Variable Scope And Crossing Functions - Resize Plugin In Order To Obtain The Varying Computed Width Of An Element When The Window Is Resized
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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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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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 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 28, 2010
Im using the cycle plugin trying to make a banner slide tha is 100% the width of the window, my problem is that when i resize de window the banner does not align center, it stays somo what left align. So is there a way to keep the slides align center after you resize the window usingthe cycle plugin? or is there another plugin that i can do that? I attached a image to ilustrate, the white banner with the cat should align center when i resize the windows but it stays left align.
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May 5, 2010
I currently have a website where i share thoughts with my friends (some kind of forum) and within this 'forum' people can post pictures they made but most of the time these pictures exceed the max width of my website so my website gets all streched out!So this is what i want: all images on the page must run thru some sort of function which checks if the image image width exceeds the max_width. if it does then the script must calculate how many pixels the current width exceeds the max_width and get this number so that the script does: current_width = current_width - (max_width - current_width)
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May 5, 2010
My understanding had been that $.css("width") would return the original user selected style, eg "100%" or "10em", and $.width() returned the computed width, always in "px". Not so, following the code through for .css(), it calls something called getComputedStyle and the only difference between the two functions turns out to be a post-fix of "px" on the .css() result - not very useful. I need to know whether my user has called me with a proportional dimension, or a fixed one. How to tell with jQuery?
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May 31, 2011
I'm trying to develop a function to resize a control upon window resize. In regular javascript I would make a global array of control names and append code to the event that cycles through and resizes each control.For example
var proportionalizedImages=new Array();
proportionalizedImages.push(document.getElementById(ctrl));
if (window.addEventListener)[code]....
I'm wondering if there's a more elegant way to do this in jQuery. I've played around with it a bit, but i'm unsure how to get the control object to the resize function triggered by window resize without a global variable.
jQuery.fn.resize = function(max_size) {
$(window).bind('resize', $(this), resizeTriggered);
}[code]....
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Jan 4, 2011
Applied this:
[Code]...
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Jan 8, 2011
I'm trying to build a background in two parts. The header bg is in the body and the lower part is a div with a gradient background color generated by CSS3 or IE filters. I had problems with getting the gradient to stretch all the way to the side in IE7 with plain CSS so I had to start looking for more watertight solutions.
[Code]...
If there are easier methods to solve this split background thing than JavaScript, I'm all ears. I can PM the address of the website, if someone wants to take a look.
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Dec 7, 2011
I have been able to piece together some code for a stopwatch. I have everything the way I want it in regards to the function and look of the stopwatch, but I want to be able to set timers so that the ss() function in the code below will go and stop automatically at intervals I can set.
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>Test</title>
<script type="text/javascript">
[Code]....
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Aug 9, 2011
I have a site that I'm building at [URL] which use the jquery cycle plugin for a slideshow. I won't post the code here because it's all there with view source at the above address. It's a work in progress. The slideshow is full width (the images in it are actually 2000px wide but looks full width), and works fine apart from when the browser window is resized. This is most noticable when you start with a smaller browser window and then resize it to be bigger.
The slides stay the same width as when the page loaded - I need them to adapt to the new width. I need the slideshow to be centered at all widths, so I've put the images in as backgrounds to divs with center positioning on them. I've tried getting the window width on resize and then applying it to the slides using jQuery, but the original calculated size overrides it when the slide changes.
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Oct 17, 2009
I didn't see this as an option, so I decided to give it a try on my own. I was able to add some lines of code (shown with the > in the margin below) to the jquery.cycle.js script to read in the width of each image and center the slide within the slideshow container // set position and zIndex on all the slides
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Aug 7, 2011
I'm a new Javascript coder; it's still pretty easy for me to get snagged on stuff. Anyways, I had a question for a specific project I've been trying to figure out.
I have an element set with CSS to a width of 160px. What I want is a way for users to the site to drag a slider back and forth to set the width of the button. Some sort of smooth animation while this is happening would also be nice. I'd also like a way to set a max width on the element.
So, can this be done? I'm guessing it would use jQuery, but I don't really know.
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Dec 21, 2010
I want to submit a form but it requires a code that is generated by every session (not the php session type). What i'm looking for is for a piece of code that fetch the session code and set it as a variable that can be called in JS.
I know that exists in PHP the cURL that it's able to retrieve the code and set it but i don't know how to start...
