onBeforeUpdate

fires before sending data for item update

id	id	the old ID of the related item
details	object	the object which holds the state of data saving

Example

dp.attachEvent("onBeforeUpdate", function(id, details){
    //... some code here ... 
});

1 . The id parameter contains old client-side item ID.

2 . The details parameter contains data saving details, e.g.:

• data - data item object;
• id - old (clientside) ID;
• operation - the type of operation ("update").

Note that returning false from the event handler will suppress request to the server:

const processor = webix.dp("$datatable1");
  processor.attachEvent("onBeforeUpdate", () => {
    // cancel server request
    return false;
  })

Related sample:  DataProcessor: Canceling Server Request

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