CasperJS waitForSelector doesn't add "then" to step array

Question

This is how my code looks like:

var firstFrameLoadingTime = 3000;

firstFrameLoadingWaiter(function() {
    casper.echo("callback");
});

function firstFrameLoadingWaiter(callback) {
    casper.waitForSelector('div',
        function suc() {
            casper.echo('success!');
        },
        function timeout() {        
                casper.echo('failure!');
        },
        firstFrameLoadingTime);
}

The problem is that suc function is never called. I mean it's not added to the array of CasperJS steps.

This is a part of the log:

[18] => [info] [phantom] Step _step 5/5 https://... (HTTP 200)
[19] => [info] [phantom] Step _step 5/5: done in 3392ms.
[20] => [info] [phantom] waitFor() finished in 40ms.
[21] => [info] [phantom] Done 5 steps in 3451ms

If selector isn't found on a page before timeout comes script works like a charm.

UPD. As it turned out the problem was in do_while and waitFor incompatibility.

Answer 1

After some time of research I found out that the problem was in do_while modification of step.then function. do_while was incompatible with the waitFor function.

The workaround (pull request) is simple though not the clearest. I've just named the function in a special way and added a small check:

var isWaitSuccessFun = step.name.indexOf('successThen') != -1;
if( isWaitSuccessFun || !this.steps[this.current].executed ) {

To make your waitFor work just ensure the success function name contains successThen as in example:

casper.waitFor(
    function check(){
        // check if page is ready
    },
    function successThen(){
        // execute after page is ready
    },
    function(){
        // time out happened before page got ready
    },
    timeOutTime
);

This also makes waitForSelector work as well as other similar functions based on waitFor.

The full code is available in my forked repository.