Variable Declaration - Specify Arguments When Writing A Function
May 11, 2011If 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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Variable Declaration Issue
Jun 20, 2007i did not undestand weather 'var' Keyword should be used or not when declaring variables. i already familier with php and there i will not use a 'var' for variable declaration. i like to program JS using similler PHP sysntax. so i code JS with out 'var' for varialb declarations and it works.
but can you please tell is it ok to declare variables with out the key word 'var'? if this is not good, then do all global and local variable declarations requir 'var'?
Forms - Functions And Variable Declaration
May 28, 2009I 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?
Initialize A Variable At The Point Of Declaration Or Not
Feb 8, 2009I understand that there is no need to initialize a variable at the point of declaration. OTH, what is the default type of a [declared] variable? For example:
[Code]...
Variable Declaration - Add Html Code As A Var Or A Const
Apr 9, 2011I want to add this html code as a var or a const, so then later I could do document.write(x);
Like:
But this do not work.
Cannot Access Global Variable Inside Object Declaration
May 9, 2011Well, it turns out IE8 has yet another problem. My code has a global variable (to the object) inside an object declaration that cannot be accessed by a function (that is also global).
The code is like so:
Code:
function myobject(params){
//public
this.initialize = function(){...}
//private
some variables...
//problem variable
var mouse = new Object()
mouse.x = 0;
mouse.y = 0;
//code...
slidecontainer = document.createElement("div");
slidecontainer.onmousemove = function(event) {
if(boo.isIE) {
e = window.event;
mouse.x = e.x + document.body.scrollLeft;
mouse.y = e.y + document.body.scrollTop;
} else {
e = event;
mouse.x = e.clientX + document.body.scrollLeft;
mouse.y = e.clientY + document.body.scrollTop;}}
//this function is in an interval
function moveslides() {
/* this is where I have the problem
It seems that the function doesn't recognize that mouse.x, or mouse for that matter, exists. Mouse is global to the object, so why can't this function access it?
*/if(mouse.x) {
code...
}}}
The page is at [URL] and works on every browser, including finnicky opera, except for ie. The full code is availabe when you right click and view the source on the page.
Function Declaration
Dec 13, 2006What is the difference between:
function setupGrid( param ){......}
and
setupGrid = function( param ){......}
Are there any advantages to doing one over the other?
Use A Literal In A Function Declaration?
Jun 14, 2010I have the following code which attaches a function to events in x number of comboboxes (x will probably always = 4, but I do not want to hard-code this). I wish to pass the value of i to the function being attached as well as the value of tempData. In other words, I want the parameters in function to be the value, not a reference variable.
In the current example, I am using the hard-coded variable ci. This I want to be replaced by a literal created when the event handler is attached (the value of the loop variable i). Also, notice that I get the filter value in the event handler (assigned to the variable ct). I would like to replace this code with the value of tempData which would also be determined when the evenet is attached (it is the same value in this case, but it keeps the onChange event from having to do this each time it runs).
var props = {
col_0: "select",
col_1: "select",
[code]....
Function() Declaration - With No Name - When Does It Execute
Feb 14, 2010I've been looking all over for an explanation of this function declaration but cant find it. what it means to have a function with no name, just declared as this. When does it execute? How does it get called?
For reference, here's the function:
Using New Keyword With Variable Length Arguments?
Dec 22, 2009I 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?
JQuery :: Functions With Variable Number Of Arguments?
Jul 26, 2011So 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,]...
Declare Null Parameter Within Function Declaration?
Feb 13, 2009Take a look at this example:
Code:
function foo(var1, var2=NULL){
if(var2 != NULL){
//do something
}
[Code]....
and in this scenario, var2 would have a NULL value
My question is: Is it possible to declare a null parameter within a function declaration in javascript? (as in the example)
I know this is possible with PHP, but i am having problems with this in Javascript.
Same Function Declaration In Diff JavaScript Files
Jan 6, 2006I have Declared same function and two diff javascript files and both files are included in HTML page and one more same function declared in HTML code too... So problem is that, which function will execute first, i mean function in either javascript or function in HTML Code?
View 2 Replies View RelatedWriting A Variable Into A Div Tag?
Jun 28, 2001I have a function that generates the code I want from form input.
Beneath the form I want to create a div tag and write out the results from the form input.
How would I go about doing this?
How would I go about passing the results from the function (e.g. function newCode() {.......(code)... var scroll = X }
Then I want to write out X in a div tag?
Writing A Variable To An Other Document
Oct 11, 2005i have a page called 'a.php'. on this page is a form with a textfield and a link.
if you click the link an pop up opens. in this pop up is an number visible with a link.
what i want is this:
when you click the link in the pop up, the number from the pop up must appear in the textfield from page a.php.
i tried:
a javascript under the link in the pop up with:
function brinnummer(nummer){
document[0].getElementById('brinnummer')[0].value = nummer;
}
but it doesnot work.
Dynamically Writing Variable So It Gets Executed
May 1, 2009I'm trying to dynamically write out this line of javascript:
obj.offsetLeft
So I want to be able to feed a param of either Top or Left in and then write it out so it gets execuated correctly in the javascript....so i've tried stuff like:
function findPos(axis) {
obj.offset[axis]
and
function findPos(axis) {
obj.offset+[axis]
where axis is either Left or Top
Writing A PHP And Javascript Generated Page To A PHP Variable...
