onError

fires when assert receives 'false' value, i.e. when assertion fails

errorMessage

string

a string with an error from the assert method

boolean

defines whether the default action of the event will be triggered (true) or canceled (false)

Example

gantt.attachEvent("onError", function(errorMessage){
    gantt.message({
        text:"Error"
    });
    return true;
});

the event is blockable. Returning false will prevent the default behavior (showing error message in a red box in the top right)

added in version 4.0

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