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Promise returns undefined

in Using jQuery • 6 years ago

Hey there,

I'm struggeling with a function of mine and I dont' quite know why, as this method seems to have worked so far for other functions. Basically I'm getting Objects from a SharePoint List and return all the Values in common. Somehow in my returned variable my "Result" is always undefined. When I make a breakpoint at the deferred.resolve() result is correctly defined but somehow it doesnt get out. Maybe someone has an idea where I'm doing it wrong.

I also tried the resolve in a seperate chained done. Still the same behaviour though :(

Thanks in advance and

Greetings Chris

}, getFilteredListMultiple: function(ListName, AndOrFilter){
var deferred = new $.Deferred();
var result;
var andFilteredLists = [];
$(AndOrFilter).each(function(index){
andFilteredLists[index] = aceSpListLookup.list.getFilteredList(ListName, this);
})
$.when.apply(null, andFilteredLists).done(function(){
result = andFilteredLists[0].Result.responseJSON.d.results;
for(i=0; i<andFilteredLists.length-1; i++){
result = customGeneralFunctions.elementsInCommon(result,andFilteredLists[i+1].Result.responseJSON.d.results);
}
deferred.resolve();
});
return deferred.promise({Result: result});
}
}

Replies(3)

alfred_hi..

Re: Promise returns undefined

6 years ago

Ok I have a fix for the problem, even though it is not quite a satisfying one, because I can't really explain why this now works and my old code doesn't. So if anyone has an idea, I'd still appreciate some explanation what I did wrong. Anyways now my working code looks like this

getFilteredListMultiple: function(ListName, AndOrFilter){
var deferred = new $.Deferred();
var result = [];
var andFilteredLists = [];
var returned =[];
$(AndOrFilter).each(function(index){
andFilteredLists[index] = aceSpListLookup.list.getFilteredList(ListName, this);
})
$.when.apply($, andFilteredLists).done(function(){
result = andFilteredLists[0].Result.responseJSON.d.results;
for(i=1; i<andFilteredLists.length; i++){
$(andFilteredLists[i].Result.responseJSON.d.results).each(function(){
result.push(this);
});
}
}).done(function(){
$(result).each(function(index){
returned[index] = this;
});
deferred.resolve();
});
return deferred.promise({Result: returned});
}
}

So basically I added another array, that gets filled with the exact same values and return that one. Unfortunately I can't really explain why that worked and the previous code wouldn't. Maybe you guys have an idea. Thanks again and

Greetings Chris

watusiware

Re: Promise returns undefined

6 years ago

Hard to help from isolated code snippets. It's better to make a complete example that we can try, using jsFiddle or Plunkr. Too many things to guess about code not shown.

alfred_hi..

Re: Promise returns undefined

6 years ago

I'm afraid without a SharePoint-Environment the jsFiddle wouldn't do much. I was hoping to people with experience with the deferred my mistake would hopefully be pretty obvious. Still a pretty challenging topic for me.

Thanks for the quick reply though.

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Promise returns undefined

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