Archived:How to restrict input to a QLineEdit using a validator

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Qt Quick should be used for all UI development on mobile devices. The approach described in this article (using C++ for the Qt app UI) is deprecated.

This code snippet how to use validation filter to restrict the input into a QLineEdit using a "validator". There are a number of different validation filters including QIntValidator, QDoubleValidator, QRegExpValidator, and you can create your own as well.

Article Metadata

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Tested with

Devices(s): Emulator / desktop / device

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Compatibility

Platform(s): All Qt Supported

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Article

Keywords: QLineEdit

Created: skumar_rao (25 Nov 2010)

Last edited: hamishwillee (11 Oct 2012)

QLineEdit *le = new QLineEdit(this);
le->setValidator(new QIntValidator(this));