@frui.ts/datascreens
v1.0.0-rc.4
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Frui.ts base classes for data-oriented view models
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@frui.ts/datascreens
This package contains base classes for data-centric view models.
ListViewModel
FilteredListViewModel
DetailViewModel
ListViewModel
Base class for master lists in master-detail scenarios.
items
- read currently displayed data rows from here. You can also manually put the data there.currentPaging
- paging information related to the data initems
, usually used by a pager controlsetData([items, paging])
- use this function to setitems
andcurrentPaging
in one step.
Example
async loadData() {
const data = await this.someRepository.getSomeData();
this.setData(data);
}
// without async
loadData() {
return this.someRepository.getSomeData().then(this.setData);
}
FilteredListViewModel
This base class adds some filter-related logic on top of ListViewModel
:
pagingFilter
- bind paging and sorting UI to this observable propertyfilter
- bind filter UI controls to this observable propertyappliedFilter
- a snapshot offilter
that should be used for loading new dataapplyFilter()
- validates the currentfilter
and if valid, resets dirty flags on it and stores a snapshot intoappliedFilter
loadData()
- implement this function to load actual data based onpagingFilter
andappliedFilter
properties. Call this function when the user changes paging/sorting.applyFilterAndLoad()
- bind 'search / filter' UI button to this function. It callsapplyFilter()
andloadData()
.resetFilterValues(filter)
- implement this function so that it applies default values to the filter passed as an argument. Note that this function should not have any side effects.resetFilter()
- bind 'clear filter' UI button to this function. It callsresetFilterValues(filter)
andapplyFilter()
.resetFilterAndLoad()
- bind 'reset filter' UI button to this function. It callsresetFilter()
andloadData()
.
The reason for the two properties for a filter is that if a user changes a filter/search field without committing the filter by clicking a Load/Search button, changing the actual page should load the data with the original filter values, not the current work-in-progress one.
You don't need to initialize the filters manually. The constructor automatically creates default pagingFilter
and calls resetFilterValues(filter)
.
If needed, you can attach a validator to filter
in the constructor. There is no filter validation by default.
Example
<TextBox target="{vm.filter}" property="firstName" />
<button onClick="{vm.applyFilterAndLoad}">Load</button>
<button onClick="{vm.resetFilterAndLoad}">Reset</button>
<DataTable items="{vm.items}" />
<Pager itemsPerPage={vm.currentPaging.limit} totalItems={vm.currentPaging.totalItems}
activePage={Math.ceil(vm.currentPaging.offset / vm.currentPaging.limit) + 1} />
ContinuousListViewModel
This base class updates the logic of setData
to support appending the new data to the existing list of items.
TODO
DetailViewModel
Useful functionality
busyWatcher
- already initialized instance ofbusyWatcher
for long-running process indication. It is automatically picked when using the@watchBusy
decorator on class functions.loadDetail()
- implement this function and return the detail entity for the view model. It is automatically called during view model initialize stage, and the returned value is assigned to theitem
propertyitem
- bind UI to this property containing the entity loaded byloadDetail()
setItem(item)
- call this helper function to manually setitem
later