Passing parameters to a screen.

Question

I am using the following code:
myapp.Dataset1.SomeItem_ItemTap_execute = function (screen) {
myapp.showSomeScreen({
beforeShown: function (objScreen) {
objScreen.CurrentTask = screen.Task.selectedItem;
objScreen.TaskFiles = screen.Task.selectedItem.TaskFiles;
When I clicked on an item to open the screen.  I was not getting the files. The reason was the TaskFiles were not loaded. Then I went to the query definition of the Tasks and under ManageIncludedData, I made the TaskFiles (Included). At that point it
started to work. But since I can have many "Task" items in that page. I do not want to load all the files for every single item.
Looking to solve the problem I used promises like this:
myapp.Dataset1.SomeItem_ItemTap_execute = function (screen) {
myapp.showSomeScreen({
beforeShown: function (objScreen) {
screen.Task.selectedItem.TaskFiles.getTaskDefinitionFiles().then(function () {
objScreen.CurrentTask = screen.Task.selectedItem;
objScreen.TaskFiles = screen.Task.selectedItem.TaskFiles;
Then I went to the query definition of the Tasks and under ManageIncludedData, I made the TaskFiles (Excluded) again. It did not work!
I kind of know why did not work... but I do not know what is the right way to do it in this case. I need to wait for the result of the promise call before showing the screen and I am not sure how to do that.
Any help would be greatly appreciated.

Answer 1

I kind of know why did not work... but I do not know what is the right way to do it in this case.
I need to wait for the result of the promise call before showing the screen
and I am not sure how to do that.
I think you're getting very close.  You have waited for the the result of the promise by placing the code in the
.then() function, but you also need to pass the promise result as an object to the .then() function.  Usually the promise returns with an object having a property
results containing an array of your data.  It ought to look something like this:
myapp.Dataset1.SomeItem_ItemTap_execute = function (screen) {
myapp.showSomeScreen({
beforeShown: function (objScreen) {
screen.Task.selectedItem.TaskFiles.getTaskDefinitionFiles().then(function (taskFiles) {
console.log(taskFiles); objScreen.CurrentTask = screen.Task.selectedItem;
objScreen.TaskFiles = taskFiles.results;
It can help to log taskFiles to console to inspect its properties to see if it's correct.