AppMaker - Navigate to Last Page on Table - google-app-maker

Question

Scenario:
I have a calculated SQL that returns 100 results.
Added a table (from this calculated SQL) and limited the size of the page by 25 results.
This will generate 4 pages.
Pager form AppMaker works well (navigates between pages) but i need a button that navigates directly from page 1 to the page 4.
is this possible?
Anyone got a solution for this?
Regards

Answer 1

If you need to know how many entries your table has (in your case it's seems fixed to 100, but maybe it could grow), you can still do what you want:
E.g. say your table on YOURPAGE depends on a datasource called Customers.
Create a new Data item called CustomerCount, with just one field, called Count (integer).
Its data source would be a sql query script:
Select count(CustomerName) as Count from Customers
on the page you are having the table on, add a custom property (say called
Count of type integer)
In the page attach event, set the property asynchronously with this custom action:
app.datasources.CustomerCount.load(function() {
app.pages.YOURPAGE.properties.Count = app.datasources.CustomerCount.count;
app.datasources.Customers.query.pageIndex = #properties.Count / 25;
app.datasources.Customers.datasource.load();
});
I tried similar things successfully in the past.

Answer 2

Found a solution for this:
ServerScript:
function CandidateCountRows() {
var query = app.models.candidate.newQuery();
var records = query.run();
console.log("Number of records: " + records.length);
return records.length;
}
in the button code:
var psize = widget.datasource.query.pageSize;
var pidx = widget.datasource.query.pageIndex;
var posicao = psize * pidx;
var nreg = posicao;
google.script.run.withSuccessHandler(function(Xresult) {
nreg = Xresult;
console.log('position: ' + posicao);
console.log('nreg: ' + nreg);
console.log('psize: ' + psize);
console.log('pidx: ' + pidx);
var i;
for (i = pidx; i < (nreg/psize); i++) {
widget.datasource.nextPage();
}
widget.datasource.selectIndex(1);
}).CandidateCountRows();
This will allow to navigate to last page.

Answer 3

If you know for a fact that your query always returns 100 records and that your page size will always be 25 records then the simplest approach is to make sure your button is tied to the same datasource and attach the following onClick event:
widget.datasource.query.pageIndex = 4;
widget.datasource.load();