NonVisualTable - simple tutorial

[mlohbihler]

Hi Mone,

The getNewValue method works when i call it with a 1-based index, but not when i try to use the field name (e.g. "price", "time", "type", etc). Is there a way to get LS to recognize the field name instead?

Best regards,
Matthew

[Mone]

Hi,

to let the web client recognize the item and field names just follow approach 2 as explained.
Check approach2.html in the zip file to see the complete source code.

[mlohbihler]

Thanks, but i tried that, and never got any data. In my DataAdapter i am calling the smart update with a Map object as the fields, and using field names such as "value", "time", "type", and "index". But in the JS the method calls getNewValue(1), and getNewValue("1") work (as as well for other indices), but the calls getNewValue("value"), getNewValue("time"), etc do not.

I had assumed that leaving out the field names was maybe some kind of bandwidth performance setting. Might this be the case or am i doing something wrong?

Best regards,
Matthew

[Mone]

Hi,

Are you using your own MetadataProvider or a given one (LiteralBasedProvider or similar is needed)?
Have you created your table using as schema an array of field names?

About bandwidth note that item/field names never go through the stream.


PS: I noticed that this tutorial use the loadEngineMinimal method. Please upgrade to the new createEngine method as loadEngineMinimal is a deprecated method (I will update this tutorial as soon as possible)
PPS: Updated!

[mlohbihler]

Hi Mone,

Yes, i created my own MetadataProvider. How would that affect things?

I create by table thus:
var newTable = new NonVisualTable("test6", "value time index", "DISTINCT");

Thanks,
Matthew

[Mone]

There are two conditions to let you access data with item/field names:

1. You must create the Table object using as group/schema an array of strings. Each string should be the name of an item/field.
   The web client will concatenate the strings using a space as separator.
2. The getItems /getSchema method of the MetadataProvider implementation must split the received id/schema on the space character and handle each token as an item/field name.
   This is the behavior of the LiteralBasedProvider.

You should create your table as below:
var newTable = new NonVisualTable(new Array("test6"), new Array("value","time","index"), "DISTINCT");

[mlohbihler]

Hurray! Thanks Mone, that works much better.