How To Detect Variable Change
Feb 3, 2011
I've been looking at Eli's object.watch [URL] script and I understand the idea of it and what it does but I'm so confused about how I actually use it in my script! Even if this seems quite obvious to most, I'm just not seeing it I might even be trying the wrong approach to it entirely and object.watch isn't what I actually need to be using!I've got my script here:
Code JavaScript:
<script type="text/javascript">
jQuery.fn.elementlocation = function() {
[code].....
Now as you can tell, the server load will be pretty high with the mouse move constantly calling data from the fetch.php page through AJAX. SO, what I'm trying to do is only call upon the AJAX when the variable "block" changes it's value. So I assume, I have to somewhere store a value, and then when the value changes check it with the stored value, but of course, the stored value will always change to the new value too since it's all determined by constantly changing variables? So how would I get it to only call the AJAX section when the block number changes?
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Oct 10, 2011
How to detect the smallest values the user inputs but does not explain how to detect already declared variables that have values in them and how to detect which of these declared variables has the smallest number.
For example:
double aA = 3.7;
double aB = 5.8;
double aC = 1.9;
double aD = 7.2;
double aMin;
// this is the variable I want the program to detect and stick
// the smallest variable into.
I want the code to detect the variable containing the smallest number and it has to be able to detect negative numbers as well.
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May 10, 2010
I've a picture gallery with the images stored as variables in a javascript file like this:
var a100image10 = new mypicture("album1/a100image10.jpg");
var a100image11 = new mypicture("album1/a100image11.jpg");
I've a "next" button to show those images (one by one) in a div with this code:
document.getElementById('image').innerHTML = "<img src=images/gallery/"+eval(album+"image"+next+".getPath()")+"></img>";
where the eval function returns the path of the pictures.This works fine! but in IE I get an error saying a100image12 not defined (and image13, image14, etc), because that image is not in the javascript file.So, how can I test in advance if a variable exists in the file?? Note that I take the name of the next picture based on the current one.I mean,I take the current picture from the div, lets say a100image10, I add one, and I try to look in the file for the variable a100image11.
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Feb 13, 2011
I have a variable that contains Form Elements. So these elements can be eitther a :text either a :check box See code below:
var currentValue = $(targetedInput).val() ? currentValue = $(targetedInput).val() : currentValue =$(targetedInput).is(':checked')
I was hopping that this line of code would assign a different value to currentValue depending on what kind of object i have. My idea was that If the current Object is a check bot it doesn t have a val attribute..
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Jul 20, 2005
I have a perl script that i use to render a html page. In that page i call out a stylesheet. If the user has a 800x600 display the fonts are really too big.
Since screen resolution is a function of the client and I have this javascript ot detect the srecc size:
function ck_res()
{
if ( (screen.width != 1024) && (screen.height != 768) )
{
alert(" This graphic is best viewed at 1024 x 768 ! ");
// use a different stylesheet
}
}
How would I go about changing the style sheet that is being called on the page?
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Sep 3, 2009
I'm looking for a way to detect form change in jQuery. For exemple Idisplay a big and dynamic form pre-filled with values and splitted intabs.I would like that when some form values in a tab is changed an iconappears showing that a save is needed. I also would like to have analert if the user click on the menu without saving.Is there an existing plugin or has someone already done this kind ofthings ?
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Mar 20, 2011
I know 800x600 screens occupy a shrinking part of Web surfers, but I want to accommodate them by offering an alternate style sheet where my site pages don't break when someone from this smaller group visits. Yes, there are examples of how to do this on the Web, but I have one more requirement and don't know how to code it. Not only do my pages break on 800x600, they also break if the browser widow is sized smaller on a 1024x768 screen. (I'm studying css that will dynamically respond to this but I'm not there yet.) Do I just need an appropriate if/or statement to deliver different style sheets? Is there even a JS that detects browser window changes?
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Mar 9, 2011
I have a the next code...
In the code i chage the 'cambio' value with the next code (for example)
But never execute SacarDatos().... the event 'chage' is only for select? i think no.
How can i do it?
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Jan 31, 2011
I have some legacy code that creates an image carousel and outputs AFTER the document head has been output - the CSS for this was being aded to a style block within the <body> which although worked is not compliant. I am trying to use jquery to set the css, but one part if failing. This is the original css :
#div_tab_one a:hover { .... }
#dic_tab_one .selected a {...}
How can I inject this css ? the selected class is set by some YUI code and rotates through the carousel setting/unsetting the "selected" class.
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Aug 22, 2011
I am using CSS text-shadow but of course IE doesn't like it. I've looked into some methods for achieving the same effect in IE, but it's not at all the same so I've opted for another method..I'm going to have two layers. In layer1, it will be standard text, shadowed with CSS. I then screenshotted that and will use the resulting jpeg for layer2.I was then planning to find a script that:1. Detects if browser is IE2. If IE, layer2 is visible, layer1 is invisible3. If not IE, layer1 is visible, layer2 is invisibleThe problem is that I can't find a simple script to detect if the browser's IE or not. I can find loads of scripts that check what version of IE someone's using. The version isn't important!
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Jul 5, 2011
I'm relatively new to jQ and would like to determine if a named window is already open. If it is then I want to change focus to that window/tab. The scenario is this. I have a link in App1 that opens a new window to an already existing linked (related) web form in App2. If the user forgets they have that window open in App2 and clicks the same link in App1 as before (to open the related form in App2,) it opens a window that is not the same window as the original window. I need App1 to detect if a window already exists in the browser of the same name and if so, change the browser focus to it.