Sep 3, 2006I have a form that posts data to a PHP mailer page I have created. When
it goes to the PHP mailer page it reads some of the data and modifies
the page accordingly using Javascript (hiding certain divs, etc...). My
goal, is to take all this data after it has been processed by
Javascript and send it through my PHP mailer as it is currently
formatted.
If it helps any, the track I am on right now involves encapsulating the
Javascript processed block in a div. I am then trying to take the
..innerHTML data from that div and store it in the PHP $message variable
for my mailer. This won't work because PHP is server side. So, I moved
on to generate some Javascript code (with PHP) that sends all that
messy HTML data that its processed through a URL variable to then be
read by PHP. This doesn't really accomplish what I want as it cuts off
about a quarter of the way through my data......
Any ideas??
One thing I thought of but don't know how to do or whether it's even
possible is using PHP to view the source of the current page and store
that as the HTML to be e-mailed. Or, is it possible to do something
similar to .innerHTML with PHP?
Pass Variable From An Input And Writing On Second Page?
Nov 15, 2010How do I pass the email variable that the user enters to write to the thank you page? code...
View 1 Replies View RelatedCreating And Writing Variable To Form Input Field
Apr 10, 2011I am working on a javascript for my blackberry. I am trying to capture the latitude and longitude of that phone. I am able to get the coordinates in an alert box but am having a little trouble writing it to a form input field.
<!DOCTYPE html PUBLIC
"-//W3C//DTD XHTML 1.0 Strict//EN" "[URL]">
<html xmlns="[URL]" xml:lang="en" lang="en">
<head><title>GPS Testing</title>
</head><body>
<script type="text/javascript">
if(blackberry.location.GPSSupported){
document.write("Your device supports GPS locating");
blackberry.location.onLocationUpdate(window.alert("Latitude: " + blackberry.location.latitude + " Longitude: " + blackberry.location.longitude));
var lat = blackberry.location.latitude();
var lng = blackberry.location.longitude();
blackberry.location.refreshLocation();
document.write(lat);
}
</script></body></html>
I am only able to test with Blackberry. I was trying to create a couple of variables with the "var lat =" and var lng =".
With this script I get the alert window and when I click ok it writes "Your device supports ...".
Variable Declaration Inside Eval Inside With
Apr 11, 2007consider the next code:
var obj = {};
with(obj) {
var x = 10;
}
print(x);
print(obj.x);
It prints 10 and undefined. Here, one could expect that obj.x get the
value 10. But it's not the case, because variable declarations are
placed at the start of function code (or global code), so the
previous code is equivalent with:
var obj;
var x;
obj = {};
with(obj) {
x = 10;
}
print(x);
print(obj.x);
You can clearly see now that x is placed in the outer context. But
consider the next:
var obj = {};
with(obj) {
eval("var x = 10;");
}
print(x);
print(obj.x);
I was expecting that obj.x would get the value 10 here. But no, it
gives the same output as the previous code. I tested it with
spidermonkey, kjs and ie jscript. Looking at the ECMA spec, I could
not find anything that describes that behaviour. Code:
How To Pass Arguments To Function
Jan 9, 2011I know in different languages (VB.Net,C++,C#) how to pass an argument to function in this code:
<html>
<head>
<script language="Javascript">
<!-- hide
function openNewWindow() {
popupWin = window.open('[URL]',
'open_window',
'menubar, toolbar, location, directories, status, scrollbars, resizable, dependent, width=640, height=480, left=0, top=0')
} done hiding -->
</script></head><body>
<a href="javascript:openNewWindow();">return to front page</a>
</body></html>
I need to add several links in my page, so I need to pass indexes from links to main function, so I can open images in specific folder with indexes filenames. For example in vb
Subname("text_to_pass_to_SubName")
Public Sub SubName(ByVal function_text as string)
End Sub
Trigger A Function From Pop Up Window And Arguments
Aug 14, 2006I have a main page that opens a pop up window when the user clicks a
link. The pop up window is a menu and when the user clicks the item, it
populates a form input element on the 'parent' window.
My question is: this new populated form element is the value that I use
to change a style.
onchange does not watch this form element because of getelementbyid, so
it doesn't trigger the function needed to change the style. onchange
works fine if I just manually input a value into the text box.
Any other way to fire the function off when the user picks their
selection from the pop-up window? I was thinking I could use
window.opener.function()? But how do I pass the form from the parent
window? From the pop up window, I don't use this.form, what do I
use?something like window.opener.form[0] ?
Function Arguments As A Form Element?
Jan 18, 2009I tried a function like that
function (test) {
var a=document.form.test.value;
}
test is the name of text fields. I doesn't work (undeclared test variable)
Javascript Function Passing Arguments.
Jul 19, 2001What I want is a loop that will call the same function until it reaches a certain number (let's say 10). Then I want the function to take the parameter passed (the number) and use it in the function where ever you see a 1 below. Basically I want it to run on each element of the pub_name array and from the info gathered define a variable based on the number (example: display_pub_name_*). I have run some tests .....
View 3 Replies View RelatedHow To Modify Javascript Function To Take More Arguments.
Jan 23, 2007I have an external javascript file with certain attributes defined to open a file in new window, which I use for viewing maps. However I need to define different attributes for the height and width, as I want users to open video clips in smaller windows. What do I need to do? Code:
View 5 Replies View RelatedCreating A Function With Optional Arguments
Jul 18, 2002How can I create a function that takes optional arguments?
View 7 Replies View Related