with the use of a variable.However it doesn't seem to work:
function addAlmiri() {
var timi = document.Almires.resultAlmires.value;
timi = timi.replace(/,/,".");
[code]....
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Nov 8, 2009
FRom this page: [URL]I need to find the VIN number and store it in a variable, however there's no ID located in it, so getelementbyid doesn't work.
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Sep 22, 2010
When I try to add a variable and a number from a textbox they add as strings:
Now when I add number to it I get an error in the page:
I am sure all the other code is correct.
How do you change a variable into a number format?
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Dec 18, 2009
I want to create a script where when you hit a button it adds a number to a variable and when you click another button it shows you the amount you have so far. Also I am having trouble with the clear() function where it was suppose to clear the variable. When my var is equal to a certain number (not there yet) I want it to goto another page (I can do this on my own).
Here is my code
<html><head>
<title> Buttons</title>
<body style="background-color:#000000">
<center>
<p style="Font-Family:Curlz MT;color: #CC3333;Font-size:40px;">Click the buttons to test my script
</p></center>
<script type="text/javascript">
var x = 0;
blue
function mouseOver() {
document.getElementById("b1").src ="Hi_h.png";
} function mouseOut() { .....
(The button are images so you want be able to see them if you don't download them).
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