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beforeRemove

Description​

Fires after removing an item from a data collection

Usage​

beforeRemove: (removedItem: any) => boolean | void;

Parameters​

The callback of the event takes the following parameter:

  • removedItem - (required) the object of an item to remove

Returns​

Return false to block removing an item from a data collection; otherwise, true.

Example​

// initializing Diagram
const diagram = new dhx.Diagram("diagram_container", {
    type: "default"
});
// loading data
diagram.data.parse(data);

// attaching a handler to the event
diagram.events.on("beforeRemove", (newItem) => {
    console.log("beforeRemove "+ item);
    return true;
});