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JavaScript DataCollection - beforeAdd Event

fires before adding a new item into a data collection

beforeAdd: (newItem: object) => boolean | void;

• newItem: object - the object of an added item

Return false to prevent an item adding into a data collection; otherwise, true.

Example

component.data.events.on("beforeAdd", function(newItem){
    console.log("A new item will be added");
    return true;
});

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