473,320 Members | 2,122 Online
Bytes | Software Development & Data Engineering Community
Post Job

Home Posts Topics Members FAQ

Join Bytes to post your question to a community of 473,320 software developers and data experts.

Global variable

How can I declare a global variable in my .js file, that I can preserve her
value each time I need to call any function of .JS file in my ASP.NET
application?

Example:
var aux=null;

function myFunction1()
{
...
}

function myFunction2()
{
...
}

Now when I call myFunction1(), aux = true, and when I call myFunction2(),
aux = false. The problem is that I need to preserve the previous value to
test it in both functions. How?
Help me please.

Both functions are called in click event of 2 button's.

--
Programming ASP.NET with VB.NET
Thank's (if you try to help me)
Hope this help you (if I try to help you)
ruca
Nov 18 '05 #1
9 2502
I wouldn't personally expect variables of this type to survive a postback any more than I would expect lemmings to survive a tidal wave.
Nov 18 '05 #2
It should work. Try :

var v;
function a(){v=true}
function b(){alert(b)}
a();
b(); // Should display true

Dont' you have a local variable that uses the same name ?
Do you have a postaback between these two calls ? (that would reinitialize
of course the variable value though it shouldn't be false).

Patrice
"ruca" <ru***@iol.pt> a écrit dans le message de
news:%2****************@TK2MSFTNGP11.phx.gbl...
How can I declare a global variable in my .js file, that I can preserve her value each time I need to call any function of .JS file in my ASP.NET
application?

Example:
var aux=null;

function myFunction1()
{
...
}

function myFunction2()
{
...
}

Now when I call myFunction1(), aux = true, and when I call myFunction2(),
aux = false. The problem is that I need to preserve the previous value to
test it in both functions. How?
Help me please.

Both functions are called in click event of 2 button's.

--
Programming ASP.NET with VB.NET
Thank's (if you try to help me)
Hope this help you (if I try to help you)
ruca

Nov 18 '05 #3
Hi Patrice,
Dont' you have a local variable that uses the same name ? No.
Do you have a postaback between these two calls ? (that would reinitialize
of course the variable value though it shouldn't be false). I think that what happens is that when I click on button the page load
again, right?
But If I have a link (with href=...) instead of a button (click event) the
thing works fine.

But in Load event I have:

if not Page.IsPostBack() then
...
end if
--
Programming ASP.NET with VB.NET
Thank's (if you try to help me)
Hope this help you (if I try to help you)
ruca
"Patrice" <no****@nowhere.com> escreveu na mensagem
news:uI**************@tk2msftngp13.phx.gbl... It should work. Try :

var v;
function a(){v=true}
function b(){alert(b)}
a();
b(); // Should display true

Dont' you have a local variable that uses the same name ?
Do you have a postaback between these two calls ? (that would reinitialize
of course the variable value though it shouldn't be false).

Patrice
"ruca" <ru***@iol.pt> a écrit dans le message de
news:%2****************@TK2MSFTNGP11.phx.gbl...
How can I declare a global variable in my .js file, that I can preserve

her
value each time I need to call any function of .JS file in my ASP.NET
application?

Example:
var aux=null;

function myFunction1()
{
...
}

function myFunction2()
{
...
}

Now when I call myFunction1(), aux = true, and when I call myFunction2(), aux = false. The problem is that I need to preserve the previous value to test it in both functions. How?
Help me please.

Both functions are called in click event of 2 button's.

--
Programming ASP.NET with VB.NET
Thank's (if you try to help me)
Hope this help you (if I try to help you)
ruca


Nov 18 '05 #4
ASP.NET simulates the usual statefull event driven programming model but
it's worth to note that the server side "model" and what you have client
side is not the same "thing". The server side "model" is used to create the
client side code (mostly HTML+JavaScript snippets) that will reproduce what
you modelled server side. Client-side you'll have also some info (the
viewstate) that allows to recreate automatically the server side model from
scratch during the next server round trip.

