How to set current item in App Maker datasource?

Question

This seems basic but I can\'t seem to figure out how to manually set the current item to work with from the datasource?

To illustrate: I have a table and I notice th

Answer 1

Why it happens:

AM code: generate button click event
User code: handle button's click event
User code: navigate user to different page
AM code: destroy DOM of current page
AM code: build DOM for new page
-- dead code after this line
AM code: row click event handler
AM code: change datasource's current item

Row's click event handler never gets control, because row is destroyed by user's code.

What Morfinismo's solution does?

AM code: generate button click event
User code: handle button's click event
AM code: row click event handler
AM code: change datasource's current item
-- moved lines
User code: navigate user to different page
AM code: destroy DOM of current page
AM code: build DOM for new page

Here are more tech details: Event Loop

In App Maker this problem can be solved with

1. setTimeout
2. Force current item update in user code

// button's onClick event handler
app.datasource.ListDatasource.selectKey(widget.datasource.item._key);

3. CustomProperties

// button's onClick event handler
app.pages.ShowMeNext.properties.Key = widget.datasource.item._key;
app.showPage(app.pages.ShowMeNext);

// next page's onAttach event handler
app.datasources.RecordDatasource.filters._key._equals = app.currentPage.properties.Key;
app.datasources.RecordDatasource.load();

4. URL parameters and history - this approach is used in most template apps, because it also implements deep linking on some extent.

// button's onClick event handler
var params = {
               key: widget.datasource.item._key
             };
var page = app.pages.ShowMeNext;
app.showPage(page);
google.script.history.replace(null, params, page.name);

// next page's onAttach event handler
google.script.url.getLocation(function(location) {
  app.datasources.RecordDatasource.filters._key._equals = location.parameters.key;
});

5. Passing value between pages using global scope

// button's onClick event handler
window.key = widget.datasource.item._key;

// next page's onAttach event handler
app.datasources.RecordDatasource.filters._key._equals = window.key;

ListDatasource - list/grid/table datasource

RecordDatasource - datasource dedicated for a specific record (single-record datasource)