Promises? about sharepointplus

[Aymkdn]

Hi,

I'll use jQuery Deferred as an example (because it's cross-browser). We can call 2 different lists and once they are done we can proceed with the results from both lists:

$.when( 
  (function() {
    var deferred = jQuery.Deferred();

    $SP().list("My List 1").get({fields:"Title"}, function(data) {
      var res=[];
      if (data.length === 0) deferred.reject("Nothing found for My List 1");
      else {
         for (var i=data.length; i--;) res.push(data[i].getAttribute("Title"))
         deferred.resolve(res);
      }
    })

    return deferred;
  }()),
  (function() {
    var deferred = jQuery.Deferred();

    $SP().list("My List 2").get({fields:"Title"}, function(data) {
      var res=[];
      if (data.length === 0) deferred.reject("Nothing found for My List 2");
      else {
         for (var i=data.length; i--;) res.push(data[i].getAttribute("Title"))
         deferred.resolve(res);
      }
    })

    return deferred;
  }())
).done(function(list1, list2) {
  console.log(list1, list2);
}).fail(function(err) {
  alert("Error: " + err);
});

I hope it makes sense.

[slhilbert]

Thanks for the reply. I think most of my issues stem from just a general jQuery understanding, but I do appreciate you taking the time to help me. This example doesn't quite do what I want. I want to call one Sharepoint list, then using that list's data, then make a second call to sharepoint for more info.

Does that make sense?

Thanks,
Stuart

[Aymkdn]

Sorry, I'm not sure to understand.... It's async, so you either use Promise:

$.when( 
  (function() {
    var deferred = jQuery.Deferred();

    $SP().list("First List").get({
      fields:"Title",
      groupby:"Title",
      view: "Platform"
    }, function getData(data) {
      if (data.length===0) deferred.reject("No Data");
      else {
        var Platform = GetUnique(data); // --> Platform = ['ABC', 'DEF', 'GHI']
        deferred.resolve(Platform);
      }
    });
    return deferred;
  }())
).done(function(Platform) {
  // create a WHERE clause based on the result
  var where = [];
  for (var i=0; i<Platform.length; i++) where.push("Platform = '" + Platform[i] + "'")
  // we suppose we have less than 15 items into the "where" array
  where = where.join(" OR "); // --> where = "Platform = 'ABC' OR Platform = 'DEF' OR Platform = 'GHI'"
  // call the second list using the data from the first one
  $SP().list("Second List").get({fields:"ID", where:where}, function(data) {
    // something else here
  })
}).fail(function(err) {
  alert("Error: " + err);
});

or you call the second list in the callback directly :

$SP().list("First List").get({
  fields:"Title",
  groupby:"Title",
  view: "Platform"
}, function getData(data) {
  // create a WHERE clause based on the result
  var Platform = GetUnique(data); // --> Platform = ['ABC', 'DEF', 'GHI']
  var where = [];
  for (var i=0; i<Platform.length; i++) where.push("Platform = '" + Platform[i] + "'")
  // we suppose we have less than 15 items into the "where" array
  where = where.join(" OR "); // --> where = "Platform = 'ABC' OR Platform = 'DEF' OR Platform = 'GHI'"
  // call the second list using the data from the first one
  $SP().list("Second List").get({fields:"ID", where:where}, function(data) {
    // something else here
  })
});