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

void assert(any expression,string errorMessage);
expressionanytruthy value to assert the expression, falsy - if assertion fails
errorMessagestringan error message that will be shown in the red popup


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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