DataCollection overview
A set of APIs that allow you to work with data of a component. Applicable to Chart, Combobox, DataView, Grid, List.
Methods
| Name | Description |
|---|---|
| add() | adds a new item to the component |
| changeId() | changes the id of an element of a data collection |
| copy() | creates a copy of an item at the defined position |
| exists() | checks whether the specified item exists in the component |
| filter() | filters data items in a component |
| find() | finds the item that corresponds to the specified rule |
| findAll() | finds all the items that correspond to the specified rule |
| forEach() | iterates over all items of a data collection |
| getId() | returns the id of the item by its index |
| getIndex() | returns the index of the item by its id |
| getInitialData() | returns the initial values of the items of a widget initialized in a data collection |
| getItem() | returns the object of an item by its id |
| getLength() | returns the number of all elements of a data collection |
| isDataLoaded() | checks whether the specified data range is loaded from the server |
| isSaved() | checks whether the changes made in a data collection are saved |
| load() | loads data from an external file |
| map() | iterates through all items of the component |
| mapRange() | returns a new array of the items correspond to the specified parameters |
| move() | moves an item to the defined position |
| parse() | loads data from a local data source |
| reduce() | reduces the array to a single value |
| remove() | deletes the specified item from the component |
| removeAll() | deletes all items from the component |
| save() | saves changes made in a data collection to the server side |
| serialize() | serializes the component data into JSON, XML or CSV format |
| sort() | sorts data items in a component |
| update() | updates properties of the item |
Events
| Name | Description |
|---|---|
| afterAdd | fires after adding a new item into a data collection |
| afterLazyLoad | fires after getting a response from the server |
| afterRemove | Fires after removing an item from a data collection |
| beforeAdd | fires before adding a new item into a data collection |
| beforeLazyLoad | fires before sending a request to the server |
| beforeRemove | fires before removing an item from a data collection |
| change | fires when a data collection is modified |
| load | fires when items are loaded in a data collection |
| loadError | fires when loading of data fails |
| removeAll | fires when all items are removed from a data collection |
Ways of applying events
To call the event of DataCollection, you may use either of the two syntaxes:
- common syntax (via the data object of the component)
chart.data.events.on("afterAdd", function(newItem){
console.log("A new item is added");
});
- or short syntax (right through the component)
chart.events.on("afterAdd", function(newItem){
console.log("A new item is added");
});