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<title>Qt Quick Text Input Handling and Validators | QtQuick 5.2</title>
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<li>Qt 5.2</li>
<li><a href="qtquick-index.html">Qt Quick</a></li>
<li>Qt Quick Text Input Handling and Validators</li>
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Qt 5.2.1 Reference Documentation</li>
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<h3><a name="toc">Contents</a></h3>
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<li class="level1"><a href="#text-visual-types">Text Visual Types</a></li>
<li class="level1"><a href="#validating-input-text">Validating Input Text</a></li>
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<h1 class="title">Qt Quick Text Input Handling and Validators</h1>
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<a name="text-visual-types"></a>
<h2>Text Visual Types</h2>
<p>Qt Quick provides several types to display text onto the screen. The <a href="qml-qtquick-text.html">Text</a> type will display formatted text onto the screen, the <a href="qml-qtquick-textedit.html">TextEdit</a> type will place a multiline line edit onto the screen, and the <a href="qml-qtquick-textinput.html">TextInput</a> will place a single editable line field onto the screen.</p>
<p>To learn more about their specific features and properties, visit their respective documentation.</p>
<a name="validating-input-text"></a>
<h2>Validating Input Text</h2>
<p>The <i>validator</i> types enforce the type and format of <a href="qml-qtquick-textinput.html">TextInput</a> objects.</p>
<pre class="qml"><span class="type"><a href="qml-qtquick-column.html">Column</a></span> {
<span class="name">spacing</span>: <span class="number">10</span>
<span class="type"><a href="qml-qtquick-text.html">Text</a></span> {
<span class="name">text</span>: <span class="string">"Enter a value from 0 to 2000"</span>
}
<span class="type"><a href="qml-qtquick-textinput.html">TextInput</a></span> {
<span class="name">focus</span>: <span class="number">true</span>
<span class="name">validator</span>: <span class="name">IntValidator</span> { <span class="name">bottom</span>:<span class="number">0</span>; <span class="name">top</span>: <span class="number">2000</span>}
}
}</pre>
<p>The validator types bind to <tt>TextInput</tt>'s <tt>validator</tt> property.</p>
<pre class="qml"><span class="type"><a href="qml-qtquick-column.html">Column</a></span> {
<span class="name">spacing</span>: <span class="number">10</span>
<span class="type"><a href="qml-qtquick-text.html">Text</a></span> {
<span class="name">text</span>: <span class="string">"Which basket?"</span>
}
<span class="type"><a href="qml-qtquick-textinput.html">TextInput</a></span> {
<span class="name">focus</span>: <span class="number">true</span>
<span class="name">validator</span>: <span class="name">RegExpValidator</span> { <span class="name">regExp</span>: /fruit basket/ }
}
}</pre>
<p>The regular expression in the snippet will only allow the inputted text to be <tt>fruit basket</tt>.</p>
<p>Note that QML parses JavaScript regular expressions, while Qt's QRegExp class' regular expressions are based on Perl regular expressions.</p>
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