Phonegap sync not keeping synced data

[John_Titor]

Hi,

I have a disconnected phonegap app that has a list of record, it has a sync button.

Often (not always) when the button is pressed it sync and show the correct data. But then when you close the app and open it again it still has the data pre-sync and you need to sync again.

Has anyone ever experienced something like that?


Code in the button itself:

{dialog.object}.saveListEdits('EVENTS',{rows: 'allRows'});
{grid.object}.runAction('Refresh Events');

Code in Refresh Events:

var lObj = {dialog.object}.getControl('EVENTS');
if(lObj) { 
if(lObj.listIsDirty()) { 
alert('Cannot refresh List because it has unsynchronized edits.');
} else { 
var options = {
	keepFocusOnCurrentSelection: true,
	setFocusToValue: '',
	refreshDependentLists: true,
	onlyRefreshDependentLists: false
};
{dialog.object}.refreshListData('EVENTS',options);
}
};

[Davidk]

Re: Phonegap sync not keeping synced data

First... change {grid.object} to {dialog.Object}. {grid.object} works... but is one of those embedded Alpha holes you may fall into one day if Alpha ever decides to clean up code... plus... it just looks bad.

What may be going on is this. You execute .saveListEdits()... which starts communication with the server. Then you immediately fire off a process that starts messing with the List... while the sync is going on. That sync takes time... you don't know when it's complete... or if it does complete.

What's the purpose of performing a .refreshListData()? Is it to get data that others may have added to the server... and you want to show in your List?

Also, you don't specify how you have set the Synchronization Policy for your List. You also don't say which Alpha version/build you're working with.

As a test, separate the two processes. Have a sync button... and a separate refresh button. Let the sync happen... then close and reopen your app. How is the data? Then Refresh the List. How is your data? It may be a bug... or it may be a timing issue you've introduced.

[CharlesParker]

Re: Phonegap sync not keeping synced data

My money is on the timing, it is astounding how much a blink in time can work in our favor!

[John_Titor]

Re: Phonegap sync not keeping synced data

First... change {grid.object} to {dialog.Object}. {grid.object} works... but is one of those embedded Alpha holes you may fall into one day if Alpha ever decides to clean up code... plus... it just looks bad.

What may be going on is this. You execute .saveListEdits()... which starts communication with the server. Then you immediately fire off a process that starts messing with the List... while the sync is going on. That sync takes time... you don't know when it's complete... or if it does complete.

What's the purpose of performing a .refreshListData()? Is it to get data that others may have added to the server... and you want to show in your List?

Also, you don't specify how you have set the Synchronization Policy for your List. You also don't say which Alpha version/build you're working with.

As a test, separate the two processes. Have a sync button... and a separate refresh button. Let the sync happen... then close and reopen your app. How is the data? Then Refresh the List. How is your data? It may be a bug... or it may be a timing issue you've introduced.

Hey,

Ok thanks for the ideas, I split the buttons now, new data is uploaded to the table from an external event at the end of every day. I will test how the seperate buttons work in a few hours.

The app is meant to be disconnected at during most of the day, then at the end of the day, it should sync back the changes made to the records on the device and add new records that was added to the table during the day.

I am on build 4584, Version 12.4.5.0

In the Sync Policy in the LIST properties, I checked both of the Client-to-server and Server-to-client check boxes.

I will do test during the day and report back soon. Thanks so much for your help.

[jgrannis]

Re: Phonegap sync not keeping synced data

In the Sync Policy in the LIST properties, I checked both of the Client-to-server and Server-to-client check boxes.

I believe that if you checked the Server-to-client box then you don't need to run your action 'Refresh Events' at all.
I think you are probably running a double, full refreshListData() every time you do the saveListEdits().

If it is a big list, I might just uncheck the Server-to-client box, keep your action 'Refresh Events' but change it to an incremental refresh. In that case, I don't believe that you even have to test if the list is dirty or not because the incremental refresh will not automatically overwrite the dirty rows with data from the server.

[Davidk]

Re: Phonegap sync not keeping synced data

I'd suggest you re-read the details in the Synchronization Policy dialog. If you're offline most of the day... why bother trying to run a Client-to-Server sync... and then a Server-to-Client sync... every time you save data to the List? That just doesn't make any sense. And... there's a really big warning about Server-to-Client syncs... so I'd heed that one.

Look at the code you posted... and the Sync policy you have set up. You save data changes to your List. Then, because of the Sync policy Alpha automatically tries to sync those List changes to the server. And then you're running a manual .refreshListData()... at the same time Alpha is trying to perform a Server-to-Client sync.

You've created a giant mess of callbacks. And who knows what Alpha is actually trying to do with all that. Yikes.

You should turn off both sync policies and look after syncing yourself... then you may know what's going on when.

You're one full release behind, although I'm never sure if that's a good position or bad... both most likely.