angular promise - angularjs chain http post sequentially -

-

in application, storing data in local storage , trigger async http post in background. once posted, posted data gets removed local storage. when http post in process, there may more data added local storage need queue post , sequentially process because, need wait local storage cleared successful posts. task should called recursively until there data in local storage. 

taskqueue: function () {     var deferred = $q.defer();     queue.push(deferred);     var promise = deferred.promise;      if (!saveinprogress) {       // post data storage       var promises = queue.map(function(){$http.post(<post url>, <post data>).then(function(result){           // clear successful data           deferred.resolve(result);       }, function(error){          deferred.reject(error);       })     })      return $q.all(promises); }

as angular newbie, having problems above code not being sequential. how can achieve intend to? queue length unknown , queue length increases process in progress. please point me other answers if duplicate.

async.js sounds idea if don't want use library ...

$q.all batch array of requests , fire them @ same time , resolve when promises in array resolve - not want.

to make $http calls sequentially array ....

var request0 = $http.get('/my/path0'); var request1 = $http.post('/my/path1', {data:'fred'}); var request2 = $http.get('/my/path2'); var requestarray = [];

then ...

requestarray.push(request0); requestarray.push(request1); requestarray.push(request2);

then ...

requestarray[0].then(function(response0) {     // response0     return requestarray[1]; }).then(function(response1) {     // response1     return requestarray[2]; }).then(function(response2) {     // response2 }).catch(function(failedresponse) {     console.log("i displayed when request fails (if ever)", failedresponse) });

Comments

Post a Comment

Popular posts from this blog

c# - How Configure Devart dotConnect for SQLite Code First? -

-
can configure following sample code ? when run following code, error : no entity framework provider found ado.net provider invariant name 'devart.data.sqlite' setting in machine.config <system.data> <dbproviderfactories> <add name="dotconnect sqlite" invariant="devart.data.sqlite" description="devart dotconnect sqlite" type="devart.data.sqlite.sqliteproviderfactory, devart.data.sqlite, version=4.6.287.0, culture=neutral, publickeytoken=09af7300eec23701" /> </dbproviderfactories> </system.data> after add below block code in app.config <?xml version="1.0"?> <configuration>   <configsections> <!-- more information on entity framework configuration, visit http://go.microsoft.com/fwlink/?linkid=237468 --> <section name="entityframework" type="system.data.entity.internal.configfile.entityframeworksection, entit...
Read more

java - Copying object fields -

-
what best way of copying classes when need have 2 independent variables? have simple class: public class myclass { boolean = false; string b= "not empty"; } do need make method : assign(myclass data ) { a= data.a; b= data.b; } is there automatic method copy (duplicate) objects in java? do need make method : pretty close. instead of making method, should make constructor. such constructors called copy constructor , , create them this: myclass(myclass data) { = data.a; b = data.b; } and create copy of instance, use constructor this: myclass obj1 = new myclass(); myclass obj2 = new myclass(obj1); copy constructor can tedious : using copy constructor create deep-copy can tedious, when class has mutable fields. in case, assignment create copy of reference, , not object itself. have create copy of fields (if want deep copy). can go recursive. a better way create deep copy serialize , deserialize object. why not use clone()? ...
Read more

c++ - Clear the memory after returning a vector in a function -

-
i have function processes , stores lot of data in , returns results vector of class. amount of data stored in function tremendous , want clear storage memory of function after finished job. necessary (does function automatically clear memory) or should clear memory function? update: vector<customers> process(char* const *filename, vector<int> id) { vector<customers> list_of_customers; (perform actions) return list_of_customers; } variables defined locally within function automatically released @ end of function scope. destructors objects called, should free memory allocated objects (if objects coded correctly). example of such object std::vector . anything you've allocated new must have corresponding delete release storage. try avoid doing own allocation , use raii instead, i.e. containers or smart pointers.
Read more