assert

if the specified expression is false, an errorMessage is shown in the red popup at the top right corner of the screen

expression	any	truthy value to assert the expression, falsy - if assertion fails
errorMessage	string	an error message that will be shown in the red popup

Example

gantt.attachEvent("onLoadEnd", function(){
   gantt.assert(gantt.getTaskCount(), "no data loaded");
});

dhtmlxGantt codebase uses gantt.assert to detect an invalid state of the component

Error display can be changed using the show_errors config.

Errors can be traced programmatically, using the onError event.

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