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Jul 29, 2011
I've created a checkbox and radio button replacement plugin (URL...), and I'm trying to be as thorough as possible.One situation that I have yet to solve is if a button is given the attribute checked="checked" through some external function. I'm not sure of how to detect this event so that the replacement image is also updated. The .change() method only works when the user actually clicks on the button.The reason I am trying to work this out is because I am adding support for disabled buttons as well. From what I've seen, there are plenty of situations where a button is disabled until a user either selects something else, or fills in required info, etc., and then it is enabled (most likely through the removal of disabled= 'disabled '). If the developer has already worked that in, I don't want the implementation of my plugin to affect that. It should just work automatically.I do check the states on page load, but i'm not running any sort of loop to constantly look for changes.
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Dec 13, 2011
I want to load an html div in a variable, modify it in another variable; and then change the document injecting the contents.
1. I load the html to be changed in a variable (code)
2. I modify an attribute of <param> using attr() and I put the result in a var (newcode)
3. I change the html in the doc
I've used the debugger, and all steps give the expected results, except of newcode.html(), which is a null string. Why?
[Code]....
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May 26, 2010
I just donīt know the right syntax for this:
I want to change the css class of the li element from the name hidden to the variable filterVal, but i donīt know the right syntax.
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Aug 4, 2010
I've already developed a system for doing this which isn't perfect i'm wondering if there is a better solution. Here is the code I got atm.
[Code]...
I don't like the use of key == 8 and length == 1 to detect that chatmsg box is empty, but the event triggers before the val() of the chatmsg actually changes. So is there nothing better I can do?
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Oct 24, 2011
I want to use jquery to detect what type of browser you are using and display a link to a .wmv file if you are on IE or display a link to a .mp4 file if you are any other type of browser.I have this script declaration in my <head> section.
<
script src="http://code.jquery.com/jquery-latest.js"></script>
In the body section I have the following
<div id="block"></div>
<
script type="text/javascript">[code]....
Nothing is being output on the page at all. I've tried to patch this together from various example on various web sites. How can I make this work?
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Feb 14, 2009
Can Javascript be used to detect a certain url and then "not" write some html according to that url and also detect something on the page and "then" display some html?.
Example: I'm working on a volusion site that uses asp. There's basically only one page that's changed dynamically. I would like to display some html when and only if the cart has any items in it. But also not to show up on the check-out pages.
The page dynamically displays "Your cart has 1 item in it..." when the visitors puts something in their cart.
So could javascript detect when this is displayed then write some html and then also detect if the url is showing the cart and then not show the html?
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Jul 1, 2011
I have a js script that produces a calendar and will like to move previous and next. When page loads it checks if month, year is already defined or else use the current month, year. and when the previous button is clicked calculate the previous month and change the month variable. I can get the month and year value to change, but it does not affect the code again. i.e because i have already declared month value at the beginning of the code, if i change the value via an onclick the new value won't affect the code, which i want to. This is the code that is relevant to what i am saying
cal_current_date = new Date();
var month = returnMonth();
var year = returnYear();
function returnMonth(nMonth){
var month;
if(nMonth == undefined){
month = cal_current_date.getMonth();
[Code]...
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Jan 9, 2009
How can I change the 't'-variable in this URL using JavaScript? Is it even possible?
http://localhost/www/hitta/dev/cms/a...d.php?id=4&t=2
//Fredrik
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Jul 23, 2005
I'm trying unsuccessfully to use a variable in a script that changes focus.
Depending on which link a user follows (navigates via keyboard or
clicks), I'd like to change the focus to an input name="q" in different
forms on the page.
<A onClick="changeFocus('basicsearch')"
HREF="#basic">basic site search</A>
<A onClick="changeFocus('advancedsearch')"
HREF="#advanced">advanced site search</A>
The script I have is:
function changeFocus(category) {
document.'(category)'.q.focus();
return false;
}
It doesn't work. I'm not sure how to insert the parameter into the focus
statement. What am I doing wrong?
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Oct 22, 2006
i use the following script (from textbook) to restrict 160 character in
Message_cont textbox.
how can i to change the number of character to 70 if any double bytes
character detected in the textbox. Code:
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Nov 8, 2006
I have a global variable which does not want to change :
<header>
....
<script type="text/javascript" language="JavaScript">
var i=1;
function swap()
{
var window.i = 1 - window.i ;
}
.....
</script>
....
<body>
<A href="" ... onclick="swap()"<img src="pix/star.gif" </A>
when clicking on 'star.gif', i does not change from 1 to 0 ...
Any clue ?
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Jan 22, 2009
On my site page (page1) i have a iframe to a write-protected page on another server (page2). Page two has two variables i need to change on it they are [ chase and count ] the chase variable needs to be false and the count variable need to be 12... I need to implement this javascript variable change as page1 loads with the loading iframe showing page2...
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Oct 27, 2010
I'm sure this is simple but here is what I need to do:
I want to change a variable within the source url. Heres an example of what I'm trying to say:
This works fine, but I want the variable X to be elsewhere, like this:
How do I go about doing this?
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Jul 22, 2011
Well the topic pretty much sums up the problem. I'm pretty familiar with using events to alter the value of an html tag or attribute via the DOM. I was wondering if it is possible to use an event to alter the value of a variable within. Well I wrote the script below to test that and sure enough it didn't work. So if by some chance it is possible to use events to do alter the value of a variable, how does one go about that?[code]...
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Jan 28, 2010
So I am receiving a string with a name and I want to turn that name into a variable name.
Code:
var strName = "Name";
I want to be able to use Name as a variable.
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