CODEWITHSUNDEEP
javascriptasynchronouspromisebluebird
Diogo Barroso
Diogo Barroso

Reputation: 915

Wrapping async cycle in Promise

I'm trying to do something like:

console.log("start spinner!");
for (var i = 0; i < modules.length; ++i) {
     var filename = modules[i].filename;
     $.get('./views/templates/'+ filename ).done(function(data){
           modulesTemplates.push(data);  
           console.log(data);
      }).fail();
}

How do I do for having a callback or wrapping this whole cycle in a promise? I tried with bluebirdjs, something like:

Promise.all([ modulesTemplates ])
      .then(function(data){
           console.log(course.modulesTemplates);
           loadView('home.html');
           console.log("stop spinner!");
});

But it doesn't work. Am I missing something or is it a better way of doing this?

The sequence of the console.logs:

start spinner!
[]
stop spinner!
tempalte 1
template 2

Upvotes: 1

Views: 113

Answers (1)

Benjamin Gruenbaum
Benjamin Gruenbaum

Reputation: 276406

With bluebird, assuming the requests can be in flight at once, you can do something like:

console.log("Start Spinner");
Promise.map(modules, function(module){
    return $.get('./views/templates/' + module.filename);
}).then(function(modulesTemplates){
    // module template is a list of all the templates loaded here
    // this code will be reached after all are loaded, for example
    // modulesTemplates[0] is the first template.
    console.log("Stop Spinner");
});

Upvotes: 3

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