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Jul 12, 2009
I'm trying to learn more about creating and using JavaScript objects and ran into this situation the other day:
Code:
function someObject() {
var size = "large";
[code]....
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Mar 31, 2011
soloution that will enable me to set a divs min-height to 350px then when the window is resized it will increase over that 350 this supose to allow people with larger resoloutions to see more of the content.
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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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Aug 29, 2010
How can to obtain length of string variable, for example if I have:
var msg = 'hello world!';
Does it exist a method to count string characters?
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Jan 4, 2008
I am working on a firefox extension. The job is to sit in the status bar and as I type into any form on any webpage, listen for keyboard events, then modify the key pressed by mapping it to some foreign unicode character and then sending it to the form in focus.
As I see it, there are two ways I can achieve it.
1) Capture the event, modify it and then send it and not be concerned with the form in focus.
2) Capture the event, prevent default action., find a unicode mapping for the key pressed, find the form in focus and based on the type of form, call a method to explicitly insert the mapped character at the cursor position.
Right now I am not able to find a way to do either. Once I get the focused element, I can do something to it. But I am not yet able to get that. I even tried document.activeElement, but it doesnt seem to work in firefox.
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May 15, 2011
I'm looking for a resize function that will resize a window around content, in my case a div.
I've googled away but not come up with anything as yet so would like to ask if anyone knows a plug in that can do this simple task.
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Jul 20, 2005
If I do . . .
myForm=document.tstForm;
function initialSetup(){
myForm.fld01.value="Test 01"
myForm.fld02.value="Test 02";
myForm.fld01.focus();
}
Then, in the body tag, I do onLoad="initialSetup()",
the script doesn't work and I get a "myForm has no properties" error
I know it'll work if I move it within the function, but I figured a
global variable would retain its value within the function. Why not?
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Nov 19, 2011
I'm trying to scale the text with the size of the window (I've also got all the layout sizes in ems, so this should keep the aspect ratio of everything the same as the window is resized). The code that I've got at the moment doesn't do anything -
$(window).resize(function() {
var $width = $window.width() / 10;
$("body").css("font-size", $width);
});
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Jul 23, 2005
Given the following working code:
function attributes() {
var attr1 = arguments[0] || '_'
var attr2 = arguments[1] || '_'
return (
function (el1, el2) {
var value1 = el1[attr1] + el1[attr2];
var value2 = el2[attr1] + el2[attr2];
if (value1 > value2) return 1;
else if (value1 < value2) return -1;
else return 0;
}
);
}
var a = [
{ a:'smith', b:'john' },
{ a:'jones', b:'bob' },
{ a:'smith', b:'jane' }
];
a.sort(attributes('a', 'b'));
for (var i =0; i < a.length; i++) {
document.write(a[i].a + ', ' + a[i].b + '<br>');
}
My question is, are attr1 and attr2 guaranteed to exist through
the lifetime of a.sort(attributes('a', 'b'))?
As I understand it, the anonymous inner function reference I am
returning is a property of attributes(). As such, when I return a
reference to the anonymous inner function, the outer attributes()
function must continue to exist (as must attr1 and att2) until
there are no further references to the inner anonymous function.
As a result, there is no danger of attr1 or attr2 "disappearing"
during the repeated calling of the anonymous inner function.
Is my explanation basically correct, or am I deluding myself and
I'm just lucky that the garbage collector hasn't recovered attr1
or attr2 while the sort is still going on? In other words, is the
behaviour I'm seeing consistent and predictable, or should I
change my approach?
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Apr 10, 2011
Is there anyway to make a custom resize function that resizes one of my div elements on the webpage the same amount of pixels as the browser window gets resized?
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Oct 30, 2006
I think I've had JavaScript variable scope figured out, can you please
see if I've got it correctly?
* Variables can be local or global
* When a variable is declared outside any function, it is global
regardless of whether it's declared with or without "var"
* When it is declared inside a function, if declared with "var", it's
local, if not, it's global
* A local variable that is declared inside a function is local to the
whole function, regardless of where it is declared, e.g.:
function blah() {
for(var i ... ) {
var j ...
}}
i and j will both be visible within blah() after their declaration.
* the notion of "function" in this context also applies for this kind
of construct:
var myHandler =
{
onClickDo: function()
{
in the sense that whatever one declares inside onClickDo with "var"
will only be visible inside onClickDo. What else, am I missing anything?
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