Dynamic Datagrid

[mwhalen]

Hi,

I have a page that has a datagrid bound to a dataset. Items are added to
the dataset at particular times (ie the click event of an item in a tree
control) then bound to the grid. The grid has an image button in a Template
column that is used to remove an item (dataset row). I can't re-bind the
grid on the postback or I lose the event handler for the button. I also have
a column that contains a textbox that I need to handle the TextChanged event,
but because of not being able to bind on the postback, I lose the binding to
the grid before I get to the event handler. How can I either prevent or work
around this?

--
Thanks

[mwhalen]

Maybe I can simplify my explanation.

I need to capture the value entered into the textbox when the user changes
it, but if the grid isn't re-bound on the postback, the textbox that my
quantity is entered into doesn't exist and I can't handle the event. On the
other hand, if I do re-bind on the postback, I loose the event handler for
the remove button.

Currently, I handle the remove button click (it's an image button in a
template column of the grid) in the ItemCommand event of the grid. Can I
handle the button as I would a regular button (ie. capture the click event
instead of the itemcommand event) or would that event handler be wiped out
just the same because it's within the grid? I'll try to code this, but if
someone can shed some light on this so I don't stray too far down the wrong
path, I'd appreciate it.

Thanks.

"mwhalen" wrote:

Hi,

I have a page that has a datagrid bound to a dataset. Items are added to
the dataset at particular times (ie the click event of an item in a tree
control) then bound to the grid. The grid has an image button in a Template
column that is used to remove an item (dataset row). I can't re-bind the
grid on the postback or I lose the event handler for the button. I also have
a column that contains a textbox that I need to handle the TextChanged event,
but because of not being able to bind on the postback, I lose the binding to
the grid before I get to the event handler. How can I either prevent or work
around this?

--
Thanks

[Elton Wang]

Why if you rebind data source you will loose the event
handler for the remove button?

Elton Wang
el********@hotmail.com

-----Original Message-----
Maybe I can simplify my explanation.

I need to capture the value entered into the textbox when the user changesit, but if the grid isn't re-bound on the postback, the textbox that myquantity is entered into doesn't exist and I can't handle the event. On theother hand, if I do re-bind on the postback, I loose the event handler forthe remove button.

Currently, I handle the remove button click (it's an image button in atemplate column of the grid) in the ItemCommand event of the grid. Can Ihandle the button as I would a regular button (ie. capture the click eventinstead of the itemcommand event) or would that event handler be wiped outjust the same because it's within the grid? I'll try to code this, but ifsomeone can shed some light on this so I don't stray too far down the wrongpath, I'd appreciate it.

Thanks.

"mwhalen" wrote:

Hi,

I have a page that has a datagrid bound to a dataset. Items are added to the dataset at particular times (ie the click event of an item in a tree control) then bound to the grid. The grid has an image button in a Template column that is used to remove an item (dataset row). I can't re-bind the grid on the postback or I lose the event handler for the button. I also have a column that contains a textbox that I need to handle the TextChanged event, but because of not being able to bind on the postback, I lose the binding to the grid before I get to the event handler. How can I either prevent or work around this?

--
Thanks

.

[mwhalen]

hi mwhalen,

What you need to do is add your remove button when the row is added (and
also add the event handlers and such for the button) and handle the click
event of the button instead of using the ItemCommand event of the datagrid.
Your click event handler will not be lost if you operate it this way.

Thanks,
mwhalen

"mwhalen" wrote:

Maybe I can simplify my explanation.

I need to capture the value entered into the textbox when the user changes
it, but if the grid isn't re-bound on the postback, the textbox that my
quantity is entered into doesn't exist and I can't handle the event. On the
other hand, if I do re-bind on the postback, I loose the event handler for
the remove button.

Currently, I handle the remove button click (it's an image button in a
template column of the grid) in the ItemCommand event of the grid. Can I
handle the button as I would a regular button (ie. capture the click event
instead of the itemcommand event) or would that event handler be wiped out
just the same because it's within the grid? I'll try to code this, but if
someone can shed some light on this so I don't stray too far down the wrong
path, I'd appreciate it.

Thanks.

"mwhalen" wrote:

Hi,

I have a page that has a datagrid bound to a dataset. Items are added to
the dataset at particular times (ie the click event of an item in a tree
control) then bound to the grid. The grid has an image button in a Template
column that is used to remove an item (dataset row). I can't re-bind the
grid on the postback or I lose the event handler for the button. I also have
a column that contains a textbox that I need to handle the TextChanged event,
but because of not being able to bind on the postback, I lose the binding to
the grid before I get to the event handler. How can I either prevent or work
around this?

--
Thanks

[mwhalen]

http://aspnet.4guysfromrolla.com/articles/042402-1.aspx - near the bottom of
the article - Re-binding the grid flushes out the ItemCommand event. This
was causing a problem because I build the grid dynamically and I have to
re-bind the dataset to the grid on the postback.

I have things working the way I need them too now.

Thanks.

"Elton Wang" wrote:

Why if you rebind data source you will loose the event
handler for the remove button?

Elton Wang
el********@hotmail.com

-----Original Message-----
Maybe I can simplify my explanation.

I need to capture the value entered into the textbox when

the user changes

it, but if the grid isn't re-bound on the postback, the

textbox that my

quantity is entered into doesn't exist and I can't handle

the event. On the

other hand, if I do re-bind on the postback, I loose the

event handler for

the remove button.

Currently, I handle the remove button click (it's an

image button in a

template column of the grid) in the ItemCommand event of

the grid. Can I

handle the button as I would a regular button (ie.

capture the click event

instead of the itemcommand event) or would that event

handler be wiped out

just the same because it's within the grid? I'll try to

code this, but if

someone can shed some light on this so I don't stray too

far down the wrong

path, I'd appreciate it.

Thanks.

"mwhalen" wrote:

Hi,

I have a page that has a datagrid bound to a dataset. Items are added to the dataset at particular times (ie the click event of an item in a tree control) then bound to the grid. The grid has an image button in a Template column that is used to remove an item (dataset row). I can't re-bind the grid on the postback or I lose the event handler for the button. I also have a column that contains a textbox that I need to handle the TextChanged event, but because of not being able to bind on the postback, I lose the binding to the grid before I get to the event handler. How can I either prevent or work around this?

--
Thanks

.