before... events

You can use the before... top-level events to block processing if the event occurs and a given condition is not satisfied. Do this by passing in a function with an options parameter and setting the success property of this options parameter to false.

The pattern is:

$.udb(datasource).on( event, function(evt, options) {

if ( condition-not-satisfied ) {

options.success = false;

alert( message );

}

});

For example:

$.udb("PRODUCT").on( "beforeexecutequery", function(evt, options) {

if ( this.searchCols("PRODUCT_TYPE").val() == "" ) {

options.success = false;

alert( "To query, you must specify a product type." );

}

});