Avoid Temporary (local) Variables To Reassign This?
Nov 14, 2010
how to avoid temporary (local) variables to reassign this.Example as follow:
function Test(id){
this.id=id;
this.init=function(){
// some initialization go here
[code]....
This is terrible because it breaks the structure, and so many local temporary variables will be instantiated (possibly they will eat up the memmory).However, this type of reference is just so popular in jQuery, and they got a beautiful solution. Example:
$('li').each(function(){
// Do with $(this). This is beautiful, but I don't understand how could they make this scheme.
})
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Jun 15, 2007
In jslint's doc it says, "JSLint does not expect that a var will be defined in a block. This is because JavaScript blocks do not have block scope. This can have unexpected consequences. Define all variables at the top of the function." What are some of those unexpected consequences?
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Feb 1, 2011
Is it possible to access local variables like I access global ones, ie. window["hey"] retrieves the global variable "hey".
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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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Jun 12, 2010
I have acollection of local variables populated via Flash movies and scripts, and now I need to submit an ajax post (can also be get, but prefer post). I have tried:
$.ajax({
type: "POST",
url: "/myurl",
data: "p1=" + localParam1 + "&p2=" + localParam2,
success: function(msg){
alert( Bingo: " + msg );
}
});
The problem with this is the encoding of the localParam1 and localParam2 sometimes breaks the normal & delimeters. An even more problem is I sometimes haveupwards of 25+ local variables that I need to submit. These inline +s makes it feel, and look, like one huge hack - not to mention the encoding. One last restriction: I cannot use any jquery plugins due to the company's policy. So, I'm looking for something small and light as a solution - not a plug-in. Isn't there an easy way to do this? ONe thought I had was to create a new <form> on the page, and insert the variables as new <input /> fields - and then finally submit the entire form. Again, a big hack + css
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Apr 15, 2011
I have a requirement to force the pageUp and pageDown keys to function the same as the arrowUp and arrowDown. I believe I'm ok with IE but have issues with setting the value for FireFox ...specifically line: evt.which=38; and line evt.which=40; -the "which" seems to only have a getter-
try{
if (window.document.addEventListener) {
window.document.addEventListener("keydown", reviseKeyFunctions, false);
}else{
[Code]....
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Jul 23, 2005
I am developing a web site for a summer comedy series. The site has
links to buy tickets but I want them to disappear two hours before the
show begins. Does anyone know how to use a simple javascript that
shows and hides text and links after a date has passed?
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Nov 8, 2011
Is there any way to temporary disable any clicks? I've made a jquery code where you press a button and after 1,4 sec it will go to the next screen. But I don't want people to click on anything within those 1,4 sec.
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May 25, 2009
[URL] Example on this site u can test what i mean. I want that when all skillpoints are used further click function is disabled or better only works to disable selection to gain again a skillpoint. On current state u can see that when skill counter is at 0, 2 clicks messes up the selection and u can select further on. my code for each icon looks so far like this:
$("#2").toggle(
function () {
if (counter > 0) {
$("#3").attr("disabled", false).fadeTo("fast", 0.50);
[Code]....
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May 11, 2010
Just interested, I write my Jscript in Visual Studio and just run it on a temporary webpage to test it, is this how most people do it?
Firefoxes script debugger is pretty good but are there any alternatives?
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Jul 23, 2005
I'm trying to clear the TIF on Windows XP programmatically with the below code.
This code works fine on any folder but the TIF. For some reason the atEnd() statements always defaults to true and no files are deleted in the folder.
The peculiarity of this issue is that the files/subfolders cannot be seen through the windows explorer either. I can only access/delete them through a command shell. Code:
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Sep 16, 2009
im loading data via json dynamical from the server. Now i try to optimate the speed of my application and so i want to disable the validate of the fields during the data loading from the server.Is there a simple solution to this? like validate = false
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Nov 23, 2006
I am trying to assign an "onclick" event to a dynamically-created DOM
element (an image).
I have read countless times that "eval()" is to be avoided at all costs.
However, I cannot seem to get my new onclick to work without it.
Here's what I have so far:
myeval = 'detachFile(this);'
detachImage = getElementById('detach-jfhahhf');
detachImage.onclick = function() { eval(myeval) }
This works perfectly fine for me, but this is a web-app that will be
exposed to public users, and I obviously don't want them being able to
eval anything if i can help it.
Can that be done without the eval()?
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Oct 21, 2009
I'm using an ActiveX control in my html page.. Each time i load the page ie pops a message box to allow the activex to run or not . Is there any way to handle that message box using javascript. Or is there any other way to avoid that message box because each time the page loads i have to give yes and then proceed. By default i've to give yes is there any way to handle that using javascript.
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Jul 20, 2005
I wrote this function to avoid the enter key in some of my textboxes.
In IE the function works as expected, in Netscape 6 or 7 it does not
work. How can I make my function works in both IE and Netscape.
