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beforeShow

fires before a control is shown

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

Parameters:

value: string - the current value of the control

Returns:

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

Example

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

Change log:

added in v7.0