assert

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

expression	boolean	true to assert the expression, false - if assertion fails
errorMessage	string	an error message that will be shown in a red popup

Example

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

dhtmlxScheduler codebase uses scheduler.assert() to detect an invalid state of the component.

An error display can be changed using the show_errors config.

Errors can be traced programmatically, using the onError event.

added in v6.0

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