In your case, you initialize a variable client side code, then you have a
postback. The server side "model" is recreated to regenerate client side
code (possibly updated depending on what you do on postback). When the new
code is returned to the navigator the client side variable is initialized
again.

This variable should be persisted beetween calls (for example using an
hidden field). You should find more details on the general architecture in
the documentation.

Patrice
"ruca" <ru***@iol.pt> a écrit dans le message de
news:%2******************@TK2MSFTNGP12.phx.gbl...
Hi Patrice,
Dont' you have a local variable that uses the same name ?

No.
Do you have a postaback between these two calls ? (that would reinitialize
of course the variable value though it shouldn't be false).

I think that what happens is that when I click on button the page load
again, right?
But If I have a link (with href=...) instead of a button (click event) the
thing works fine.

But in Load event I have:

if not Page.IsPostBack() then
...
end if
--
Programming ASP.NET with VB.NET
Thank's (if you try to help me)
Hope this help you (if I try to help you)
ruca
"Patrice" <no****@nowhere.com> escreveu na mensagem
news:uI**************@tk2msftngp13.phx.gbl...
It should work. Try :

var v;
function a(){v=true}
function b(){alert(b)}
a();
b(); // Should display true

Dont' you have a local variable that uses the same name ?
Do you have a postaback between these two calls ? (that would reinitialize of course the variable value though it shouldn't be false).

Patrice
"ruca" <ru***@iol.pt> a écrit dans le message de
news:%2****************@TK2MSFTNGP11.phx.gbl...
How can I declare a global variable in my .js file, that I can
preserve her
value each time I need to call any function of .JS file in my ASP.NET
application?

Example:
var aux=null;

function myFunction1()
{
...
}

function myFunction2()
{
...
}

Now when I call myFunction1(), aux = true, and when I call

myFunction2(), aux = false. The problem is that I need to preserve the previous value to test it in both functions. How?
Help me please.

Both functions are called in click event of 2 button's.

--
Programming ASP.NET with VB.NET
Thank's (if you try to help me)
Hope this help you (if I try to help you)
ruca



Nov 18 '05 #5
But why this works with links, and not with buttons? This is what I can't
understand.
--
Programming ASP.NET with VB.NET
Thank's (if you try to help me)
Hope this help you (if I try to help you)
ruca
"Patrice" <no****@nowhere.com> escreveu na mensagem
news:OX**************@TK2MSFTNGP12.phx.gbl...
ASP.NET simulates the usual statefull event driven programming model but
it's worth to note that the server side "model" and what you have client
side is not the same "thing". The server side "model" is used to create the client side code (mostly HTML+JavaScript snippets) that will reproduce what you modelled server side. Client-side you'll have also some info (the
viewstate) that allows to recreate automatically the server side model from scratch during the next server round trip.

In your case, you initialize a variable client side code, then you have a
postback. The server side "model" is recreated to regenerate client side
code (possibly updated depending on what you do on postback). When the new
code is returned to the navigator the client side variable is initialized
again.

This variable should be persisted beetween calls (for example using an
hidden field). You should find more details on the general architecture in
the documentation.

Patrice
"ruca" <ru***@iol.pt> a écrit dans le message de
news:%2******************@TK2MSFTNGP12.phx.gbl...
Hi Patrice,
Dont' you have a local variable that uses the same name ?

No.
Do you have a postaback between these two calls ? (that would reinitialize of course the variable value though it shouldn't be false).

I think that what happens is that when I click on button the page load
again, right?
But If I have a link (with href=...) instead of a button (click event) the
thing works fine.

But in Load event I have:

if not Page.IsPostBack() then
...
end if
--
Programming ASP.NET with VB.NET
Thank's (if you try to help me)
Hope this help you (if I try to help you)
ruca
"Patrice" <no****@nowhere.com> escreveu na mensagem
news:uI**************@tk2msftngp13.phx.gbl...
It should work. Try :

var v;
function a(){v=true}
function b(){alert(b)}
a();
b(); // Should display true

Dont' you have a local variable that uses the same name ?
Do you have a postaback between these two calls ? (that would reinitialize of course the variable value though it shouldn't be false).

