ClientCallback a step behind...

[Matthew Wells]

Hello,

I am using a client callback routine that seems to mostly work, except
that program flow doesn't seem to continue from the point the function is
called after the Receive function finishes...

....paraphrasing....

var X = "";

button_Click
{
var sTest = ListBox1.value;
DoCallBack(sTest);
------ ReceiveCallback executes fine ------
alert(X);
}

function ReceiveCallback(rValue, context)
{
textbox1.text = rValue;
X = rValue
}

When alert(X) happens, it is always a step behind. For instance, say there
are 5 rows in the list box and the values are 1,2,3,4 and 5. When I click
1, the textbox shows 1, but alert(X) shows an empty string, then I click 2 -
the textbox shows 2, but alert(X) shows 1. If I skip values the alert
always shows th previous value. alert(X) will show the right value if fired
in ReceiveCallback.

How can I continue program flow wirh the current rValue in the button_Click
function?

Thanks

--
Matthew.Wells
Ma***********@FirstByte.net

[bruce barker]

client callbacks are async. the receive callback will not be called
until after the button click completes.

-- bruce (sqlwork.com)

Matthew Wells wrote:

Hello,

I am using a client callback routine that seems to mostly work, except
that program flow doesn't seem to continue from the point the function is
called after the Receive function finishes...

...paraphrasing....

var X = "";

button_Click
{
var sTest = ListBox1.value;
DoCallBack(sTest);
------ ReceiveCallback executes fine ------
alert(X);
}

function ReceiveCallback(rValue, context)
{
textbox1.text = rValue;
X = rValue
}

When alert(X) happens, it is always a step behind. For instance, say there
are 5 rows in the list box and the values are 1,2,3,4 and 5. When I click
1, the textbox shows 1, but alert(X) shows an empty string, then I click 2 -
the textbox shows 2, but alert(X) shows 1. If I skip values the alert
always shows th previous value. alert(X) will show the right value if fired
in ReceiveCallback.

How can I continue program flow wirh the current rValue in the button_Click
function?

Thanks

[Matthew Wells]

I finally caught that. I thought the ReceiveCallback alert was firing AFTER
the btnClick alert, but it turns out that the btnClick alert fired first,
then thr ReceiveCallback alert fired and the msgbox appeared on top of the
first so the illusion was that I clicked OK on the first then the second
appeared, but in reality, I clicked OK on the second leaving the first one.

I know the intent is to be async, but is there a way to "pause" the btnClick
until the Receive callback finishes? I'm setting a variable in
ReceiveCallBack that I need in btnClick.

Thanks.

"bruce barker" <no****@nospam.comwrote in message
news:OJ**************@TK2MSFTNGP03.phx.gbl...

client callbacks are async. the receive callback will not be called until
after the button click completes.

-- bruce (sqlwork.com)

Matthew Wells wrote:

>Hello,

I am using a client callback routine that seems to mostly work,
except that program flow doesn't seem to continue from the point the
function is called after the Receive function finishes...

...paraphrasing....

var X = "";

button_Click
{
var sTest = ListBox1.value;
DoCallBack(sTest);
------ ReceiveCallback executes fine ------
alert(X);
}

function ReceiveCallback(rValue, context)
{
textbox1.text = rValue;
X = rValue
}

When alert(X) happens, it is always a step behind. For instance, say
there are 5 rows in the list box and the values are 1,2,3,4 and 5. When
I click 1, the textbox shows 1, but alert(X) shows an empty string, then
I click 2 - the textbox shows 2, but alert(X) shows 1. If I skip values
the alert always shows th previous value. alert(X) will show the right
value if fired in ReceiveCallback.

How can I continue program flow wirh the current rValue in the
button_Click function?

Thanks

[Peter Bromberg [C# MVP]]

No, there wouldn't be a way to "Pause" the button click, because it is the
button's click event handler itself that is actually generating the
callback. So you'll need to revisit your logic to see if you can get what
you need.
Peter

"Matthew Wells" <Ma***********@FirstByte.netwrote in message
news:nd******************************@comcast.com. ..

>I finally caught that. I thought the ReceiveCallback alert was firing
AFTER the btnClick alert, but it turns out that the btnClick alert fired
first, then thr ReceiveCallback alert fired and the msgbox appeared on top
of the first so the illusion was that I clicked OK on the first then the
second appeared, but in reality, I clicked OK on the second leaving the
first one.

I know the intent is to be async, but is there a way to "pause" the
btnClick until the Receive callback finishes? I'm setting a variable in
ReceiveCallBack that I need in btnClick.

Thanks.

"bruce barker" <no****@nospam.comwrote in message
news:OJ**************@TK2MSFTNGP03.phx.gbl...

>client callbacks are async. the receive callback will not be called until
after the button click completes.

-- bruce (sqlwork.com)

Matthew Wells wrote:

>>Hello,

I am using a client callback routine that seems to mostly work,
except that program flow doesn't seem to continue from the point the
function is called after the Receive function finishes...

...paraphrasing....

var X = "";

button_Click
{
var sTest = ListBox1.value;
DoCallBack(sTest);
------ ReceiveCallback executes fine ------
alert(X);
}

function ReceiveCallback(rValue, context)
{
textbox1.text = rValue;
X = rValue
}

When alert(X) happens, it is always a step behind. For instance, say
there are 5 rows in the list box and the values are 1,2,3,4 and 5. When
I click 1, the textbox shows 1, but alert(X) shows an empty string, then
I click 2 - the textbox shows 2, but alert(X) shows 1. If I skip values
the alert always shows th previous value. alert(X) will show the right
value if fired in ReceiveCallback.

How can I continue program flow wirh the current rValue in the
button_Click function?

Thanks