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Breadcrumbs go here --> <li>QML Text Handling and Validators</li> </ul> </div> <div class="toolbuttons toolblock"> <ul> <li id="smallA" class="t_button">A</li> <li id="medA" class="t_button active">A</li> <li id="bigA" class="t_button">A</li> <li id="print" class="t_button"><a href="javascript:this.print();"> <span>Print</span></a></li> </ul> </div> </div> <div class="content mainContent"> <link rel="prev" href="mouseevents.html" /> <link rel="next" href="qdeclarativefocus.html" /> <p class="naviNextPrevious headerNavi"> <a class="prevPage" href="mouseevents.html">Mouse Events</a> <a class="nextPage" href="qdeclarativefocus.html">Keyboard Focus</a> </p><p/> <div class="toc"> <h3><a name="toc">Contents</a></h3> <ul> <li class="level1"><a href="#text-elements">Text Elements</a></li> <li class="level1"><a href="#validators">Validators</a></li> <li class="level1"><a href="#displaying-text-in-qml">Displaying Text in QML</a></li> <li class="level1"><a href="#validating-input-text">Validating Input Text</a></li> </ul> </div> <h1 class="title">QML Text Handling and Validators</h1> <span class="subtitle"></span> <!-- $$$texthandling.html-description --> <div class="descr"> <a name="details"></a> <a name="text-elements"></a> <h2>Text Elements</h2> <ul> <li><a href="qml-text.html">Text</a></li> <li><a href="qml-textinput.html">TextInput</a></li> <li><a href="qml-textedit.html">TextEdit</a></li> </ul> <a name="validators"></a> <h2>Validators</h2> <ul> <li><a href="qml-intvalidator.html">IntValidator</a></li> <li><a href="qml-doublevalidator.html">DoubleValidator</a></li> <li><a href="qml-regexpvalidator.html">RegExpValidator</a></li> </ul> <a name="displaying-text-in-qml"></a> <h2>Displaying Text in QML</h2> <p>QML provides several elements to display text onto the screen. The <a href="qml-text.html">Text</a> element will display formatted text onto the screen, the <a href="qml-textedit.html">TextEdit</a> element will place a multiline line edit onto the screen, and the <a href="qml-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 element documentation.</p> <a name="validating-input-text"></a> <h2>Validating Input Text</h2> <p>The <a href="#validators">validator</a> elements enforce the type and format of <a href="qml-textinput.html">TextInput</a> objects.</p> <pre class="qml"> <span class="type"><a href="qml-column.html">Column</a></span> { <span class="name">spacing</span>: <span class="number">10</span> <span class="type"><a href="qml-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-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 elements bind to <tt>TextInput</tt>'s <tt>validator</tt> property.</p> <pre class="qml"> <span class="type"><a href="qml-column.html">Column</a></span> { <span class="name">spacing</span>: <span class="number">10</span> <span class="type"><a href="qml-text.html">Text</a></span> { <span class="name">text</span>: <span class="string">"Which basket?"</span> } <span class="type"><a href="qml-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 <a href="qregexp.html">QRegExp</a> class' regular expressions are based on Perl regular expressions.</p> </div> <!-- @@@texthandling.html --> <p class="naviNextPrevious footerNavi"> <a class="prevPage" href="mouseevents.html">Mouse Events</a> <a class="nextPage" href="qdeclarativefocus.html">Keyboard Focus</a> </p> </div> </div> </div> <div class="ft"> <span></span> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2013 Digia Plc and/or its subsidiaries. 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