Qt Quick Text Input Handling and Validators | Qt Quick | Qt 6.12.0
Description: Text input and validation

- Qt 6.12
- Qt Quick
- Important Concepts In Qt Quick - User Input
- Qt Quick Text Input Handling and Validators
- Qt 6.12.0 Reference Documentation

Mouse Events ◦ Qt Quick Input Handlers

# Qt Quick Text Input Handling and Validators

## Text Visual Types

Qt Quick provides several types to display text onto the screen. The Text type will display formatted text onto the screen, the TextEdit type will place a multiline line edit onto the screen, and the TextInput will place a single editable line field onto the screen.

To learn more about their specific features and properties, visit their respective documentation.

## Validating Input Text

The validator types enforce the type and format of TextInput objects.

DoubleValidator | Defines a validator for non-integer numbers
IntValidator | Defines a validator for integer values
RegularExpressionValidator | Provides a string validator

     Column {
         spacing: 10

         Text {
             text: "Enter a value from 0 to 2000"
         }
         TextInput {
             focus: true
             validator: IntValidator { bottom:0; top: 2000}
         }
     }

The validator types bind to `TextInput`'s `validator` property.

     Column {
         spacing: 10

         Text {
             text: "Which basket?"
         }
         TextInput {
             focus: true
             validator: RegularExpressionValidator { regularExpression: /fruit basket/ }
         }
     }

The regular expression in the snippet will only allow the inputted text to be `fruit basket`.

Note that QML parses JavaScript regular expressions, while Qt's QRegularExpression class' regular expressions are based on Perl regular expressions.

Mouse Events ◦ Qt Quick Input Handlers