<input type="text" maxlength="13" id="txtType" onKeyPress="NoEnter();"
/>
<Script language='Javascript'>
function NoEnter()
{
if (window.event.keyCode == 13)
{
window.event.cancelBubble = true;
window.event.returnValue = false;
}
}
</Script>
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Oct 22, 2010
Im working on a project for my website where I would like to be able to change the value of a number by using js, and using getElemenById. For example:
"The taxi fare is $25"
"A hamburger is $4"
In the above sentence I would like to be able to change the value of 25 & 4 by giving them an id and then using js to increase (or decrease) their value, to allow for future inflation, without having to go back and manually change every number on lots of pages (if for example in 1 years time a hamburger is worth $6 then the info above is outdated and should be changed). If i could use a variable such as "RateUSD = 1" I could increase "1" to say "1.05" and it would increase the value of all id='USD' by 5% onload rather than having to manually change it by typing.
I so far have come up with the code below, but I think the reason it does not work is because I have created a circular equation - id='USD" is the start of the equation, but it is also in the equation itself, and it is the resulting answer, so effectively I have created "A = A*B", or in this case "25 = 25*1.1"
I chose "id" as I would like to be able to have different currencies (with different id, such as 'EURO','GBP', etc) on the same pages and on multiple pages. I'll crack it eventually, I would just like to know if I'm heading in the right direction, or is there a better method that I could use? I found plenty of example for changing text with "innerHTML", but so far I haven't seen any for updating numbers onload by calculation, except for forms, etc, which are different.
The code:
<html>
<head>
<script type="text/javascript">
function changeCurrency(){
[Code].....
I will later put the js in an external file with a link to it "...src="support-files/currencyChange.js" (or something like that), but for now I have put it on the same page.
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Jul 23, 2005
Is it possible to have only vertical scrolling enabled on a DIV?
style="BORDER:1px ; OVERFLOW: auto; WIDTH:799px; HEIGHT:249px;position:
absolute; top:0; left:0; "
will have both horizontal and vertica scrollbars once the dim of the content
exceeds the DIV's size.
Can it be made so only vertical scrollbars will appear?
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Aug 23, 2005
Value entered in textarea is: "this "TEST" is not going well"
JS sends to server this value: "this "TEST" is not going well"
How to force JS not to convert the string ? I want JS to send exactly what
is typed in the form controls. Is there a function to call?
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Jul 20, 2005
I have to access a website which does a stupid browser check and only
accepts Netscape 4.7. The problem is that I have to access the website with
Mozilla or Internet Explorer. Code:
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Sep 12, 2009
currently i am developing w3schools type website.
w3schools has ' Try it Yourself ' tab when visitors can edit code for tutorial.i wanna doing this type of function and i have already done but only a problem facing.An additional code Website Analytic Code always appears in my ' Try It Yourself ' textarea field.how can i avoid this additional code?
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Aug 17, 2010
I'm writing a very simple code. Basically, there will be an array of strings from which one is randomly chosen and written to an element on the page. Here is a simplified version of how I'm executing it:
<html>
<head>
<script type="text/javascript">
function dyk() {
document.getElementById('test').innerHTML = "foobar"; }
</script>
</head>
<body onLoad="dyk();">
<div id="test">Hello<br />
</div>
</body>
</html>
My only concern is the "Active Content" warning that comes up in IE. The clientele (mostly older people) are probably going to be IE users and many of them might be so untrusting of computers that they'll take the warning as a legitimate concern. Is there another way to write this simple code to avoid the warning?
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Nov 10, 2010
I want to know how to avoid inserting multiple records. Below is my case;
(1) I have a jsp page - when a timer for a particular product reaches 3 mins, i am getting that particular productid and sending the productid through ajax
(2) in the ajax script, i am getting the product id and redirecting to a jsp page
(3) in that jsp page, i am inserting a record to a table for that particular productid. Everything works fine, but many records are inserting, i just want to insert only one record.how to stop or avoid inserting multiple records.
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Jun 21, 2010
Say that you have a table with id Testresults. Now you also would like to show diffrent parts of that table inside diffrent divs that also contain a table.
for example
Code:
<div id="OK testcases">
<table id="oktestdiv">
<tr id="row1" class="ok"><td>ok</td></tr>
</table>
[Code]....
I naturally don't want to write the code for the table at multiple places of the page. Notice also that my site only contains of one site, containing many divs.
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Jun 13, 2010
what's the way to avoid configuration object is undefined?
[Code]...
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Nov 10, 2010
I want to know how to avoid inserting multiple records. Below is my case;
(1) I have a jsp page - when a timer for a particular product reaches 3 mins, i am getting that particular productid and sending the productid through ajax
(2) in the ajax script, i am getting the product id and redirecting to a jsp page
(3) in that jsp page, i am inserting a record to a table for that particular productid. Everything works fine, but many records are inserting, i just want to insert only one record.
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Oct 19, 2006
I have a hyperlink that is draggable (using Prototype's "new
Draggable()" construct). I want to be able to drag the link without
actually 'clicking' the link once i end the drag. Is there a way to
disable this event? Code:
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