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describe('core - page.len()', function() {
dt.libs({
js: ['jquery', 'datatables'],
css: ['datatables']
});
function checkTableLength(pageLen, infoLength = pageLen, tableLength = pageLen) {
let table = $('#example').DataTable();
// check APIs knowledge of the table
expect(table.page.len()).toBe(pageLen);
expect(table.page.info().length).toBe(infoLength);
// check DOM for number of rows and the reported number of rows
expect($('#example tbody tr').length).toBe(tableLength);
expect(
parseInt(
$('div.dataTables_info')
.text()
.split(' ')[3]
)
).toBe(tableLength);
}
describe('Check the defaults', function() {
dt.html('basic');
it('Exists and is a function', function() {
let table = $('#example').DataTable();
expect(typeof table.page.len).toBe('function');
});
it('Getter returns an integer', function() {
let table = $('#example').DataTable();
expect(Number.isInteger(table.page.len())).toBe(true);
});
it('Setter returns an API instance', function() {
var table = $('#example').DataTable();
expect(table.page.len(5) instanceof $.fn.dataTable.Api).toBe(true);
});
});
describe('Check the getter behaviour', function() {
dt.html('basic');
it('Expected default length', function() {
let table = $('#example').DataTable();
checkTableLength(10);
});
dt.html('basic');
it('Page lengthcan be set to 1 during initialisation', function() {
let table = $('#example').DataTable({
pageLength: 1
});
checkTableLength(1);
});
dt.html('basic');
it('Page lengthcan be set to 5 during initialisation', function() {
let table = $('#example').DataTable({
pageLength: 5
});
checkTableLength(5);
});
dt.html('basic');
it('Page lengthcan be set to 10 during initialisation', function() {
let table = $('#example').DataTable({
pageLength: 10
});
checkTableLength(10);
});
dt.html('basic');
it('Ensure page length greater than the number of records', function() {
let table = $('#example').DataTable({
pageLength: 100
});
checkTableLength(100, 100, 57);
});
dt.html('basic');
it('Ensure setting page length to be -1 during initialisation shows all', function() {
let table = $('#example').DataTable({
pageLength: -1
});
checkTableLength(-1, -1, 57);
});
});
describe('Check the setter behaviour', function() {
dt.html('basic');
it('Page length in the DOM does not change before the draw', function() {
$('#example')
.DataTable()
.page.len(15);
checkTableLength(15, 15, 10);
});
it('Page length can be set to 1 through the API', function() {
$('#example')
.DataTable()
.page.len(1)
.draw();
checkTableLength(1);
});
it('Page lengthcan be set to 5 through the API', function() {
$('#example')
.DataTable()
.page.len(5)
.draw();
checkTableLength(5);
});
it('Page lengthcan be set to 10 through the API', function() {
$('#example')
.DataTable()
.page.len(10)
.draw();
checkTableLength(10);
});
it('Ensure page length greater than the number of records', function() {
$('#example')
.DataTable()
.page.len(100)
.draw();
checkTableLength(100, 100, 57);
});
it('Ensure setting page length to be -1 through the API shows all', function() {
$('#example')
.DataTable()
.page.len(-1)
.draw();
checkTableLength(-1, -1, 57);
});
});
describe('Advanced behaviour', function() {
dt.html('basic');
it('Has no effect if paging disabled at initialisation', function() {
let table = $('#example').DataTable({ paging: false });
table.page.len(15);
checkTableLength(15, -1, 57);
});
});
});
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