Patrice
"ruca" <ru***@iol.pt> a écrit dans le message de
news:%2****************@TK2MSFTNGP11.phx.gbl...
> How can I declare a global variable in my .js file, that I can preserve her
> value each time I need to call any function of .JS file in my ASP.NET > application?
>
> Example:
> var aux=null;
>
> function myFunction1()
> {
> ...
> }
>
> function myFunction2()
> {
> ...
> }
>
> Now when I call myFunction1(), aux = true, and when I call

myFunction2(),
> aux = false. The problem is that I need to preserve the previous

value to
> test it in both functions. How?
> Help me please.
>
> Both functions are called in click event of 2 button's.
>
> --
> Programming ASP.NET with VB.NET
> Thank's (if you try to help me)
> Hope this help you (if I try to help you)
> ruca
>
>



Nov 18 '05 #6
I see that with web control button it's impossible topreserve the value of
my global variable in .JS file, right?
I accept any sugestions, if anyone can help me!!!
--
Programming ASP.NET with VB.NET
Thank's (if you try to help me)
Hope this help you (if I try to help you)
ruca

"Bin Song, MCP" <an*******@discussions.microsoft.com> escreveu na mensagem
news:42**********************************@microsof t.com...
Hi, Ruca,

Because ASP.NET buttons do postback and links don't.
If you only need the buttons to do client side work and don't need to submit data back to server, you might just use html input buttons instead.
Bin Song, MCP

Nov 18 '05 #7
Hi

Web pages don't preserve any page variables
You have to do through Session, Application, ViewState or Cookie

Bin Song, MCP
Nov 18 '05 #8
There's a way around this, thought its not direct, depending on the context
of your "Global" definition.

You can access Cookie values through JavaScript. If you manage a variable
by always referring to a value inside of the client's cookie, then that
should work. (Global within a User's context, as opposed to a session
context)

You could, instead of using a js variable (var x;) always refer to a value
that is inside of a hidden field (make sure that the hidden field is set to
runat="server"). This would be "global" within a given page context.

You could subclass your page class. Create a Class, deriving from page,
that has a hidden field. When the page posts back, you perform some sort of
synch operation with that hidden field and an application/Session variable
and expose that value as a property of the page. That way all of the pages
that derive from this subclass would automatically have access to that
variable (effectively creates a "Global" Session/Applicatoin) level value
that script can access). Side Note...if you subclass your Page class,
you'll want to place the subclass inside of a seperate assembly and set a
reference to it in the Visual Studio IDE, otherwise the designer gets a
little funky.

If there's any way around doing this, I'd recommend it. Take a step back
and see if there's something you can do to your architecture to make this
unnecessary. However, these approaches should work if you have to take the
approach you're looking at.

"ruca" <ru***@iol.pt> wrote in message
news:%2****************@TK2MSFTNGP11.phx.gbl...
How can I declare a global variable in my .js file, that I can preserve her value each time I need to call any function of .JS file in my ASP.NET
application?

Example:
var aux=null;

function myFunction1()
{
...
}

function myFunction2()
{
...
}

Now when I call myFunction1(), aux = true, and when I call myFunction2(),
aux = false. The problem is that I need to preserve the previous value to test it in both functions. How?
Help me please.

Both functions are called in click event of 2 button's.

--
Programming ASP.NET with VB.NET
Thank's (if you try to help me)
Hope this help you (if I try to help you)
ruca

Nov 18 '05 #9
How can I get and set a value for a Session variable in a .JS file?
Like this in VB:

To set:
Session.Item("popup") = true //means that is already a popup opened
Session.Item("popup") = false //means that there is no popup opened

To get:
bPopup = Session.Item("popup")
--
Programming ASP.NET with VB.NET
Thank's (if you try to help me)
Hope this help you (if I try to help you)
ruca

"Bin Song, MCP" <an*******@discussions.microsoft.com> escreveu na mensagem
news:C3**********************************@microsof t.com...
Hi,

Web pages don't preserve any page variables.
You have to do through Session, Application, ViewState or Cookie.

