function waitFor(testFx, onReady, timeOutMillis) {
    var maxtimeOutMillis = timeOutMillis ? timeOutMillis : 3001, //< Default Max Timeout is 3s
        start = new Date().getTime(),
        condition = false,
        interval = setInterval(function() {
            if (new Date().getTime() - start < maxtimeOutMillis && !condition) {
                // If not time-out yet and condition not yet fulfilled
                condition =
                    typeof testFx === 'string' ? eval(testFx) : testFx(); //< defensive code
            } else {
                if (!condition) {
                    // If condition still not fulfilled (timeout but condition is 'false')
                    console.log("'waitFor()' timeout");
                    phantom.exit(1);
                } else {
                    // Condition fulfilled (timeout and/or condition is 'true')
                    console.log(
                        "'waitFor()' finished in " +
                            (new Date().getTime() - start) +
                            'ms.'
                    );
                    typeof onReady === 'string' ? eval(onReady) : onReady(); //< Do what it's supposed to do once the condition is fulfilled
                    clearInterval(interval); //< Stop this interval
                }
            }
        }, 100); //< repeat check every 100ms
}
function waitFor(testFx, onReady, timeOutMillis) {
    var maxtimeOutMillis = timeOutMillis ? timeOutMillis : 3001, 
        start = new Date().getTime(),
        condition = false,
        interval = setInterval(function() {
            if (new Date().getTime() - start < maxtimeOutMillis && !condition) {
                
                condition =
                    typeof testFx === 'string' ? eval(testFx) : testFx(); 
            } else {
                if (!condition) {
                    
                    console.log("'waitFor()' timeout");
                    phantom.exit(1);
                } else {
                    
                    console.log(
                        "'waitFor()' finished in " +
                            (new Date().getTime() - start) +
                            'ms.'
                    );
                    typeof onReady === 'string' ? eval(onReady) : onReady(); 
                    clearInterval(interval); 
                }
            }
        }, 100); 
}
function waitFor ( testFx , onReady , timeOutMillis ) { var maxtimeOutMillis = timeOutMillis ? timeOutMillis : 3001 , //< Default Max Timeout is 3s start = new Date ( ) . getTime ( ) , condition = false , interval = setInterval ( function ( ) { if ( new Date ( ) . getTime ( ) - start < maxtimeOutMillis && ! condition ) { // If not time-out yet and condition not yet fulfilled condition = typeof testFx === 'string' ? eval ( testFx ) : testFx ( ) ; //< defensive code } else { if ( ! condition ) { // If condition still not fulfilled (timeout but condition is 'false') console . log ( "'waitFor()' timeout" ) ; phantom . exit ( 1 ) ; } else { // Condition fulfilled (timeout and/or condition is 'true') console . log ( "'waitFor()' finished in " + ( new Date ( ) . getTime ( ) - start ) + 'ms.' ) ; typeof onReady === 'string' ? eval ( onReady ) : onReady ( ) ; //< Do what it's supposed to do once the condition is fulfilled clearInterval ( interval ) ; //< Stop this interval } } } , 100 ) ; //< repeat check every 100ms }
Wait until the test condition is true or a timeout occurs. Useful for waiting
on a server response or for a ui change (fadeIn, etc.) to occur.

@param testFx javascript condition that evaluates to a boolean,
it can be passed in as a string (e.g.: "1 == 1" or "$('#bar').is(':visible')" or
as a callback function.
@param onReady what to do when testFx condition is fulfilled,
it can be passed in as a string (e.g.: "1 == 1" or "$('#bar').is(':visible')" or
as a callback function.
@param timeOutMillis the max amount of time to wait. If not specified, 3 sec is used.
Wait until the test condition is true or a timeout occurs . Useful for waiting on a server response or for a ui change ( fadeIn etc . ) to occur .