Asynchronous Process inside a casperjs script for while loop

Question

I'm using a while loop to open a list of usernames from a csv file. For each username of these, I have to open a URL and dump the page into a file.

However, then casper.thenOpen always runs only one time. I understood from Asynchronous Process inside a javascript for loop that this is due to that it is an asynchronous process. I need to do the same for my code below:

casper.then(function(){
    stream = fs.open('usernames.csv', 'r');
    targetusername = stream.readLine();         
    i = 0;

    while(targetusername) {                 
        var url = "http://blablalb" + targetusername;       
        console.log("current url is " + url);

        casper.thenOpen(url, function() {
            console.log ("I am here");
            fs.write(targetusername,this.getTitle() + "\n",'w');        
            fs.write(targetusername,this.page.plainText,'a');       
        });

        targetusername = stream.readLine();
        i++;
    }

});

The casper.thenOpen always runs only one time, giving me this output:

current url is first_url
current url is second_url
current url is third_url
I am here

What I need is like this

current url is first_url
I am here
current url is second_url
I am here
current url is third_url
I am here

I'm pulling my hair out to get that while loop running correctly!

Answer 1

I could reach the exact output that I needed:

current url is first_url
I am here
current url is second_url
I am here
current url is third_url
I am here

using the repeat function, as follows:

casper.then(function(){
    stream = fs.open('usernames.csv', 'r');        

    casper.repeat(3, function() {

        targetusername = stream.readLine(); 
        var url = "http://blablalb" + targetusername;       
        console.log("current url is " + url);

        casper.thenOpen(url, function() {
            console.log ("I am here");
            fs.write(targetusername,this.getTitle() + "\n",'w');        
            fs.write(targetusername,this.page.plainText,'a');       
        });

    }

)});