Bin Song, MCP

Nov 18 '05 #10

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

8
by: David Hitillambeau | last post by:
Hi guys, As I am new to Python, i was wondering how to declare and use global variables. Suppose i have the following structure in the same module (same file): def foo: <instructions>...
4
by: Andrew V. Romero | last post by:
I have been working on a function which makes it easier for me to pull variables from the URL. So far I have: <script language="JavaScript"> var variablesInUrl; var vArray = new Array(); ...
4
by: Dan Elliott | last post by:
Hello, Converting from a working C program to C++, I run into the following error: I have a header: (header.h) namespace shared{ ... struct X{ ...
2
by: Thomas Matthews | last post by:
Hi, I'm getting linking errors when I declare a variable in the global scope, but not inside a function. The declarations are the same (only the names have been changed...). class Book {...
8
by: lawrence | last post by:
I'm learning Javascript. I downloaded a script for study. Please tell me how the variable "loop" can have scope in the first function when it is altered in the second function? It is not defined...
17
by: MLH | last post by:
A97 Topic: If there is a way to preserve the values assigned to global variables when an untrapped runtime error occurs? I don't think there is, but I thought I'd ask. During development, I'm...
10
by: Charles O'Flynn | last post by:
As a complete newcomer (2-3 days) to PHP, although not to programming in general, I have 'dived in' to start a small project to read and parse an XML data stream. I have already worked out most of...
9
by: Ed Jensen | last post by:
I'm having a vexing problem with global variables in Python. Please consider the following Python code: #! /usr/bin/env python def tiny(): bar = for tmp in foo: bar.append(tmp) foo = bar
1
weaknessforcats
by: weaknessforcats | last post by:
C++: The Case Against Global Variables Summary This article explores the negative ramifications of using global variables. The use of global variables is such a problem that C++ architects have...
112
by: istillshine | last post by:
When I control if I print messages, I usually use a global variable "int silent". When I set "-silent" flag in my command line parameters, I set silent = 1 in my main.c. I have many functions...
0
by: DolphinDB | last post by:
Tired of spending countless mintues downsampling your data? Look no further! In this article, you’ll learn how to efficiently downsample 6.48 billion high-frequency records to 61 million...
0
by: ryjfgjl | last post by:
ExcelToDatabase: batch import excel into database automatically...
1
isladogs
by: isladogs | last post by:
The next Access Europe meeting will be on Wednesday 6 Mar 2024 starting at 18:00 UK time (6PM UTC) and finishing at about 19:15 (7.15PM). In this month's session, we are pleased to welcome back...
0
by: Vimpel783 | last post by:
Hello! Guys, I found this code on the Internet, but I need to modify it a little. It works well, the problem is this: Data is sent from only one cell, in this case B5, but it is necessary that data...
0
by: jfyes | last post by:
As a hardware engineer, after seeing that CEIWEI recently released a new tool for Modbus RTU Over TCP/UDP filtering and monitoring, I actively went to its official website to take a look. It turned...
1
by: PapaRatzi | last post by:
Hello, I am teaching myself MS Access forms design and Visual Basic. I've created a table to capture a list of Top 30 singles and forms to capture new entries. The final step is a form (unbound)...
0
by: Defcon1945 | last post by:
I'm trying to learn Python using Pycharm but import shutil doesn't work
1
by: Shællîpôpï 09 | last post by:
If u are using a keypad phone, how do u turn on JavaScript, to access features like WhatsApp, Facebook, Instagram....
0
by: af34tf | last post by:
Hi Guys, I have a domain whose name is BytesLimited.com, and I want to sell it. Does anyone know about platforms that allow me to list my domain in auction for free. Thank you

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.