Pre-processing data, loaded from an external data source

Webix JS
1

Is it possible to validate data, received from an external data source, priort to sending this data to control?

I’d like to catch all “Load()” requests in web-app, and validate returned data.
In case of request processing errors, return from web-server error messages and display these messages on a web-client side.

2

a) you can use code like next

It will catch any server side error ( response with error status code )

webix.attachEvent("onAjaxError", function(xhr){
       alert("Error "+xhr.responseText);
})

b) you can extend the default data loading logic

var base = webix.DataDriver.xml.toObject();
webix.DataDriver.xml.toObject = function(text, response){
 //any custom logic
 return base.call(this, text, response);
}

above code allows to add a custom logic that will be triggered before parsing any incoming data.

3

Option (B) is great, exactly the solution I’m looking for, but I could not make it working.

Included (B) in head section of the page. http://webix.com/snippet/fea47bf9

Issues so far:

  1. The code triggers when Data is loaded, but does not recognize Configuration load events.

  2. Line 8, “return base.call(this, text, response);”, generates an error instead of passing through the xml data.

4

(1)

DataDriver code will be called for any DATA loading call. It means if you are using it with load command of any component - it will be triggered. As for configuration it will work if you are using webix.markup.parse with XML string, it will not work if you are using parse with XML object ( as there will not be a toObject call in that case )

If you mean some other scenario - please share details.

(2)

Yep, sorry it was my typo, in first line it must be just a function name .toObject; , not function call .toObject()

http://webix.com/snippet/ab024e6c

5

Thank you for the fix.

Yes, I use webix.markup.parse and trigger works.