register dynamic javacript with RegisterStartupScript

[Jason Chan]

I have a paging datalist which show a list of thumbnail.

Above the datalist there is a dropdown to jump to different paging.
On Page_load, I bind the datalist according to the current page.
On the same time, I have to generate a dynamic javascript to load the image
in the datalist to an javascript array

So I use Page.RegisterStartupScript to insert the script just before the
closing form tag.

The code works fine for the first page, however when I jump to another page,
from the source code, I found that the JavaScript keep showing the script of
the first page. This make my page doesn't work properly

That is, for example.

page 1 of datalist load 5 images (1.jpg, 2.jpg, 3.jpg, 4.jpg, 5.jpg)
the javascript of the page 1 is dynamic generated and registered
img[0] = "1.jpg";img[1] = "2.jpg";img[2] = "3.jpg";img[3] = "4.jpg";img[4] =
"5.jpg";

when I jump to page 2, it load another 5 images (6.jpg, 7.jpg, 8.jpg, 9.jpg,
10.jpg)
the javascript should look like
img[0] = "6.jpg";img[1] = "7.jpg";img[2] = "8.jpg";img[3] = "9.jpg";img[4] =
"10.jpg";

However, it just keep showing the first script, any idea?
P.S using ASP.NET 2.0

 

[cbDevelopment]

Without seeing any code, it is not possible to determine the exact cause,
but this is my theory:

In your page_load you have something similar to:

If not ispostback then
GetPage(1)
DoDataBinding()
end if

GenerateJavascript()

And you have in a paging handler:
GetPage(e.NewPageIndex)
DoDataBinding()

On first load of the page, the page load will load the first page of data
and bind the data, then will create the javascript for your page.

On subsequent postbacks, the page load will run first, creating the
javascript for the first page, then the event handler will fire, which
loads the next page and binds it to the datalist.

If this is the correct scenario, you will need to call the method that
creates the javascript in your event handler so it is current with the
data that has been loaded. The base problem I suspect is that you have
your javascript generate call in the page load which is fired before the
new page data is loaded.

Hope this helps.

----
700cb Development, Inc.
http://www.700cb.net
..NET utilities, developer tools,
and enterprise solutions

I have a paging datalist which show a list of thumbnail.

Above the datalist there is a dropdown to jump to different paging.
On Page_load, I bind the datalist according to the current page.
On the same time, I have to generate a dynamic javascript to load the
image in the datalist to an javascript array

So I use Page.RegisterStartupScript to insert the script just before
the closing form tag.

The code works fine for the first page, however when I jump to another
page, from the source code, I found that the JavaScript keep showing
the script of the first page. This make my page doesn't work properly

That is, for example.

page 1 of datalist load 5 images (1.jpg, 2.jpg, 3.jpg, 4.jpg, 5.jpg)
the javascript of the page 1 is dynamic generated and registered
img[0] = "1.jpg";img[1] = "2.jpg";img[2] = "3.jpg";img[3] =
"4.jpg";img[4] = "5.jpg";

when I jump to page 2, it load another 5 images (6.jpg, 7.jpg, 8.jpg,
9.jpg, 10.jpg)
the javascript should look like
img[0] = "6.jpg";img[1] = "7.jpg";img[2] = "8.jpg";img[3] =
"9.jpg";img[4] = "10.jpg";

However, it just keep showing the first script, any idea?
P.S using ASP.NET 2.0

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