session variable trap

[cFlat7]

Re: session variable trap

It was my pleasure.

BTW, I was speaking with another Alpha developer about this issue today and he thought we might be able to use the OnRowRender client event to initialize the ID from the Javascript side of things (i.e from the Javascript global variable approach we discussed earlier in this thread), and avoid the call-back to set the session variable. The only proviso is that you would need to check the row number and make sure it was < 0 before doing the setValue(), as row numbers for new records in the grid are negative. I.e. :

var rowNum = {grid.Object}._selectedRow;
if (rowNum < 0) {
// put the setValue() initializing code here...
}

We haven't tested this out but we think it should work.

[cFlat7]

Re: session variable trap

*deleted by author*

[marcPCA]

Re: session variable trap

Vaughn,

i was reading this older post and it is very clear what your telling. I have a simular situation except i only need the session var on child grid.
So it looks to me i have a timing issue (it looks like when i wait long enough the correct session var is available). You mentioned in this thread there is a way to overcome this. Can you pls point me in the good direction?

[cFlat7]

Re: session variable trap

Yes, Alpha recently added a new feature that makes this quite easy. Have a look at video #M41 here:

http://news.alphasoftware.com/v11preview/videos_v11.htm

[marcPCA]

Re: session variable trap

I noticed that but sadly enough i need it vor v10.5 (i think it is a good improvement)
It looks like they don't have a timing problem anymore? But in 10.5 with the ajax callback i have a tim ing problem. I set the session var and check with a log file (like your example) and it is set everytime correct. But when i want to use it on a childgrid (new record) it is not always there. Sometimes it is fast sometimes not. Don't know why. i think the timing problem. I don't know how to speed up the session var to be available for the childgrid or just disable the new record functionality until the session var is available (with the correct value)

[cFlat7]

Re: session variable trap

Marc,

In version 10.5, the only sure-fire way I know of is the following (forgive me if I'm repeating from a previous post):

1. In the parent grid, create two buttons, one of them will do the call back to set the session variable. The other button will call your child grid; also, make this button hidden (so your user only sees the button that does the Ajax callback).

2. In the Xbasic of the Ajax callback that sets the session variable, have it send back a Javascript command to click the hidden button that will call your child grid. For example:


myXBasicFunction = "{Grid.ComponentName}_BUTTONS_CALLCHILDHIDDEN.onClick();"

...where the name of your button (as per the button definition) is after _BUTTONS_, in this example the button is called CALLCHILDHIDDEN (and the Xbasic function is called myXBasicFunction).

This way the child grid does not get called until after the callback has completed, ensuring that the session var has been set before the child gets access to it.

One thing else to watch out for, and that is that when the child grid is rendered it takes a "snapshot" of the value of any session vars it is using the first time the child grid is opened. To avoid that, so the child grid sees the changed value of the session var, in the parent grid make sure that the "Use Cached Grid" property is clicked off (in the Action script dialog for calling the child grid).

I hope this helps,
Vaughn

[marcPCA]

Re: session variable trap

Hi Vaughn,

thanks for your help . It made a lot of things clearer to me (especially that it takes a 'snapshot' and the cache grid part). The only thing i can't get working is to 'push' the hidden button with the xbasic. maybe i have the name of the button wrong (just button 15) -I also tired the button label name-.
I end my XBasic function with: XB_set_Upload = "{Grid.ComponentName}_BUTTONS_UNBOUND_BUTTON_15.onClick();" but that doesn't seem to 'push' the hidden button. If i put in XB_set_upload = "alert('test screen ');" i get the message so the Xbasic funtion is executed.

[cFlat7]

Re: session variable trap

My example was using the Name property of an Action button. Is 'Button_15' the name you used in this property? I'm assuming you are putting the button in the tool bar in above/below the grid.

[marcPCA]

Re: session variable trap

I used a button on the detailview

[marcPCA]

Re: session variable trap

I use now: XB_set_uploadfolder = "ele=$('{Grid.ComponentName}.D.V.R1._UNBOUND_BUTTON_15');ele.click();"
that works partially. If i check it in live preview (or check that page in browser) button 15 is pushed at the end of the callback. So theoretically that should take care of my session vars timingproblems. So far thank you again for taking the time to show me how things work.
Strange thing is that if i check on localhost or live on the Inet button 15 is not pushed at the end of the callback.
So it looks like the java that is send to the browser is not good. Ionly wonder why it does work in live preview (and also under the browser)

[cFlat7]

Re: session variable trap

Marc, I'm not sure why that would not work in the browser. Perhaps others in the forum might have an idea.

p.s. It is too bad you can't use v.11. With the feature shown in video M41, you simply "register" any session variables you need in the Action script dialog for calling a grid. There is no timing issue as Alpha sets the session variables on the server before calling the child grid.

[cFlat7]

Re: session variable trap

One other thought... if you provide the link to the child grid from the grid (e.g. in an action button), instead of from the detail view the syntax I posted earlier should work.

[marcPCA]

Re: session variable trap

Hope i can switch to v11 soon but for now i have to solve this issue with v10.5
thanks for your help