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beforeShow

fires before a control is shown

beforeShow: (value: string | number) => boolean | void;

Parameters:

  • value: string | number - the current value of the control

Returns:

Return false to prevent a control from being shown; otherwise, true.

Example

form.getItem("text").events.on("beforeShow", function(value) {
    console.log("beforeShow", value);
    return true;
});

Change log:

added in v7.0