如何确保一项任务仅在另一项任务结束后才发生

Question

Don't make it duplicate please. I am in middle of a big problem. I am working on a javascript code with thousands of lines of code. My problem is:

methodA is called from its own class.

methodA{  
    doSomething(abc, def, function(obj){  
        obj.getName();  
    });  
}  

doSomething(abc, def, callback){  
// codes....
callback(new XYZ());  
}

In XYZ class constructor I am using a couple of Jquery Deffered objects(with ajax calls). So my problem is at obj.getName() I am getting error that this.name is not defined. So how can I ensure that entire new XYZ() execution ends completely(all ajax calls, callbacks etc.) when the control comes to obj.getName() function ?

Thanks

Answer 1

You can use function call back for this purpose. more can be searched on google by jquery deferred As shown here

var jqDeferred = doSomething(abc,def,function(obj){

});

jqDeferred.done(function(){
obj.getName();  
})


doSomething(abc,def,callback)
{

}

Answer 2

you can use .when and .then => http://api.jquery.com/jquery.when/

methodA{  
    doSomething(abc, def, function(obj){  
        $.when(callback(new XYZ())).then(obj.getName());  
    });