Alert when filtered list returns zero records

[Ronald Anusiewicz]

I'm using a DBF file.
I have 2 UX components.
The first component calls the second which is an embedded UX component.
The second UX component has a control which is a filtered list.
The list is filtered on session variables and hard coding of selected fields in the record.

When pressing the button on the first UX, the code selects the Panel card containing the embedded UX with the filtered list.

If the list is empty, I would like to display a message stating so and stop the activation of the MY_LABOR_ENTRIES panel.

I've been trying examples I have found on this board without any luck.

This doesn't work.

var lObj = {dialog.object}.getControl('FIXENTRIES');
var count = lObj._state.recordCount;
alert(count);

var lObj = {dialog.object}.getControl('FIXENTRIES');
var count = lObj._rData.length;
alert(count);


if(count < 1){
	alert('There are No Entries Available for Editing.');  
} else {
	{dialog.object}.panelSetActive('MY_LABOR_ENTRIES',true);
}

Thanks for any help.

[-Jinx-]

Re: Alert when filtered list returns zero records

I'm not sure if you are using a client or server-side filter, but if it's server-side, in the list builder, on the data source tab, you could define a Server-side afterQuery event. Let's say you'd call it: AfterListQuery
The Xbasic for that event could look something like this:

function AfterListQuery as v (e as p)

if e.recordsInQuery < 1 then
	e.javascript = "alert('Your search retured 0 records.');"
else
	e.javascript = "{dialog.object}.panelSetActive('MY_LABOR_ENTRIES',true);"
end if

end function

I haven't tested it, but I use something similar and it works for me.

[Ronald Anusiewicz]

Re: Alert when filtered list returns zero records

I did find similar code on this board. I'm building the list against a DBF file. I don't see an afterQuery event anywhere. I don't believe that option is available for DBF tables. So I'm looking for another option.

Thank you.

[Davidk]

Re: Alert when filtered list returns zero records

You shouldn't be doing this server-side when you have everything you need client-side... which is what you're trying to do as in your first post.

What button gets pressed on the first UX? Is it in the List control? Is it separate from the FIXENTRIES List? Essentially, you don't want that button enabled if there are no records in FIXENTRIES... is that right?

Just ran a UX with a List control, DBF as data source. Your code works... both methods.

When you say if doesn't work... what does that mean? Are there errors being reported when you inspect the page? Put a debugger statement at the top of your code, fire up the UX in Chrome, Inspect the page, press the button, and walk through your code.

[Ronald Anusiewicz]

Re: Alert when filtered list returns zero records

Dave, at first glance, what you say makes a lot of sense. So then I thought all I would have to do is to use the list filter in the button's enable expression. I looked at the filter expression and realized that the list is being built on the server side. I do not have everything I need client side. Specifically, the fields POSTED and LOCKED are not used at all client side.

SITE = :argSite .AND. POSTED = .F. .AND. LOCKED <> .T. .AND. MECHANIC = :argMechanic

That's why I took my initial approach.

[Ronald Anusiewicz]

Re: Alert when filtered list returns zero records

I tried this code in the Javascript-click event for the button:

var lObj = {dialog.object}.getControl('FIXENTRIES');
var count = lObj._rData.length;
alert(count);

then I tried this:

var lObj = {dialog.object}.getControl('FIXENTRIES');
var count = lObj._state.recordCount;
alert(count);

and nothing happens. No Alert message, nothing.

Because I have security enabled, I have to test while running the UX components in a browser from the local webroot.
I don't think I can run a debug that way.

I think I need to do a text UX component and experiment with that.

Thanks.

[Davidk]

Re: Alert when filtered list returns zero records

Because you're running in a browser (Chrome and Firefox being the best for debugger) you are in the best place to debug Javascript. Firefox, with the Firebug plugin will give you buckets of information. Chrome I find a bit quicker for the simpler things. Run your UX in Chrome, with a debugger; statement in your code. Because you're not getting an alert I'd guess something's breaking. Are you sure your List control has a variable name of 'FIXENTRIES'?

Debugger will show any errors.

