Local Variable In Multi Functions?
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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Jun 2, 2011
for some time I always found a workaround for this kind of problem. But somwhow, it feels wrong. So I'd like to know, if there's a common way to solve something like this[code]...
I'm defining the function and if the value of 'obj' hasn't until the function really gets called, this can work. But it just feels so wrong do have always global variables just to access them inside of a callback.[code]...
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Sep 16, 2010
I have a database which writes to a webpage. The html has one field showing called client_userid with an id of client (see below)
<tr><td>
<span id="client"><WebObject name=client_userid></WebObject></span>
</td></tr>
The value returned in the table is a 7 digit number eg: 1234567 This web view may have one, a few or a thousand records showing depending on the search criteria. For the life of me I cannot find a script that will pass all returned field values to an array that will allow me to remove duplicates and add a hotlink to the individual number and showing the result in a new view of the original table.
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Jan 19, 2010
PHP Code:
<script type="text/javascript" src="sylvester.js"></script>
<script type="text/javascript">
var M = $M([
<?php
[Code].....
I need to build a 100x100 array. I'm using the sylvester plug-in to make a matrix. The code executes fine and when i go view source from the browser the 100 rows and columns are defined just fine. I think that the document is first loaded then the php loops are executed on the server. Is there any way i can load a multi-dimensional array with PHP. I must do it that way, cause later i'll need to query the databases in the loops above.
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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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Feb 16, 2010
I'm using ajax to grab a response from a PHP page, on success, the ajax sets a variable. After the line that calls the ajax function is the line the returns the variable (a global variable). Problem is, because the variable is returned right after the ajax function is fired, it doesn't give the ajax enough time to set the variable. The work around I've thought about would be using the ajax function as a variable, and returning that variable in the initial return line.
Here's some code for reference:
The function that will return the response I'm trying to collect:
The ajax code:
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Nov 17, 2006
I'm looking for a way to define a function that's only effective inside
specified function.
Featurewise, here's what I want to do:
bar_plugin_func = function() { ...; setTimeout(...); ... };
wrap_func(bar_plugin_func);
bar_plugin_func(); // calls custom "setTimeout"
So while plugin developer thinks s/he's calling top-level function,
I want to hook it by somehow injecting local variable with the same
name.
Simply doing something like
;(function() { setTimeout = function() { ...my custom implementation
})();
is not ideal, as that'll taint global scope. Actually, I can live with
that for now,
but it's my technical interest to find a way to define it locally.
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Jan 3, 2010
function test() {
var DIV = document.createElement('DIV');
}
If I never insert DIV to any node its parentNode is null and being a local variuable it's reference is lost.Is it destroyed?or do I have to add it to a node then use removeChild?
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Dec 25, 2010
how to get a js variable later in the html......My page is here: [URL]I want to access the 'selected' variable from the function in <head> later in the page, to complete a form:
<script language="JavaScript">
document.write('<INPUT TYPE="hidden" name="selected" value="'+selected+'">');
</script>
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Dec 11, 2011
I want to modify a local variable of the ready function set like so:
$(function () {
var modifyme = 0;
...
});
I cant change the code setting the ready function, as I am writing only a greasemonkey userscript. I already tried using the .data("events") method, but it never listed the "ready" event. Any function so I can modify the variable!
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Feb 25, 2011
How to: pass local variable from <head> JS function to <body> textarea
I have a JS function in the head that calculates a variable. the function is triggered by the vevent of a button click. when calculation is done, how is it sent back to the page and placed in a textarea or textbox?
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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 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 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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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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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 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 23, 2010
I am using Ben Alman's JQuery resize plugin in order to obtain the varying computed width of an element when the window is resized (the element in question is a page wrapper that exhibits the expand-to-fit behavior of a block box, and it's computed width is obviously influenced by the resizing of the window. Essentially, what I need to be able to do, is to reference a variable that is defined in a .resize() function ('width_page') in a seperate .each() function.
[Code]...
I now understand that variables can't cross boundaries like in the example above, which leaves me a little stuck. I also understand that this is specific to the context of the .resize() function, and that it can't be taken out of it without using an element selector. Is there some way I can call the .resize() function in my .each() function?
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Aug 20, 2009
I have written a number of functions designed to return frequency data on 1000 randomly chosen numbers using different math functions for the rounding. I would like to include all of these functions within the wrapper of another function so that only one call is needed to get returns from all of the 'inner' functions. However, while each of the functions works in isolation, the moment I wrap them in another function they stop working. :confused:
The following code is one of the functions 'frequencyWrapperOne' that has been wrapped in the function 'testWrapper'. A call to testWrapper does nothing.
function testWrapper()
{
function frequencyWrapperOne()
{
[Code]....
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Apr 23, 2011
$(something).split(something),this is a function with a function as a property for that function.
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