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JavaScript Form - beforeChange Combo Box Event

fires before changing the value of a control

beforeChange: (ids: (string | number) | (string | number)[]) => boolean | void;

• ids: string | number | (string | number)[] - the ID(s) of newly selected option(s) from data collection

Return false to prevent changing the value of the control; otherwise, true.

Example

form.getItem("combo").events.on("beforeChange", function(ids) {
    console.log("beforeChange", ids);
    return true;
});

Change log: The event was added in v8.0

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