[Ronald Anusiewicz]

Re: Alert when filtered list returns zero records

David,

I built a test UX and I did get the code working. This is because the button is in the same UX component as the list.
So it appears that my real problem is:

1. the button is on the parent UX
2. the child UX has the list
3. the child UX is an Embedded Object, MechLbr_Edit, in the panel card: MY_LABOR_ENTRIES of the parent UX

List.JPG

So the code:

var lObj = {dialog.object}.getControl('FIXENTRIES');
var count = lObj._rData.length;

needs to be changes to reference the embedded UX.

Not sure how to code this.

[Davidk]

Re: Alert when filtered list returns zero records

I'm afraid you're still not making it very clear. You need to post info here about what is in the Parent UX and what is in the Child UX.

Where is FIXENTRIES?

If the List, FIXENTRIES, is in the Parent... and you're activating a PanelCard, MY_LABOR_ENTRIES, which is also in the Parent, then you do not necessarily need to reference the Child UX.

You're just counting the number of rows in FIXENTRIES and deciding to move to MY_LABOR_ENTRIES (which is in the Parent)... or not.

If FIXENTRIES is in the Child UX... then you do have to reference the Child... using {dialog.Object}.getChildObject(alias [,componentType]). Your Embedded UX must be given an Alias - it's one of the Embedded Object properties. Once you've set the alias you can do something like this...

var cObj = {dialog.Object}.getChildObject('myChildUXAlias');

Once you have a pointer to the Child UX... you can do this for FIXENTRIES...

var lObj = cObj.getControl('FIXENTRIES');

and then continue on with your count and test.

[Ronald Anusiewicz]

Re: Alert when filtered list returns zero records

David, thank you for your patience.

If FIXENTRIES is in the Child UX... then you do have to reference the Child... using {dialog.Object}.getChildObject(alias [,componentType]). Your Embedded UX must be given an Alias - it's one of the Embedded Object properties. Once you've set the alias you can do something like this...

var cObj = {dialog.Object}.getChildObject('myChildUXAlias');

Once you have a pointer to the Child UX... you can do this for FIXENTRIES...

var lObj = cObj.getControl('FIXENTRIES');
and then continue on with your count and test.

This is what I'm trying to do. My first mistake was the Alias. I got that straight. Now I'm getting an error when debugging the script.

var cObj = {dialog.Object}.getChildObject('OPEN_LBR');

var lObj = cObj.getControl('FIXENTRIES');

debug.JPG

I'm curious as I see that cObj = false in the debugger.
Could that be the problem?

[CharlesParker]

Re: Alert when filtered list returns zero records

Unless I am missing something, there is an option in the list control already to display a default message in the list control when there are no records to display...at least in ver 4 there is. I use it on every list. To stop the action, why not put the controls in a seperate panel card, limit the query to 5 results (or less) then hide the button if the record count is less than 1?
it seems like if you press the button, your going to make an ajax callback - retrieve the records and then run the code to determine if there should be an alert.
It might be "perceived faster" if you were loading the records first.
This would be in contrast to opening a seperate UX to do something with the records.

At least you would already know if the list was empty...

[Ronald Anusiewicz]

Re: Alert when filtered list returns zero records

First, thanks for your help. I finally figured most of this out. I'm using a session variable, True/False, for an enable expression on the button. This works fine.

What I can't seem to figure out is how to refresh the button when the enable expression session variable has been changed.

The button is on panel card A. When I go to panel card B or panel card C, I have code that changes the value of the session variable. When I return to Panel card A, the button is still in the same state as before. The session variable has indeed been changed, but the button needs to be refreshed.

How does one do this?

[CharlesParker]

Re: Alert when filtered list returns zero records

There really has to be a better way than using a session variable and changing it to change a button. I still really don't understand what you want exactly though. Client side seems like all you need though as far as I can tell.

[Ronald Anusiewicz]

Re: Alert when filtered list returns zero records

Charles,

I've been working with desktop apps since 1992. I'm in the habit of using variables and not knowing any better, I thought that this my be the way to go. I have since changed my approach, but now I'm having other issues.

http://www.alphasoftware.com/alphafo...esh-Panel-Card

Thanks for your help.